JP4445838B2 - Biopotential detection apparatus, biological breeding apparatus, and biological breeding method - Google Patents

Description

  The present invention relates to a biopotential detection apparatus that can detect the potential of a living body in a natural state without being affected by the potential of the earth ground.

  Useful physiological information can be obtained by detecting electric potentials in living bodies such as human bodies and animals and plants.

In detecting the potential of the living body, for example, as shown in FIG. 6, the ground electrode GP and the signal electrodes SP1, SP2 are brought into contact with the living body 10, and the potential difference φ1-φ2 generated between the signal electrodes SP1, SP2 is measured by the electronic measuring instrument 1000. Are detected by the differential arithmetic unit 1001.
Kazushige Nakamura, Atsushi Matsumoto, "Characteristics of Tomato Leaf Potential and Application to Nutritional Diagnosis", Journal of Society of High Technology in Agriculture 11 (3), pp. 189-200, 1999.

  As shown in FIG. 6, generally, the reference potential of the electronic measuring instrument 1000 is made equal to the potential of the ground, the potential of the ground electrode GP is made equal to the reference potential, and then the ground electrode is brought into contact with the living body 10. . At this moment, the potential of the contact point becomes equal to the potential of the ground, which may change the potential of the signal electrode. Therefore, the measured potential is not necessarily reliable as the potential of the living body in a natural state.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a biopotential detection device that can detect the potential of a living body in a natural state without being affected by the potential of the ground. There is to do.

In order to solve the above-mentioned problems, the present invention of claim 1 is characterized in that two signal electrodes respectively contacting two different points of a living body, and two electric field application electrodes electrically connected to the signal electrodes, respectively. And an electro-optic crystal to which an electric field is applied via these electric field application electrodes, and a polarizing plate that allows a predetermined component of light emitted from the electro-optic crystal to pass through, and the light incident on the electro-optic crystal. Is modulated into light having an intensity corresponding to the potential difference between the two signal electrodes, and the light emitted from the light modulator is received, and the light is converted into a current corresponding to the intensity of the light. A bioelectric potential detecting device comprising: a photodetecting element that performs the above operation; and a resistor that converts the current into a voltage corresponding to the magnitude of the current, wherein a cathode of the photodetecting element is connected to a ground. Let it be a solution.

According to the first aspect of the present invention, even when the cathode of the light detection element is connected to the ground, the potential of the signal electrode does not change, and therefore , the natural state is not affected by the potential of the ground. The potential difference between two points on the living body can be detected.

The present invention of claim 2 includes a signal electrode that contacts one point of a living body, a signal electrode that is floated, two electric field application electrodes that are electrically connected to the signal electrode, and application of these electric fields. An electro-optic crystal to which an electric field is applied via the electrode for use, and a polarizing plate that allows a predetermined component of the light emitted from the electro-optic crystal to pass therethrough. An optical modulator that modulates and emits light having an intensity corresponding to the potential difference of the electrodes, and a light detecting element that receives the light emitted from the optical modulator and converts the light into a current corresponding to the intensity of the light; And a resistor for converting the current into a voltage corresponding to the magnitude of the current, and the cathode of the photodetecting element is connected to the earth ground .

According to the second aspect of the present invention, even when the cathode of the light detection element is connected to the ground, the potential of the signal electrode does not change, and therefore, the floating is not affected by the potential of the ground . The potential of the living body with respect to the signal electrode can be detected in a natural state.

The present invention of claim 3 is a signal electrode that contacts one point of a living body, a signal electrode that is connected to an object having a stable voltage, and two electric field applications that are electrically connected to the signal electrode, respectively. An electrode, an electro-optic crystal to which an electric field is applied via the electrode for applying an electric field, and a polarizing plate that allows a predetermined component of light emitted from the electro-optic crystal to pass through, and is incident on the electro-optic crystal An optical modulator that modulates the emitted light into light having an intensity corresponding to the potential difference between the two signal electrodes and emits the light, receives the light emitted from the optical modulator, and outputs the light according to the intensity of the light A bioelectric potential detector comprising: a photodetecting element that converts the current into a voltage corresponding to a magnitude of the current; and a cathode of the photodetecting element is connected to a ground. The device is the solution.

According to the third aspect of the present invention, even if the cathode of the photodetecting element is connected to the ground, the potential of the signal electrode does not change, and thus is not affected by the potential of the ground and is in a natural state. The potential of the living body can be detected and the detected potential can be stabilized.

