Imaging detection device

Abstract

The utility model provides an imaging detection device. The imaging detection device comprises a connection module, and a back scattering module and an expansion module which are connected through the connection module, the back scattering module comprises a radiation source and a detection unit; the expansion module comprises at least one expansion detection unit, and the transverse size and the longitudinal size of the expansion detection unit are not smaller than the detection threshold size; the position state of the expansion module comprises a back scattering detection state and a transmission detection state; the connection module comprises a state conversion structure used for converting the position state of the expansion module and a circuit used for connecting the back scattering module and the expansion module. Wherein the detection threshold size is the minimum size for receiving a flying spot ray beam when the expansion detection unit performs transmission application under a specific imaging distance, so that the expansion detection unit can absorb more ray beam energy, and the ray beam receiving efficiency of the imaging detection device is effectively improved; therefore, the signal-to-noise ratio of an image signal detected by the imaging detection device is improved, and the transmission depth is improved while the resolution ratio is effectively maintained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of radiation detection, and relates to a backscattering detection technology, in particular to an imaging detection device. BACKGROUND

[0002] The backscattering detection technology is a detection method for identifying and analyzing the composition of a detected object by detecting the rays scattered at a large angle after interacting with the detected object. The backscattering detection technology has high practical application value in the imaging field of detecting explosives, drugs and other substances.

[0003] Since the backscattering detection technology generally needs to use a low-dose-rate imaging method, the radiation dose used in the imaging process is low, which reduces the radiation damage to the detected object and the radiation exposure to the operator, and has high safety. However, the radiation dose absorbed by the detection unit is small, it is difficult to obtain a high image signal-to-noise ratio, and the effective transmission depth is small during the backscattering detection imaging process, so that the deep-layer objects or components in the detected object are difficult to be detected, which affects the final detection effect. At the same time, in the detection of metal objects, the detection effect of the backscattering detection technology is not as good as that of the transmission detection technology.

[0004] Therefore, how to further improve the detection effect of backscattering detection is an urgent problem to be solved by those skilled in the art. SUMMARY

[0005] The present application aims to provide an imaging detection device to solve the problem that in the existing backscattering detection technology, due to the use of a low-dose-rate imaging method, the radiation dose absorbed by the detection unit is small, it is difficult to obtain a high image signal-to-noise ratio and a large effective transmission depth, the detection effect is not good, and the detection effect in the detection of metal objects is not as good as that of the transmission detection technology.

[0006] In a first aspect, the present application provides an imaging detection device, comprising a connection module, and a backscattering module and an expansion module connected through the connection module.

[0007] The backscattering module comprises a ray source and a detection unit, and the detection unit is on the same side of the detected object as the ray source. The ray source emits a flying spot ray beam to irradiate the detected object. The scattered beam of the detected object after being irradiated by the ray source forms a backscattering beam. The detection unit is arranged in the beam range covered by the backscattering beam to receive and process the backscattering beam to form a detection image.

[0008] The expansion module comprises at least one expansion detection unit, the lateral dimension and the longitudinal dimension of the expansion detection unit are not less than a detection threshold dimension; the position state of the expansion module comprises a backscattering detection state and a transmission detection state, when the position state is the backscattering detection state, the expansion module is located at the same side of the detected object as the detection unit, when the position state is the transmission detection state, the expansion module is located at the opposite sides of the detected object as the detection unit;

[0009] The connection module comprises a state conversion structure for converting the position state of the expansion module and a circuit line for connecting the backscattering module and the expansion module;

[0010] The detection threshold dimension is the minimum size of the flying point ray beam when the position state of the expansion detection unit is the transmission detection state.

[0011] In the present application, by adding the expansion module, the imaging detection device can realize backscattering detection imaging and transmission detection imaging at the same time, so as to realize the detection of explosives, drugs and other substances while accurately detecting guns, knives and other objects, thereby improving the detection safety. At the same time, by setting the lateral dimension and the longitudinal dimension of the expansion detection unit to be not less than the detection threshold dimension, the efficiency of the detection device receiving the ray beam in transmission application is effectively improved, thereby improving the signal-to-noise ratio and the effective transmission depth of the transmission image, and better detection effect is realized; and the expansion detector can further improve the area of the backscattering detector when used as a backscattering application, thereby improving the reception efficiency of the backscattering signal and further improving the detection effect of the backscattering imaging.

