CN204314235U - For container or the check system of vehicle and the alignment system for this check system - Google Patents

Abstract

The utility model discloses an alignment system and an inspection system used for a container or vehicle inspection system. The inspection system includes a ray source, a collimator, and a detector module installed on the detector arm. The ray source, collimator, and detector module are arranged to form an inspection channel. The ray beam emitted by the ray source passes through the collimator and enters the To inspect the object, the attenuated beam of rays is collected by the detector module to complete the inspection. The alignment system includes a measurement module arranged to receive a radiation beam emanating from the collimator and to determine the position and orientation of the radiation source and the collimator by measuring the radiation beam. The alignment method can more accurately measure the alignment degree of the center point of the ray source, the center line of the pen end of the detector and the center line of the collimator.

Description

Inspection system for container or vehicle and alignment system for the inspection system

technical field

The invention relates to the field of X or Gamma ray safety inspection, in particular to an X or Gamma ray inspection system and its alignment system and alignment method for containers or vehicles as inspected objects.

Background technique

"Three points and one line" is the general term for the coplanarity of the accelerator target point, the center line of the detector pen end, and the collimator center line. The purpose of adjusting "three points and one line" is to require the accelerator target point, the center line of the detector pen end, and the The centerline of the instrument (and sometimes the centerline of the calibration device, etc.) all reside in a datum plane, as shown in Figure 1.

The existing measurement method is to use a laser theodolite to manually measure the alignment of the accelerator target point, the centerline of the collimator and the centerline of the probe tip. The vertical line of the theodolite reticle coincides with the center line of the detector at the upper and lower ends of the vertical arm of the detector, and the vertical line of the theodolite reticle should be aligned with the center of the target as much as possible. This method is judged by human eyes, which is not objective and accurate enough, and has a lot to do with the placement, debugging, and measurement of human visual senses.

Also, many mobile inspection systems now use detector arm supports, and these mobile inspection systems need to quickly deploy the supports to carry out work after arriving at a new inspection location. However, the detector arm support needs to be further adjusted as a mechanical structure so that the ray source, collimator and detector are located in the same plane. Therefore, there is a need for an alignment system and method that can achieve alignment accurately and quickly and reliably.

Contents of the invention

In view of this, the purpose of the present invention is to solve the above-mentioned problems, and realize the rapid alignment of the ray beam of the inspection system and the detector module.

A first aspect of the present invention provides an alignment system for a container or vehicle inspection system, including a measurement module, the measurement module is a sensor array composed of a plurality of sensors, each sensor is configured to measure the intensity of radiation; in the measurement module A row of sensors arranged on the longitudinal centerline of the detector module of the container or vehicle inspection system, when the radiation intensity value measured by the row of sensors arranged on the longitudinal centerline of the detector module of the measurement module is the curve of the radiation intensity value At the maximum value, make sure that the ray is aligned with the detector module.

According to an aspect of the present invention, the sensor array and the detector module of the container or vehicle inspection system are arranged substantially vertically relative to each other.

A first aspect of the present invention provides an alignment system for a container or vehicle inspection system, including a measurement module, the measurement module is a sensor row composed of a plurality of sensors, and each sensor is configured to measure radiation intensity; One of the sensors in the measurement module is arranged on the longitudinal centerline of the detector module of the container or vehicle inspection system, when the ray intensity value measured by the one sensor of the measurement module arranged on the longitudinal centerline of the detector module is ray When the maximum value of the intensity value curve is reached, it is determined that the ray is aimed at the detector module.

According to an aspect of the present invention, the sensor row and the detector module of the container or vehicle inspection system are arranged substantially vertically with respect to each other.

According to an aspect of the present invention, the sensor is a small detector, the size of which is smaller than the detector crystal size of the detector module of the container or vehicle inspection system, and one small detector in the measurement module is arranged at The longitudinal centerline of the detector module of the container or vehicle inspection system.

According to an aspect of the present invention, the sensor arranged on the longitudinal centerline of the detector module of the container or vehicle inspection system is a sensor measuring the middle point of the module.

