CN212780578U - X-ray emission system and detection system - Google Patents
X-ray emission system and detection system Download PDFInfo
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- CN212780578U CN212780578U CN202021688598.5U CN202021688598U CN212780578U CN 212780578 U CN212780578 U CN 212780578U CN 202021688598 U CN202021688598 U CN 202021688598U CN 212780578 U CN212780578 U CN 212780578U
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Abstract
The utility model relates to an X ray transmitting system and detecting system belongs to X ray detection technology field. The detection system comprises: the detector comprises a cabin body and a first detector array, wherein an X-ray source for emitting a main ray and a side beam ray, a collimator for limiting the radiation range of the main ray and a side beam ray intensity detection device for collecting the radiation intensity of the side beam ray are arranged in the cabin body; the main ray and the side beam ray form an included angle; the radiation intensity of the side beam ray measured by the side beam ray intensity detection device is used as a compensation quantity to correct the radiation intensity of the main ray passing through the object to be detected. The utility model can not weaken the radiation intensity of the main ray when detecting the side beam ray; the leakage of the side beam radiation to the environment is reduced; besides, the radiation intensity distribution of the side beam rays and the main rays at different angles is the same, and the influence of the side beam rays and the main rays on the fluctuation of the working condition of the accelerator is the same, so that the correction of the main ray intensity by using the radiation intensity of the side beam rays is more accurate.
Description
Technical Field
The utility model relates to an X ray transmitting system and detecting system belongs to X ray detection technology field.
Background
In order to prevent the occurrence of a safety accident, a security inspection apparatus is installed in a crowded place or a transportation gateway. The digital radiation imaging system is widely applied to security inspection equipment as a nondestructive detection technology, and comprises a fixed container detection system, a movable container detection system and the like.
Digital radiation imaging systems are inspection systems based on some kind of radioscopic imaging technique, for example: the X-ray and X-ray detection principle is that when X-rays pass through a substance, the intensity of the X-rays is attenuated due to absorption and scattering of the X-rays by the substance, the attenuation degree is related to the property and thickness of the substance, and the greater the density and thickness, the greater the attenuation. In the container where there is no object, the intensity of the transmitted X-ray is high, so that the exposure of the corresponding position of the radiographic film is increased, and a darker image appears after darkroom processing, thereby achieving the purpose of inspection.
The X-ray is emitted by the ray source, however, the working state of the ray source is unstable, the change of the working state of the ray source can be caused by vibration, temperature change of a high-voltage circuit and size change of a microwave element caused by temperature change, the change of the working state of the ray source directly causes the intensity of the X-ray emitted by the ray source to change, and the change is difficult to predict. According to the imaging principle of X-ray, when the intensity of X-ray changes, it is inconvenient to normalize the image, and the problem of uneven brightness of the image may occur.
In order to solve the problem of uneven brightness of an image, the prior art has two solutions:
1. the principle of the penetration ionization chamber method is shown in fig. 1 and 2, an X-ray source 2 comprises an X-ray emission source 7 and an X-ray emission source shielding device 8, main rays 5 emitted by the X-ray emission source 7 are received by a detector array 6 through a penetration ionization chamber 3 and a collimator 4 to realize imaging, the intensity of rays at the exit of the X-ray source 2 detected by the penetration ionization chamber 3 is counted, the integral intensity change of the rays in each sampling is obtained, and the intensity is used as a compensation value to perform brightness correction on the imaging. However, in this method, because the penetrating ionization chamber 3 is disposed at the outlet of the X-ray source 2, the intensity of the X-ray is weakened (by about 10%), and the intensity detected by the penetrating ionization chamber 3 is a uniform value, and the light intensities of the X-ray at different angles cannot be reflected, generally, if the central intensity of the X-ray is 1, the edge intensity of the X-ray is 0.1-0.15, so the method not only weakens the intensity of the X-ray, but also causes a correction error phenomenon at the upper and lower edges of the image, and the intensity is weak and the correction effect is poor.
