JP3880855B2 - Radiation nondestructive inspection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radiation non-destructive inspection technique applied to an industrial non-destructive testing, in particular to radiological nondestructive inspection method drums using a color emission.
[0002]
[Prior art]
When radiation passes through a substance, absorption and scattering differ depending on the type and shape of the constituent substance. If this is recorded as an image as a photograph, video, digital file, etc., it is possible to grasp the damage state, change, filling state, etc. of the substance . The method of measuring the internal state of the object or specimen to be measured without breaking is called radiography or a nondestructive radiography.
[0003]
In X-ray imaging used for industrial non-destructive inspection, an X-ray film is usually used in combination with a radiation intensifying screen in order to improve the sensitivity of the imaging system. In X-ray imaging, a transmitted image of a subject is obtained by, for example, blackening silver particles on an X-ray film with X-rays transmitted through the subject or light converted to visible light by an intensifying screen. ing.
[0004]
As a radiation intensifying screen used for X-ray photography or the like, a phosphor layer having an emission peak corresponding to an X-ray film and a protective film for protecting the same were formed on a support made of paper or plastic in order. Things are common. In recent years, a photodetection element such as a CCD camera is used as an imaging system, and a difference in the amount of transmitted radiation is digitally detected without using an X-ray film.
[0005]
In conventional radiography, there is X-ray imaging using a high-contrast film with a particularly large characteristic curve gradient in order to improve diagnostic ability . However , there is a problem that a photographic image with an appropriate density cannot be obtained due to a slight deviation in photographing conditions. That is, it is a problem in that the dynamic range of measurement is narrow. When the elemental composition of the measurement object is different, the X-ray irradiation time must be determined from many experiences in consideration of the X-ray energy to be used and the thickness of the part .
[0006]
On the other hand, according to Japanese Patent Publication No. 48-6157 and Japanese Patent Publication No. 48-12676, in conventional color radiography, a color X-ray photograph in which the color is changed corresponding to the difference in X-ray dose can be obtained. . However, even if it is attempted to extract information only from the color change on such a color X-ray photograph, for example, a green component or a blue component is added to the red component at a portion where the dose is large, and the color photograph is close to white. On the other hand, there is a problem that it is difficult to extract information, and even if a large amount of information is included, it cannot be used effectively. In some cases, it is difficult to extract information from a normal black-and-white photograph.
[0007]
In contrast, according to Japanese Patent Laid-Open No. 2001-209142, a color light emitting sheet that emits a plurality of colors when irradiated with radiation such as X-rays that have passed through a subject, and a plurality of light emitted from the color light emitting sheet. There has been proposed a color X-ray system that includes light detection means such as a color film or a color camera for detecting color emission for each color and obtains image information of a plurality of colors having different sensitivity characteristics. In addition, the color light emitting sheet has, for example, a main light emitting component corresponding to one light emission color in the visible light region and a light emission ratio different from that of the main light emitting component, and a light emission ratio for radiation of the same intensity is different from that of the main light emitting component. A phosphor is used that has at least one sub-light-emitting component and in which the light emission ratio between the main light-emitting component and the sub-light-emitting component is adjusted according to the dynamic range of the imaging system.
[0008]
FIG. 8 is a graph showing an example of characteristics regarding the density and the amount of received light obtained when X-rays are applied. According to the above-described color X-ray system, as shown by characteristic curves R (indicating red), G (indicating green), B (indicating blue) and the like in FIG. An image can be obtained by detecting, for each color, light of a plurality of colors emitted corresponding to a difference in X-ray dose using characteristics indicating the relationship. In the obtained image, the low-dose portion is obtained as red information without green and blue information, the red information is saturated and obtained as green information when the dose increases, and red when the dose increases further. The green information is saturated and obtained as blue information. That is, it is possible to obtain a photographic image having an appropriate density under relatively wide conditions and obtain a lot of information from the obtained photographic image.
[0009]
However, this color X-ray system describes a basic method for expanding the dynamic range of an imaging system, but depending on the subject, the conditions are not necessarily appropriate, and an appropriate photographic image may not be obtained within the imaging range. is there. For example, in the case where the object to be measured is iron and plastic, the optimization of the photographing conditions is naturally different based on the difference in specific gravity, and the thickness of the photographing object portion must also be taken into consideration. Furthermore, when there are a plurality of different substances such as a composite material, an appropriate photographic image may not be obtained.
