JP6558701B2 - Flying organism detection device - Google Patents

Description

  The present invention relates to a flying organism detection apparatus.

  Patent Document 1 describes a flying creature detection device for detecting flying creatures. This flying organism detection device includes a light projecting unit that emits light and a light receiving unit that detects the amount of light emitted from the light projecting unit. When the flying organism crosses the light emitted from the light projecting unit, the light is blocked by the flying organism, and the amount of light detected by the light receiving unit decreases. The flying creature detection device detects flying creatures based on a decrease in the amount of light detected by the light receiving unit.

JP 2000-209998 A

  However, in the flying organism detection apparatus described in Patent Document 1, it is necessary to always irradiate light from the light projecting unit while detecting flying organisms, and the power consumption is large. In order to reduce power consumption, for example, it is conceivable to use natural light instead of light emitted from the light projecting unit. However, when natural light is used, the external light environment (the amount of natural light) changes, and thus flying creatures may be erroneously detected due to changes in the external light environment.

  Therefore, an object of the present invention is to provide a flying organism detection apparatus capable of detecting flying organisms with high accuracy.

  The present invention is a flying organism detection device for detecting flying organisms, comprising: a rod-shaped member; a first light receiving unit that is provided at the tip of the rod-shaped member and detects the amount of light incident on the tip of the rod-shaped member; A light-shielding member that surrounds one light-receiving portion along the circumferential direction of the outer peripheral surface of the rod-shaped member, and a bar-shaped member provided at an intermediate position that is a predetermined length away from the first light-receiving portion toward the base end of the rod-shaped member. Based on the second light receiving unit for detecting the amount of light incident on the intermediate position, the first detection value detected by the first light receiving unit and the second detection value detected by the second light receiving unit, A determination unit that determines whether or not the flying creature is stationary at the tip of the rod-shaped member.

  This flying organism detection apparatus includes a first light receiving unit and a second light receiving unit, and does not include a light projecting unit that emits light. That is, flying creatures are detected by detecting the amount of natural light by the first light receiving unit and the second light receiving unit. As described above, the flying organism detection apparatus is configured to use natural light and does not use a light projecting unit that irradiates light, and thus can reduce power consumption compared to a case where a light projecting unit is provided. The first light receiving unit detects the amount of light incident on the tip of the rod-shaped member, and the second light receiving unit detects the amount of light incident on the intermediate position of the rod-shaped member. When the flying creature stops at the tip of the rod-shaped member, the natural light incident on the tip of the rod-shaped member is blocked by the flying creature, and the first detection value of the first light receiving unit changes. That is, it is possible to determine whether the flying creature is stationary based on the first detection value. On the other hand, when the flying creature stops at the tip of the rod-shaped member, the natural light incident on the intermediate position is not blocked by the flying creature, so the second detection value of the second light receiving unit does not change. That is, the second light receiving unit detects the external light environment. The determination unit determines whether the flying creature is stationary at the tip of the rod-like member based on the first detection value that can determine the stationary state of the flying creature and the second detection value that represents the external light environment. judge. As a result, the flying creature detection device can detect flying creatures in consideration of changes in the external light environment, and can accurately detect flying creatures even when the external light environment changes.

  The flying organism detection device may further include a light transmission diffusion unit that surrounds the second light receiving unit and diffuses the transmitted light. Thereby, the natural light from the outside can be uniformly incident on the second light receiving unit, and the external light environment can be detected stably.

  The determination unit may determine whether or not the flying creature is stationary at the tip of the rod-shaped member based on a change in the ratio between the first detection value and the second detection value. Thereby, the flying organism detection device can easily detect the stationary state of the flying organism based on the change in the ratio between the first detection value and the second detection value.

  The ratio of the average value of the first detection value for a predetermined period and the average value of the second detection value for the predetermined period is Pe, and the ratio of the first detection value and the second detection value is Pt. Sometimes, the determination unit may determine that the flying creature has stopped at the tip of the rod-shaped member when Pt has changed beyond a predetermined value with respect to Pe. Thereby, even if there is a difference between the sensitivity of the first light receiving unit and the sensitivity of the second light receiving unit, it is possible to accurately detect flying creatures using Pe and Pt.

  The determination unit may determine that the flying creature has stopped at the tip of the rod-shaped member when the state in which Pt changes with respect to Pe and exceeds a predetermined value continues for a predetermined time or longer. As a result, for example, even if the natural light incident on the tip of the rod-like member is blocked for a moment by other objects (such as fallen leaves) other than the flying creature, it is erroneously assumed that the flying creature has stopped accidentally. It will never be detected.

