CN118707613A - Inspection equipment, inspection methods and inspection systems - Google Patents

Abstract

The invention provides an inspection device, an inspection method thereof and an inspection system. The examination apparatus comprises a transmission imaging device configured to construct a transmission image of an object under examination; and a diffraction detection device configured to detect a characteristic of at least a portion of the inspected object. The transmission imaging device defines an examination path. The diffraction detection device is capable of moving to a specific position to detect radiation diffracted by at least a portion of the inspected object.

Description

Inspection equipment, inspection methods and inspection systems

Technical Field

The present invention relates to the field of security inspection technology, and in particular to an inspection device, an inspection method and an inspection system.

Background Art

Current security inspection equipment is capable of quickly inspecting items without opening packages or boxes.

Existing security inspection equipment generally adopts the method of X-ray transmission imaging, and the more advanced ones include CT inspection equipment; however, this type of equipment still has the problem that it can only observe the general shape but cannot fully determine whether the suspect is prohibited.

More sophisticated equipment is needed that can more definitively determine whether the inspected object contains prohibited items.

Summary of the invention

One aspect of the present invention provides an inspection device, comprising:

a transmission imaging device configured to construct a transmission image of the object under inspection; and

a diffraction detection device configured to irradiate radiation towards an object to be inspected and to detect a property of at least a portion of the object to be inspected by detecting radiation diffracted from at least a portion of the object to be inspected,

Wherein, the transmission imaging device defines an inspection channel, and the inspected object is moved in the inspection channel and scanned by the transmission imaging device;

The diffraction detection device can be moved to a specific position in the transverse direction of the extension direction of the inspection channel to detect at least a portion of the diffracted radiation of the inspected object.

In one embodiment, the diffraction detection device comprises a diffracted radiation detector configured to receive diffracted radiation in order to determine a property of a substance causing the diffraction;

The inspection device comprises a rail configured to span the inspection channel in a transverse direction of the extension direction of the inspection channel,

Therein, the diffracted radiation detector is movable along the track so as to receive and detect diffracted radiation at a specific location.

In one embodiment, the diffraction detection device and the transmission imaging device comprise a common radiation source configured to irradiate radiation towards the object under inspection.

In one embodiment, the diffraction detection device and the transmission imaging device comprise respective radiation sources which irradiate radiation towards the object under inspection.

In one embodiment, it is determined based on the transmission image that the inspected object contains a suspect and the position of the suspect on the inspected object, and based on the position of the suspect, the diffraction radiation detector is moved to the specific position to receive radiation diffracted by the suspect to determine the characteristics of the suspect portion.

In one embodiment, the specific position is substantially located on an extension line of a connecting line between the radiation source and the suspect portion.

In one embodiment, the track is an arc track, so that the distance between the diffraction radiation detector and the radiation source remains substantially unchanged during the movement of the diffraction radiation detector along the arc track.

In one embodiment, the track is an arc track, so that when the diffraction radiation detector moves along the arc track, the diffraction radiation is incident along the normal direction of the radiation receiving surface of the diffraction radiation detector.

In one embodiment, the transmission imaging device comprises a transmission radiation detector configured to receive radiation transmitted through the object under inspection so as to be able to construct a transmission image of the object under inspection;

The transmission radiation detector comprises a plurality of detection units arranged in two rows, wherein the detection units in each row are spaced apart from each other, and the detection units in the two rows form a continuous receiving surface relative to a projection direction of radiation.

In one embodiment, adjacent detection units located in two rows have an overlap with respect to the projection direction of the radiation.

In one embodiment, the transmission radiation detectors are arranged along an arc, so that the distance between each portion of the transmission radiation detector and the radiation source remains substantially constant.

In one embodiment, the inspection device further comprises an encoding motor, and the encoding motor is used to drive the diffraction radiation detector to move along the track to the specific position.

One aspect of the present invention provides an inspection method using the above-mentioned inspection device, comprising:

irradiating the object under inspection using the radiation source;

constructing a transmission image of the object under inspection by detecting the transmission radiation transmitted through the object under inspection by the transmission radiation detector;

identifying a portion of the suspect image in the transmission image that corresponds to the suspect; and

Determining the position of the suspect portion in the inspected object based on the position of the suspect portion in the transmission image; and

The diffraction detection device is moved to a specific position to detect the diffracted radiation from the suspect object in order to determine the characteristics of the suspect portion.