[0010]
On the other hand, when a film, an imaging plate, or the like is used in the above-described measurement method, a result obtained directly on the spot cannot be obtained, and image information cannot be obtained unless development or laser reading is performed. On the other hand, as a method for directly capturing an image as digital information, a moving image system combined with a monochrome CCD camera using an electron tube image intensifier and a semiconductor type flat detector using a liquid crystal display as a light receiving device have been developed. In systems using these detectors, still images and moving images can be viewed directly on the monitor, but since the X-ray detector is monochrome, images with a wide dynamic range can be viewed simultaneously. Can not. Moreover, even if the dynamic range is widened in monochrome due to the problem of human visibility, the range in which the gray difference can be recognized is limited. Generally, the density difference is 1 to 2 digits. Furthermore, at present, these detectors are not large in terms of manufacturing. It is about 30 centimeters square, and the price is quite high.
[0011]
[Problems to be solved by the invention]
As described above, in conventional radiography, there is a problem that when a high-contrast film is used, a photographic image with an appropriate density cannot be obtained due to a slight deviation in imaging conditions. In addition, since the amount of transmitted radiation is related to the specific gravity and density of the measurement object, when photographing a part where a substance with a different specific gravity exists or a part where a substance with a different density exists. It is difficult to set shooting conditions, and it is impossible to obtain a photo with an appropriate density.
[0012]
On the other hand, the conventional color radiography merely changes the color corresponding to the difference in X-ray dose. There is a problem that it is difficult to extract information only from the color change on such a color X-ray photograph, and that even if a large amount of information is included, they cannot be used effectively. In some cases, it is difficult to extract information from a normal black-and-white photograph.
[0013]
In addition, in the color X-ray system, the dynamic range of the imaging system has been widened, and measurement with fewer failures has become possible. However, if the subject is clear, the color emission ratio can be changed according to the subject. It is required to adjust another characteristic curve.
[0014]
For this reason, for example, it is possible to set appropriate imaging conditions according to subjects with different amounts of X-ray transmission, and prevent the occurrence of insufficient exposure and excessive exposure due to slight differences in imaging conditions, Furthermore, there is a need for a radiation imaging system that can effectively use a lot of obtained information. Relaxing the condition setting at the time of radiation imaging not only prevents the occurrence of imaging errors and reduces excessive radiation, but also greatly contributes to improvement of inspection accuracy.
[0015]
The present invention has been made in order to cope with such problems. The purpose of the present invention is to provide a photographic image having an appropriate density and an accurate photographic image according to the subject even when, for example, the contrast of the radiograph is increased. An object of the present invention is to provide a radiation nondestructive inspection apparatus that can be obtained.
[0016]
Another object of the present invention is to obtain a photographic image having an appropriate density and an accurate photographic image according to the subject, and to obtain a large amount of information reliably and effectively by a single photographing according to the subject. It is an object of the present invention to provide a radiation nondestructive inspection apparatus.
[0017]
In addition, an object of the present invention is to obtain a photographic image having an appropriate density and an accurate photographic image according to the subject, information on the state of photographing and the state of the subject viewed from the outside, and an internal nondestructive image It is intended to provide a radiation nondestructive inspection apparatus capable of simultaneously observing and recording in situ.
[0018]
In addition, an object of the present invention is to obtain a photographic image having an appropriate concentration and an accurate photographic image according to the subject, and to transmit or transmit the obtained image to a remote location at the same time for observation or recording. It is to provide a radiation nondestructive inspection apparatus.
[0019]
Furthermore, the objective of this invention is providing the radiation nondestructive inspection method which can perform an exact radiation nondestructive inspection using the said radiation nondestructive inspection apparatus.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a radiation source for irradiating a drum can integrally provided with an angle discrimination mark on the outer peripheral surface, and radiation irradiated from the radiation source. A color light-emitting sheet that is disposed in front of the subject, emits a plurality of colors by the radiation, and has phosphors having different ratios of the light emission of the plurality of colors with respect to radiation of the same intensity; and a rear side of the color light-emitting sheet processor which detect the color CCD camera, as the image information including a plurality of color signals received by the color CCD camera separated into RGB signals independent image information of each color of light emission of the plurality of colors provided When the radiation source while rotating the drum, transfer of moving at least one relatively continuous with respect to radiation and color luminescent sheet A and radiation non-destructive inspection method using a radiation non-destructive inspection apparatus of a drum formed by comprising means performs imaging in the color CCD camera while rotating the drum at said mobile unit, for detecting the label characterized in that to determine the orientation of the drum to be moved by said moving means by. In other words, in the present invention, as a method of moving the subject relative to the radiation for imaging, the three-dimensional movement of the drum can be performed without stopping the flow of the drum can subject by continuously moving and imaging while rotating the drum can by the moving means. Enables transparent viewing.
