JP2024015710A - Property inspection device - Google Patents

Abstract

An object of the present invention is to provide a belongings inspection device that can reduce oversight of small belongings and improve the detection rate of belongings. The belongings inspection device is of a passive type that receives black body radiation 2 emitted from an object, converts it into an image, and inspects the belongings. Black body radiation was reflected by a polygon mirror 3 having a plurality of reflecting mirrors 4 and 5 of different sizes, and the reflected black body radiation was collected by a single condensing mirror 6 and made incident on a detector 9, where it was detected. It is characterized by inspecting belongings by combining images with different pixel sizes. By performing composite image processing that combines images with different pixel sizes (resolutions) and aligning the pixel sizes of the images, it is possible to reduce the chance of overlooking small items, and improve the detection rate of dangerous objects such as knives, firearms, and explosives. can be improved. [Selection diagram] Figure 1

Description

The present invention relates to a passive property inspection device that receives black body radiation (thermal noise) emitted from an object, converts it into an image, and inspects the property.

Techniques for receiving blackbody radiation emitted from objects and creating images are used in astronomical observations, etc. Products that apply black body radiation images to security body scanners are also known. For example, Patent Document 1 describes a passive millimeter-wave imaging device and a captured image display device that captures an image of a subject by receiving millimeter-wave band thermal noise emitted from a human body, which is the subject. .

Japanese Patent Application Publication No. 2012-21954

By the way, the passive type device as described in Patent Document 1 has a trade-off problem between reception strength and pixel size (resolution). In other words, the intensity of the received blackbody radiation is proportional to the size of the polygon mirror and the condensing mirror, but the pixel size is also proportional to the mirror size, so there is a trade-off between the received intensity and resolution. . Furthermore, when scanning with a polygon mirror, the pixel size also changes depending on the vertical angle, so the received intensity and resolution differ, resulting in non-uniformity of the captured image.

For this reason, in the inspection of belongings, there are problems in that small belongings may be overlooked or the detection rate of belongings may be reduced.

The present invention has been made in view of the above circumstances, and its purpose is to provide a belongings inspection device that can reduce the oversight of small belongings and improve the detection rate of belongings. .

A belongings inspection device according to one aspect of the present invention is a passive belongings inspection device that receives black body radiation emitted from an object, converts it into an image, and inspects the belongings, and uses the black body radiation to The reflected black body radiation is reflected by a polygon mirror with multiple reflecting mirrors with different values, and the reflected black body radiation is focused by a single condensing mirror and incident on a detector, and the detected images with different pixel sizes are synthesized and possessed. Characterized by inspecting something.

In the belongings inspection device of the present invention, a polygon mirror is provided with a plurality of reflecting mirrors of different sizes to reflect black body radiation, the light is focused by a single condensing mirror and detected by a detector, and the black body radiation is detected by a detector. Composite images. Through this compositing process, it is possible to suppress image distortion by aligning the pixel sizes of images with different pixel sizes reflected by mirrors of different sizes, reduce the oversight of small belongings, and improve the detection rate of belongings. .

1 is a schematic configuration diagram of a belongings inspection device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a component in the belongings inspection device shown in FIG. 1 that guides blackbody radiation emitted from an object to an antenna using a reflecting mirror having different sizes of polygon mirrors. FIG. 2 is a schematic configuration diagram when the belongings inspection device shown in FIG. 1 is made into a walk-through type. FIG. 4 is a plan view of FIG. 3 viewed from above. FIG. 5 is a diagram for explaining a configuration example of a sensor unit in the belongings inspection device shown in FIGS. 3 and 4. FIG. FIG. 5 is a diagram showing the relationship between an image and resolution when the entrance of a human body is detected by the belongings inspection device shown in FIGS. 3 and 4. FIG. 6 is a flowchart for explaining the operation of the walk-through type belongings inspection device shown in FIGS. 3 to 5. FIG. 8 is a flowchart for explaining the operation following FIG. 7. FIG. FIG. 3 is a diagram for explaining a pixel arrangement of an image generated by a first reflecting mirror. FIG. 6 is a diagram for explaining a pixel arrangement of an image generated by a second reflecting mirror. FIG. 6 is a diagram for explaining a pixel arrangement of an image that is a combination of an image obtained by a first reflecting mirror and an image obtained by a second reflecting mirror. FIG. 6 is a diagram showing a detected image and a composite image in the walk-through type belongings inspection device shown in FIGS. 3 to 5. FIG. FIG. 3 is a perspective view showing another configuration example of a polygon mirror in the belongings inspection device according to the embodiment of the present invention. It is a perspective view showing still another example of composition of a polygon mirror in a belongings inspection device concerning an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a belongings inspection device according to an embodiment of the present invention. In addition, FIG. 2 shows a component in the belongings inspection device shown in FIG. When black body radiation is reflected by a large-sized first reflecting mirror, Figure (b) shows a case where black-body radiation is reflected by a small-sized second reflecting mirror.