[0012] In an embodiment of the present application, the expansion module is rectangular; the expansion module comprises a plurality of expansion detection units arranged in sequence and closely in the lateral direction; the longitudinal dimension of the expansion module is the longitudinal dimension of the expansion detection unit; and the lateral dimension of the expansion module is the sum of the lateral dimensions of all the expansion detection units.

[0013] The lateral dimension of the expansion module is not less than a receiving threshold dimension; wherein the receiving threshold dimension is the minimum size of the flying point ray beam scanning range covered by the expansion module.

[0014] In an embodiment of the present application, the expansion module is rectangular; the expansion module comprises one expansion detection unit; and the lateral dimension of the expansion module is the lateral dimension of the expansion detection unit.

[0015] The lateral dimension of the expansion module is not less than a receiving threshold dimension; wherein the receiving threshold dimension is the minimum size of the flying point ray beam scanning range covered by the expansion module.

[0016] In an embodiment of the present application, the extended detection unit comprises at least one of a high-energy detection assembly and a low-energy detection assembly.

[0017] In an embodiment of the present application, the extended detection unit comprises a high-energy detection assembly and a low-energy detection assembly; the low-energy detection assembly is located between the high-energy detection assembly and the detected object.

[0018] In an embodiment of the present application, the extended detection unit further comprises an optical filter located between the high-energy detection assembly and the low-energy detection assembly.

[0019] In an embodiment of the present application, the high-energy detection assembly comprises a high-energy scintillator; the low-energy detection assembly comprises a low-energy scintillator; wherein the material of the high-energy scintillator is the same as the material of the low-energy scintillator; or the material of the high-energy scintillator is different from the material of the low-energy scintillator.

[0020] In an embodiment of the present application, the high-energy detection assembly further comprises a total reflection light cone and a high-energy photoelectric sensor arranged in sequence on the side of the high-energy scintillator away from the detected object, wherein the high-energy scintillator is tightly attached to the total reflection light cone, and the total reflection light cone is tightly attached to the high-energy photoelectric sensor, so as to transmit the optical signal generated by the high-energy scintillator to the high-energy photoelectric sensor through the total reflection light cone to generate an electrical signal;

[0021] The low-energy detection assembly further comprises a low-energy photoelectric sensor arranged on the low-energy scintillator perpendicular to the direction of the flying spot beam, and the low-energy scintillator is tightly attached to the low-energy photoelectric sensor, so as to transmit the optical signal generated by the low-energy scintillator to the low-energy photoelectric sensor to generate an electrical signal.

[0022] In an embodiment of the present application, the state conversion structure comprises a ball joint structure or a rotating shaft connection structure, the moving end of the state conversion structure is fixedly connected with the extended module, and the state conversion structure is used to realize the conversion of the position state of the extended module.

[0023] In an embodiment of the present application, the backscattering module further comprises a positioning radiation source, and the positioning radiation source emits radiation to determine the position of the extended module.

[0024] As described above, the application provides an imaging detection device, by setting the lateral size and longitudinal size of the extended detection unit not less than the detection threshold size, the area of the extended detection unit is expanded, so as to ensure that the beam energy of the flying spot beam will not be lost due to the inability of the interface between the extended detection units to absorb the beam, thereby improving the beam energy received by the extended detection unit, and effectively improving the efficiency of the extended module receiving the beam. And under the same area, the number of extended detection units in the application is less, the noise is also reduced, the signal-to-noise ratio of the obtained image is improved, and the imaging detection device achieves better detection effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The imaging detection device structure schematic diagram of the extended module described in the embodiment of the application is shown in the backscattering detection state.

[0026] Figure 2 The imaging detection device structure schematic diagram of the extended module described in the embodiment of the application is shown in the transmission detection state.

[0027] Figure 3 The structure schematic diagram of the extended module described in the embodiment of the application is shown.

[0028] Figure 4 The structure schematic diagram of the extended module described in the embodiment of the application is shown.

[0029] Figure 5 The structure schematic diagram of the extended detection unit described in the embodiment of the application is shown.

[0030] Figure 6 The structure schematic diagram of the rotating part described in the embodiment of the application is shown.

[0031] Figure 7 The structure schematic diagram of the rotating part described in the embodiment of the application is shown.