[0026]
According to a second aspect of the present invention, in the radiation nondestructive inspection method according to the first aspect, a three-dimensional image is obtained by performing an image reconstruction process from a color image picked up by moving the drum relative to the radiation. It is characterized by that. That is, a tomographic image is viewed by obtaining a stereoscopic image (generally CT: a computed tomography image) by reconstructing an image from a color image obtained by moving the subject relative to radiation and using a computer. Make it possible.
[0027]
According to a third aspect of the present invention, in the radiation nondestructive inspection method according to the first aspect, an image obtained by separating and detecting a plurality of colors of light emitted from a phosphor based on an appearance image of the drum and radiation irradiation. Is displayed, the position or amount of movement of the mark attached to the drum can is displayed . That is, it is easy to understand the position and direction of the subject when simultaneously displaying and recording images detected by separating the color emission emitted from the phosphors according to the appearance and radiation of the subject according to color. In this manner, the direction of shooting and the internal position can be clearly defined by simultaneously displaying and recording the position of the marker and the subject and the movement amount.
[0028]
According to a fourth aspect of the present invention, in the radiation nondestructive inspection method according to the first aspect, a sign is read from an appearance image of the drum can, and the feature, inspection position, or movement amount of the drum can is displayed. That is, in relation to the third aspect , in particular, for a subject that is difficult to distinguish from any direction such as a sphere, a cylinder, or a cone, the subject is labeled so that the appearance position becomes clear. By reading the sign from the image and simultaneously displaying and recording the feature of the subject, the examination position, and the movement amount, it is possible to clarify the photographing direction and the internal position.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a radiation nondestructive inspection apparatus and a radiation nondestructive inspection method according to the present invention will be described with reference to the drawings.
[0031]
FIG. 1 is a schematic configuration diagram schematically showing a basic configuration example of a radiation imaging apparatus to which the radiation nondestructive inspection apparatus of the present invention is applied. As shown in FIG. 1, the radiation imaging apparatus targets a subject 1 such as various articles, and a radiation source such as an X-ray tube 2 is opposed to the subject 1. The X-ray tube 2 emits radiation such as X-rays 3. Note that the radiation used for imaging is not limited to X-rays (or γ-rays), and β-rays, thermal neutron rays, and the like can also be used.
[0032]
A color light emitting sheet 4 as a color light emitting means is disposed on the opposite side of the subject 1 from the X-ray tube 2, and the X-ray 3 absorbed or scattered by the subject 1 is this color light emitting sheet 4. Is irradiated. The color light-emitting sheet has phosphors that emit light in a plurality of colors with respect to radiation such as X-rays 3. The light of a plurality of colors emitted from the color light emitting sheet 4 has a luminance distribution according to the distribution of the X-rays 3 absorbed or scattered by the subject 1. Further, the color light emitting sheet 4 is configured such that the color light emission ratio can be changed according to the subject.
[0033]
A color CCD camera 5 is arranged behind the color light emitting sheet 4 as means for collectively receiving light of a plurality of colors from the color light emitting sheet 4. The color CCD camera 5 collectively receives light of a plurality of colors (image information of a plurality of colors) having a light emission distribution based on the distribution information of the X-rays 3 absorbed or scattered by the subject 1.
[0034]
Image information including a plurality of color signals received and detected by the color CCD camera 5 is separated into RGB signals by the arithmetic processing unit 6 and detected as individual image information of each color. The image information of each color is recorded as a digital signal in a recording unit, for example, a memory of the arithmetic processing unit 6. At this time, the dynamic range can be adjusted by changing the ratio of the RGB signals indicating red, green, and blue after separating the white component. In the figure, reference numeral 7 denotes a display device which can directly display image information of each color.
[0035]
Further, the signals separated for each color can be calculated by each signal and the result can be recorded. For example, when the difference in density can be confirmed with a red component in a certain substance and the difference in density is visible with a green component in another substance, it can be displayed in a pseudo color so that each can be seen. Also, only that portion can be cut out and displayed separately. Furthermore, the noise in the red component can be corrected with the green component and the blue component, and the portion that is white due to the loss of some data can be corrected.