As shown in FIG. 1, the belongings inspection device detects blackbody radiation 2 emitted from a human body 1, which is a subject, by scanning it with a polygon mirror 3 that rotates at high speed. As shown in FIGS. 2(a) and 2(b), for example, the polygon mirror 3 includes a large-sized first reflecting mirror 4 and a small-sized first reflecting mirror 4 on the surface of a disk 3a that rotates at high speed along the central axis AX1. Two reflecting mirrors 5 are attached. The first reflecting mirror 4 is formed by vapor deposition or the like on the upper surface of a cylindrical base 4a standing upright on the surface of the disk 3a. As shown in FIG. 2A, the first reflecting mirror 4 is inclined at a predetermined angle with respect to the surface of the disk 3a, and reflects the black body radiation 2 toward the condensing mirror 6.

Similarly, the second reflecting mirror 5 is formed by vapor deposition or the like on the upper surface of a cylindrical base 5a standing upright on the surface of the disk 3a. This second reflecting mirror 5 is also inclined at a predetermined angle with respect to the surface of the disk 3a, as shown in FIG. 2(b), and reflects the black body radiation 2 toward the condensing mirror 6.
The sizes of the first reflecting mirror 4 and the second reflecting mirror 5 are preferably set so that the difference in pixel size is about twice. For example, the size ratio of the first reflecting mirror 4 and the second reflecting mirror 5 is twice (the area ratio is four times). Further, the rotation speed of the polygon mirror 3 is preferably determined according to the pixel density of the first reflecting mirror 4 and the second reflecting mirror 5.

The black body radiation 2 reflected by the polygon mirror 3 is guided by a condensing mirror 6 to an antenna (horn antenna) 7 and received. Since the resolution is determined by the amount of energy of the black body radiation 2 guided to the condensing mirror 6, the received intensity of the black body radiation 2 reflected by the first reflecting mirror 4 is equal to the received intensity of the black body radiation 2 reflected by the second reflecting mirror 5. Higher (stronger) than radiation 2. On the other hand, the resolution of the black body radiation 2 reflected by the first reflecting mirror 4 is lower (weaker) than that of the black body radiation 2 reflected by the second reflecting mirror 5.

The black body radiation 2 received by the antenna 7 is amplified by the amplifier 8, and then input to the detector 9 and detected. The detection result by the detector 9 is input to the processing unit 10, and images with different pixel sizes are combined. Through this synthesis process, the pixel sizes of the images reflected by the reflecting mirrors 4 and 5 of different sizes are made equal. Specifically, the pixel size of the image formed by reflecting the black body radiation 2 by the first reflecting mirror 4 is small, and the pixel size of the image formed by reflecting the black body radiation 2 by the second reflecting mirror 5. Image distortion is suppressed by combining and compositing areas with large values. Based on the result of this synthesis process, when the processing unit 10 detects a dangerous object such as a knife, firearm, or explosive, it notifies the host device of the process result.

Alternatively, the synthesized image is displayed on the display device 11, and when the inspector detects a dangerous object such as a knife, firearm, or explosive from the processing result or the displayed image, the alarm device 12 or the like is activated to alert the surrounding area. do.