In one embodiment, moving the diffraction detection device to a specific position to detect diffracted radiation from the suspect to determine the characteristics of the suspect portion includes:

The diffraction radiation detector is moved on the track so that the diffraction radiation detector is substantially located on an extension line of a connecting line between the radiation source and the suspect portion.

One aspect of the present invention provides an inspection system, comprising:

CT inspection unit, including a CT machine, used to inspect whether the inspected object contains any suspicious items; and

The re-inspection unit includes the above-mentioned inspection equipment and is used to detect the composition of the suspected article.

In one embodiment, after inspection by the CT inspection unit, inspected objects that do not contain suspicious objects are released, and inspected objects that contain suspicious objects are transferred to the re-inspection unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present invention, wherein:

FIG. 1 is a front schematic diagram showing an inspection device according to an embodiment of the present invention.

FIG. 2 shows a schematic side view of an inspection device according to an embodiment of the present invention.

DETAILED DESCRIPTION

In order to more clearly explain the purpose, technical solutions and advantages of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present invention, and should not be understood as limiting the present invention. In the specification and the drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The wording "one" or "an" does not exclude multiple. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top" or "bottom" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. When an element such as a layer, a film, a region or a substrate substrate is referred to as being "on" or "under" another element, the element may be "directly" located "on" or "under" another element, or there may be an intermediate element.

The present invention discloses an inspection device, including a transmission imaging device and a diffraction detection device. The transmission imaging device is configured to irradiate radiation toward an inspected object and construct a transmission image of the inspected object by inspecting the transmitted radiation. The diffraction detection device is configured to irradiate radiation toward the inspected object and detect the characteristics of at least a portion of the inspected object by inspecting the radiation diffracted from the inspected object. In this embodiment, the transmission imaging device defines an inspection channel, and the inspected object can be scanned by the transmission imaging device through the inspection channel. The diffraction detection device can move laterally along the extension direction of the inspection channel, for example, move to a specific position to detect diffraction radiation. In the present invention, the diffraction detection device can be moved to a specific position to complete the measurement of the diffraction radiation, so there is no need to arrange a row of diffraction detection detectors (laterally) across the inspection channel, which greatly reduces the cost of the equipment.

In this embodiment, the transmission imaging device scans the inspected object located on the inspection channel, constructs a transmission image of the inspected object, and finds the part of the suspected object in the transmission image by observing the transmission image (here, it can be manual observation, or it can be automatically detected by using software and computer). Since some suspected objects may have irregular shapes, or the image is unclear due to the composition of the suspected object, it is not possible to judge what kind of object the suspected object part is simply from the transmission image, and further detection is required. At this time, according to the transmission image scanned by the transmission imaging device, the position of the suspected object corresponding to the suspected object part on the inspected object is located, and the diffraction detection device is moved to a specific position. The diffraction detection device receives the radiation diffracted by the suspected object, thereby detecting the characteristics of the suspected object, such as the atomic coefficient of the suspected object, the composition of the suspected object, and the composition, etc., thereby realizing that it is possible to confirm whether the inspected object contains prohibited items without opening the package. In this embodiment, the transmission imaging device and the diffraction detection device can be supported by the bracket 1, the transmission imaging device can be fixed on the bracket 1, and the diffraction detection device can move on the bracket 1. For example, the inspection channel extends along a first direction, and the diffraction detection device can move along a second direction, and the second direction is transverse to the first direction.

In the embodiment of the present invention, the transmission imaging device and the diffraction detection device may each have a radiation source, and the radiation source of the diffraction detection device and the radiation source of the transmission imaging device may be of the same model, or different models may be configured as needed. The radiation source of the transmission imaging device and the transmission radiation detector cooperate to complete the transmission scanning, and the radiation source of the diffraction detection device and the diffraction radiation detector cooperate to complete the diffraction detection.

In another embodiment of the present invention, the transmission imaging device and the diffraction detection device may have a common radiation source.