  According to the present invention, flying creatures can be detected with high accuracy.

1 is an overall view showing a configuration of a flying organism detection system having a flying organism detection device according to the present embodiment. It is a figure which shows the flying organism detection apparatus of FIG. It is a conceptual diagram which shows the time-dependent change of the detected value detected by the 1st light-receiving part and the 2nd light-receiving part. It is a flowchart which shows the flow of the detection process of the flying organism performed by the determination part.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  FIG. 1 is an overall view showing a configuration of a flying organism detection system 100 having a flying organism detection device 10 according to the present embodiment. The flying organism detection system 100 automatically images the flying organism 20 such as a dragonfly. As shown in FIG. 1, the flying organism detection system 100 includes a flying organism detection device 10, an imaging device 30, and a fixing device 40.

  The flying creature detection device 10 detects the flying creature 20. FIG. 2 is a diagram illustrating the flying organism detection apparatus 10. As shown in FIG. 2, the flying organism detection apparatus 10 includes a rod-shaped member 11, a first light receiving unit 12, a second light receiving unit 13, a light blocking member 14, a light transmission diffusion unit 15, a cover 16, and a determination unit 17. It has.

  The rod-shaped member 11 is a cylindrical member, and has a size that makes it easy for the flying creature 20 to rest at the end of the rod-shaped member 11. The rod-shaped member 11 is formed of a material that can transmit light, such as transparent plastic and transparent acrylic.

  As shown in FIG. 1, the lower end portion of the rod-shaped member 11 is fixed by a fixing device 40 so that the rod-shaped member 11 extends along the vertical direction. In addition, the rod-shaped member 11 is not limited to extending along the vertical direction, and may be fixed in a state inclined by a predetermined angle with respect to the vertical direction. However, when the flying organism detection system 100 includes a plurality of flying organism detection devices 10 and the detection results are compared among the plurality of flying organism detection devices 10, the orientations of the rod-like members 11 are standardized in order to standardize the detection accuracy. And the direction of natural light. The imaging device 30 is a device that performs imaging based on an instruction from the determination unit 17, and is installed so that the upper end portion of the rod-shaped member 11 is in the imaging range.

  The first light receiving unit 12 is provided at the upper end (tip) of the rod-shaped member 11 and detects the amount of natural light incident on the upper end of the rod-shaped member 11. Specifically, the first light receiving portion 12 is provided inside the cylindrical shape at the upper end portion of the rod-shaped member 11, and the light detection surface faces the opening side of the upper end of the rod-shaped member 11.

  The first light receiving unit 12 is an optical sensor that detects the amount of light. In the present embodiment, a CdS cell that is an optical sensor using cadmium sulfide is used. The detection value (resistance value) of the Cds cell increases as the amount of incident light decreases. Hereinafter, the detection value of the first light receiving unit 12 is referred to as a first detection value.

  When the flying creature 20 stops at the upper end portion of the rod-shaped member 11, the amount of light incident on the upper end portion of the rod-shaped member 11 is reduced by being blocked by the flying creature 20. Accordingly, the first detection value of the first light receiving unit 12 increases in proportion to the decrease in the amount of incident light.

  The second light receiving portion 13 is provided at an intermediate position in the rod-shaped member 11 that is a predetermined distance away from the first light receiving portion 12 toward the lower end portion (base end portion) of the rod-shaped member 11. The second light receiving unit 13 detects the amount of light incident on the intermediate position of the rod-shaped member 11. In the rod-shaped member 11, a position away from the first light receiving portion 12 toward the lower end portion of the rod-shaped member 11 by a predetermined length is referred to as an intermediate position of the rod-shaped member 11. That is, the second light receiving unit 13 is provided at an intermediate position of the rod-shaped member 11.

  Similar to the first light receiving unit 12, the second light receiving unit 13 is provided inside the cylinder at an intermediate position of the rod-shaped member 11. The second light receiving unit 13 detects the amount of natural light incident on the intermediate position of the rod-shaped member 11. In the present embodiment, the second light receiving unit 13 uses a Cds cell that is the same optical sensor as the first light receiving unit 12. Hereinafter, the detection value of the second light receiving unit 13 is referred to as a second detection value.