[0032] Element number explanation

[0033] 100 backscattering module

[0034] 110 detection unit

[0035] 200 extended module

[0036] 210 extended detection unit

[0037] 211 beam receiver

[0038] 212 photoelectric sensor

[0039] 213 signal readout

[0040] 220 Low-Energy Detection Components

[0041] 221 Low-energy scintillator

[0042] 222 Low-energy photoelectric sensor

[0043] 223 Low-energy signal reader

[0044] 230 High Energy Detection Components

[0045] 231 High-energy scintillator

[0046] 232 High-energy photoelectric sensor

[0047] 233 High-energy signal reader

[0048] 234 Total Internal Reflection Cone

[0049] 240 filter

[0050] 300 connection module

[0051] 310 State Transition Structure

[0052] 311 Rotating part

[0053] 3111 Ball Joint Connector

[0054] 3112 Restricted Body

[0055] 3113 Connecting base

[0056] 3114 Locking screw

[0057] 3115 Fixing Screw

[0058] 3116 First Connector

[0059] 3117 Second Connector

[0060] 3118 Shaft

[0061] 400 objects to be detected Detailed Implementation

[0062] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0063] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the component layout pattern can also be more complex.

[0064] The following embodiments of the present application provide an imaging detection device. Since the dose of the beam received by the detector pixel is small in the backscattering detection imaging process of the low dose rate imaging, the signal-to-noise ratio of the image obtained by detection is small, and the composition of the deep layer of the detected object is received by detection. Based on this, the imaging detection device provided by the present application increases the area of the backscattering detection device receiving the beam by adding an extended detection module to the backscattering detection device. At the same time, by setting the size of the extended detection unit in the extended detection module, the efficiency of the backscattering detection device receiving the backscattering beam is effectively improved, thereby improving the signal-to-noise ratio and effective transmission depth of the image detected by the imaging detection device, and improving the detection effect of the backscattering detection device on the detected object. The effective transmission depth in the present embodiment refers to the depth of the beam penetrating the material that can be detected by the detector.

[0065] The principles and implementation manners of the imaging detection device of the present embodiment will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the imaging detection device of the present embodiment without creative labor.

[0066] As shown in Figures 1-2 The present embodiment provides an imaging detection device, which comprises a connection module 300, and a backscattering module 100 and an extended module 200 connected through the connection module 300. The backscattering module 100 comprises a ray source (not shown in the figure) and a detection unit 110, as shown in Figure 2 The detection unit 110 is on the same side of the detected object 400 as the ray source; specifically, the ray source emits a flying spot beam, the flying spot beam is incident on the detected object, and the beam scattered by the detected object after being irradiated by the ray source forms a backscattering beam; the detection unit 110 is arranged in the beam range covered by the backscattering beam to receive and process the backscattering beam to form a detection image. It should be noted that since the area of the detection unit 110 is limited, it can only receive part of the scattered beam.

[0067] The extended module 200 comprises at least one extended detection unit 210, which can be used to receive the beam emitted by the detected object 400, thereby increasing the area of the imaging detection device receiving the backscattering beam, thereby increasing the number of beams detected by the imaging detection device, thereby improving the signal-to-noise ratio of the image formed by the imaging detection device and the effective transmission depth of the detected object 400. As shown in Figure 3As shown, the expanded detection unit includes a wire harness receiver 211 for receiving the wire harness and at least one photoelectric sensor 212 for converting the optical signal into an electrical signal. Further, the lateral dimension and the longitudinal dimension of the expanded detection unit 210 are not less than a detection threshold dimension, which is the minimum size for the detection expanded unit 121 to receive the spot beam from the ray source, i.e., the expanded detection unit 210 can at least receive a complete wire harness, which refers to a single wire harness when the single spot beam is incident on the detected object 400 and then emitted. It should be noted that a single expanded detection unit 210 is a pixel of the expanded module 200, i.e., the smallest unit for receiving the wire harness. Generally, the device for detecting imaging is usually composed of multiple pixels. Since the boundary between the pixels cannot receive the wire harness, it will affect the overall efficiency of the device for receiving the wire harness, and further affect the imaging effect. At the same time, the single pixel contains a complete structure for receiving the wire harness and forming a transmission signal based on the wire harness and transmitting to the imaging system. In the process of receiving the wire harness, a certain amount of noise will be generated. In the case that the received wire harness remains constant, the more the pixels, the greater the noise generated, and further affecting the signal-to-noise ratio of the obtained image. Especially for backscattering imaging, which is a low dose rate imaging, since the total amount of wire harness that can be received is small, when the number of pixels is greater, the noise generated is greater, and the signal-to-noise ratio of the obtained image is smaller.