FIG1 shows an inspection device according to an embodiment of the present invention, comprising: a radiation source 2, a transmission radiation detector 10, and a diffraction radiation detector 9. The radiation source 2 may be a commonly used X-ray machine or other special X-ray source. In this embodiment, the radiation source 2 may be a radiation source 2 shared by the transmission radiation detector 10 and the diffraction radiation detector 9. The radiation source 2 and the transmission radiation detector 10 constitute a transmission imaging device, and the radiation source 2 and the diffraction radiation detector 9 constitute a diffraction detection device. The radiation source 2 may be fixed on a bracket 1. The transmission radiation detector 10 is configured to receive radiation emitted by the radiation source 2 so as to be able to construct a transmission image of the inspected object, and the radiation source 2 and the transmission radiation detector 10 define an inspection channel 4 for the inspected object to pass through. The inspection channel 4 may be configured with tools such as a conveyor belt, a conveyor track, a trolley, or a fixed container for placing or accommodating the inspected object. The inspected object on the inspection channel 4 may be a bag, luggage, customs clearance product, meat product, etc. The radiation emitted by the radiation source 2 can irradiate the inspected object on the inspection channel 4, and the radiation leaves after interacting with the inspected object, and the radiation leaving the inspected object is received and detected by the transmission radiation detector 10. The radiation source 2, the transmission radiation detector 10 and the inspection channel 4 defined by them can be configured so that the inspected object is stationary or moving relative to the transmission radiation detector 10. In an embodiment where the inspected object is moving relative to the transmission radiation detector 10, the radiation can scan the inspected object, and the transmission radiation detector 10 can continuously receive the transmission radiation, so that a transmission image of the scanned part or all of the inspected object can be constructed.

In one embodiment, the radiation source 2 and the transmission radiation detector 10 construct a transmission image of the inspected object by scanning the inspected object, and the inspection device or the operator can determine whether the inspected object contains a suspected object from the acquired transmission image. For example, at a border checkpoint, the inspected object (such as a customs clearance person) may contain contraband such as drugs. When the inspected object passes through the inspection channel 4, the transmission image can show the location of the suspected object in the inspected object (such as a person).

In the present embodiment, the diffracted radiation detector 9 is configured to receive diffracted radiation in order to determine a property of the substance causing the diffraction.

The diffraction radiation detector 9 can receive radiation diffracted from a substance at a specific diffraction angle, so that the properties of the substance can be measured by detecting the received radiation. The "specific position" referred to in this article means that the diffraction radiation detector 9 can detect the diffracted radiation at a specific position, and at other positions, the properties of the desired partially diffracted radiation cannot be detected (or the detected diffracted radiation signal from the target suspect portion is so weak that the properties of the suspect portion cannot be measured). The "properties" in this article include the atomic coefficients or composition of the substance, etc. The technology for detecting the properties of a substance based on radiation diffracted by the substance is known, and will not be described in detail here. The diffraction radiation detector 9 of the present invention can work using the existing diffraction detection principle.

In one embodiment, the inspection device may further include a track 5, which crosses the inspection channel 4 in the lateral direction of the extension direction of the inspection channel 4. The track 5 may be a slide rail, a rack with teeth, or a lead screw, and the diffraction radiation detector 9 may slide on the track 5, move on the track 5 through the meshing of teeth, or move on the lead screw through threads. The diffraction radiation detector 9 can move along the track 5 in various forms so as to receive and detect diffracted radiation at a specific position.

According to an embodiment of the present invention, the part of the suspected object contained in the inspected object is determined based on the transmission image and the position of the suspected object on the inspected object is located. According to the determined position of the suspected object on the inspected object, the diffraction radiation detector 9 is moved to the specific position to receive the radiation diffracted by the suspected object part, so that the characteristics of the suspected object part can be determined. Since the diffraction radiation detector 9 can move and receive the diffracted radiation at a suitable specific position to complete the measurement, it is possible to achieve that one diffraction radiation detector 9 completes the measurement without arranging a row of diffraction radiation detectors 9 across the inspection channel 4 to detect the diffracted radiation, which greatly reduces the cost and complexity of the equipment.

In one embodiment of the present invention, the specific position may be substantially located on the extension line of the connection line between the radiation source 2 and the suspected object portion. In this embodiment, the radiation emitted by the radiation source 2 irradiates the inspected object, and after being diffracted by the suspected object portion of the inspected object, it generally continues to propagate along the direction in which the radiation source 2 irradiates the suspected object portion, and the radiation receiving surface of the diffraction radiation detector 9 receives the diffracted radiation. Here, the diffracted radiation is incident along the normal direction of the radiation receiving surface, meeting the detection requirements of the diffraction inspection device (involving conditions such as the diffraction angle well known to those skilled in the art, which are not discussed here). In other words, the diffraction inspection device is directed toward the diffracted radiation, which means that the diffracted radiation is incident along the normal direction of the radiation receiving surface, so as to obtain the best detection effect; otherwise, the detection effect will be deteriorated.