2. The reference detector method, whose principle is shown in fig. 3, uses a reference detector 9 (generally, an end detector of a detector array 6) to acquire the intensity of a chief ray 5 that does not pass through an object to be detected, and the method does not weaken the ray intensity, but because the reference detector 9 is disposed at the edge of the detector array 6, the reflected radiation intensity and the radiation intensity change correspond to the edge portion of the chief ray 5, and the edge portion of the chief ray 5 is not the main portion of the imaging (the central portion of the chief ray 5 is the main portion of the imaging), it is necessary to estimate the intensity of the central portion of the chief ray 5 according to the relationship between the central portion and the edge portion of the chief ray 5, and further modify the image. However, the relationship between the central portion and the edge portion of the principal ray 5 is difficult to accurately obtain, and only by means of experience and statistical models, which results in poor final correction.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an X-ray detection system, which is used for solving the problem of poor correction effect; an X-ray emitting system is also provided.
In order to achieve the above object, the present application provides a technical solution of an X-ray detection system, which includes:
the X-ray source, the collimator and the side beam ray intensity detection device are arranged in the cabin body;
the X-ray source is used for emitting a main ray and a side beam ray; the main ray and the side beam ray form an included angle; the included angle is 5-15 degrees;
the collimator is arranged on the optical path of the main ray and used for limiting the range of the main ray radiation;
the side beam ray intensity detection device is arranged on a light path of the side beam ray and is used for collecting the radiation intensity of the side beam ray;
the cabin body is provided with an outlet which is arranged on a light path at the downstream of the collimator and is used for emitting the main ray;
the first detector array is used for acquiring the radiation intensity of the main ray;
the radiation intensity of the side beam ray is used as a compensation quantity to correct the radiation intensity of the main ray passing through the object to be detected.
The utility model discloses a technical scheme's of X ray detection system beneficial effect is: the X-ray source of the detection system emits a beam of side beam rays which form a certain included angle with the main rays besides the main rays, the intensity of the side beam rays is detected by a side beam ray intensity detection device arranged in the cabin, and the radiation intensity of the side beam rays is used as compensation quantity to correct the radiation intensity of the main rays passing through the object to be detected. The analysis results in that: 1. the side beam rays and the main rays form a certain included angle, and the radiation intensity of the main rays cannot be weakened by detecting the side beam rays; 2. the radiation intensity of the side beam is detected in the cabin body, so that the leakage of the side beam to the environment is reduced; 3. the side beam ray and the main ray are emitted by the X-ray source in a unified mode, the influence of fluctuation on the side beam ray is the same as that on the main ray, and therefore the radiation intensity of the main ray is corrected more accurately by using the radiation intensity of the side beam ray. The utility model discloses an increase the quantity of X ray source transmission ray and realized detecting the inhomogeneous accurate correction of image luminance, overall structure is simple, with low costs.
Furthermore, in order to reduce the cost, the side beam ray intensity detection device is a single detector and is used for collecting the radiation intensity of the center of the side beam ray.
Furthermore, because the radiation intensity distributions of the side beam rays at different diffusion angles have correspondences with the radiation intensity distributions of the main ray at different diffusion angles, in order to realize the detection of the radiation intensities of the side beam rays at different radiation angles and improve the accuracy of correction, the side beam ray intensity detection device is a second detector array and is used for collecting the radiation intensities of the side beam rays at different angles.
In addition, the present application also provides a technical solution of an X-ray emission system, which includes:
the X-ray source, the collimator and the side beam ray intensity detection device are arranged in the cabin body;
the X-ray source is used for emitting a main ray and a side beam ray; the main ray and the side beam ray form an included angle; the included angle is 5-15 degrees;
the collimator is arranged on the optical path of the main ray and used for limiting the range of the main ray radiation;
the side beam ray intensity detection device is arranged on a light path of the side beam ray and is used for collecting the radiation intensity of the side beam ray;
the cabin body is provided with an outlet which is arranged on a light path at the downstream of the collimator and is used for emitting the main ray;
the radiation intensity of the side beam radiation is used as a compensation variable for correcting the radiation intensity of the main radiation passing through the object to be examined.