According to one aspect of the present invention, it is determined that the ray passing through the collimator has been aimed at the detector module when the ray intensity value measured by the sensor on the measurement module located at the midpoint of the detector module is the largest.

The first aspect of the present invention provides an inspection system for containers or vehicles, including a ray source, a collimator, a detector arm and a detector module installed on the detector arm, a ray source, a collimator, and a detector The detector module is arranged to form an inspection channel, the rays emitted by the ray source pass through the collimator and are incident on the inspected object to be collected by the detector module to complete the inspection, which also includes the above-mentioned alignment system.

Description of drawings

Fig. 1 shows the plane where the detector is expected to be located where the radiation source, the collimator and the detector module are distributed on the detector arm;

Fig. 2 is another view of the detector in which the ray source, collimator and detector modules are distributed on the detector arm;

Figure 3a is a measurement module according to an embodiment of the present invention, which is arranged laterally on a detector module;

Fig. 3b is a measurement module according to an embodiment of the present invention, which is arranged laterally on the detector module;

Fig. 4 is the specific size of the measuring module according to one embodiment of the present invention;

Fig. 5 is the ray intensity distribution measured by the measurement module when the collimator is aligned with the centerline position of the detector module;

Figures 6 and 7 show the distribution of ray intensity measured by the measurement module when the collimator deviates from the centerline position of the detector module.

Detailed ways

Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like elements throughout. The following embodiments will be described by referring to the figures in order to explain the present invention.

In one embodiment of the present invention, a container or vehicle inspection system applied to X or Gamma rays includes a radiation source 1 , a collimator 2 and a detector module 3 installed on a detector arm. The ray source 1 can be an X-ray accelerator or a gamma ray accelerator. In order to obtain better collimated rays, a collimator 2 may be provided at the exit port of the accelerator. Those skilled in the art should know that other devices can also be used in order to obtain the desired radiation, such as a device that directly emits collimated radiation. The detector module 3 is arranged on the detector arm 4 . The detector arm 4 includes a detector cross arm 41 and a detector vertical arm 42. When the detector arm 4 is unfolded, the detector 3 on the detector cross arm 41 and the detector vertical arm 42 receives the collimated The ray beam transmitted through the object to be inspected, so as to achieve the purpose of inspection. That is to say, when in use, the ray source 1, the collimator 2 and the detector module 3 constitute an inspection channel, as shown in Figure 2.

The container or vehicle inspection system applied to X or Gamma rays includes an alignment system, which is used to align a ray source 1 , a collimator 2 and a detector module 3 .

The alignment system includes a measurement module 5 . The measuring module 5 is arranged on the detector module 3 . In one embodiment, the measurement module 5 is arranged on the arm 4 or the frame 4 of the detector module 3 . The measurement module 5 is arranged to receive the radiation emitted by the radiation source 1 . As shown in FIG. 3 , the measuring module 5 extends laterally, and the detector module 3 extends longitudinally.

In an embodiment of the present invention, in order to determine the position of the detector module 3, the measurement module 5 is arranged at the position of the detector module 3 of the inspection system, so that the orientation of the collimator 2 is measured by the measurement module 5, that is, the fall of the ray. point position, and adjust the collimator 2 to the detector module 3 based on the measurement results. In this embodiment, the measuring module 5 is arranged on the detector arm 4 provided with the detector module 3, and it is ensured that the transverse centerline of the detector module 3 or the transverse centerline of the detector arm 4 is in line with a certain position of the measuring module 5. A known location corresponds, for example, to the midpoint of the measuring module 5 . The midline of the detector module 3 mentioned here and the midline of the detector arm 4 or frame 4 of the detector module 3 have the same meaning, that is, the detectors are arranged along the vertical direction, and the detector arm 4 is divided into two parts along the vertical midline. equal halves.

