CN112034523A - Hazardous chemical substance detection method and detection system - Google Patents
Hazardous chemical substance detection method and detection system Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 93
- 239000000126 substance Substances 0.000 title claims abstract description 78
- 239000000383 hazardous chemical Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000013598 vector Substances 0.000 claims description 20
- 238000007781 pre-processing Methods 0.000 claims description 14
- 238000004806 packaging method and process Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
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- 238000003384 imaging method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 5
- 239000002360 explosive Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000006399 behavior Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000003721 gunpowder Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
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- -1 fireworks Substances 0.000 description 1
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
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Abstract
The invention relates to a method and a system for detecting hazardous chemicals. A hazardous chemical substance detection method comprises the following steps: s1, acquiring a back scattering image of the object to be detected based on the X-ray; and S2, comparing the back scattering image of the target sample with the back scattering image of the target sample, and judging whether the back scattering image is the target object. The dangerous chemical substance detection method provided by the invention can fully meet the requirement of movable retrieval, can be used for carrying out the handheld movable detection method under the environment of dangerous chemical substance vehicles with indefinite time and indefinite points, fully considers the requirements of convenience and rapidity of inspectors in the inspection work, can realize the non-unpacking inspection of articles, and is convenient and flexible.
Description
Technical Field
The invention relates to the field of article detection, in particular to a dangerous chemical detection method and a dangerous chemical detection system.
Background
With the rapid development of social economy, illegal transportation behaviors of hazardous chemical substances are continuously increased and mainly divided into two aspects, on one hand, legal equipment is used for transporting illegal hazardous chemical substances, on the other hand, illegal equipment is used for transporting illegal hazardous chemical substances, the former relates to the inspection of transportation quality, and the latter emphasizes on the object inspection of a common van.
Application number CN105445303B discloses a hand-held type backscatter imaging instrument and an imaging method thereof, including the specific design of hand-held type backscatter imaging instrument equipment and the imaging method based on 'flying line' scanning mode, the imaging method improves the defects of the traditional hand-held type equipment backscatter imaging, shortens the imaging time, improves the imaging precision, but the contrast file only researches the hand-held type backscatter imaging process, does not relate to the identification prompt of dangerous chemicals, needs the manual work to identify and process the image in the later stage, and does not have the automatic identification function. The above problems have not yet been solved.
Therefore, the existing hazardous chemical substance detection technology has defects and needs to be improved.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a dangerous chemical detection method and a dangerous chemical detection system, which can conveniently and quickly judge that a detected article is a dangerous chemical without unpacking detection.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hazardous chemical substance detection method comprises the following steps:
s1, acquiring a back scattering image of the object to be detected based on the X-ray;
and S2, comparing the back scattering image of the target sample with the back scattering image of the target sample, and judging whether the back scattering image is the target object.
Preferably, in the method for detecting hazardous chemical substances, the step S1 specifically includes:
s11, obtaining a back scattering image of the object to be detected by using X-ray equipment;
s12, judging whether suspicious data exist, if yes, executing a step S2; if not, no operation is performed.
Preferably, in the method for detecting hazardous chemical substances, in step S1, the back-scattered image based on the X-ray is obtained by compton scattering, and energy attenuation of the scattered wave in different substances follows an energy attenuation formula:
wherein, I0Is the initial intensity of the X-ray; mu is the material absorption coefficient; rho is mass density of the substance; t penetrating the thickness of the material; sigmasIs a matter scattering cross section; theta is the scattering angle.
Preferably, in the method for detecting hazardous chemical substances, the step S2 specifically includes:
s21, obtaining the gray value of each pixel point of the back scattering image to obtain a scattering vector;
s22, comparing the scattering vector of the object to be detected with the scattering vector of the sample through a cosine similarity principle to obtain a comparison value;
s23, judging whether the comparison value is larger than the similarity threshold value, if so, judging as the target object; if not, the target is judged to be not the target object.
Preferably, in the method for detecting hazardous chemical substances, the calculation formula of the cosine similarity principle is as follows:
wherein cos theta is a comparison value; a is a scattering vector of the object to be detected; b is the scattering vector of the sample.