[0036]
A monitor camera 9 for observing the appearance at the same time as the above-described transmission image is provided, and at the same time, remote diagnosis by the communication device 8 is possible.
[0037]
FIG. 2 is a cross-sectional view showing an example of the configuration of a color light emitting sheet used in the radiation imaging apparatus shown in FIG. As shown in FIG. 2, the color light emitting sheet 4 includes a sheet base material 10 made of, for example, a plastic film or a nonwoven fabric, and the phosphor layer 11 is provided on the sheet base material 10. A transparent protective film 12, for example, a protective film 12 made of a polyethylene terephthalate film having a thickness of about several μm is disposed on the phosphor layer 11 as necessary.
[0038]
The phosphor layer 11 described above includes a phosphor that emits light in a plurality of colors, that is, a phosphor having a plurality of emission wavelength regions. For the phosphor layer 11, for example, considering a color CCD camera, it is preferable to use a phosphor that emits light in a wide wavelength range within a visible light region (for example, a region having a wavelength of 400 to 700 nm). Specifically, it is preferable to use a phosphor having an emission spectrum corresponding to at least two emission colors in the visible light region. That is, it is preferable to use a phosphor having an emission spectrum including a main light emitting component and a sub light emitting component having different emission colors.
[0039]
As the emission color of the phosphor, typically, at least two emission colors among blue emission, green emission, and red emission are given. However, it is not limited to these emission colors, and various emission colors can be applied as long as the emission colors can be distinguished from each other. For example, purple emission or yellow emission close to ultraviolet rays may be used.
[0040]
3A and 3B show sensitivity characteristics (sensitivity matching) between the color light-emitting sheet 4 and the color CCD camera 5 used in the radiation imaging apparatus shown in FIG. 1, and the concentration and emission of phosphor activator. It is a graph which shows a wavelength.
[0041]
FIG. 3A shows the sensitivity characteristics of the two types of CCD cameras 5 (A, B) and the light emission of the phosphors Gd 2 O 2 S: Eu (solid line) and Gd 2 O 2 S: Tb (two-dot chain line) used in the color light emitting sheet 4. The characteristics are shown. The sensitivity of the camera A indicated by the broken line is higher than the sensitivity of the camera B indicated by the alternate long and short dash line in FIG. In this case, compared with the phosphor Gd2O2S: Tb, Gd2O2S: Eu matches the sensitivity characteristic of the camera, and the imaging sensitivity is relatively high.
[0042]
FIG. 3B shows a case where the concentration of the phosphor activator Eu of the phosphor Gd2O2S: Eu is changed (4% and 0.1%). As shown in FIG. 3B, when the concentration of the phosphor Gd2O2S: Eu activator Eu is changed, the ratio of the red light emitting region (R), the green light emitting region (G), and the blue light emitting region (B) is changed. Can be changed. That is, by using a characteristic curve indicating the relationship between exposure amount and density of the imaging system as shown in FIG. 8, a plurality of colors of light emitted corresponding to the difference in X-ray dose are detected for each color. An image is obtained. In the obtained image, the low-dose part is obtained as red information without green and blue information, the red information is saturated and obtained as green information when the dose increases, and red when the dose further increases. The green information is saturated and obtained as blue information. That is, it is possible to obtain a photographic image having an appropriate density under relatively wide conditions and obtain a lot of information from the obtained photographic image.
[0043]
FIG. 4 shows a specific configuration example in which the radiation nondestructive inspection apparatus of the present invention is applied to a drum can. In the configuration example shown in FIG. 4, a drum can 13 is used as the subject 1. And the X-ray tube 2 as an X-ray generator which is a radiation source and the monitor camera 9 which observes the external appearance of the drum can 13 are installed in the same support | pillar. Further, as moving means for moving the drum can 13 to a position facing the X-ray tube 2 and the monitor camera 9, a horizontally arranged conveyor 14 and a turntable 15 for moving the drum can 13 up and down are provided. The conveyor 14 has a function of moving a drum can by a number of rollers 14a and a function of moving the roller 14a by a belt 14b. A plurality of drum cans 13 are mounted on the roller 14a in a vertical state, and the roller 14a is mounted. It can be advanced to the position of the X-ray tube 2 and the monitor camera 9 while being rotated. The turntable 15 is disposed at a position facing the X-ray tube 2 and the monitor camera 9, and the drum can 13 can be rotated, for example, around a vertical axis. A color light emitting sheet 4 and a color CCD camera 5 are disposed at positions facing the X-ray tube 2 and the monitor camera 9 with the drum 13 interposed therebetween. Although not shown in FIG. 4, the color CCD camera 5 is connected to the arithmetic processing unit 6, the display unit 7 and the communication unit 8 as in FIG. Alternatively, information transmission is performed wirelessly. Moreover, although not shown in figure, the elevator which moves the drum can 13 up and down is provided.