In the embodiment of the present invention, the measurement module 5 is placed on the detector arm 4, as shown in FIG. 2 . The measurement module 5 is composed of a plurality of detector crystals 6 which may be smaller in size than, or relative to, the detector crystals 6 of the imaging detector module 3 of the inspection system It can be a small detector. Preferably, the width of each small detector crystal 6 in the measurement module 5 may be 1/n of the measurement module 5, as shown in Fig. 3a. N is an integer and can be selected as required. That is to say, the measurement module 5 can be composed of several small detector crystals 6 arranged side by side to form a long or slender block-shaped body 6 . The total width of the measurement module 5 is greater than the width of the system detector module 3 , as shown in FIG. 4 . The length direction of the measurement module 5 extends along the transverse direction of the detector module 3 .

The measuring module 5 is mechanically positioned on the detector module 3, and the elongated measuring module 5 can be arranged such that its midpoint is located on the center line of the detector arm 4, and the length extension direction of the elongated measuring module 5 is in line with the detection The length extending direction of device arm 4 is vertical. Thus, the specific position of the beam center can be precisely and quantitatively measured.

The data measured by each measurement module 5 can be transmitted to a computer for analysis.

In one embodiment of the present invention, the total width of the measurement module 5 is 4 to 5 times the width of the system detector module 3 . For example, the width of the detector module 3 is 10mm, and the width of each small detector crystal 6 in the measurement module 5 is 1.5mm, and the whole measurement module 5 is made up of 32 small detector crystals 6, and the width is 32*1.5=48mm, such as Figure 4 shows.

When the radiation source 1 emits radiation, after being collimated by the collimator 2, the radiation beam irradiates the measurement module 5, and the collimated radiation is incident on a plurality of detector crystals 6 of the measurement module 5, wherein the detector crystal 6 of which the radiation is incident The received ray intensity is the largest, and the energy of the ray received by the detector crystal 6 near the normal incident detector crystal 6 decreases gradually, that is, the ray intensity measured by the detector crystal 6 is detected as they leave the normal incident place. The distance between the device crystal 6 increases and decreases. FIG. 5 shows the curves formed by the intensity values of the ray beams respectively measured by the 32 detector crystals 6 when the center of the measurement module 5 is located on the centerline of the detector arm 4 .

As can be seen from Fig. 5, since the collimated rays are aimed at the center line of the detector arm 4, the intensity of the rays detected by the detector crystal 6 in the middle of the measurement module 5 is the strongest, that is, the highest point of the curve in the figure (Fig. The middle Y-axis is the normalized value of the measured ray intensity). The radiation intensity measured by the detector crystal 6 away from the midpoint of the measurement module 5 decreases as the distance away from the midpoint increases. According to the embodiment of the present invention, using the curve shown in FIG. 5 to judge alignment has favorable advantages. For example, the operator can intuitively judge the position of the peak value of the ray according to the position of the curve, and intuitively grasp the direction to be adjusted.

When the collimator 2 is not aligned with the midpoint of the measurement module 5, i.e. the centerline of the detector arm 4, the highest point of the curve in Fig. 5 will deviate from the center of the measurement module 5 (because the position of the detector crystal 6 has been adjusted fixed, the position of the central detector crystal 6 is known, and its measured ray intensity value falls on the Y axis).

6 and 7 respectively show the intensity curves measured when the collimator 2 deviates from the centerline of the detector arm 4 . The present invention can display the deviation of the collimator 2 or X-ray by using the peak value of the intensity curve to deviate from the Y axis (also can be considered as the misalignment of the detector module, those skilled in the art should understand that misalignment is relative, that is, as the emission side X-ray and collimator combination and as the detector module on the receiving side), and by adjusting the direction of the collimator 2 so that the intensity peak is adjusted to the Y axis to adjust the direction of the collimator 2 to the direction of the detector arm 4 midline. Due to the use of such a parabola-like curve, the operator can intuitively judge the deviation, and the degree of deviation can be roughly estimated by the deviation of the peak of the curve from the Y axis, making the alignment operation easy.

Therefore, the technical solution of the present invention avoids the uncertainty and randomness of manual adjustment and the impact of such randomness on subsequent inspections, and the method of the present invention is simple and clear, and the adjustment process is intuitive and fast, which is convenient for the operator to quickly complete the inspection preparatory work. When the operator observes that the peak of the curve is on the right side of the Y axis, the detector module can be adjusted to the right side. If the bracket on which the detector module is located is fixed, the X-ray and collimator can be adjusted so that the ray beam or the ray beam is to the left. In actual operation, the operator judges intuitively by observing the curve instead of groping for the direction of adjustment, which makes the preparation for inspection easy and fast.