[0068] Based on this, in the embodiment, the lateral dimension and the longitudinal dimension of the expanded detection unit 210 are not less than the detection threshold dimension, thereby reducing the number of expanded detection units 210 in a unit area, and the expanded detection unit 210 can receive a complete wire harness, which ensures that the expanded detection unit can receive all the energy of the single wire harness emitted by the detected object 400, effectively improves the efficiency of the expanded module 200 for receiving the wire harness and the signal-to-noise ratio of the obtained image, and further obtains a better detection effect.

[0069] In some optional embodiments, as Figure 3As shown, the expansion module 200 includes a plurality of expansion detection units 210 arranged in sequence in the lateral direction, i.e., the expansion module 200 includes a single-row structure composed of the plurality of expansion detection units 210, wherein the longitudinal dimension of the expansion module 200 is the longitudinal dimension of the expansion detection unit 210, and the lateral dimension of the expansion module 200 is the sum of the lateral dimensions of all the expansion detection units 210. Based on this, the expansion module 200 is a long rectangular, which can reduce the mass and volume of the expansion module, thereby facilitating the practical application of the imaging detection device. Specifically, the imaging detection device is a handheld imaging detection device, and the expansion module 200 includes a plurality of expansion detection units 210 arranged in sequence in the lateral direction, thereby reducing the weight of the handheld imaging detection device and improving the portability of the handheld imaging detection device. When the height of the detected object 400 is large, the imaging detection device can be moved in the vertical direction to realize detection of the entire detected object 400.

[0070] It should be noted that the lateral dimension of the expansion module 200 is not less than a receiving threshold dimension, wherein the receiving threshold dimension is the minimum dimension of the expansion module 200 covering the flying spot beam scanning range, so that the expansion module 200 can receive all the beams emitted by the detected object 400.

[0071] Further, as shown in Figure 4 , the expansion module 200 includes a single expansion detection unit 210, and the expansion detection unit 210 is a long rectangular, wherein the longitudinal dimension of the expansion module 200 is the longitudinal dimension of the expansion detection unit 210, and the lateral dimension of the expansion module 200 is the lateral dimension of the expansion detection unit 210. Based on this, the number of expansion detection units 210 can be further reduced, thereby further improving the efficiency of the expansion module 200 in receiving beams and the signal-to-noise ratio of the acquired image.

[0072] It should be noted that the single expansion detection unit 210 of the present embodiment includes a plurality of photoelectric sensors 212, as shown in Figure 4 each photoelectric sensor 212 converts the optical signal generated by the beam received by the different region of the expansion detection unit into an electrical signal. Based on this, in the present embodiment, the resolution of the backscattering image acquired by the imaging detection device does not decrease due to the reduction in the number of expansion detection units 210. In fact, the resolution of the backscattering image acquired by the imaging detection device is only related to the spot size of the flying spot beam on the detected object 400 under a determined imaging distance. The smaller the diameter of the spot, the higher the resolution of the acquired image.

[0073] Further, the expansion detection unit 210 further includes a signal reader 213 for reading and transmitting the electrical signal generated by the photoelectric sensor 212 to generate a detection image.

[0074] In some optional embodiments, the extended detection unit 210 includes at least one of a high-energy detection component 230 and a low-energy detection component 220, wherein the high-energy detection component 230 and the low-energy detection component 220 receive different ranges of wire harness energy. Specifically, the low-energy detection component 220 includes a low-energy scintillator 221 for receiving the wire harness and a low-energy photoelectric sensor 222 for converting an optical signal into an electrical signal. The low-energy scintillator 221 and the low-energy photoelectric sensor 222 are closely fitted together to transmit the optical signal generated by the low-energy scintillator 221 to the low-energy photoelectric sensor 222 to generate an electrical signal. The high-energy detection component 230 includes a high-energy scintillator 231 for receiving the wire harness and a high-energy photoelectric sensor 232 for converting an optical signal into an electrical signal. The high-energy scintillator 231 and the high-energy photoelectric sensor 232 are closely fitted together to transmit the optical signal generated by the high-energy scintillator 231 to the high-energy photoelectric sensor 232 to generate an electrical signal. It should be noted that the material of the high-energy scintillator 232 can be the same as or different from that of the low-energy scintillator 222. For example, the low-energy scintillator 222 is a plastic scintillator with a thickness ranging from 2 to 4 mm; the high-energy scintillator 232 is an inorganic scintillator with stronger absorption capacity for wire harnesses and a thickness ranging from 0.8 mm to 1.5 mm.