Note that the sampling rate of the image in the processing unit 10 may be adjusted to the specifications of image synthesis in which each pixel is combined. Furthermore, the resolution can be improved by performing the imaging process for each of the first and second reflecting mirrors 4 and 5 in a time-division manner. In addition, detection accuracy can be improved by also using a composite image obtained by combining pixels acquired by each of the reflecting mirrors 4 and 5 for determination.

FIG. 3 shows an example of the configuration of the belongings inspection device in FIG. 1 in a walk-through type. 4 is a plan view of FIG. 3 viewed from above. Sensor units 21-1 to 21-4 are arranged on the front left and right sides and the rear left and right sides of the passageway 20 shown by arrows in FIGS. 3 and 4, respectively. The black body radiation 2 of the object is detected, and the belongings are inspected based on the detected black body radiation 2. These sensor units 21-1 to 21-4 each include upper units 21-1a to 21-4a and lower units 21-1b to 21-4b.

The sensor unit 21-1 arranged at the left front of the human body 1 detects the left half of the front of the human body 1 when the human body 1 is located between the sensor units 21-1 to 21-4, and detects the left half of the front of the human body 1. The sensor unit 21-2 located at the front detects the right half of the front of the human body 1. On the other hand, the sensor unit 21-3 placed at the rear left of the human body 1 detects the left half of the back of the human body 1 when the human body 1 is located between the sensor units 21-1 to 21-4. The sensor unit 21-4 located on the right rear side of the human body 1 detects the left half of the back of the human body 1.
Then, the black body radiation 2 detected by the sensor units 21-1 to 21-4 described above is processed into a composite image, and the belongings are inspected.

FIG. 5 is a diagram for explaining a configuration example of a sensor unit in the belongings inspection apparatus shown in FIGS. 3 and 4. FIG. Here, the configuration of the sensor unit 21-1 is representatively shown, but the sensor units 21-2 to 21-4 are also configured in the same way. The sensor unit 21-1 includes an upper sensor 21-1a that detects the upper left half of the front of the human body 1, and a lower sensor 21-1b that detects the lower left half of the front of the human body 1.

The upper sensor 21-1a includes a polygon mirror 3a, a condenser mirror 6a, an antenna 7a, an amplifier 8a, and a detector 9a. The polygon mirror 3a reflects the blackbody radiation 2a emitted from the upper left half of the front of the human body 1 and guides it to the condensing mirror 6a. By rotating the polygon mirror 3a, the upper left half of the front of the human body 1 is scanned in the vertical direction (vertical direction). The black body radiation 2a reflected by the condensing mirror 6a is received by an antenna 7a, amplified by an amplifier 8a, and then detected by a detector 9a.

Further, the lower sensor 21-1b includes a polygon mirror 3b, a condensing mirror 6b, an antenna 7b, an amplifier 8b, and a detector 9b. The polygon mirror 3b reflects the black body radiation 2b emitted from the lower left half of the front of the human body 1 and guides it to the condensing mirror 6b. By rotating the polygon mirror 3b, the lower left half of the front of the human body 1 is scanned in the vertical direction (up and down direction). The black body radiation 2b reflected by the condensing mirror 6b is received by the antenna 7b, amplified by the amplifier 8b, and then detected by the detector 9b.

Then, the detection outputs of the detectors 9a and 9b are input to the processing unit 10 and processed, and the detection results are displayed on the display device 11 as necessary, or when a dangerous object such as a knife, firearm, or explosive is detected. Then, the alarm device 12 notifies the surrounding area.
Note that by inputting the detection outputs of the detectors of the sensor units 21-2 to 21-4 to the processing unit 10 and processing them, belongings can be inspected from the front, back, left and right of the human body 1.

FIG. 6 shows the relationship between an image and resolution when the entrance of the human body 1 is detected by the belongings inspection apparatus of FIGS. 3 and 4, and is an image captured by vertical line scanning by two upper and lower units. The sensor unit 21-1 (upper sensor 21-1a and lower sensor 21-1b) captures an image of the front left half of the human body 1, and the sensor unit 21-2 (upper sensor 21-2a and lower sensor 21-2b) captures an image of the human body 1. An image of the right front half of 1 is captured. Although not shown, an image of the rear left half is similarly captured by the sensor unit 21-3 (upper sensor 21-3a and lower sensor 21-3b), and an image of the rear left half is captured by the sensor unit 21-4 (upper sensor 21-4a and lower sensor 21-3b). An image of the right half is captured by the sensor 21-4b).