Preferably, in the method for detecting hazardous chemical substances, the similarity threshold is 0.85-0.95.
Preferably, the hazardous chemical detection method includes, but is not limited to: bagging, boxing and barreling; the hazardous chemical substance detection method further comprises the following steps:
s0, different types of target samples are placed in the storage environment simulating the object to be detected, and the back scattering images of the target samples are obtained and stored in a classified mode.
A dangerous chemical detection system using the dangerous chemical detection method comprises a handheld detection device and an image comparison center;
the handheld detection device comprises an X-ray emitter, a detector and a preprocessing module;
the X-ray emitter is used for generating X-rays;
the detector is used for receiving scattered X-rays after the X-rays are scattered by the object to be detected, generating scattered signals and sending the scattered signals to the preprocessing module;
the preprocessing module generates a backscattering image according to the scattering signal and is connected with the image contrast center;
and the image comparison center is used for comparing the back scattering image of the object to be detected transmitted by the handheld detection device with the back scattering image of the sample to determine whether the object to be detected is a target object.
Preferably, the hazardous chemical substance detection system, handheld detection device still include the display screen for the back scattering image of waiting to examine the thing is shown in real time.
Preferably, the system for detecting hazardous chemicals further comprises a sample introduction module, configured to detect a back-scattering image of the sample, and transmit the back-scattering image to the image contrast center.
Compared with the prior art, the hazardous chemical substance detection method and the hazardous chemical substance detection system provided by the invention have the following beneficial effects:
1) the dangerous chemical substance detection method provided by the invention can fully meet the requirement of movable retrieval, the handheld movable detection method is carried out in the environment of dangerous chemical substance vehicles with variable time and variable points, the requirements of convenience and rapidity of inspectors in inspection work are fully considered, the non-unpacking inspection of articles can be realized, and the detection method is convenient and flexible;
2) the invention utilizes the back scattering image contrast function to automatically identify hazardous chemical substances and feed back the hazardous chemical substances to the inspection personnel in time, thereby effectively reducing the error of manual identification and simultaneously improving the inspection efficiency;
3) the invention considers the influence of various packages on the detection result, effectively reduces the influence of the packages on the similarity contrast result through package classification detection, and improves the detection precision.
Drawings
FIG. 1 is a flow chart of a hazardous chemical detection method provided by the present invention;
FIG. 2 is a flow chart of a method for introducing a target sample according to the present invention;
fig. 3 is a flowchart illustrating a specific step of step S2 in the hazardous chemical substance detection method according to the present invention;
FIG. 4 is a similarity comparison flow chart provided by the present invention;
FIG. 5 is a back-scattered image of a bagged powder sample according to the present invention;
FIG. 6 is a backscatter image danger1-danger5 of five explosives in accordance with the invention;
FIG. 7 is a backscatter image safe1-safe5 of five common items provided by the present invention;
fig. 8 is a block diagram of a hazardous chemical substance detection system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a hazardous chemical detection method, including the steps of:
s1, acquiring a back scattering image of the object to be detected based on the X-ray;
specifically, in this embodiment, the device for detecting the backscatter image of the sample is preferably a handheld detection device, and as a preferable scheme, in this embodiment, the packaging types of the hazardous chemical include, but are not limited to: bagging, boxing and barreling; the types of hazardous chemicals comprise gunpowder, fireworks, gasoline and the like; at this time, considering that whether the sample is a hazardous chemical can be determined according to the comparison of the hazardous chemical samples, the hazardous chemical detection method further includes:
s0, different types of target samples are placed in the storage environment simulating the object to be detected, and the back scattering images of the target samples are obtained and stored in a classified mode. In this embodiment, the target sample is preferably a hazardous chemical sample; referring to fig. 2, in the process of processing the model library, the following steps are generally performed: a1, selecting an introduction module on the handheld detection device (starting the introduction module), and directly entering a sample introduction process (not nearly including hazardous chemical samples, but also other sample types needing comparison); a2, selecting the packaging type of the sample according to the operation instruction, and in order to reduce the influence of the packaging on the detection process, firstly, guiding to select the packaging type of the sample to be introduced, wherein the packaging type is divided into three types of box packaging, bag packaging and barrel packaging; a3, after selecting a corresponding packaging type, irradiating the sample by using X rays emitted by a handheld detection device to obtain a back scattering image of the sample; a4, selecting the back scattering image with the bright area (suspicious data) as the back scattering image of the sample, and further obtaining the back scattering image storage sample library of the dangerous chemical sample. So far, the contrast data of different types of hazardous chemical samples are stored in a sample library for use.