[0075] Furthermore, the high-energy detection component 230 and the low-energy detection component 220 also include signal reader for reading out the electrical signal generated by the photoelectric sensor. Specifically, the low-energy detection component 220 includes a low-energy signal readout unit 223, and the high-energy detection component 230 includes a high-energy signal readout unit 233.

[0076] Preferably, such as Figure 5 As shown, the extended detection unit 210 includes a high-energy detection component 230 and a low-energy detection component 220. The difference in beam signals received by the high-energy detection component 230 and the low-energy detection component 220 is used to identify the density or equivalent atomic number range of each region of the object under test 400. It should be noted that after the flying-spot beam is scattered by the object under test 400, due to the different absorption and scattering abilities of different materials, the detection images acquired by the high-energy detection component 230 and the low-energy detection component 220 can display the distribution of different substances within the object under test 400. By combining and comparing the two images, pseudo-color can be assigned to the substances in each region of the object under test 400 based on the equivalent atomic number range, thereby achieving the identification of various substances.

[0077] Specifically, for a single point on the probe 400, its attenuation ratio to the high-energy beam and the low-energy beam is calculated. This ratio is used as the range of reduced atomic numbers for that point to distinguish the type of material at that point. For example, the attenuation ratio R of the high-energy beam and the low-energy beam is calculated as follows:

[0078]

[0079] wherein μ l is the attenuation coefficient of the point to the low-energy beam, μ h is the attenuation coefficient of the point to the high-energy beam, I ol is the intensity of the low-energy beam incident on the point, I l is the intensity of the low-energy beam emitted by the point, I oh is the intensity of the low-energy beam incident on the point, I h is the intensity of the low-energy beam emitted by the point.

[0080] Further, based on the recognition result of the density or the equivalent atomic number range of each region of the detected object 400, a color is given to the acquired image to acquire a pseudo-color image.

[0081] It should be noted that the low-energy detection assembly 220 is located between the high-energy detection assembly 230 and the detected object 400, that is, the low-energy detection assembly 220 is closer to the detected object, so that the beam first passes through the low-energy detection assembly 220, and the part not absorbed by the low-energy detection assembly 220 is incident on the high-energy detection assembly 230, so as to avoid the high-energy scintillator 232 absorbing all or most of the beam energy, affecting the detection effect of the low-energy detection assembly 220.

[0082] Further, the extended detection unit 210 further comprises a filter 240 located between the high-energy detection assembly 230 and the low-energy detection assembly 220, which absorbs part of the beam, so as to increase the difference between the beam signal intensities received by the high-energy detection assembly 230 and the low-energy detection assembly, and further more accurately identify the region of heavy elements or high density in the detected object 400, or improve the acquired equivalent atomic number range. Exemplarily, the material of the filter 240 can be aluminum, iron, copper or an alloy material thereof.

[0083] Preferably, since the low-energy detection assembly 220 and the high-energy detection assembly 230 are structures overlapped together, in order to avoid the blocking of the low-energy beam by the low-energy photodetector 222 and the low-energy signal readout 223 of the low-energy detection assembly 220 affecting the detection effect of the high-energy detection assembly 230, in the embodiment, the low-energy photodetector 222 of the low-energy detection assembly 220 adopts side coupling. Specifically, as shown in Figure 5 , the low-energy photodetector 222 is arranged on the side of the low-energy scintillator 221 perpendicular to the direction of the beam, that is, the low-energy photodetector 222 is arranged on the side of the low-energy scintillator 221 which does not receive the beam. Further, in order to transmit the optical signal formed by the low-energy scintillator 221 to the low-energy photodetector 222 located on the side, a reflective film is arranged on the side of the low-energy scintillator 221 close to the high-energy detection assembly 230, so as to reflect the optical signal to the low-energy photodetector 222.