[0044]
However, the appearance of the drum 13 is less determined than from only appearance if viewed from either direction because it is cylindrical. Therefore, the angle discriminating marker 13a is integrally attached on the outer peripheral surface of the drum can 13, and the drum can number, company name, logo, etc. are written on the outer peripheral surface of the marker 13a and the drum can 13, and the monitor camera 9 The device makes it easy to distinguish the direction.
[0045]
In imaging, X-rays irradiated from the X-ray tube 2 pass through the drum can 13 and are input to the color light emitting sheet 4 and the color CCD camera 5. Image information in the drum 13 including a plurality of color signals detected by the color light emitting sheet 4 and the color CCD camera 5 is separated into RGB signals by the arithmetic processing unit 6 and detected as individual image information of each color. The image information of each color is displayed as a digital signal on the display device 7 and recorded in a recording unit such as the communication device 8. Furthermore, this data is transmitted to a place where it can be remotely operated.
[0046]
In the apparatus shown in FIG. 4, while rotating an article such as a drum can 13, an external appearance and an internal nondestructive image can be obtained simultaneously, and an image having a wide dynamic range can be obtained simultaneously by a color light emitting sheet and a color CCD camera.
[0047]
FIGS. 5A to 5E are explanatory diagrams illustrating results obtained using the apparatus shown in FIG. Each of FIGS. 5A to 5E is drawn based on a photograph obtained by actually capturing a small drum 13, and FIG. 5A shows a color acquired image. (B) has shown the external appearance image. 5C, 5D, and 5E respectively show a red component image, a green component image, and a blue component image.
[0048]
Inside the drum can 13, an iron pipe 27 a, a spanner 27 b, a driver 27 c, and the like were inserted as inserts 27 and photographed while rotating. As shown in FIG. 5C, the structure of an object such as iron that is difficult to transmit X-rays is clearly visible in the red component image. For example, the shaded portion such as the state of the pipe 27a and the state of the spanner 27b is seen through. On the other hand, an object made of resin such as a handle of a driver can be confirmed by a green component (FIG. 5D) and a blue component (FIG. 5E). In these components, unlike the red component, iron is only reflected as a black shade. Furthermore, it is easy to confirm the shadowed object by rotating the image, and images having different color components can be observed at the same time. Therefore, it is easy to confirm the contents instantly on the spot. In addition, an external monitor image (FIG. 5B) can be observed at the same time, and the direction and the filling state of the contents are easily understood.
[0049]
FIG. 6 illustrates the main configuration of an embodiment in which the radiation nondestructive inspection apparatus of the present invention is applied to piping. In the configuration example shown in FIG. 6, a radiation nondestructive inspection apparatus when a pipe 16 is used as the subject 1 is shown. An X-ray tube 2 and a monitor camera 9 as well as a color light emitting sheet 4 and a color CCD camera 5 are integrated in a head 17 as an X-ray generator.
[0050]
The unit 18 has a function of displaying and recording the power to be sent to the head 17, the appearance obtained from the head 17 and transmission image information including a plurality of color signals, and further transmitting it remotely. The head 17 has a function of rotating around the pipe 16 and self-running in the horizontal direction along the pipe 16, for example. The work area is restricted by the pole 19. Then, as shown with a frame in FIG. 6, diagnosis by image information and operation of the head 17 and unit 18 can be performed by the computer 21 by transferring information at a place 20 where remote operation is possible.
[0051]
FIG. 7 is an explanatory diagram showing a configuration example in which the radiation nondestructive inspection apparatus of the present invention is applied to an object that is difficult to move. As shown in FIG. 7, an object that is difficult to move as the subject 1 is mounted on the table 23, and this table 23 is arranged on the operating table 24.