In a specific application, in step S1, when the vehicle with further goods passes through the check point, the vehicle stops according to the instruction, and then the on-site inspector carries the handheld inspection device to get on the vehicle to perform detailed inspection on the carried goods. Hand-held type detection device, including X ray transmitter, detector and display screen, at the testing process, can satisfy the transmission and the receipt and the human-computer interaction function of X ray, the user can see the back scattering image of waiting to examine the thing through the display screen in real time, can also look over whether normally transmit or receive, data integrality etc. detection condition of X ray simultaneously in real time.
Preferably, in this embodiment, in step S1, the back scattering image based on the X-ray is obtained by compton scattering, and energy attenuation of the scattered wave in different substances follows an energy attenuation formula:
wherein, I0Is the initial intensity of the X-ray; mu is the material absorption coefficient; rho is mass density of the substance; t penetrating the thickness of the material; sigmasIs a matter scattering cross section; theta is the scattering angle. Further, I is the corresponding detected X-ray, i.e. the corresponding backscattered ray. General inflammable and explosive dangerThe atomic sequence of the chemical is relatively low and the mass density is low, so that under the condition of strong back scattering signal, the chemical is embodied as a brighter area, namely bright spot data (suspicious data).
Further, as a preferable scheme, in this embodiment, the step S1 specifically includes:
s11, obtaining a back scattering image of the object to be detected by using X-ray equipment;
s12, judging whether suspicious data exist, if yes, executing a step S2; if not, no operation is performed. And after a back scattering image of the object to be detected is obtained through detection, automatically preprocessing the back scattering image, and performing primary screening. The suspicious data is bright spot data in this embodiment, and specifically, whether there is a bright spot existing in the backscatter image may be determined, where the determination is preferably automatically determined by the handheld device, or may be manually determined by a user, and of course, the preprocessing process here may also be automatically preprocessing the image comparison center (which can effectively reduce resource usage rate of the image comparison center and improve work efficiency). In this embodiment, the on-site inspector judges whether there is a suspicious article on the vehicle, and if so, enters a dangerous chemical detection working stage (step S2), otherwise, directly releases the vehicle; namely, whether the vehicle needs to be detained or not can be quickly judged through a preprocessing step.
And S2, comparing the back scattering image of the target sample with the back scattering image of the target sample, and judging whether the back scattering image is the target object.
Specifically, after the handheld detection device transmits the backscatter image of the object to be detected to the image comparison center, the image comparison center performs similarity contrast analysis operation on the backscatter image of the object sample and the backscatter image of the target sample, and simultaneously displays a contrast analysis result on a display screen of the handheld detection device, so that the handheld detection device is fast and convenient; of course, the image contrast center may also have a display screen alone for displaying the corresponding contrast analysis result. Preferably, the image contrast center may be a separate electronic device having a function of performing the backscatter image contrast analysis, or may be an existing electronic device having basic hardware, such as a computer or a server, capable of executing predetermined computer software to perform the contrast analysis. Of course, as a preferable scheme, the image contrast center is preferably a mobile portable device, for example, the image contrast center can be contained in a backpack for portable movement, or the electronic device itself has certain auxiliary components capable of portable movement. In this embodiment, the following are specifically mentioned: the detection system provided by the invention consists of a handheld detection device and an image comparison center based on a computer platform, wherein the handheld detection device and the image comparison center are communicated through a data port. The handheld detection equipment mainly collects an X-ray backscatter image and transmits the X-ray backscatter image to an image comparison center in time; and the image comparison center based on the computer platform analyzes the similarity between the suspicious article and the related dangerous chemical articles through image comparison, and simultaneously feeds back the detection result to the handheld terminal in time.