  Here, when the rod-shaped member 11 is installed in a standing state, the flying creature 20 has a property of being stopped (stopped) at the upper end portion of the rod-shaped member 11 with respect to the intermediate position of the rod-shaped member 11. For this reason, the change in the second detection value detected by the second light receiving unit 13 follows the change in the external light environment. That is, when the external light environment does not change, the second detection value of the second light receiving unit 13 does not change.

  The second light receiving unit 13 is intended to detect an external light environment around the first light receiving unit 12. For this reason, it is preferable that the second light receiving unit 13 is provided at a position close to the first light receiving unit 12. In other words, the intermediate position where the second light receiving unit 13 is provided is preferably a position close to the first light receiving unit 12. However, the intermediate position is at least from the upper end portion of the rod-shaped member 11 so that the second detection value of the second light receiving unit 13 is not affected by the flying organism 20 stationary at the upper end of the rod-shaped member 11. The position is about a distance away.

  FIG. 3 is a conceptual diagram showing a change with time of detection values detected by the first light receiving unit 12 and the second light receiving unit 13 as an example. The horizontal axis represents time, and the vertical axis represents the resistance value. Vm is a first detection value of the first light receiving unit 12 (resistance value of the first light receiving unit 12), and Vr is a second detection value of the second light receiving unit 13 (resistance value of the second light receiving unit 13). ). When the flying creature 20 is not stationary at the upper end of the rod-shaped member 11 (time t1 to t2), the first detection value Vm and the second detection value Vr do not change. The first detection value Vm and the second detection value Vr are, for example, individual differences in sensitivity between the first light receiving unit 12 and the second light receiving unit 13, the light shielding member 14, and the light transmission diffusion unit 15. Values differ from each other depending on the presence or absence.

  When the flying creature 20 stops at the upper end of the rod-shaped member 11 (after time t2), the light incident on the first light receiving unit 12 is blocked by the flying creature 20, and the first detection value Vm is reduced by reducing the light amount. To rise. On the other hand, since the amount of light incident on the intermediate position of the rod-shaped member 11 does not change, the second detection value Vr does not change with time.

  As shown in FIG. 2, the light shielding member 14 surrounds the first light receiving unit 12 along the circumferential direction of the outer peripheral surface of the rod-shaped member 11. That is, the light shielding member 14 does not cover the upper end of the rod-shaped member 11. The light shielding member 14 blocks light incident from the outer peripheral surface of the rod-shaped member 11 toward the inside at the upper end portion of the rod-shaped member 11. The light shielding member 14 may be configured by, for example, a black tape having a light shielding property attached to the outer peripheral surface of the rod-shaped member 11. As a result, the first light receiving unit 12 detects light incident on the inside of the bar-shaped member 11 from the opening at the upper end of the bar-shaped member 11. The light blocking member 14 is incident on the first light receiving unit 12 when the flying creature 20 is stationary by blocking light incident from the outer peripheral surface of the rod-shaped member 11 toward the inside (light from the lateral direction). If it can reduce sufficiently, the material and the arrangement | positioning method will not be specifically limited. Further, a light shielding member 18 may be provided between the first light receiving unit 12 and the second light receiving unit 13, preferably just below the first light receiving unit 12. The light blocking member 18 blocks light incident on the second light receiving unit 13 provided inside the rod member 11 from the opening at the upper end of the rod member 11. As a result, the second light receiving unit 13 can detect only light that enters the rod-shaped member 11 from the outer peripheral surface of the rod-shaped member 11. The material and arrangement of the light shielding member 18 are not particularly limited as long as the light shielding member 18 can block light incident on the second light receiving unit 13 provided inside the rod member 11 from the opening at the upper end of the rod member 11. .

  The light transmission diffusion unit 15 surrounds the second light receiving unit 13 and diffuses the transmitted light. Specifically, the light transmission diffusion part 15 covers the outer peripheral surface of the rod-shaped member 11 so as to surround the second light receiving part 13 and the vicinity thereof. The light transmissive diffusing unit 15 diffuses light incident from the outside of the rod-shaped member 11 toward the second light receiving unit 13. The light transmissive diffusing unit 15 diffuses light so that natural light from the outside is uniformly incident on the second light receiving unit 13. Accordingly, the second light receiving unit 13 can stably detect the external light environment. As the light transmission diffusion part 15, for example, frosted glass, a white tape having a predetermined transmittance, or the like can be used.

