CN113552145A - Data acquisition control device and security check system of detector array - Google Patents
Data acquisition control device and security check system of detector array Download PDFInfo
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- CN113552145A CN113552145A CN202110866244.8A CN202110866244A CN113552145A CN 113552145 A CN113552145 A CN 113552145A CN 202110866244 A CN202110866244 A CN 202110866244A CN 113552145 A CN113552145 A CN 113552145A
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- 230000010354 integration Effects 0.000 claims abstract description 60
- 238000006073 displacement reaction Methods 0.000 claims abstract description 41
- 238000005070 sampling Methods 0.000 claims abstract description 40
- 238000007689 inspection Methods 0.000 claims abstract description 37
- 230000005855 radiation Effects 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 description 27
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- 230000009286 beneficial effect Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/10—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being confined in a container, e.g. in a luggage X-ray scanners
Abstract
The invention relates to a data acquisition control device of a detector array and a security inspection system, and belongs to the technical field of automatic control. The device comprises: the displacement sensor, include a plurality of detectors and the detector array of the integrating circuit that corresponds the connection, and the controller, displacement sensor is connected to the input of controller, and each integrating circuit is connected in the control of the output control of controller, and integrating circuit output connection controller for carry out the initial time and the integration time of integration according to displacement sensor's pulse signal control integrating circuit, obtain the sampling data of detector. The integration circuit in the detector array of the invention integrates according to the pulse signal of the displacement sensor, sends out a pulse signal, the integration circuit starts integrating, and the integration time is equal to the pulse width, so that the sampling data of the detector and the scanning distance of the corresponding parcel are equal and independent of the speed, and the image deformation caused by the change of the moving speed of the parcel can be avoided.
Description
Technical Field
The invention relates to a data acquisition control device of a detector array and a security inspection system, and belongs to the technical field of automatic control.
Background
The conventional X-ray machine security inspection equipment generally sets the sampling period of a signal in advance according to the technical requirements of the specification, the arrangement, the resolution, the rated running speed of a parcel conveyor and the like of a detector array, and each sampling period (or sampling interval) is equal. The sampling system of the device works according to the sampling period, and in continuous work, the sampling period cannot change along with the change of the moving speed of the detected object, so that the length of the object corresponding to the data sampled every time changes when the moving speed of the detected object changes. When the moving speed of the object is higher than the rated speed, the length of the object corresponding to the sampled data is longer than the rated speed, and the corresponding image is compressed, otherwise, when the moving speed of the object is lower than the rated speed, the length of the object corresponding to the sampled data is shorter than the rated speed, and the corresponding image is stretched, so that the image is deformed.
On the other hand, it is often seen that when an object is scanning in the inspection passage, the conveyor suddenly stops moving for some reason, and the scanning operation is interrupted. If the transport device resumes operation, image distortion may occur because the transport device does not initially reach the rated speed. To solve this problem, a method is often used in which the conveyor is reversed one section and then rotated forward. Thus, when the part of the object which is not scanned passes through the fan-beam area, the same speed as the rated speed is obtained, the undistorted image of the rest part is obtained, and the undistorted image is spliced with the original image to form a complete image.
In the case of logistics and where high speeds are required, the transport device will be frequently started and stopped, but the inversion is not allowed. In such a case, an image deformation phenomenon occurs, and it is difficult to realize seamless stitching of images, and an inspection system may fail to detect.
In summary, the conventional security inspection image is easily deformed, which results in a decrease in security inspection reliability.
Disclosure of Invention
An object of the application is to provide a data acquisition controlling means and security check system of detector array for solve the problem that current security check image warp, security check reliability is low.
In order to achieve the above object, the present application provides a technical solution of a data acquisition control device for a detector array, the device including:
the displacement sensor is arranged on the safety inspection machine conveying device, so that the displacement sensor sends out a pulse signal every time the safety inspection machine conveying device transmits a set distance;
the detector array comprises a plurality of detectors and integration circuits which are correspondingly connected, and is used for receiving the transmitted X-rays in the security check scanning process and sampling the received X-rays;
the controller is connected with the input end of the controller, the output end of the controller is connected with each integration circuit in a control mode, the output end of each integration circuit is connected with the controller, the controller is used for controlling the initial time and the integration time of the integration circuits according to the pulse signals of the displacement sensors to obtain sampling data of the detector, the initial time is the time point corresponding to the rising edge of the pulse signals, and the integration time is the width of the pulse signals.