Referring to fig. 3, as a preferred scheme, in this embodiment, the step S2 specifically includes:
s21, obtaining the gray value of each pixel point of the back scattering image to obtain a scattering vector; here, it should be noted that, for the extraction processing of the gray values of the respective pixel points of the backscatter image, not only the backscatter image of the object to be detected is operated, but also the backscatter image of the target sample (hazardous chemical sample) is operated, so that it can be ensured that the obtained data are all obtained in the same working environment; of course, the extraction operation of the gray value can also be performed on the back scattering image of the target sample in advance, and the back scattering image is automatically called when in use, so that the operation time is reduced, and the detection efficiency is improved.
S22, comparing the scattering vector of the object to be detected with the scattering vector of the sample through a cosine similarity principle to obtain a comparison value; as a preferred solution, in this embodiment, the calculation formula of the cosine similarity principle is as follows:
wherein cos theta is a comparison value; a is a scattering vector of the object to be detected; b is the scattering vector of the sample.
S23, judging whether the comparison value is larger than the similarity threshold value, if so, judging as the target object; if not, the target is judged to be not the target object.
Referring to fig. 4, in the present embodiment, the similarity contrast process of the backscatter image is as follows:
c1 inputting backscatter images of the specimen and suspicious item as image1 and image2, respectively;
c2, preprocessing the image1 and the image2, namely unifying the size and the format of the image;
c3, sequentially reading the gray value of each pixel point in each picture to respectively form two groups of multi-dimensional vectors which are sequentially named as a and b;
c4, calculating the modular length of each vector a and b, and converting the modular length into a unit vector;
c5, calculating the dot product of the vectors a and b, namely calculating the cosine similarity between the two vectors, which can represent the similarity of the two backscatter images image1 and image 2;
c6, judging whether the suspicious goods belong to dangerous chemicals according to the obtained similarity and a set similarity threshold, if the similarity is larger than the set threshold, the suspicious goods are considered to belong to dangerous chemicals, otherwise, the goods are considered to be safe and belong to common goods.
In the specific implementation, the handheld detection device receives the detection result from the image contrast center, the detection result is displayed on a screen in the word of 'dangerous chemical substances' or 'common goods', the field inspector carries out further inspection work according to the detection result, for the vehicle which is deemed to have dangerous chemical substances, the vehicle should be guided to be parked in another area for further investigation, and for the vehicle which is deemed to be safe, delay caused by traffic inspection should be reduced even if the vehicle is released.
Specifically, the similarity threshold in step S23 should satisfy a lower value within a reasonable range, so as to effectively reduce the missing detection behavior of the hidden dangerous chemicals. In the invention, the backscatter images of the bagged gunpowder are taken as sample data and are respectively compared with the backscatter images of a plurality of dangerous chemicals and the backscatter images of a plurality of common substances to preliminarily determine that the similarity threshold value is 0.88, and when the similarity of the backscatter images of the suspicious substances exceeds 0.88, the suspicious substances can be regarded as dangerous chemicals. Preferably, in this embodiment, the similarity threshold is 0.85-0.95, and more preferably 0.85, 0.88, 0.92, or 0.95, which is adjusted according to the specific target. Of course, said similar thresholds set are also set separately for different package types, e.g. 0.882 for bags, 0.93 for boxes, 0.85 for buckets. The corresponding calling of the similar threshold value can be realized by setting the packaging type to be detected on the handheld detection device.
Further, the setting of the similarity threshold value may also be obtained experimentally (the bagged powder is taken as an example and is explained below):
referring to fig. 5-7, in order to obtain the preliminary similarity threshold, the present invention uses the backscatter image sample of the bagged powder as sample data (specifically, refer to fig. 5) to compare the sample data with backscatter images of five explosives and backscatter images of five common objects, the backscatter images of the five explosives are sequentially named as danger1, danger2, danger3, danger4, and danger5 (specifically, refer to fig. 6), the backscatter images of the five common objects are sequentially named as safe1, safe2, safe3, safe4, and safe5 (specifically, refer to fig. 7), and the similarity results (comparison values in the above) are obtained according to the steps of the dangerous chemical detection method c1-c6, as shown in table 1 and table 2.