According to a fourth aspect of the present invention, there is provided the bioelectric potential detection device according to any one of the first to third aspects, a spectrum analyzer that detects a frequency spectrum of the voltage converted by the resistance, and a nutrient for the living body. A biological growth apparatus comprising: a nutrient blender to be fed; and a computer that analyzes the frequency spectrum and operates the nutrient blender based on an analysis result of the analysis .

According to the present invention of claim 4, in a biological potential detecting device, the cathode of the light detecting element be connected to earth ground, potential of the signal electrode does not change, therefore, it was detected in natural state A living organism can be raised based on the potential of the living organism.

According to the biopotential detection device of the present invention, even if the cathode of the light detection element is connected to the ground, the potential of the signal electrode does not change, and therefore, the natural potential is not affected by the potential of the ground. The potential of the living body can be detected in the state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a biopotential detection apparatus 1A according to the first embodiment of the present invention.

  The bioelectric potential detection apparatus 1A includes, for example, a light source LS that generates light L1 that is circularly polarized light, and signal electrodes SP1 and SP2 that are electrically connected to signal electrodes SP1 and SP2 that are in contact with different points of the living body 10, respectively. Thus, the electric signal SG1 having a magnitude corresponding to the potential difference between the contact points φ1 and φ2 at the contact points where the signal electrodes SP1 and SP2 are in contact with each other is supplied, and the light L1 is incident and the light L1 is changed according to the magnitude of the electric signal SG1. An optical modulator 11 that modulates the intensity modulated light L2, a photodiode PD that is a light detection element that receives the light L2 and converts the light L2 into a current I having a magnitude corresponding to the intensity of the light L2, and a current I A resistor R that converts the voltage I into a voltage V corresponding to the magnitude of the current I is provided. For example, the cathode of the photodiode PD is connected to the ground.

FIG. 2 is a diagram illustrating a configuration example of the optical modulator 11.
In the optical modulator 11, for example, electric field application electrodes EP1 and EP2 electrically connected to the signal electrodes SP1 and SP2 are arranged, and the living body 10 is interposed via the signal electrodes SP1 and SP2 and the electric field application electrodes EP1 and EP2. An electric field E having an intensity corresponding to the potential difference between the potentials φ1 and φ2 is applied, and, for example, electro-optic (Electro- Optic (hereinafter referred to as EO) crystal 111 and, for example, a polarizing plate 112 that receives light modulated by the EO crystal 111 and passes only a specific linearly polarized light component and emits the light as intensity-modulated light L2 to the photodiode PD. It can be set as the structure provided with these. The optical modulator 11 is not limited to the configuration shown in FIG. 2 as long as the intensity of light can be modulated.

  Next, the operation of the biopotential detection apparatus 1A will be described.

  In FIG. 1, when the signal electrodes SP <b> 1 and SP <b> 2 are brought into contact with the living body 10, an electric signal SG <b> 1 having a magnitude corresponding to the potential difference between the potentials φ <b> 1 and φ <b> 2 of the living body 10 is supplied to the optical modulator 11. The light modulator 11 receives light L1 from the light source LS, and modulates the light L1 into light L2 having an intensity corresponding to the magnitude of the electric signal SG1.

  For example, in FIG. 2, an electric field E having an intensity corresponding to the potential difference between the potentials φ1 and φ2 of the living body 10 is applied to the EO crystal 111 via the signal electrodes SP1 and SP2 and the electric field application electrodes EP1 and EP2. The EO crystal 111 modulates, for example, the circularly polarized light L1 into elliptically polarized light having an ellipticity corresponding to the intensity of the electric field E. For example, the polarizing plate 112 receives the elliptically polarized light and allows only a specific linearly polarized light component to pass therethrough, and outputs this as the intensity-modulated light L2 to the photodiode PD.

  In FIG. 1, a photodiode PD receives light L2 and converts the light L2 into a current I having a magnitude corresponding to the intensity of the light L2. The resistor R converts the current I into a voltage V having a magnitude corresponding to the magnitude of the current I, that is, a voltage V proportional to the potential difference φ1-φ2.

  In the bioelectric potential detection apparatus 1A, although the cathode on the photodiode PD side is connected to the ground, the signal electrodes SP1 and SP2 are insulated from the ground, so that they are not affected by the potential of the ground. The potential of the living body 10 can be detected in a natural state.