The technical scheme of the data acquisition control device of the detector array has the beneficial effects that: the integration circuit in the detector array of the invention integrates according to the pulse signal of the displacement sensor, sends out a pulse signal, the integration circuit starts integrating, and the integration time is equal to the pulse width, so that the sampling data of the detector and the scanning distance of the corresponding parcel are equal and independent of the speed, and the image deformation caused by the change of the moving speed of the parcel can be avoided. Meanwhile, if the package completely stops moving, namely the transmission of the transmission device of the security inspection machine stops, the displacement sensor also stops pulse output, sampling/integration also stops, when the package restarts to move, the displacement sensor outputs pulses, the sampling/integration restarts, and each subsequent line of sampling data is arranged behind the line of data stopped, so that a complete undistorted image can be formed, and the original jigsaw problem is solved.
Furthermore, the sampling data in the interval duration of the pulse signal is the sampling data after the integration of the previous pulse signal.
Furthermore, the detector array also comprises a plurality of signal conditioning circuits, and the detector is connected with the integrating circuit through the signal conditioning circuits.
Furthermore, the integrating circuit is connected with the controller through the output of the analog-digital conversion circuit.
In addition, this application still provides a technical scheme of security check system, and the security check system includes security check machine conveyor, security check passageway, is used for sending triggering signal's trigger and being used for launching X ray after the parcel reaches the assigned position, carries out the ray source that scans to the parcel, its characterized in that, still includes detector array's data acquisition controlling means, and detector array's data acquisition controlling means includes:
the displacement sensor is arranged on the safety inspection machine conveying device, so that the displacement sensor sends out a pulse signal every time the safety inspection machine conveying device transmits a set distance;
the detector array comprises a plurality of detectors and integration circuits which are correspondingly connected, and is used for receiving the transmitted X-rays in the security check scanning process and sampling the received X-rays;
the controller is connected with the input end of the controller, the output end of the controller is connected with each integration circuit in a control mode, the output end of each integration circuit is connected with the controller, the controller is used for controlling the initial time and the integration time of the integration circuits according to the pulse signals of the displacement sensors to obtain sampling data of the detector, the initial time is the time point corresponding to the rising edge of the pulse signals, and the integration time is the width of the pulse signals.
The technical scheme of the security inspection system has the beneficial effects that: the integration circuit of the detector array in the security inspection system provided by the invention integrates according to the pulse signal of the displacement sensor, sends out a pulse signal, the integration circuit starts integrating, and the integration time is equal to the pulse width, so that the sampling data of the detector is equal to the scanning distance of the corresponding parcel and is independent of the speed, and the image deformation caused by the change of the moving speed of the parcel can be avoided. Meanwhile, if the package completely stops moving, namely the transmission of the transmission device of the security inspection machine stops, the displacement sensor also stops pulse output, sampling/integration also stops, when the package restarts to move, the displacement sensor outputs pulses, the sampling/integration restarts, and each subsequent line of sampling data is arranged behind the line of data stopped, so that a complete undistorted image can be formed, and the original jigsaw problem is solved.
Furthermore, the sampling data in the interval duration of the pulse signal is the sampling data after the integration of the previous pulse signal.
Furthermore, the detector array also comprises a plurality of signal conditioning circuits, and the detector is connected with the integrating circuit through the signal conditioning circuits.
Furthermore, the integrating circuit is connected with the controller through the output of the analog-digital conversion circuit.
Further, the trigger is a light barrier.
Further, the light barrier is arranged in the security inspection channel and close to the entrance of the security inspection channel.
Drawings
FIG. 1 is a block diagram of the security system of the present invention;
FIG. 2 is a schematic view of a package scan of the present invention;
FIG. 3 is a control circuit diagram of the data acquisition control arrangement of the detector array of the present invention;
FIG. 4 is a timing diagram of data acquisition for a detector array of the present invention;
in the figure: the system comprises an upper computer 1, a detector array 2, a data acquisition and transmission unit 3, a displacement sensor 4, a G1 light barrier 5, a control unit 6, a radiation source 7 and a security inspection machine conveying device 8.