TABLE 1 comparison of sample similarity to dangerous chemicals
TABLE 2 comparison of sample similarity to common articles
According to the invention, the influence of the package on the similarity detection result is considered, the similarity comparison is also carried out on the back scattering images of the dangerous chemicals in the same package, and the comparison result is shown in Table 3.
Table 3 similarity contrast under consideration of packaging
According to tables 1-2, it is concluded that the similarity between the bagged powder sample and the explosive is above 0.882, and the similarity between the bagged powder sample and the common article is below 0.882.
According to the table 3, the sub-package detection fully considers the influence of the package on the detection result, and the similarity detection precision of similar articles is improved to some extent and exceeds 0.93.
For dangerous chemical detection, the principle of reducing the condition of missing detection of dangerous chemicals is followed, namely, the condition that the dangerous chemicals are regarded as common articles is reduced, the similarity threshold value is properly set to be lower within a reasonable range, and the identification capability of detection work on the behavior of stealing the dangerous chemicals can be effectively improved.
From the limited experimental data herein, the backscattering similarity of all the identified hazardous chemicals is above 0.88, and the threshold of the similarity can be determined to be 0.88.
Example 2: and taking the back scattering image of the bagged gunpowder as sample data, setting two parts of suspicious articles, wherein one part is a dangerous chemical substance, the other part is a common cargo, the suspicious articles are wrapped in the opaque bag, and the suspicious articles with the properties of the dangerous chemical substance are detected.
Firstly, a back scattering image of a sample is obtained through a sample introduction module by utilizing a handheld terminal device, and the back scattering image is uploaded to an image comparison center on a computer and named sample;
then, carrying out back scattering imaging on the suspicious object by using the handheld terminal equipment again through the real-time detection module, uploading an imaging picture of a key part to an image comparison center, and sequentially naming the imaging picture as unknown1 and unknown 2;
and carrying out image similarity comparison on the image comparison center to obtain a detection result.
As shown in table 4, the backscatter images of each suspect article were compared with the sample data in sequence to derive the similarity.
TABLE 4 comparison of the similarity of suspicious articles to the samples
The invention determines the similar threshold value as 0.88, and based on the similar threshold value, the detection system automatically judges that the unknown1 is dangerous chemical and the unknown2 is common goods. Meanwhile, the image comparison center feeds the result back to the handheld terminal, and the result is displayed on a display screen of the handheld terminal, so that the use is rapid and convenient.
Further, referring to fig. 8, the present invention further provides a hazardous chemical substance detection system using the hazardous chemical substance detection method, including a handheld detection device and an image contrast center; the hazardous chemical substance detection system integrates collection, processing and display, and comprises two parts, namely software and hardware, wherein the software comprises a sample introduction module, a real-time detection module and a system setting module, and the hardware comprises a back scattering device, an image analyzer and a central processing unit;
the handheld detection device comprises an X-ray emitter, a detector and a preprocessing module;
the X-ray emitter is used for generating X-rays;
the detector is used for receiving scattered X-rays after the X-rays are scattered by the object to be detected, generating scattered signals and sending the scattered signals to the preprocessing module;
the preprocessing module is used for generating a backscattering image according to the scattering signal, judging whether suspicious characteristics exist in the backscattering image and connecting the backscattering image with the image comparison center;
and the image comparison center is used for comparing the back scattering image of the object to be detected transmitted by the handheld detection device with the back scattering image of the sample to determine whether the object to be detected is a target object. It should be noted that the image contrast center (such as the computer or the server in the above) has the basic hardware (such as the processor, the display screen, etc.) of the electronic device required in the above, and the details are not repeated here.
Preferably, in this embodiment, the handheld detection device further includes a display screen for displaying the back scattering image of the object to be detected in real time. For implementation, the operations for human-computer interaction in the above are described.
Preferably, in this embodiment, the handheld detection apparatus further includes a sample introduction module, configured to detect a backscatter image of the sample, and transmit the backscatter image to the image contrast center. For implementation, the step of introducing the target sample is completed according to the setting requirement, which is not described herein again.