In FIG. 6(a), the scanning ranges of the sensor units 21-1 and 21-2 are shown by broken lines, and the belongings in the upper and lower parts of these scanning ranges are the upper units 21-1a and 21-2a and the lower units. Detected by 21-1b and 21-2b.

FIG. 6(b) shows the resolution of the scan range of the image in FIG. 6(a) using circles (indicated by broken lines) 22 with different diameters in the vertical direction. has low resolution. In each of the sensor units 21-1a, 21-2a, 21-1b, and 21-2b, when the human body 1 is in front, the black body radiation 2 is incident on the polygon mirror 3 at an angle of 45 degrees, and the size of the circle 22 is As the angle becomes smaller (higher resolution) and the angle becomes tighter, the size of the circle 22 becomes larger (lower resolution). Further, distortion occurs in the circle 22 at both the upper and lower ends, and the circle 22 is deformed so as to be elongated in the vertical direction. Therefore, each sensor unit 21-1a, 21-2a, 21-1b, 21-2b has a high resolution at the center and a low resolution at both ends.

7 and 8 are flowcharts for explaining the operation of the walk-through personal belongings inspection device shown in FIGS. 3 to 5. Here, in order to simplify the explanation, the polygon mirror, condensing mirror, antenna, amplifier, detector, etc. are treated as one unit, but in reality, they are mounted on each of the sensor units 21-1 to 21-4. These parts and devices are provided in the sensors 21-1a to 21-4a and the lower sensors 21-1b to 21-4b.

When a person passes between the sensor units 21-3 and 21-4, the entry of the human body 1 is detected (step S1), and the polygon mirror 3 is rotationally driven (step S2). In steps S3 to S8, the mirror angle of the polygon mirror 3 is set sequentially from the upper limit to the lower limit, and the detection level of the black body radiation 2 reflected by the first reflecting mirror 4 of this polygon mirror 3 (detection level of the polygon mirror size) , the detection level of the black body radiation 2 reflected by the second reflecting mirror 5 (the detection level of the small polygon mirror) is obtained.

That is, in step S3, the mirror angle of the polygon mirror 3 is set to the upper limit, and the black body radiation 2 reflected by the first reflecting mirror 4 is collected by the condensing mirror 6, received by the antenna 7, and transmitted to the detector 9. is detected and processed and acquired by the processing unit 10. Similarly, the black body radiation 2 reflected by the second reflecting mirror 5 is detected by the detector 9 and acquired by the processing unit 10. In step S4, the mirror angle of the polygon mirror 3 is set to "upper limit -1", and the black body radiation 2 reflected by the first reflecting mirror 4 is detected by the detector 9 and acquired by the processing unit 10, The black body radiation 2 reflected by the second reflecting mirror 5 is detected by the detector 9 and acquired by the processing unit 10. In step S5, the mirror angle of the polygon mirror 3 is set to "upper limit -2", and the black body radiation 2 reflected by the first reflecting mirror 4 is detected by the detector 9 and acquired by the processing unit 10, The black body radiation 2 reflected by the second reflecting mirror 5 is detected by the detector 9 and acquired by the processing unit 10.

Thereafter, similarly, the mirror angle of the polygon mirror 3 is gradually lowered from the upper limit, and the black body radiation 2 reflected by the first reflecting mirror 4 is detected by the detector 9 and acquired by the processing unit 10, and the second The black body radiation 2 reflected by the reflecting mirror 5 is detected by the detector 9 and acquired by the processing unit 10 (step S6). In step S7, the mirror angle of the polygon mirror 3 is set to "lower limit -1", and the black body radiation 2 reflected by the first reflecting mirror 4 is detected by the detector 9 and acquired by the processing unit 10, The black body radiation 2 reflected by the second reflecting mirror 5 is detected by the detector 9 and acquired by the processing unit 10. Furthermore, in step S8, the mirror angle of the polygon mirror 3 is set to the "lower limit", and the black body radiation 2 reflected by the first reflecting mirror 4 is detected by the detector 9 and acquired by the processing unit 10, and the The black body radiation 2 reflected by the 2-reflector 5 is detected by the detector 9 and acquired by the processing unit 10.