  The cover 16 covers the opening at the upper end of the rod-shaped member 11. The cover 16 is transparent, and the same material as that of the rod-shaped member 11 can be used. When the flying creature 20 is not stationary at the upper end of the rod-shaped member 11, the light passes through the cover 16 and is detected by the first light receiving unit 12. Note that the cover 16 may have a function of diffusing light in the same manner as the light transmission diffusion portion 15 in order to allow light to uniformly enter the first light receiving portion 12 from the opening at the upper end of the rod-shaped member 11. . Alternatively, apart from the cover 16, a light transmissive diffusion member for allowing light to uniformly enter the first light receiving unit 12 may be provided on the top of the first light receiving unit 12.

  The determination unit 17 is electrically connected to the first light receiving unit 12 and the second light receiving unit 13. A signal line that connects the determination unit 17 to the first light receiving unit 12 and the second light receiving unit 13 passes through the inside of the rod-shaped member 11. The determination unit 17 is a computer including a calculation unit such as a CPU (Central Processing Unit), a storage unit such as a ROM (Read Only Memory), a RAM (Random Access Memory), and an HDD (Hard Disk Drive). Note that the determination unit 17 may not include an HDD. The determination unit 17 can process signals input from the first light receiving unit 12 and the second light receiving unit 13 and transmit a signal to the imaging device 30 based on the result. Note that the determination unit 17 may be a computer that operates with the power of a dry battery that generates a voltage of about 5 V, for example.

  Based on the change in the ratio between the first detection value detected by the first light receiving unit 12 and the second detection value detected by the second light receiving unit 13, the determination unit 17 It is determined whether or not the upper end of the rod-shaped member 11 is stationary. Specifically, the determination unit 17 obtains the first detection value Vm of the first light receiving unit 12 and the second detection value Vr of the second light receiving unit 13 every predetermined time (for example, every second). It acquires, and whenever it acquires these detection values, it is determined whether the flying creature 20 is resting on the upper end part of the rod-shaped member 11 or not.

  In order to perform this determination, when the determination unit 17 acquires the first detection value Vm and the second detection value Vr, the ratio (Vm / Vr) between the first detection value Vm and the second detection value Vr. Is calculated. Hereinafter, this ratio (Vm / Vr) is referred to as an instantaneous ratio Pt. When the instantaneous ratio Pt is calculated, the determination unit 17 determines whether or not the instantaneous ratio Pt exceeds the determination value Y. When the instantaneous ratio Pt exceeds the determination value Y, the determination unit 17 determines that there is a possibility that the flying creature 20 is stationary at the upper end portion of the rod-shaped member 11. Further, the determination unit 17 determines that the flying creature 20 has stopped at the upper end portion of the rod-shaped member 11 when the state in which the instantaneous ratio Pt exceeds the determination value Y continues for a predetermined time (for example, 10 seconds) or longer. Thus, when the state in which the instantaneous ratio Pt exceeds the determination value Y continues for a predetermined time or longer, the natural light incident on the upper end portion of the rod-shaped member 11 due to falling leaves or the like is determined by determining that the flying creature 20 is stationary. It is possible to prevent the flying creature 20 from being erroneously determined to be stationary when it is interrupted for a moment.

  Further, the determination unit 17 instructs the imaging device 30 to perform imaging when the duration of the state in which the instantaneous ratio Pt exceeds the determination value Y reaches a predetermined time (for example, 10 seconds). In other words, even if the state in which the instantaneous ratio Pt exceeds the determination value Y continues beyond the predetermined time, the determination unit 17 once when the duration of the state in which the instantaneous ratio Pt exceeds the determination value Y reaches the predetermined time. Only the imaging apparatus 30 is instructed to perform imaging.

  Further, the determination unit 17 determines whether the flying creature 20 is stationary using the instantaneous ratio Pt, and calculates a determination value Y used for the determination. Specifically, first, the determination unit 17 determines the average value of the first detection values Vm acquired from the present to a predetermined period Te (for example, 300 seconds) and the present to the predetermined period Te. The ratio (average value of the first detection value Vm / average value of the second detection value Vr) with the average value of the second detection value Vr acquired in step S is calculated. Hereinafter, this ratio (average value of the first detection value Vm / average value of the second detection value Vr) is referred to as an average ratio Pe.