[0052]
An X-ray tube 2 as an X-ray generator and a collimator 22 that determines the direction of the X-ray 3 are arranged above the subject 1.
[0053]
A color light emitting sheet 4 is provided below the base 23 so as to be positioned almost directly below the subject 1, and a reflecting mirror 25 is obliquely provided below the color light emitting sheet 4. A color CCD camera 5 having a zoom lens 26 is disposed at a position facing the mirror 25.
[0054]
At the time of imaging, X-rays 3 irradiated downward from the X-ray tube 2 pass through the subject 1. A transmission image including a plurality of color signals emitted from the color light emitting sheet 4 is reflected by the mirror 25 and bent in the horizontal direction, and is captured by the color CCD camera 5 through the zoom lens 26. These are integrated into one image pickup unit and can be moved under the base 23. The imaging unit can be viewed in conjunction with the collimator 22 by moving a specific part in the XY directions. Furthermore, it is also possible to enlarge and view locally with the zoom lens 26.
[0055]
According to the above embodiment, the radiation source such as the X-ray tube 2 that irradiates the subject 1 with radiation, and the radiation irradiated from the radiation source are disposed at the destination through the subject 1, and a plurality of radiation sources are emitted by the radiation. A color light-emitting sheet 4 having a phosphor that emits light in a color and has different ratios of light emission of a plurality of colors with respect to radiation having the same intensity, and a plurality of colors emitted from the phosphor based on radiation irradiation are separated by color By adopting a configuration including detection means such as a color CCD camera 5 for detection, an image having a wide dynamic range can be obtained simultaneously.
[0056]
Further, since it includes moving means such as a conveyor 14 and a turntable 15 for moving at least one of the radiation source, radiation, the subject 1 and the color light emitting sheet 4 relative to the other, for example, the subject 1 On the other hand, by moving the radiation source and the color light-emitting sheet 4 relatively to pick up an image, it is possible to easily check a thin object that cannot be confirmed from one direction or an object that is difficult to see hidden behind heavy metal.
[0057]
Further, a monitor camera 9 for observing the appearance of the subject 1 and an image of the monitor camera 9 and a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on radiation irradiation are simultaneously displayed. Display means such as the display device 7 or a recording means for recording these images, a plurality of images emitted from the phosphor based on the image of the camera for observing the appearance of the subject 1 and the radiation irradiation. Images detected by separating the color emission by color can be displayed or recorded at the same time, and what is contained in what direction in the direction seen from the appearance and what state it is in easy.
[0058]
Further, communication for transferring a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on an image of the monitor camera 9 and irradiation of radiation to a position separated from the subject 1 by wire or wirelessly. Since the image transfer means such as the apparatus 8 is provided, the acquired image can be transferred by wire or wireless to perform remote diagnosis.
[0059]
Further, a zoom lens 26 or the like that optically or electronically enlarges a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on an image of the monitor camera 9 and irradiation of radiation. Since a mechanism is provided and an image can be enlarged and observed, resolution at a local location can be increased.
[0060]
Further, when imaging is performed by moving the subject 1 relative to the radiation, the subject 1 is continuously moved by the conveying means such as the conveyor 14 while rotating the subject 1 up and down or left and right. Thus, stereoscopic perspective can be performed without stopping the flow of the line of the subject 1.
[0061]
In addition, a tomographic image is observed by a computed tomography image by obtaining a stereoscopic image by reconstructing an image by the computer 21 from a color image captured by moving the subject 1 relative to the radiation. It can be performed.
[0062]
Further, when the appearance image of the subject 1 and the image detected by separating the plurality of colors of light emitted from the phosphor based on the irradiation of radiation are displayed or recorded simultaneously, the subject 1 or By simultaneously displaying or recording the position or amount of movement of the indicator 13a indicating this, the appearance image of the subject 1 and the light emission of the plurality of colors emitted from the phosphors based on the radiation irradiation can be separated by color. When the detected image is simultaneously displayed and recorded, the position and direction of the subject 1 can be easily understood.
[0063]
Further, by attaching a label 13a to the subject 1 and reading the label 13a from the appearance image of the subject 1, and simultaneously displaying or recording the feature, the examination position or the movement amount of the subject 1, a sphere, The appearance position becomes clear for a subject such as a cylinder or a cone whose appearance is difficult to distinguish from any direction, and the imaging direction and the internal position can be clearly known.