The utility model discloses a technical scheme's of X ray emission system beneficial effect is: the X-ray source of the emission system emits a beam of side beam rays which form a certain included angle with the main rays besides the main rays, the intensity of the side beam rays is detected by a side beam ray intensity detection device arranged in the cabin, and the radiation intensity of the side beam rays is used as compensation quantity to correct the radiation intensity of the main rays passing through the object to be detected. The analysis results in that: 1. the side beam rays and the main rays form a certain included angle, and the radiation intensity of the main rays cannot be weakened by detecting the side beam rays; 2. the radiation intensity of the side beam is detected in the cabin, so that the influence of environmental factors on the radiation intensity of the side beam is reduced; 3. the side beam ray and the main ray are emitted by the X-ray source in a unified mode, the influence of fluctuation on the side beam ray is the same as that on the main ray, and therefore the radiation intensity correction by the side beam ray is more accurate. The utility model discloses an increase the quantity of X ray source transmission ray and realized detecting the inhomogeneous accurate correction of image luminance, overall structure is simple, with low costs.
Furthermore, in order to reduce the cost, the side beam ray intensity detection device is a single detector and is used for collecting the radiation intensity of the center of the side beam ray.
Furthermore, because the radiation intensity distributions of the side beam rays at different diffusion angles have correspondences with the radiation intensity distributions of the main ray at different diffusion angles, in order to realize the detection of the radiation intensities of the side beam rays at different radiation angles and improve the accuracy of correction, the side beam ray intensity detection device is a second detector array and is used for collecting the radiation intensities of the side beam rays at different angles.
Drawings
FIG. 1 is a schematic diagram of a prior art transmission ionization chamber X-ray detection system;
FIG. 2 is a schematic diagram of the X-ray detection principle of the transmission ionization chamber method in the prior art;
FIG. 3 is a schematic diagram of a prior art reference detector method X-ray detection system;
FIG. 4 is a schematic view of the X-ray emission system of the present invention;
in the figure: the X-ray radiation imaging device comprises a cabin body 1, an X-ray source 2, a penetrating ionization chamber 3, a collimator 4, a main ray 5, a detector array 6, an X-ray emission source 7, an X-ray emission source shielding device 8, a reference detector 9, a single detector 10 and a side beam ray 11.
Detailed Description
Embodiment mode 1
X-ray detection system embodiment:
the X-ray detection system includes a detector array 6 (i.e. a first detector array), a background controller, and an X-ray emission system as shown in fig. 4, where the X-ray emission system includes a cabin 1, and an X-ray source, a collimator 4, and a single detector 10 are disposed in the cabin 1.
The X-ray source comprises an X-ray emission source 7 and an X-ray emission source shielding device 8, wherein the X-ray emission source 7 emits a main ray 5 and a side beam ray 11 which has a certain included angle with the main ray, the included angle is larger than 0, and in practical engineering application, the included angle is generally 5-15 degrees; an X-ray emission source shielding device 8 (the X-ray emission source shielding device 8 is made of a lead material) for shielding X-rays other than the main rays 5 and the side-beam rays 11, so that the X-ray emission source shielding device 8 is provided with only a main-ray exit and a side-beam ray exit; regarding the magnitude of the radiation intensity of the side beam ray 11 and the main ray 5, the magnitude relationship between the radiation intensity of the side beam ray 11 and the main ray 5 is related to the X-ray emission source 7, the main ray 5 is a ray for detection, and the side beam ray 11 is a ray for correcting the radiation intensity of the main ray 5, and therefore the magnitude of the radiation intensity of the side beam ray 11 and the main ray 5 may be the magnitude of the radiation intensity of the main ray 5 or the magnitude of the radiation intensity of the side beam ray 11. And the included angle of the side beam ray 11 and the main ray 5 can also be adjusted as required, the utility model discloses do not do the restriction.