In one embodiment of the present invention, the track 5 is an arc track 5, and the arc track 5 (e.g., curvature) is configured such that the distance between the diffraction radiation detector 9 and the radiation source 2 remains substantially unchanged during the movement of the diffraction radiation detector 9 along the arc track 5. The track 5 of this embodiment can make the intensity of the diffracted radiation substantially equivalent during the detection of suspects at different positions, which is beneficial to improving the accuracy of judging the characteristics of the suspects during the detection process.

The arc track 5 (e.g., curvature) is configured such that, during the movement of the diffraction radiation detector 9 along the arc track 5, the radiation receiving surface of the diffraction radiation detector 9 allows the diffracted radiation to be incident along the normal direction of the radiation receiving surface of the diffraction radiation detector 9. Such an arc track 5 enables the diffraction radiation detector 9 to automatically adjust the radiation receiving surface toward the incident diffracted radiation during the movement, without configuring an additional device to adjust the orientation of the diffraction radiation detector 9, thereby simplifying the structure of the diffraction radiation detector 9.

In an embodiment of the present invention, the transmission radiation detector 10 includes a plurality of detection units 11, which can be arranged in two rows, and the detection units 11 in each row are spaced apart from each other, and the detection units 11 in the two rows form a continuous receiving surface in the transverse direction of the radiation projection direction. Through such a configuration, the plurality of detection units 11 can construct a two-dimensional transmission image of a section of the inspected object by detecting the transmission radiation. For example, if a suspect part is found in the transmission image of the section, the composition or atomic coefficient and other characteristics of the suspect part can be further determined by using a diffraction detection device.

In the embodiment of the present invention, adjacent detection units 11 located in two rows have overlap with respect to the projection direction of radiation. Such a configuration allows the detected images to be continuous, and allows multiple detection units 11 to be flexibly arranged, and allows a single detection unit 11 to be repaired without having to replace the entire row of transmission detectors (for the case where the row of transmission detectors is an integral whole).

In an embodiment of the present invention, the transmission radiation detector 10 is arranged along an arc, and a plurality of detection units 11 are arranged along a substantially arc-shaped trace. Such a configuration allows each portion of the transmission radiation detector 10, i.e., each detection unit 11, to maintain a substantially unchanged distance from the radiation source 2, and the intensities of the detection signals of the detection units 11 are substantially equivalent, and no additional algorithm is required for correction in the process of constructing the transmission image.

In an embodiment of the present invention, the inspection device further includes an encoding motor 7, which is used to drive the diffraction radiation detector 9 to move along the track 5 to each of the multiple specific positions. The inspection device can control the encoding motor 7 to move the diffraction radiation detector 9 on the track 5 to a specific position based on the position of the suspected object part contained in the inspected object determined by the transmission image on the inspected object, for example, the radiation source 2, the position of the suspected object and the specific position are in a straight line. For example, the inspection device can determine the connecting line of the radiation source 2 and the suspected object based on the position of the two, and further calculate the spatial coordinates of the position of the intersection of the connecting line and the track 5, so as to send the spatial coordinates to the encoding motor 7, and the encoding motor 7 can move the diffraction radiation detector 9 to the specific position on the track 5 corresponding to the spatial coordinates. The specific calculation method is not described in detail here, and those skilled in the art can use other methods to drive the diffraction radiation detector 9 to the specific position on the track 5 based on the requirement that the radiation source 2, the position of the suspected object and the specific position are in a straight line.

In an embodiment of the present invention, the inspection device may include a bracket 1, for example, as shown in FIG1 , the radiation source 2 may be arranged on the top of the bracket 1, for example, fixedly mounted on the top of the bracket 1, or may be moved on the top of the bracket 1 by a slide rail. In the embodiment shown in FIG1 , the inspection channel 4 is shown as an inspection channel 4 having an enclosing structure, however, the inspection channel 4 may be a space defined by a radiation source and a transmission radiation detector, or may be a flat plate, a conveyor belt or other device, and the inspected object may be moved in the inspection channel, for example, transported through the inspection channel by a conveyor belt within the inspection channel, or, for example, accommodated through the inspection channel by a container. The extension direction (first direction) of the inspection channel is, for example, a direction from the inside of the paper of FIG1 to the outside of the paper. Crossing the inspection channel refers to crossing the inspection channel along the transverse direction (second direction) of the paper, for example, the arrangement of the inspection channel across the curved track as shown in FIG1 .