  The determination unit 17 calculates a determination value Y by multiplying the average ratio Pe by a predetermined coefficient (for example, 1.05). The determination unit 17 uses a preset value as a predetermined coefficient. The determination unit 17 calculates the average ratio Pe and calculates the determination value Y every time the first detection value Vm and the second detection value Vr are acquired. However, the determination unit 17 stops the calculation of the determination value Y after the instantaneous ratio Pt exceeds the determination value Y, and restarts the calculation of the determination value Y when the instantaneous ratio Pt becomes equal to or less than the determination value Y. That is, after the instantaneous ratio Pt exceeds the determination value Y, the determination unit 17 uses the determination value Y when it is determined that the instantaneous ratio Pt exceeds the determination value Y, and uses the first detection value Vm and the second detection value Vm. Each time the detected value Vr is acquired, the instantaneous ratio Pt is compared with the determination value Y. Then, when the instantaneous ratio Pt becomes equal to or smaller than the determination value Y, the determination unit 17 calculates the determination value Y every time the first detection value Vm and the second detection value Vr are acquired, and determines the instantaneous ratio Pt. Comparison with the value Y is performed.

  Here, the determination value Y is calculated by multiplying the average ratio Pe by a predetermined coefficient. For this reason, the case where the instantaneous ratio Pt exceeds the determination value Y can be said to be a case where the instantaneous ratio Pt changes beyond the predetermined value with respect to the average ratio Pe. For example, when the predetermined coefficient is 1.05, the case where the instantaneous ratio Pt exceeds the determination value Y can be said to be the case where the instantaneous ratio Pt exceeds the average ratio Pe by more than 5%. The determination value Y is not limited to being calculated by multiplying the average ratio Pe by a predetermined coefficient. If it can be determined whether or not the instantaneous ratio Pt has changed beyond a predetermined value with respect to the average ratio Pe, for example, it may be calculated by adding a predetermined value to the average ratio Pe.

  Next, the flow of detection of flying creatures 20 performed by the determination unit 17 will be described using the flowchart of FIG. The flowchart shown in FIG. 4 is repeatedly executed every predetermined time (for example, every second). As shown in FIG. 4, the determination unit 17 acquires a first detection value Vm and a second detection value Vr from the first light receiving unit 12 and the second light receiving unit 13, respectively (S101). The determination unit 17 calculates the instantaneous ratio Pt based on the acquired first detection value Vm and second detection value Vr (S102).

  The determination unit 17 determines whether or not the instantaneous ratio Pt exceeds the determination value Y (S103). When the instantaneous ratio Pt exceeds the determination value Y (S103: YES), the determination unit 17 determines whether the duration of the state where the instantaneous ratio Pt exceeds the determination value Y has reached a predetermined time (S104). . The determination unit 17 determines that the flying creature 20 has stopped at the upper end portion of the rod-shaped member 11 when the state in which the instantaneous ratio Pt exceeds the determination value Y continues for a predetermined time (for example, 10 seconds) or longer. It is determined that the flying creature 20 is not stationary when it has not continued for more than the time. When the duration of the state where the instantaneous ratio Pt exceeds the determination value Y is a predetermined time (S104: YES), the determination unit 17 instructs the imaging device 30 to perform imaging. After the imaging instruction, the determination unit 17 ends the current flow, and starts processing from the start again after a predetermined time.

  When the instantaneous ratio Pt does not exceed the determination value Y (S103: NO), the determination unit 17 determines the first detection value Vm and the second detection value Vr acquired from the present to the predetermined period Te. Is used to calculate the average ratio Pe (S106). Note that there may be a case where the predetermined period Te for calculating the average ratio Pe has not elapsed, such as immediately after the start of the detection process of the flying creatures 20. In this case, the determination unit 17 calculates the average ratio Pe based on the first detection value Vm and the second detection value Vr acquired so far, even if the predetermined period Te has not elapsed. May be. Or the determination part 17 may complete | finish this flow, without performing determination by S103 until predetermined period Te passes and average ratio Pe is calculated correctly.

  Note that the first detection value Vm used when calculating the average ratio Pe is a detection value detected by the first light receiving unit 12 in a state where the flying creature 20 is not stationary at the upper end of the rod-shaped member 11. . For this reason, for example, immediately after the start of the detection process of the flying organism 20, the flying organism 20 is stationary at the upper end of the rod-like member 11 until the average ratio Pe is correctly calculated after a lapse of a predetermined period Te from the start of detection. It is preferable not to do so.