In the next step S9, the detection results from the upper limit to the lower limit are stored in the current time sequence of the image array by the first reflecting mirror 4. FIG. 9 shows the image array by the first reflecting mirror 4 saved in step S9. The processing unit 10 stores "current time t", "t-1" before a predetermined time, "t-2" before a predetermined time, etc. The detection results obtained thereafter are stored at "t+1", further after a predetermined time "t+2", and so on.

"Current time" is determined from the image at the "upper limit" position by the large first reflecting mirror 4, "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", etc. Images up to the positions of "lower limit -4", "lower limit -3", "lower limit -2", "lower limit -1", and "lower limit" are saved. Further, at time "t-1", from the image of the "upper limit" position by the first reflecting mirror 4, "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", ... , "Lower limit-4," "Lower limit-3," "Lower limit-2," "Lower limit-1," and images up to the "Lower limit" positions are stored. Furthermore, at time "t-2", "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", . . . are determined from the image of the "upper limit" position by the first reflecting mirror 4. , "Lower limit-4," "Lower limit-3," "Lower limit-2," "Lower limit-1," and images up to the "Lower limit" positions are stored.

In step S10, the detection levels from the upper limit to the lower limit are similarly stored in the current time sequence of the image array by the second reflecting mirror 5. The image arrangement by the second reflecting mirror 5 saved in this step S10 is shown in FIG. In the processing unit 10, "t-1", which is a predetermined time before "current time t", "t-2", which is a predetermined time before, etc. is stored, and The detection results obtained thereafter are stored at "t+1" after a predetermined time, "t+2" after a predetermined time, and so on.

"Current time" is determined from the image at the "upper limit" position by the smaller second reflecting mirror 5, "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", etc. Images up to the positions of "lower limit -4", "lower limit -3", "lower limit -2", "lower limit -1", and "lower limit" are saved. Also, at time "t-1", from the image of the "upper limit" position by the second reflecting mirror 5, "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", ... , "Lower limit-4," "Lower limit-3," "Lower limit-2," "Lower limit-1," and images up to the "Lower limit" positions are saved. Further, at time "t-2", "upper limit -1", "upper limit -2", "upper limit -3", "upper limit -4", ... , "Lower limit-4," "Lower limit-3," "Lower limit-2," "Lower limit-1," and images up to the "Lower limit" positions are stored.

Thereafter, the detection levels of the second reflecting mirror 5 in the upper and lower parts and of the first reflecting mirror 4 in the central part are stored in the current time series of the image array (step S11). The image array of the second reflecting mirror 5 saved in this step S11 is shown in FIG. The processing unit 10 stores "current time t", "t-1" before a predetermined time, "t-2" before a predetermined time, etc. The detection results obtained thereafter are stored at "t+1", further after a predetermined time "t+2", and so on.

In the "current time", images from the "upper limit" position image taken by the second reflecting mirror 5 to the "upper limit -1", "upper limit -2", "upper limit -3", . . . positions are stored. Images captured by the first reflecting mirror 4 are stored at the positions of "Center+2", "Center+1", "Center", "Center-1", and "Center-2". Images obtained by the second reflecting mirror 5 are stored at the positions of "lower limit -3", "lower limit -2", "lower limit -1", and "lower limit".

In addition, the images by the second reflecting mirror 5 are stored at the "upper limit -1", "upper limit -2", "upper limit -3", ... positions of the time "t-1", "center +2", "center The images from the first reflecting mirror 4 are stored at the positions of ``+1'', ``center'', ``center-1'', and ``center-2'', and ``lower limit -3'', ``lower limit -2'', and ``lower limit -1''. ” and the “lower limit” position, the image taken by the second reflecting mirror 5 is stored.