In another embodiment, the radiation source 2 may be arranged at the bottom of the support 1 , while the transmission radiation detector 10 and the diffraction radiation detector 9 are arranged at the top of the support 1 , opposite to the radiation source 2 to receive radiation.

In an embodiment of the present invention, the diffraction radiation detector 9 is arranged on the detector bracket 6, and the detector bracket 6 can slide freely on the track 5, or be driven by the encoding motor 7 to reach any specific position on the track 5. Here, it can be understood that the encoding motor 7 is arranged on the detector bracket 6, and the detector bracket 6 has teeth or other matching parts to cooperate with the track, so that the encoder motor 7 can drive the detector bracket 6 to move controllably on the track 5. In an embodiment of the present invention, due to the arc setting of the track, the diffraction radiation detector 9 can be fixed on the detector bracket 6. In the process of detecting diffraction radiation, the diffraction radiation detector 9 is fixed relative to the detector bracket 6. It is only necessary to use the encoding motor 7 to move the detector bracket 6 to a specific position to detect the diffraction radiation, because the setting of the arc track can allow the radiation receiving surface of the diffraction radiation detector 9 to face the incident diffraction radiation, so that the detection can be completed. This process does not need to adjust the direction of the diffraction radiation detector 9, which greatly simplifies the diffraction measurement process. For example, the center of the arc track can be the position of the radiation source.

The detector support 6 may further include a rear collimator 8 for collimating the diffracted radiation, and the collimated radiation is received by the diffracted radiation detector 9. The support 1 may further include a front collimator 3 for collimating the radiation radiated from the radiation source 2. The front collimator 3 may have an adjustment function, which may change the opening angle of the radiation beam emitted from the front collimator 3, which will not be described in detail.

One aspect of the present invention provides an inspection method, which can be implemented using the inspection device in the above embodiment. The method includes:

Expose the object to be examined to radiation;

constructing a transmission image of the object under inspection by detecting transmitted radiation transmitted through the object under inspection;

identifying a portion of the image of the suspect object corresponding to the suspect object in the transmission image;

Determining the position of the suspect portion in the inspected object based on the position of the suspect portion in the transmission image; and

The diffraction detection device is moved to a specific position to detect the diffracted radiation from the suspect object in order to determine the characteristics of the suspect portion.

In one embodiment, moving the diffraction detection device to a specific position to detect diffracted radiation from the suspect to determine the characteristics of the suspect portion includes:

The diffraction radiation detector 9 is moved on the track 5 so that the diffraction radiation detector 9 is substantially located on an extension line of a connecting line between the radiation source 2 and the suspect part.

One aspect of the present invention provides an inspection system, comprising:

A CT inspection unit, including a CT machine, for inspecting whether the inspected object contains a suspect; and

The re-inspection unit includes the inspection device described in any of the previous embodiments, and is used to identify the components of the suspected object.

In one embodiment, the inspection channel 4 defined by the re-examination section may be continuous with the inspection channel defined by the CT inspection section; in another embodiment, the inspection channel 4 defined by the re-examination section may not be continuous with the inspection channel defined by the CT inspection section.

When the inspected object passes through the CT inspection unit, the CT inspection unit can obtain a three-dimensional image of the inspected object, so that the inspected object can be inspected to see if it contains prohibited items without opening the package. When the inspected object does not contain prohibited items, the inspected object is released; when the three-dimensional image of the inspected object shows that it may contain prohibited items, that is, a part of the image is determined to be a suspect (it cannot be confirmed to be a prohibited item), the inspected object will be sent to the re-inspection unit. In the re-inspection unit, the inspected object is scanned by the transmission detection device to determine the position of the suspect in the inspected object, and then the diffraction detection device can be moved to the above-mentioned specific position to detect the suspect and determine the characteristics of the suspect, such as explosives, guns, drugs or others. In this embodiment, since a transmission detection device is provided, the inspected object can be re-inspected, thereby improving the inspection accuracy, and at the same time, the position of the suspect in the inspected object can be determined; further, the diffraction detection device in this embodiment can be moved, so there is no need to arrange the diffraction detection unit 11 or detector across the inspection channel 4, thereby reducing the diffraction detector or sensor, reducing the cost of the entire equipment and system, and at the same time, it can achieve re-inspection without unpacking, thereby improving accuracy and efficiency.

Multiple embodiments of the present invention are described above, however, it should be understood that these embodiments are only examples rather than all embodiments of the present invention, and are only for illustrating the principles of the present invention rather than for limiting the present invention; the description of the above embodiments may have some emphasis, however different embodiments can be combined according to the above description of the present invention to derive other embodiments of the present invention.