  The determination unit 17 calculates a determination value Y by multiplying the calculated average ratio Pe by a predetermined coefficient (for example, 1.05) (S107). After the determination value Y is calculated, the determination unit 17 ends the current flow. The determination value Y calculated here is used as the latest determination value for the determination process in S103 in the next flow.

  If the duration of the state in which the instantaneous ratio Pt exceeds the determination value Y is not the predetermined time (S104: NO), the determination unit 17 ends the current flow. Here, when the duration of the state in which the instantaneous ratio Pt exceeds the determination value Y is not the predetermined time, the duration of the state in which the instantaneous ratio Pt exceeds the determination value Y exceeds the predetermined time, and the flight When it is determined that the creature 20 is stationary on the rod-shaped member 11, and when the duration of the state where the instantaneous ratio Pt exceeds the judgment value Y is less than a predetermined time, it is determined that the flying creature 20 is not stationary. And if it is included.

  The present embodiment is configured as described above, and the flying organism detection apparatus 10 includes the first light receiving unit 12 and the second light receiving unit 13 and does not include a light projecting unit that emits light. That is, the flying creature 20 is detected by detecting the amount of natural light by the first light receiving unit 12 and the second light receiving unit 13. Thus, since the flying organism detection apparatus 10 is a structure using natural light and does not use a light projecting unit that irradiates light, power consumption can be reduced compared to a case where a light projecting unit is provided.

  The first light receiving unit 12 detects the amount of light incident on the upper end of the rod-shaped member 11, and the second light receiving unit 13 detects the amount of light incident on the intermediate position of the rod-shaped member 11. When the flying creature 20 stops at the upper end of the rod-shaped member 11, the natural light incident on the upper end of the rod-shaped member 11 is blocked by the flying creature 20, and the first detection value of the first light receiving unit 12 changes. That is, the stationary state of the flying creature 20 can be determined based on the first detection value. On the other hand, when the flying creature 20 stops at the upper end of the rod-shaped member 11, the natural light incident on the intermediate position is not blocked by the flying creature 20, so the second detection value of the second light receiving unit 13 does not change. That is, the second light receiving unit 13 detects an external light environment. The determination unit 17 stops the flying creature 20 at the upper end of the rod-like member 11 based on the first detection value that can determine the stationary state of the flying creature 20 and the second detection value that represents the external light environment. It is determined whether or not. Thereby, the flying creature detection device 10 can detect the flying creature 20 in consideration of the change in the external light environment, and can detect the flying creature 20 with high accuracy even when the external light environment changes. Can do.

  The flying organism detection device 10 includes a light transmission / diffusion unit 15 that surrounds the second light receiving unit 13 and diffuses transmitted light. Thereby, the natural light from the outside can be uniformly incident on the second light receiving unit 13, and the external light environment can be detected stably.

  The determination unit 17 determines whether the flying creature 20 is stationary at the upper end portion of the rod-shaped member 11 based on a change in the ratio between the first detection value and the second detection value. Thereby, the flying organism detection device 10 can easily detect the stationary state of the flying organism 20 based on the change in the ratio between the first detection value and the second detection value.

  The determination unit 17 determines whether or not the flying creature 20 is stationary at the upper end portion of the rod-shaped member 11 by comparing the instantaneous ratio Pt with the determination value Y calculated based on the average ratio Pe. Thereby, even if there is a difference between the sensitivity of the first light receiving unit 12 and the sensitivity of the second light receiving unit 13, it is possible to accurately detect the flying creatures 20 using the average ratio Pe and the instantaneous ratio Pt. it can.

  The determination unit 17 determines that the flying creature 20 has stopped at the upper end of the rod-shaped member 11 when the state in which the average ratio Pe exceeds the determination value Y continues for a predetermined time or longer. Thereby, for example, even if the natural light incident on the upper end portion of the rod-shaped member 11 is blocked for a moment by another object (such as fallen leaves) other than the flying creature 20, the flying creature 20 is erroneously stopped. There is no false detection.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, the flying creature 20 such as a dragonfly repeats stationary and flying relatively frequently, but may keep stationary for a long time. In this case, when the amount of sunshine greatly decreases while the flying creature 20 is stationary, the instantaneous ratio Pt decreases as the second detection value of the second light receiving unit 13 increases. Since the calculation of the determination value Y is stopped after the instantaneous ratio Pt exceeds the determination value Y, the instantaneous ratio Pt is determined by the change in the instantaneous ratio Pt even though the flying creature 20 is stationary. It is considered that the flying creature 20 is determined not to be stationary. For this reason, the determination unit 17 continues to calculate the average ratio Pe even after the instantaneous ratio Pt exceeds the determination value Y. Then, the determination unit 17 determines that the flying creature 20 has jumped from the upper end portion of the rod-shaped member 11 when the instantaneous ratio Pt is less than the determination value Y and the instantaneous ratio Pt is greatly reduced with respect to the average ratio Pe. May be.