Furthermore, the images from the second reflecting mirror 5 are stored at the "upper limit -1", "upper limit -2", "upper limit -3", ... positions of the time "t-2", and the images are stored at the "center+2", "center The images from the first reflecting mirror 4 are stored at the positions of ``+1'', ``center'', ``center-1'', and ``center-2'', and ``lower limit -3'', ``lower limit -2'', and ``lower limit -1''. ” and the “lower limit” position, the image taken by the second reflecting mirror 5 is stored.

Next, it is determined whether or not a person has passed between the sensor units 21-1 and 21-2 (step S12), and when the advance of the human body 1 is detected, image processing (edge detection), determination processing ( presence or absence), the result is notified to the host device, and the polygon mirror is stopped (step S13).

In the above image processing, for example, edge extraction is performed using the intensity difference of the images, and the presence or absence of the contour (edge) of belongings existing within the contour (edge) of the human body is processed and detected based on a rule. Alternatively, the image is passed through AI (deep learning, machine learning) to identify whether there is an item in the person's possessions or the type (eg, knife, etc.) of the item based on the characteristics of the item. Furthermore, processing using a combination of these may also be used.
On the other hand, if the advance of the human body 1 is not detected in step S12, the process returns to step S3 and the operations up to step S12 are repeated.

FIG. 12 shows an image of the detection output of the belongings inspection device shown in FIGS. 3 and 4. 12(a) is an image of pixels reflected by the first reflecting mirror 4 and focused by the condensing mirror 6, and FIG. 12(b) is an image of pixels reflected by the second reflecting mirror 5 and condensed by the condensing mirror 6. This is an image created by focused pixels. FIG. 12(c) shows a composite image of FIGS. 12(a) and (b). When the image of the center part by the first reflecting mirror 4 and the pixels of the upper and lower parts by the second reflecting mirror 5 are combined, as shown in FIG. An image is obtained by combining the image 23a formed by the pixels of the second reflecting mirror 5 and the image 23c formed by the pixels of the second reflecting mirror 5. As a result, an image with relatively similar pixel sizes (resolutions) is obtained.

In this way, by combining the image taken by the first reflecting mirror 4, which has a low resolution but has a strong receiving strength of the black body radiation 2, with the image taken by the second reflecting mirror 5, which has a weak receiving strength but a high resolution, the black body radiation 2 It is possible to simultaneously capture a low-resolution image with high intensity and a high-resolution image with low intensity. By combining these images, it is possible to synthesize an image with a somewhat uniform pixel size. This results in an image with uniform intensity of black body radiation 2, which also leads to improved resolution.

Therefore, according to the present invention, by compositing images with different pixel sizes to make the pixel sizes the same, it is possible to suppress image distortion, reduce overlooking of small belongings, and also reduce the possibility of overlooking small belongings, such as knives, firearms, explosives, etc. The detection rate of dangerous objects can be improved. Moreover, the number of parts can be reduced and costs can be reduced compared to providing a polygon mirror for each pixel size.

FIG. 13 is a perspective view showing another example of the configuration of the polygon mirror in the belongings inspection device of the present invention. This polygon mirror 30 has a hexagonal truncated pyramid shape, and a plurality of reflecting mirrors of different sizes are installed on the sides of the trapezoid. In this example, two types of large and small reflecting mirrors 31-1 to 31-3 and 32-1 to 32-3 are provided alternately so that adjacent mirrors have different sizes. These reflecting mirrors 31-1 to 31-3 and reflecting mirrors 32-1 to 32-3 are arranged so that the pixel sizes are about twice as different, for example, each of the reflecting mirrors 31-1 to 31-3 and each reflecting mirror 32-1 to 32-3 are The size ratio of the mirrors 32-1 to 32-3 is twice (the area ratio is four times).