Claims (15)

1. An inspection apparatus comprising:

A transmission imaging device configured to construct a transmission image of the object under examination; and

A diffraction detection device configured to irradiate radiation toward an object to be inspected and detect characteristics of at least a portion of the object to be inspected by inspecting the radiation diffracted from the at least a portion of the object to be inspected,

Wherein the transmission imaging device defines an inspection channel in which the inspected object is moved to be scanned by the transmission imaging device;

the diffraction detection means is capable of detecting radiation diffracted by at least a portion of the object under examination, moving to a specific position in a direction transverse to the direction of extension of the examination path.

2. The inspection apparatus of claim 1, wherein

The diffraction detection device includes a diffracted radiation detector configured to receive diffracted radiation to determine a property of a substance causing diffraction;

the inspection apparatus comprises a track arranged across the inspection channel transversely to the direction of extension of the inspection channel,

Wherein the diffracted radiation detector is movable along the track to receive and detect diffracted radiation at a specific location.

3. The inspection apparatus of claim 2, wherein

The diffraction detection device and the transmission imaging device comprise a common radiation source configured to irradiate radiation towards an object under examination; or (b)

The diffraction detection device and the transmission imaging device comprise respective radiation sources configured to irradiate a radiation beam towards the object under examination.

4. An inspection apparatus according to claim 3, wherein the object under inspection is determined to contain a suspect and the position of the suspect on the object under inspection based on the transmission image, and the diffracted radiation detector is moved to the particular position based on the position of the suspect so as to receive radiation diffracted by the suspect to determine the characteristics of the suspect portion.

5. An inspection apparatus according to claim 3, wherein the specific location is located substantially on an extension of a connection line of the radiation source and the suspected portion.

6. The inspection apparatus of claim 2, wherein the track is an arcuate track such that a distance of the diffracted radiation detector from the radiation source remains substantially constant during movement of the diffracted radiation detector along the arcuate track.

7. The inspection apparatus of claim 2, wherein the track is an arcuate track such that diffracted radiation from a diffracted radiation detector during movement along the arcuate track is incident in a direction normal to a radiation receiving face of the diffracted radiation detector.

8. An inspection apparatus according to claim 2, wherein the transmission imaging device comprises a transmission radiation detector configured to receive radiation transmitted through the inspected object so as to be able to construct a transmission image of the inspected object;

The transmitted radiation detector comprises a plurality of detection units arranged along two rows, with the detection units on each row being spaced apart from each other, and the detection units of the two rows constituting a continuous receiving surface with respect to the direction of projection of the radiation.

9. The examination apparatus of claim 8, wherein adjacent detection units located in two rows have an overlap with respect to the projection direction of the radiation.

10. An inspection apparatus according to claim 2, wherein the transmitted radiation detectors are arranged along an arc such that the distance of each portion on the transmitted radiation detectors from the radiation source remains substantially constant.

11. The inspection apparatus of claim 2, further comprising an encoding motor to drive the diffracted radiation detector to move along the track to the particular position.

12. An inspection method using the inspection apparatus according to any one of claims 1 to 11, comprising:

illuminating the inspected object using the radiation source;

Detecting transmission radiation transmitted through the inspected object by the transmission radiation detector to construct a transmission image of the inspected object;

identifying a suspected object image part corresponding to a suspected object in the transmission image;

Determining the position of the suspected object in the checked object based on the position of the suspected object image part in the transmission image; and

The diffraction detection device is moved to a specific position based on the position of the suspected object to be inspected, and diffraction radiation from the suspected object is detected to determine the characteristics of the suspected object.

13. The inspection method of claim 12, wherein moving the diffraction detection device to a particular location, detecting diffracted radiation from the suspected substance to determine the characteristic of the suspected substance comprises:

the diffracted radiation detector is moved on the track such that the diffracted radiation detector is substantially located on an extension of a connection line of the radiation source and the suspected substance.

14. An inspection system, comprising:

a CT inspection unit including a CT machine for inspecting whether or not an object to be inspected includes a suspected substance; and

A recheck unit comprising an inspection apparatus as claimed in any one of claims 1 to 11 for detecting a component of the suspected substance.

15. The inspection system according to claim 14, wherein after the inspection by the CT inspection section, an object under inspection that does not include a suspected object is passed, and the object under inspection that includes a suspected object is transferred to the re-inspection section.