[0084] Further, when the high-energy scintillator 231 has a large area, matching the high-energy photoelectric sensor 232 with the same large area will increase the production cost of the imaging detection device. Based on this, in some optional embodiments, the high-energy detection assembly 230 further comprises a total reflection light cone 234 between the high-energy scintillator 231 and the high-energy photoelectric sensor 232, and the total reflection light cone 234 is used to transmit the light signal generated by the high-energy scintillator 231 to the high-energy photoelectric sensor 232 in the form of total reflection, for example, as shown in Figure 5 the cross section of the total reflection light cone 234 can be an isosceles trapezoid, so that the high-energy photoelectric sensor 232 with a small area can receive all the light signals generated by the high-energy scintillator 231 with a large area, thereby reducing the production cost of the imaging detection device. Of course, the total reflection light cone 234 can also be a total reflection light cone with other structures, as long as it can transmit the light signal to the high-energy photoelectric sensor 232 in the form of total reflection, which is not limited in the present application. It should be noted that the high-energy scintillator 231 is closely attached to the total reflection light cone 234, and the total reflection light cone 234 is closely attached to the high-energy photoelectric sensor 232, so that the light signal generated by the high-energy scintillator 231 is transmitted to the high-energy photoelectric sensor 232 through the total reflection light cone 234 to generate an electric signal. It should be noted that when the low-energy photoelectric sensor 222 adopts a side coupling form, the required area is small, and the low-energy scintillator 221 is directly attached to the low-energy photoelectric sensor 222.

[0085] Since the backscattering detection technology has a lower detection effect than the transmission detection technology in metal article detection, in some optional embodiments, the position state of the expansion module 200 includes a backscattering detection state and a transmission detection state. When the position state of the expansion module 200 is the backscattering detection state, as shown in Figure 1 the expansion module 200 and the detection unit 110 are located on the same side of the detected object 400, and the expansion module 200 is used to increase the area of the imaging detection device receiving the ray beam, so as to improve the efficiency of the backscattering detection device receiving the backscattering ray beam; when the position state of the expansion module 200 is the transmission detection state, as shown in Figure 2 the expansion module 200 and the detection unit 110 are located on the opposite sides of the detected object 400, the detection unit 110 is used to receive the ray beam scattered by the detected object 400 to form a backscattering detection image, and the expansion module 200 is used to receive the ray beam transmitted by the detected object 400 to form a transmission detection image.

[0086] Based on this, the imaging detection device provided in the embodiment expands the transmission detection of the expansion module 200 while the backscattering module 100 performs the backscattering detection, so as to realize the effective detection of explosives, drugs and other substances, and also accurately detect guns, knives and the like, so as to improve the detection safety; or the imaging detection device only performs the backscattering detection, and the expansion module 200 is used to increase the area of the imaging detection device receiving the ray beam, effectively improves the efficiency of the backscattering detection device receiving the backscattering ray beam, and further improves the signal-to-noise ratio and effective transmission depth of the image detected by the imaging detection device, and improves the detection effect of the backscattering detection device on the detected object. Specifically, the operator can select the position state of the expansion module 200 according to the actual needs to obtain different detection results.

[0087] When the position state of the expansion module 200 is the transmission detection state, the imaging detection device provided in the embodiment forms the backscattering detection image and the transmission detection image of the detected object 400 at the same time, so as to obtain more abundant information; when the position state of the expansion module 200 is the backscattering detection state, the backscattering detection image obtained by the expansion module 200 is fused with the backscattering detection image obtained by the backscattering module 100, so as to obtain a detection image with higher accuracy.

[0088] It should be noted that when the position state of the expansion module 200 is the transmission detection state, the position of the expansion module 200 needs to face the position of the ray source in the backscattering module 100, so as to obtain better detection effect, and the backscattering module 100 further includes a positioning ray source (not shown in the figure) for determining the position of the expansion module 200. The positioning ray source is a visible light ray source.

[0089] Further, the lateral dimension and the longitudinal dimension of the expansion detection unit 210 are not less than a detection threshold dimension, wherein the detection threshold dimension is the diameter of the spot ray beam corresponding to the maximum transmission detection distance when the position state of the expansion module 200 is the transmission detection state. For example, when the maximum transmission detection distance is 60 cm, the detection threshold dimension is 2.5 cm.