By rotating this polygon mirror 30 along the central axis AX2, black body radiation is condensed by a condensing mirror (not shown).
By using such a polygon mirror 30 in place of the polygon mirror 3 in FIG. 2, the same effects as in the embodiment described above can be obtained.
In addition, in FIG. 13, the case where the polygon mirror is in the shape of a hexagonal truncated pyramid is explained as an example, but it may also be a square truncated pyramid, an octagonal truncated pyramid, or more. It is also possible to provide two types of reflecting mirrors, one large and one small, such as two or four.

FIG. 14 is a perspective view showing still another configuration example of the polygon mirror in the belongings inspection device of the present invention. This polygon mirror 40, similar to the polygon mirror shown in FIG. Mirrors 42-1 to 42-4 are provided. These reflecting mirrors 41-1 to 41-4 and reflecting mirrors 42-1 to 42-4 are arranged so that the pixel sizes are approximately twice as different, for example, each reflecting mirror 41-1 to 41-4 and each reflecting mirror 42-1 to 42-4 are The size ratio of each of the mirrors 42-1 to 42-4 is twice (the area ratio is four times).

By also rotating this polygon mirror along the central axis AX3, black body radiation is condensed by a condensing mirror (not shown).
Of course, by using such a polygon mirror 40 in place of the polygon mirror shown in FIG. 2, the same effects as in the embodiment described above can be obtained.
In addition, in FIG. 14, the polygon mirror 40 is provided with four large reflecting mirrors 41-1 to 41-4 and four small reflecting mirrors 42-1 to 42-4, but it is also possible to provide three each, or five each. Needless to say, more than one may be provided.

The configurations, operating procedures, etc. described in the above embodiments are merely shown schematically to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the embodiments described, but can be modified in various forms without departing from the scope of the technical idea indicated in the claims.

For example, the portion to be synthesized may be changed depending on the position or height of the person passing through. In other words, the detection rate of dangerous objects can be increased by increasing the resolution and reception strength of areas where there is a high possibility of hiding dangerous objects.
Furthermore, although the explanation has been given using an example in which the pixel sizes of the first reflecting mirror and the second reflecting mirror are about twice as different, the difference is not limited to twice.
Further, although two types of reflecting mirrors, large and small, are provided, three or more types of reflecting mirrors of different sizes may be provided to receive black body radiation, convert it into an image, and synthesize it.

1... Human body, 2, 2a, 2b... Black body radiation, 3, 3a, 3b, 30, 40... Polygon mirror, 3a, 40a... Disc, 4, 31-1 to 31-3, 41-1 to 41-4 ...First reflecting mirror, 5, 32-1 to 32-3, 42-1 to 42-4... Second reflecting mirror, 4a, 5a... Base, 6, 6a, 6b... Condensing mirror, 7, 7a, 7b... Antenna, 8, 8a, 8b... Amplifier, 9, 9a, 9b... Detector, 10... Processing section, 11... Display device, 12... Alarm device, 20... Passage, 21-1 to 21-4... Sensor unit , 21-1a to 21-4a...upper unit, 21-1b to 21-4b...lower unit, 22...circle (resolution), 23a, 23b, 23c...image, AX1 to AX3...center axis

Claims (4)

A passive belongings inspection device that receives black body radiation emitted from an object and converts it into an image to inspect belongings,
The black body radiation is reflected by a polygon mirror having a plurality of reflecting mirrors of different sizes, and the reflected black body radiation is focused by a single condensing mirror and incident on a detector, thereby detecting images with different pixel sizes. A belongings inspection device is characterized in that the belongings are inspected by performing a synthesis process. Each of the plurality of reflecting mirrors of different sizes is installed on the surface of a disk rotating about a central axis, and is set at a predetermined inclination angle to reflect the black body radiation and guide it to the condensing mirror. The belongings inspection device according to claim 1. The process of combining images with different pixel sizes detected by the detector involves extracting a region with a small pixel size generated by a large reflecting mirror and an area with a large pixel size generated by a small reflecting mirror. The belongings inspection device according to claim 1 or 2, wherein the belongings inspection device is a device for synthesizing. 2. When a dangerous substance is detected through the inspection of the belongings, the processing result is notified to a host device, the processing result is displayed on a display device, or the processing result is notified to the surroundings. Property inspection device.