  Further, in the bioelectric potential detection apparatus 1A, even if noise is superimposed on the potential of the living body 10, the noise is superimposed on both the potentials φ1 and φ2, so that the noise is canceled by detecting the potential difference φ1-φ2. can do.

  FIG. 3 is a diagram showing a configuration of a biopotential detection apparatus 1B according to the second embodiment of the present invention. Here, the same reference numerals are given to those described in FIG.

  The biopotential detection apparatus 1B includes a light source LS, an optical modulator 11, a photodiode PD, and a resistor R, as in the biopotential detection apparatus 1A. The difference from the biopotential detection device 1A is that the signal electrode SP2 is in a floating state.

  In the bioelectric potential detection device 1B, when the signal electrode SP1 is brought into contact with the living body 10 and the signal electrode SP2 is floated, an electric signal SG11 having a magnitude corresponding to the potential difference between the potential φ1 of the living body 10 and the potential φ21 of the signal electrode SP2 is emitted. It is supplied to the modulator 11. The light modulator 11 receives light L1 from the light source LS and modulates the light L1 into light L21 having an intensity corresponding to the magnitude of the electric signal SG11.

  The photodiode PD receives the light L21 and converts the light L21 into a current I1 having a magnitude corresponding to the intensity of the light L21. The resistor R converts the current I1 into a voltage V1 having a magnitude corresponding to the magnitude of the current I1, that is, a voltage V1 proportional to the potential difference φ1 to φ21.

  In the biopotential detection device 1B, the cathode on the photodiode PD side is connected to the ground, but the signal electrodes SP1 and SP2 are insulated from the ground, so that they are not affected by the potential of the ground. The potential of the living body 10 can be detected in a natural state.

  FIG. 4 is a diagram showing a configuration of a biopotential detection apparatus 1C according to the third embodiment of the present invention. Here, the same reference numerals are given to those described in FIG.

  The biopotential detection apparatus 1C includes a light source LS, an optical modulator 11, a photodiode PD, and a resistor R, similarly to the biopotential detection apparatus 1A. The difference from the biopotential detection device 1A is that the signal electrode SP2 is connected to an object 20 having a stable voltage, for example, a metal having a large capacitance such as a metal plate having a large area.

  In the bioelectric potential detection device 1B, when the signal electrode SP1 is brought into contact with the living body 10 and the signal electrode SP2 is connected to the object 20, the electric potential having a magnitude corresponding to the potential difference between the potential φ1 of the living body 10 and the potential φ22 of the signal electrode SP2. The signal SG12 is supplied to the optical modulator 11. The light modulator 11 receives light L1 from the light source LS and modulates the light L1 into light L22 having an intensity corresponding to the magnitude of the electric signal SG12.

  The photodiode PD receives the light L22 and converts the light L22 into a current I2 having a magnitude corresponding to the intensity of the light L22. The resistor R converts the current I2 into a voltage V2 having a magnitude corresponding to the magnitude of the current I2, that is, a voltage V2 proportional to the potential difference φ1 to φ22.

  In the biopotential detection device 1C, although the cathode on the photodiode PD side is connected to the ground, the signal electrodes SP1 and SP2 are insulated from the ground, so that they are not affected by the potential of the ground. The potential of the living body 10 can be detected in a natural state.

  In the biopotential detection apparatus 1C, since the signal electrode SP2 is connected to the object 20 having a stable voltage, the detected potential can be stabilized, that is, the potential of the living body can be detected more accurately. be able to. In addition, the biopotential detection device 1C can have higher detection sensitivity than the biopotential detection device 1B.

  FIG. 5 is a diagram illustrating a configuration example of the biological breeding apparatus 100 including the biopotential detection apparatus 1A according to the first embodiment of the present invention. Here, the same reference numerals are given to those described in FIG. In addition, the biological breeding apparatus 100 may include a biopotential detection apparatus 1B or 1C.

  The biological breeding apparatus 100, for example, supplies nutrients to the spectrum analyzer 2 that detects the frequency spectrum of the voltage V further converted from the current I converted by the photodiode PD of the bioelectric potential detection apparatus 1A and the living body 10 (for example, a plant). A nutrient blender 3 as a biological breeding means for growing a living organism by blending and giving, and a computer as an analysis means for analyzing a frequency spectrum detected by the spectrum analyzer 2, and further a nutrient blender based on the analysis result And a computer 4 configured to operate 3.