[0064]
While the subject 1 is fixed, at least one of the radiation source, the camera, and the detection means is moved relative to the subject, and the position or movement amount of the subject 1 or the label 13a indicating the same is simultaneously set. By displaying or recording, it is possible to reduce the movement burden when it is difficult to move the subject 1.
[0065]
【The invention's effect】
As described above, according to the radiation nondestructive inspection apparatus of the present invention, even when the contrast of a radiographic image is increased, an image having an appropriate density according to the subject is obtained, and once according to the subject. It is possible to reliably and effectively obtain a lot of information by shooting. In addition, by simultaneously capturing the exposure range (dynamic range) of the imaging system and the external observation of the subject, the internal situation when viewed from the external appearance can be accurately determined, and it is hidden accurately by operating relatively. The information will be much easier to check. Therefore, in various types of radiography, it is possible to suppress the occurrence of imaging errors, increase inspection information, improve inspection accuracy, and the like.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing a main configuration of an embodiment of a radiation imaging apparatus to which a radiation nondestructive inspection apparatus of the present invention is applied.
2 is a cross-sectional view showing an example of the configuration of a color light emitting sheet used in the radiation imaging apparatus shown in FIG.
FIGS. 3A and 3B are diagrams showing sensitivity characteristics, phosphor activator concentration, and emission wavelength of a color light emitting sheet and a color CCD camera used in the radiation imaging apparatus shown in FIG. 1;
FIG. 4 is a diagram showing a main configuration of an embodiment in which the radiation nondestructive inspection apparatus of the present invention is applied to a drum can.
FIGS. 5A, 5B, 5C, 5D, and 5E are diagrams showing examples of results obtained by using the radiation nondestructive inspection apparatus shown in FIG.
FIG. 6 is a diagram showing a main configuration of an embodiment in which the radiation nondestructive inspection apparatus of the present invention is applied to piping.
FIG. 7 is a diagram showing a main configuration of an embodiment in which the radiation nondestructive inspection apparatus of the present invention is applied to an object that is difficult to move.
FIG. 8 is a diagram showing an example of a characteristic curve of density and received light amount obtained when the radiation nondestructive inspection apparatus of the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... X-ray tube, 3 ... X-ray, 4 ... Color issue sheet, 5 ... Color CCD camera, 6 ... Arithmetic processing device, 7 ... Display device, 8 ... Communication device, 9 ... Monitor camera, 10 ... Sheet base material, 11 ... Phosphor layer, 12 ... Protective film, 13 ... Drum can, 14 ... Conveyor, 15 ... Turntable, 16 ... Piping, 17 ... Head, 18 ... Unit, 19 ... Pole, 20 ... Remote control Location: 21 ... computer, 22 ... collimator, 23 ... stand, 24 ... working stand, 25 ... mirror, 26 ... zoom lens.

Claims (4)

A radiation source that irradiates radiation onto a drum can integrally provided with an angle discrimination mark on the outer peripheral surface, and a radiation source that is irradiated from the radiation source is disposed at a position where the radiation passes through the subject. A color light emitting sheet having phosphors that emit light in color and have different ratios of light emission of the plurality of colors with respect to radiation of the same intensity; a color CCD camera that is provided behind the color light emission sheet and receives the light emission of the plurality of colors; a processing unit for detecting the respective image information including a plurality of color signals received by the color CCD camera as a single image information of each color is separated into RGB signals, the radiation source while rotating the drum, radiation and color luminescent radiation nondestructive testing instrumentation of drums comprising a moving means for moving the relative continuously for at least one sheet A radiographic non-destructive inspection method using, performs imaging in the color CCD camera while rotating the drum with the moving means, the orientation of the drum to be moved by the moving means by detecting the label A radiation nondestructive inspection method characterized by discriminating.   The radiation nondestructive inspection method according to claim 1, wherein a three-dimensional image is obtained by performing image reconstruction processing from a color image captured by moving the drum relative to radiation.   The position or movement of the sign attached to the drum can when displaying an external appearance image of the drum can and an image obtained by separating and detecting light emission of a plurality of colors emitted from a phosphor based on radiation. The radiation nondestructive inspection method according to claim 1, wherein an amount is displayed.   The radiation nondestructive inspection method according to claim 1, wherein the sign is read from an appearance image of the drum, and the feature, inspection position, or movement amount of the drum is displayed.

Images