[0090] The lateral dimension of the expansion module 200 is not less than a receiving threshold dimension, wherein the receiving threshold dimension is the scanning range of the spot ray beam corresponding to the transmission detection distance of the detected object 400 when the position state of the expansion module 200 is the transmission detection state. For example, when the transmission detection distance is 50 cm, the receiving threshold dimension is 65 cm, which can adapt to most of the detected objects 400.

[0091] For example, the position state conversion of the expansion module 200 is realized through the connection module 300. Specifically, as shown in FIG. 4, the connection module 300 is connected to the expansion module 200 and the backscattering module 100, and the position state of the expansion module 200 is switched through the connection module 300. Figures 1-2As shown, the connection module 300 comprises a state conversion structure 310 and a circuit line (not shown in the figure), wherein the circuit line is used to realize the electrical connection between the backscattering module 100 and the expansion module 200, and the circuit line is arranged inside the state conversion structure 310 for the sake of aesthetics.

[0092] The two ends of the state conversion structure 310 are connected with the backscattering module 100 and the expansion module 200 respectively, wherein the backscattering module 100 is fixed in position, and the moving end of the state conversion structure 310 is connected with the expansion module 200, and the position state of the expansion module 200 is changed by changing the position of the expansion module 200.

[0093] Exemplarily, the state conversion structure 310 comprises two rotating parts 311 as rotatable joints to realize rotation and change the position state of the expansion module 200. The parts between the backscattering module 100, the two rotating parts 311 and the expansion module 200 are connected together by a rod-shaped structure or a tubular structure.

[0094] As shown, Figure 6 The rotating part 311 can comprise a ball head connecting body 3111, a limiting body 3112, a connecting base 3113 and a locking screw 3114, wherein the limiting body 3112 is used to fix the ball head connecting body 3111 and the connecting base together, the ball head connecting body 3111 can rotate in any direction inside the limiting body 3112 to realize the rotation between the rod-shaped structure or the tubular structure connected with the ball head connecting body 3111 and the rod-shaped structure or the tubular structure connected with the connecting base 3113, and further realize the position state change of the expansion module 200. Further, the locking screw 3114 is used to be screwed to press against the fixed ball head connecting body to fix the expansion module 200 in the required position state.

[0095] Alternatively, the rotating part 311 can comprise a fixing screw 3115, a first connecting body 3116, a second connecting body 3117 and a rotating shaft 3118, wherein screw holes are arranged on the first connecting body 3116 and the second connecting body 3117 to connect the rod-shaped structure or the tubular structure, the first connecting body 3116 and the second connecting body 3117 rotate around the rotating shaft 3118 to make the rod-shaped structure or the tubular structure connected with the first connecting body 3116 and the second connecting body 3117 rotate with each other to realize the position state change of the expansion module 200. Further, screw holes are arranged on the rotating shaft 3118, and the fixing screw 3115 is used to be inserted into the screw holes on the rotating shaft 3118 and screwed to fix the first connecting body 3116 and the second connecting body 3117 to fix the expansion module 200 in the required position state.

[0096] Further, the rotating part 311 rotates to change the angle between the rod-shaped structure or the tubular structure connecting the backscattering module 100 and the extension module 200, thereby changing the distance between the backscattering module 100 and the extension module 200, when the position state of the extension module 200 is the backscattering detection state, for changing the position of the extension module 200 so that the extension module 200 receives more backscattering beams; or when the position state of the extension module 200 is the transmission detection state, for changing the distance between the extension module 200 and the ray source, i.e., changing the transmission detection distance, to adapt to different volumes or widths of the detected object 400.

[0097] In summary, the imaging detection device provided by the present application increases the extension module 200 and sets the lateral dimension and the longitudinal dimension of the extension detection unit 210 in the extension module 200 to be not less than the detection threshold dimension, so that the extension detection unit 210 can receive at least one complete beam emitted after passing through the detected object 400, i.e., obtain all information of a single flying spot beam after passing through the detected object 400, thereby ensuring that the beam energy of the flying spot beam will not be lost due to the inability of the junction between the extension detection units 210 to absorb the beam, effectively improving the efficiency of the extension module 200 in receiving the beam, and due to the expansion of the area of the extension detection unit 210, reducing the number of extension detection units 210, thereby reducing the generation of noise, improving the signal-to-noise ratio of the obtained image, effectively improving the detection effect of the imaging detection device, and having extremely high industrial application value.