Specifically, the hazardous chemical substance detection method and system provided by the invention are based on an X-ray handheld mobile detection method, and relate to an X-ray inspection technology, wherein X-rays are electromagnetic waves with strong penetrability, and the interaction of the X-rays and substances is specifically represented by three functions of transmission, scattering and absorption. In the invention, the backscattering technology of X-rays is mainly utilized, which is derived from the scattering phenomenon of the X-rays and substances, under the irradiation of the same dose of the X-rays, the scattering action degrees of different substances and the X-rays are different, and the backscattering technology has obvious effect on dangerous chemicals with lower atomic numbers. Therefore, the X-ray can penetrate through the package of the article in the safety inspection process, the scattering characteristic of the X-ray in the article is utilized to carry out X-ray backscatter imaging on the article, and the backscatter image of the suspicious article and the backscatter image of the sample are subjected to similarity contrast through the computer platform, so that the property of the internal article is detected, and the purpose of non-unpacking inspection is realized.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A hazardous chemical substance detection method is characterized by comprising the following steps:
s1, acquiring a back scattering image of the object to be detected based on the X-ray;
and S2, comparing the back scattering image of the target sample with the back scattering image of the target sample, and judging whether the back scattering image is the target object.
2. The method for detecting hazardous chemical substances according to claim 1, wherein the step S1 specifically comprises:
s11, obtaining a back scattering image of the object to be detected by using X-ray equipment;
s12, judging whether suspicious data exist, if yes, executing a step S2; if not, no operation is performed.
3. The hazardous chemical detection method of claim 1, wherein in step S1, the back scattering image based on X-ray is obtained by compton scattering, and energy attenuation of scattered waves in different substances follows the energy attenuation formula:
wherein, I0Is the initial intensity of the X-ray; mu is the material absorption coefficient; rho is mass density of the substance; t penetrating the thickness of the material; sigmasIs a matter scattering cross section; theta is the scattering angle.
4. The method for detecting hazardous chemical substances according to claim 1, wherein the step S2 specifically comprises:
s21, obtaining the gray value of each pixel point of the back scattering image to obtain a scattering vector;
s22, comparing the scattering vector of the object to be detected with the scattering vector of the sample through a cosine similarity principle to obtain a comparison value;
s23, judging whether the comparison value is larger than the similarity threshold value, if so, judging as the target object; if not, the target is judged to be not the target object.
5. The method for detecting hazardous chemical substances according to claim 4, wherein the calculation formula of the cosine similarity principle is as follows:
wherein cos theta is a comparison value; a is a scattering vector of the object to be detected; b is the scattering vector of the sample.
6. The method for detecting hazardous chemical substances according to claim 4, wherein the similarity threshold is 0.85-0.95.
7. The hazardous chemical detection method of claim 1, wherein the type of packaging of the hazardous chemical includes, but is not limited to: bagging, boxing and barreling; the hazardous chemical substance detection method further comprises the following steps:
s0, different types of target samples are placed in the storage environment simulating the object to be detected, and the back scattering images of the target samples are obtained and stored in a classified mode.
8. A hazardous chemical detection system using the hazardous chemical detection method of any one of claims 1 to 7, comprising a hand-held detection device and an image contrast center;
the handheld detection device comprises an X-ray emitter, a detector and a preprocessing module;
the X-ray emitter is used for generating X-rays;
the detector is used for receiving scattered X-rays after the X-rays are scattered by the object to be detected, generating scattered signals and sending the scattered signals to the preprocessing module;
the preprocessing module generates a backscattering image according to the scattering signal and is connected with the image contrast center;
and the image comparison center is used for comparing the back scattering image of the object to be detected transmitted by the handheld detection device with the back scattering image of the sample to determine whether the object to be detected is a target object.
9. The hazardous chemical detection system of claim 8, wherein the handheld detection device further comprises a display screen for displaying a backscatter image of the object to be inspected in real time.
10. The hazardous chemical detection system of claim 8, wherein the handheld detection device further comprises a sample introduction module for detecting a backscatter image of the sample and delivering to the image contrast center.
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| CN112034523B (en) | 2022-07-19 |
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