In order to adjust the orientation of the collimator 2 , adjustment means may be provided to adjust the orientation of the collimator 2 . For example, a motor and a pivoting device may be provided, and the motor drives the pivoting device to pivot the collimator 2 to adjust the orientation of the collimator 2 . Thus, automatic adjustment is realized.

According to an embodiment of the present invention, the method for aligning an accelerator and a detector applied to an X or Gamma ray container or vehicle inspection system includes: 1) using the accelerator to emit rays; 2) using the measurement module 5 to measure the intensity distribution of the rays; 3) judging The relative positions of the ray source 1 , the collimator 2 and the arm 4 are adjusted; 4) Steps 2 and 3 are repeated until the ray beam passing through the collimator 2 is aligned with the detector module 3 .

Specifically, for example, when the curve in FIG. 6 is displayed, the operator can adjust the collimator 2 to the right, and the intensity peak of the curve in FIG. 6 is moved to the Y axis. When the curve of FIG. 7 is displayed, the operator can adjust the collimator 2 to the left, and the intensity peak of the curve in FIG. 7 is moved to the Y axis.

When the accelerator target point, the centerline of the detector pen end, and the centerline of the collimator 2 are fully aligned, the signal strength of the X or Gamma rays received by each detector crystal 6 in each measurement module 5 should be as shown in Figure 5, That is, the center of the ray beam can hit the middle of each measurement module 5 , that is, the centerline of the pen end of each detector module 3 .

According to the ray intensity distribution measured by each detector module 3 on the arm 4 or frame 4, the relative positional relationship between the ray source 1, the collimator 2 and the arm 4 or frame 4 can be judged, and the position offset and angle can be calculated The deflection amount is corrected for the system, and finally the intensity distribution measured by all the detector modules 3 is a parabolic curve as shown in FIG. 5 .

In another embodiment according to the invention, a certain detector crystal 6 of the measurement module 5 is positioned on the center line of the detector module 3 . Since it is known that the detector crystal 6 is located on the center line, it is only necessary to adjust the orientation of the collimator 2 so that the maximum value of the detected ray intensity occurs at the known position of the detector crystal 6 and the collimator can be known. 2 Align the center line of the detector module 3. That is, in this embodiment, the center of the measurement module 5 is not on the center line of the detector module 3 .

In another embodiment according to the present invention, the measuring module 5 is a whole. The measurement module 5 is a strip-shaped measurement module 5, which may be a sensor array, and the position of each sensor in the sensor array is determined and known. Thus, the intensity of the beam received by each sensor is known. That is, the intensity of the received ray beam at each location is known. Thus, by observing the position of the peak of the beam intensity, the orientation of the collimator 2 can be determined. Similar to the above-mentioned embodiments, the orientation of the collimator 2 can be adjusted so that the ray beam emitted by the collimator 2 faces a desired position, for example, toward the centerline of the detector module 3 .

In another embodiment according to the present invention, as shown in Figure 3b, the alignment system for container or vehicle inspection system includes a measurement module 5, the measurement module 5 is a sensor array composed of a plurality of sensors, each sensor configuration To measure the radiation intensity. An array of sensors in the measurement module is arranged on the longitudinal centerline of the detector module of the container or vehicle inspection system. When the row (when the small sensor volume of the measurement module is much smaller than the detector module, it can be multiple rows of small sensors) of the measurement module arranged on the longitudinal centerline of the detector module, the ray intensity value measured by the sensor is When the maximum value of the ray intensity value curve is reached, it is determined that the ray is aimed at the detector module.

Those skilled in the art should know that the detector crystal 6 can have a certain volume, and the measurement module 5 is generally arranged laterally along the detector arm 4. When the angle formed between the measurement module 5 and the detector arm 4 is close to 90 degrees, When within the range, the technical scheme of the present invention is still achievable.