[0098] The description of the flow or structure corresponding to each of the above-mentioned figures has its own emphasis, and the parts not described in detail in a certain flow or structure can be referred to the related description of other flows or structures.

[0099] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. An imaging detection apparatus, characterized by, The connection module, the backscattering module and the extension module are connected through the connection module; The backscattering module comprises a ray source and a detection unit, the detection unit is on the same side of the object as the ray source; the ray source emits a flying spot beam to irradiate the object, the backscattered beam is formed by the object scattering the incident beam after being irradiated by the ray source, the detection unit is arranged in the beam range covered by the backscattered beam to receive and process the backscattered beam to form a detection image; The extension module comprises at least one extension detection unit, the lateral dimension and the longitudinal dimension of the extension detection unit are not less than a detection threshold size; the position state of the extension module comprises a backscattering detection state and a transmission detection state, when the position state is the backscattering detection state, the extension module is on the same side of the object as the detection unit, when the position state is the transmission detection state, the extension module is on the opposite side of the object as the detection unit; The connection module comprises a state conversion structure for converting the position state of the extension module and a circuit line for connecting the backscattering module and the extension module; The detection threshold size is the minimum size of the flying spot beam received when the position state of the extension detection unit is the transmission detection state.

2. The imaging detection apparatus of claim 1, wherein, The extension module is rectangular; the extension module comprises a plurality of extension detection units arranged in sequence and closely in the lateral direction; the longitudinal dimension of the extension module is the longitudinal dimension of the extension detection unit; the lateral dimension of the extension module is the sum of the lateral dimensions of all the extension detection units. The lateral dimension of the extension module is not less than a receiving threshold size; the receiving threshold size is the minimum size of the flying spot beam scanning range covered by the extension module.

3. The imaging detection apparatus of claim 1, wherein, The extension module is rectangular; the extension module comprises one extension detection unit; the lateral dimension of the extension module is the lateral dimension of the extension detection unit. The lateral dimension of the extension module is not less than a receiving threshold size; the receiving threshold size is the minimum size of the flying spot beam scanning range covered by the extension module.

4. The imaging detection apparatus of claim 1, wherein, The extension detection unit comprises at least one of a high-energy detection component and a low-energy detection component.

5. The imaging detection apparatus of claim 4, wherein, The extension detection unit comprises a high-energy detection component and a low-energy detection component; the low-energy detection component is located between the high-energy detection component and the object.

6. The imaging detection apparatus of claim 5, wherein, The extension detection unit further comprises a filter located between the high-energy detection component and the low-energy detection component.

7. The imaging detection apparatus of claim 4, wherein, The high-energy detection component comprises a high-energy scintillator; the low-energy detection component comprises a low-energy scintillator; the material of the high-energy scintillator is the same as the material of the low-energy scintillator; or the material of the high-energy scintillator is different from the material of the low-energy scintillator.

8. The imaging detection apparatus of claim 7, wherein, The high-energy detection assembly further comprises a total reflection light cone and a high-energy photoelectric sensor arranged in sequence on the side of the high-energy scintillator away from the detected object, wherein the high-energy scintillator is tightly attached to the total reflection light cone, and the total reflection light cone is tightly attached to the high-energy photoelectric sensor, so as to transmit the optical signal generated by the high-energy scintillator to the high-energy photoelectric sensor through the total reflection light cone to generate an electrical signal. The low-energy detection assembly further comprises a low-energy photoelectric sensor arranged on the low-energy scintillator perpendicular to the direction of the flying point ray beam, wherein the low-energy scintillator is tightly attached to the low-energy photoelectric sensor, so as to transmit the optical signal generated by the low-energy scintillator to the low-energy photoelectric sensor to generate an electrical signal.

9. The imaging detection apparatus of claim 1, wherein, The state conversion structure comprises a ball joint structure or a rotating shaft connecting structure, and the moving end of the state conversion structure is fixedly connected to the expansion module, so that the position state of the expansion module is converted by the movement of the moving end of the state conversion structure.

10. The imaging detection apparatus of claim 1, wherein, The backscattering module further comprises a positioning ray source, and the positioning ray source emits rays to determine the position of the expansion module.

Images