  Further, in the above embodiment, for example, the Cds cell is used as the first light receiving unit 12 and the second light receiving unit 13, but an optical sensor other than the Cds cell may be used. For example, when an optical sensor other than the Cds cell is used as the first light receiving unit 12 and the second light receiving unit 13, the detection value may decrease as the amount of incident light decreases. Even in this case, the determination unit 17 determines that the instantaneous ratio Pt has decreased beyond the predetermined value with respect to the average ratio Pe, that is, the instantaneous ratio Pt has decreased beyond the predetermined value with respect to the average ratio Pe. In this case, it is determined that there is a possibility that the flying creature 20 is stationary at the upper end portion of the rod-shaped member 11. Then, when this state continues for a predetermined time or more, it may be determined that the flying creature 20 is stationary.

  In addition, if the flying organism detection apparatus 10 is based on the 1st detection value of the 1st light-receiving part 12, and the 2nd detection value of the 2nd light-receiving part 13, it will be other than the method using the ratio mentioned above. The flying creature 20 may be detected by a method. Moreover, it is a case where ratio is used, Comprising: The flying creature detection apparatus 10 may detect the flying creature 20 by methods other than the above-mentioned. The flying creature detection device 10 is not limited to determining that the flying creature 20 is stationary when the state in which the instantaneous ratio Pt exceeds the judgment value Y continues for a predetermined time or longer. For example, the flying creature detection device 10 may determine that the flying creature 20 is stationary as soon as the instantaneous ratio Pt exceeds the determination value Y.

  Although the flying organism detection system 100 that performs imaging with the imaging device 30 based on the detection result of the flying organism detection device 10 has been described as an example, the flying organism detection device 10 is applied to a system other than the system that performs imaging with the imaging device 30. May be.

  DESCRIPTION OF SYMBOLS 10 ... Flying organism detection apparatus, 11 ... Rod-shaped member, 12 ... 1st light-receiving part, 13 ... 2nd light-receiving part, 14, 18 ... Light-shielding member, 15 ... Light transmission diffusing part, 16 ... Cover, 17 ... Determination part , 20 ... flying creatures, 30 ... imaging device, 100 ... flying creature detection system, Pt ... instantaneous ratio, Pe ... average ratio, Y ... judgment value.

Claims (5)

A flying creature detection device for detecting flying creatures,
A rod-shaped member;
A first light receiving portion that is provided at the tip of the rod-shaped member and detects the amount of light incident on the tip of the rod-shaped member;
A light-shielding member surrounding the first light-receiving portion along the circumferential direction of the outer peripheral surface of the rod-shaped member;
A second light receiving portion that is provided at an intermediate position separated from the first light receiving portion by a predetermined length from the first light receiving portion toward the base end of the rod-shaped member, and detects the amount of light incident on the intermediate position;
Based on the first detection value detected by the first light receiving unit and the second detection value detected by the second light receiving unit, is the flying creature stationary at the tip of the rod-shaped member? A flying organism detection apparatus comprising: a determination unit that determines whether or not.   The flying organism detection device according to claim 1, further comprising a light transmission diffusion unit that surrounds the second light receiving unit and diffuses the transmitted light.   The said determination part determines whether the said flying creature is resting on the front-end | tip part of the said rod-shaped member based on the change of ratio of a said 1st detection value and a said 2nd detection value. The flying organism detection device according to 1 or 2. Pe is a ratio between an average value of the first detection value for a predetermined period and an average value of the second detection value for a predetermined period;
When the ratio between the first detection value and the second detection value is Pt,
The flying creature detection apparatus according to claim 3, wherein the determination unit determines that the flying creature is stationary at a tip end portion of the rod-shaped member when Pt changes beyond a predetermined value with respect to Pe.   5. The determination unit according to claim 4, wherein the determination unit determines that the flying creature has stopped at the tip of the rod-shaped member when a state in which Pt changes with respect to Pe for a predetermined time or longer has continued. Flying creature detection device.

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