According to one embodiment of the present invention, an alignment method for an inspection system for aligning containers or vehicles is provided. The inspection system includes a ray source 1, a collimator 2, and a detector module 3 installed on a detector arm 4. The ray source 1, the collimator 2, and the detector module 3 are arranged to form an inspection channel, and the rays emitted by the ray source 1 After the collimator 2 is incident on the object to be inspected, it is collected by the detector module 3 to complete the inspection. The alignment method includes setting a measurement module 5 arranged to receive radiation emitted from the radiation source 1 and passing through the collimator 2 . The alignment method also includes determining the position of the main beam of rays through the peak value of the ray intensity measured by the measurement module 5 . When the measurement module 5 measures and shows that the intensity of the ray beam detected at the longitudinal centerline of the detector module 3 is the largest (i.e. the ray main beam), it is determined that the ray emitted by the ray source 1 passes through the main ray beam of the collimator 2 and is aligned with the detector module 3. Controller module 3.

Those skilled in the art should understand that the X-ray and gamma-ray sources mentioned in the present invention may be other ray sources. The ray beam mentioned in the present invention refers to any form of ray used for irradiation, which may be a pencil beam, a fan-shaped ray, or any other desired ray form.

Although the present invention has been particularly shown and described with reference to exemplary embodiments of the present invention, those skilled in the art should understand that, without departing from the spirit and scope of the present invention as defined by the appended claims, other The embodiments undergo various changes in form and detail.

Claims (8)

1., for an alignment system for container or vehicle inspection system, it is characterized in that,

Comprise measurement module, measurement module is the sensor array that multiple sensor is formed, and each sensor is configured to measure transmitted intensity;

A sensor in measurement module is arranged on the longitudinal centre line of the detector module of container or vehicle inspection system, when the transmitted intensity value of the described sensor measurement be arranged on the longitudinal centre line of detector module of measurement module is the maximal value of transmitted intensity value curve, determine ray alignment detector module.

2., as claimed in claim 1 for the alignment system of container or vehicle inspection system, it is characterized in that,

The detector module of described sensor array and container or vehicle inspection system relative to each other generally perpendicularly arranged.

3., for an alignment system for container or vehicle inspection system, it is characterized in that,

Comprise measurement module, described measurement module is the rows of sensors that multiple sensor is formed, and each sensor is configured to measure transmitted intensity;

A sensor in described measurement module is arranged on the longitudinal centre line of the detector module of container or vehicle inspection system, when the transmitted intensity value of the described sensor measurement be arranged on the longitudinal centre line of detector module of measurement module is the maximal value of transmitted intensity value curve, determine ray alignment detector module.

4., as claimed in claim 3 for the alignment system of container or vehicle inspection system, it is characterized in that,

The detector module relative to each other substantially vertical arranged of described rows of sensors and container or vehicle inspection system.

5. the alignment system for container or vehicle inspection system as described in claim 3 or 4, is characterized in that,

Described sensor is minimonitor, the size of described minimonitor is less than the detector crystal size of the detector module of container or vehicle inspection system, and a minimonitor in described measurement module is arranged on the longitudinal centre line of the detector module of container or vehicle inspection system.

6. the alignment system for container or vehicle inspection system as described in claim 3 or 4, is characterized in that,

The described sensor be arranged on the longitudinal centre line of the detector module of container or vehicle inspection system is the sensor of described measurement module mid point.

7., as claimed in claim 6 for the alignment system of container or vehicle inspection system, it is characterized in that,

The ray alignment detector module by collimating apparatus is determined when the transmitted intensity value being positioned at the sensor measurement of detector module midpoint on measurement module is maximum.

8. the check system for container or vehicle, the detector module comprising radiographic source, collimating apparatus, detector arm and be arranged on detector arm, radiographic source, collimating apparatus and detector module are arranged to be formed and check passage, the ray that radiographic source is launched incides inspected object through collimating apparatus has collected inspection by detector module, it is characterized in that

Also comprise the alignment system according to any one of claim 1 to 7.