  In the biological breeding method performed by the biological breeding apparatus 100, when the voltage V is supplied to the spectrum analyzer 2, the spectrum analyzer 2 calculates the frequency spectrum of the voltage V and transmits the calculation result to the computer 4.

  In plants and the like, it is known that when a specific nutrient is insufficient, the signal intensity of a specific frequency increases. For example, when the frequency is increased, the computer 4 replaces this nutrient. The nutrient blender 3 is operated so that nutrients are blended so as to be contained in a large amount and given to the living body 10.

  In addition, when implementing the biological breeding method which does not use the nutrient mixing device 3, the calculation result transmitted to the computer 4 may be displayed or printed, and a human may mix a nutrient based on this.

  In the example of FIG. 5, the nutrients are mixed and supplied. However, for example, the sunshine duration may be adjusted based on the calculation result.

  As described above, according to the organism growing device 100 and the organism growing method, it is possible to grow an organism based on the potential of the living body detected in a natural state.

It is a figure which shows the structure of 1 A of biopotential detection apparatuses which concern on the 1st Embodiment of this invention. 2 is a diagram illustrating a configuration example of an optical modulator 11. FIG. It is a figure which shows the structure of the bioelectric potential detection apparatus 1B which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of 1 C of bioelectric potential detection apparatuses which concern on the 3rd Embodiment of this invention. It is a figure which shows 1 structural example of the biological breeding apparatus 100 provided with 1 A of bioelectric potential detection apparatuses which concern on the 1st Embodiment of this invention. It is a figure which shows the apparatus structure when detecting the electric potential of a biological body conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B, 1C ... Bioelectric potential detection apparatus 2 ... Spectrum analyzer 3 ... Nutrient preparation device 4 ... Computer 10 ... Living body 11 ... Light modulator 20 ... Object 100 ... Biological growth apparatus 111 ... EO crystal 112 ... Polarizing plate EP1, EP2 ... Electrode for electric field application L1, L2, L11, L12 ... Light PD ... Photodiode R ... Resistance SG1, SG11, SG12 ... Electric signal SP1, SP2 ... Signal electrode φ1, φ2 ... Potential of living body

Claims (4)

Two signal electrodes respectively contacting two different points of the living body;
Two electric field application electrodes electrically connected to the signal electrode, an electro-optic crystal to which an electric field is applied via these electric field application electrodes, and a predetermined component of light emitted from the electro-optic crystal And a light modulator that modulates the light incident on the electro-optic crystal into light having an intensity corresponding to a potential difference between the two signal electrodes,
A light detecting element that receives light emitted from the light modulator and converts the light into a current corresponding to the intensity of the light;
A resistor for converting the current into a voltage corresponding to the magnitude of the current;
With
A biopotential detection apparatus, wherein a cathode of the light detection element is connected to a ground . A signal electrode that contacts one point of the living body;
A floating signal electrode;
Two electric field application electrodes electrically connected to the signal electrode, an electro-optic crystal to which an electric field is applied via these electric field application electrodes, and a predetermined component of light emitted from the electro-optic crystal And a light modulator that modulates the light incident on the electro-optic crystal into light having an intensity corresponding to a potential difference between the two signal electrodes,
A light detecting element that receives light emitted from the light modulator and converts the light into a current corresponding to the intensity of the light;
A resistor for converting the current into a voltage corresponding to the magnitude of the current;
With
A biopotential detection apparatus, wherein a cathode of the light detection element is connected to a ground . A signal electrode that contacts one point of the living body;
A signal electrode connected to an object of stable voltage;
Two electric field application electrodes electrically connected to the signal electrode, an electro-optic crystal to which an electric field is applied via these electric field application electrodes, and a predetermined component of light emitted from the electro-optic crystal And a light modulator that modulates the light incident on the electro-optic crystal into light having an intensity corresponding to a potential difference between the two signal electrodes,
A light detecting element that receives light emitted from the light modulator and converts the light into a current corresponding to the intensity of the light;
A resistor for converting the current into a voltage corresponding to the magnitude of the current;
With
A biopotential detection apparatus, wherein a cathode of the light detection element is connected to a ground . The biopotential detection device according to any one of claims 1 to 3,
A spectrum analyzer for detecting a frequency spectrum of the voltage converted by the resistor;
A nutrient blender that blends and gives nutrients to the living body;
A biological growth apparatus comprising: a computer that analyzes the frequency spectrum and operates the nutrient blender based on an analysis result of the analysis .

Images