The collimator 4 is arranged in the optical path of the chief rays 5 for defining the range of radiation of the chief rays 5 so that the range of radiation of the chief rays 5 matches the range of detection by the detector array 6.
The single detector 10 is used as a side beam ray intensity detection device, is arranged on the light path of the side beam ray 11, and is used for collecting the radiation intensity of the side beam ray 11; since the side beam ray 11 is a beam of rays with a certain angle spread out, the radiation intensity of the side beam ray 11 collected by the single detector 10 is the radiation intensity of the central ray of the side beam ray 11.
The cabin 1 is provided with an outlet which is arranged on the light path at the downstream of the collimator 4 and is used for emitting the main ray 10 passing through the collimator 4; regarding the material of the cabin body, because the X ray source sends a beam of side beam ray 11, has proposed higher requirement to the shielding, consequently in order to avoid the radiation injury, do not consider under the condition of cost, cabin body 1 can be made by shielding material lead, nevertheless the utility model discloses do not do the restriction to the concrete material of the cabin body 1, also can be for the ordinary cabin body of current.
The detector array 6 is used for detecting the radiation intensity of the main ray 11, and when the detected object exists, the detector array 6 is used for detecting the radiation intensity of the main ray 11 after passing through the detected object.
The background controller is connected to the detector array 6 and the single detector 10, and is configured to correct the radiation intensity of the main ray passing through the object to be detected by using the radiation intensity of the side beam as a compensation amount, and finally output a detection image with uniform and unchanged brightness.
The detection process of the X-ray detection system comprises the following steps: the X-ray emission source 7 emits main rays 5 and side beam rays 11, the X-ray emission source shielding device 8 shields rays except the main rays 5 and the side beam rays 11 and outputs the main rays 5 and the side beam rays 11, the radiation intensity of the side beam rays 11 is detected by a single detector 10 and is sent to the background controller, the main rays 5 detect an object to be detected through the isolator 4 and an outlet of the cabin body 1, the detector array 6 detects the radiation intensity of the main rays 5 passing through the object to be detected and sends the radiation intensity to the background controller, the background controller corrects the radiation intensity of the main rays 5 passing through the object to be detected through the radiation intensity of the side beam rays 11, and finally a detection image is output.
For the single detector 10 to detect the radiation intensity of the side beam 11, the embodiment only needs to use one detector to detect the radiation intensity of the side beam 11, and since there is only one detector and the side beam 11 is diffused, the single detector 10 preferably detects the central radiation intensity of the side beam 11.
In the above embodiment, the ray source is the X-ray emission source 7, and certainly the ray source can also be other radiation imaging available ray sources such as a gamma ray source, and the utility model discloses a method not only can be used to the inspection of container vehicle, can also be used to other detecting systems that adopt radiation imaging technique, and application scope is extensive.
Right the utility model discloses a detecting system carries out the analysis, and this detecting system has following several advantages: 1. the side beam ray 11 and the main ray 5 form a certain included angle, and the radiation intensity of the main ray cannot be weakened by detecting the radiation intensity of the side beam ray 11; 2. the radiation intensity of the side beam ray 11 is detected in the cabin, so that the influence of environmental factors on the radiation intensity of the side beam ray 11 is reduced; 3. the side beam ray 11 and the main ray 5 are emitted by the X-ray source, the radiation intensity distribution of the side beam ray 11 at different angles is the same as that of the main ray 5, and the influence of the fluctuation on the side beam ray 11 is the same as that of the main ray 5, so that the radiation intensity correction by the side beam ray 11 is more accurate.
X-ray emission system embodiment:
the structural composition and working process of the X-ray emission system are already described in the above embodiment of the X-ray detection system, and are not described herein again.
Embodiment mode 2
X-ray detection system embodiment:
the X-ray detection system of this embodiment is different from the X-ray detection system of embodiment 1 in that the side beam ray intensity detection device is different, the side beam ray intensity detection device in embodiment 1 is a single detector 10, and only detects the radiation intensity at the center of the side beam ray, but in this embodiment, the side beam ray intensity detection device is a second detector array, and the radiation intensities at different diffusion angles of the side beam ray 11 are comprehensively detected in the form of a detector array, and compared with the case that the radiation intensity at one angle is detected by the single detector 10 and the radiation intensities at other angles are calculated, in this embodiment, the radiation intensities at different diffusion angles of the side beam ray 11 can be respectively obtained by the detectors at different diffusion angles, and then the imaging ray in the corresponding diffusion angle range of the main ray 5 is corrected; for example, if a certain detector X in the second detector array has a spread angle of 5 ° (zero degrees with respect to the ray center), and the spread angles of the detectors Y1 and Y2 … in the detector array 6 are also 5 °, the detector X is used to correct the intensity of the main ray 5 detected by the detectors Y1 and Y2 …, and each detector in the second detector array detects the radiation intensity of the side beam ray 11 at the corresponding spread angle, so that the actual detection is more accurate and the correction is more accurate.
Generally, because the second detector array is in the cabin 1, the detected side beam ray 11 is close to the X-ray source, and the side beam ray 11 is not diffused greatly, i.e. the diffusion surface is small, the number of detectors in the second detector array is small, and the cost is relatively low; moreover, because the second detector array is arranged in the cabin body 1, the influence of environmental factors on the radiation intensity of the side beam rays 11 can be avoided, and the detection result is more accurate.
Other components, connection relationships, and working processes of the X-ray detection system of the present embodiment are the same as those of the X-ray detection system of embodiment 1, and are not described herein again.
X-ray emission system embodiment:
the structural composition and working process of the X-ray emission system are already described in the above embodiment of the X-ray detection system, and are not described herein again.
Claims (6)
1. An X-ray detection system, comprising:
the X-ray source, the collimator and the side beam ray intensity detection device are arranged in the cabin body;
the X-ray source is used for emitting a main ray and a side beam ray; the main ray and the side beam ray form an included angle; the included angle is 5-15 degrees;
the collimator is arranged on the optical path of the main ray and used for limiting the range of the main ray radiation;
the side beam ray intensity detection device is arranged on a light path of the side beam ray and is used for collecting the radiation intensity of the side beam ray;
the cabin body is provided with an outlet which is arranged on a light path at the downstream of the collimator and is used for emitting the main ray;
the first detector array is used for acquiring the radiation intensity of the main ray;
the radiation intensity of the side beam ray is used as a compensation quantity to correct the radiation intensity of the main ray passing through the object to be detected.
2. The X-ray detection system of claim 1, wherein the side beam intensity detection device is a single detector for collecting the radiation intensity at the center of the side beam.
3. The X-ray detection system of claim 1, wherein the side beam intensity detection device is a second detector array for collecting radiation intensities of different angles of the side beam.
4. An X-ray emission system, comprising:
the X-ray source, the collimator and the side beam ray intensity detection device are arranged in the cabin body;
the X-ray source is used for emitting a main ray and a side beam ray; the main ray and the side beam ray form an included angle; the included angle is 5-15 degrees;
the collimator is arranged on the optical path of the main ray and used for limiting the range of the main ray radiation;
the side beam ray intensity detection device is arranged on a light path of the side beam ray and is used for collecting the radiation intensity of the side beam ray;
the cabin body is provided with an outlet which is arranged on a light path at the downstream of the collimator and is used for emitting the main ray;
the radiation intensity of the side beam radiation is used as a compensation variable for correcting the radiation intensity of the main radiation passing through the object to be examined.
5. The X-ray emission system of claim 4, wherein the side beam intensity detection device is a single detector for collecting the radiation intensity at the center of the side beam.
6. The X-ray emission system of claim 4, wherein the side beam intensity detection device is a second detector array for collecting radiation intensities of different angles of the side beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021688598.5U CN212780578U (en) | 2020-08-13 | 2020-08-13 | X-ray emission system and detection system |
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| CN202021688598.5U CN212780578U (en) | 2020-08-13 | 2020-08-13 | X-ray emission system and detection system |
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| CN212780578U true CN212780578U (en) | 2021-03-23 |
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