Detailed Description
Embodiment of the security inspection system:
the invention has the main conception that based on the problem of image deformation caused by different wrapping speeds, the detector array carries out integral sampling according to pulse signals of the displacement sensor, and the displacement sensor acquires the transmission distance of the conveying device of the security inspection machine, so that the speed is irrelevant, and the phenomenon that the image is not deformed is ensured.
The security inspection system provided by the embodiment is shown in fig. 1 and 2, and comprises an upper computer 1, a detector array 2, a data acquisition and transmission unit 3, a displacement sensor 4, a G1 light barrier 5, a control unit 6, a radiation source 7 and a security inspection machine conveying device 8. The detector array 2, the data acquisition and transmission unit 3 and the displacement sensor 4 form a data acquisition control device of the detector array 2, so that the data acquisition control of the detector array 2 is realized, wherein the data acquisition and transmission unit 3 is used as a controller, and the sampling time sequence of the detector array 2 is also controlled on the basis of data transmission.
The security inspection machine conveying device 8 comprises a motor and a conveying belt, the motor drags the conveying belt to move, packages are placed on the conveying belt, and the conveying belt can move to drive the packages to move.
The safety inspection machine conveying device 8 is provided with a displacement sensor 4, and the displacement sensor 4 sends out a pulse signal when the conveying belt moves for a certain distance (the scanned package moves with the conveying belt at the same time, so that the scanned package moves for a certain distance at the same time, namely, the scanned package moves for a certain distance at the same time).
A security check channel is arranged above a security check machine conveying device 8, a radiation source 7 is arranged below the security check machine conveying device 8 and corresponds to the position of the security check channel, a detector array 2 is arranged at the top of the security check channel, the radiation source 7 is used for emitting X rays, the detector array 2 is a linear array detector and is composed of a plurality of receiving devices (each receiving device comprises a detector and a related circuit), and the receiving devices are arranged in a straight line in the X ray emitting direction. The radiation source 7 generally adopts a collimator to shape a conical beam emitted by a ray tube into a fan-shaped beam so as to be matched with the linear array detector; the linear array detector receives X-rays transmitted through the envelope from the radiation source 7.
The detector array 2, as shown in fig. 3, includes a plurality of detectors, and a signal conditioning circuit, an integrating circuit, and an analog/digital converting circuit connected in sequence to each detector.
The G1 light barrier 5 is arranged inside the security channel and is generally fixed near the entrance of the security channel, and the G1 light barrier 5 comprises an infrared emitter and an infrared receiver oppositely arranged on both sides of the security channel. When the scanned parcel moves to the middle of infrared emitter and infrared receiver, the infrared ray that infrared emitter sent is sheltered from, and the signal that infrared receiver received changes, and the output is with the opposite signal when not sheltering from, consequently can judge whether the parcel is close to and leave according to the change of this signal, and then confirm the moment that ray source 7 opened and closed.
The connection relationship between each part and the control unit 6, the data acquisition and transmission unit 3 (i.e. the data processor in fig. 3) and the upper computer 1 is shown in fig. 3, the displacement sensor 4 is connected with the input end of the data acquisition and transmission unit 3, the output end of the data acquisition and transmission unit 3 is connected with each integration circuit in a control way, and the output of each analog/digital conversion circuit in the detector array 2 is connected with the data acquisition and transmission unit 3; the upper computer 1 is in communication connection with the data acquisition and transmission unit 3. The data acquisition and transmission unit 3 is used for controlling the start time and the integration time of integration of each integration circuit according to the pulse signal of the displacement sensor 4, collecting the acquired data of the detector array 2, transmitting the data to the upper computer 1, and the upper computer 1 receives the data sent by the data acquisition and transmission unit 3 and displays the data on a screen according to a certain format.
The input end of the control unit 6 is connected with the G1 light barrier 5, and the output end is connected with the radiation source 7 and the motor of the security inspection machine conveying device 8. The control unit 6 is used for controlling the starting and stopping of the security inspection machine conveying device 8 and controlling the opening and closing of the radiation source 7 according to the signal change of the G1 light barrier 5.
In order to avoid the problem of image deformation caused by different transmission speeds, the whole process of the security inspection system is as follows:
1) and starting the machine, wherein the control unit 6 controls the motor to be powered on, and the conveying belt of the safety inspection machine conveying device 8 moves, so that the safety inspection machine conveying device 8 works.
2) The displacement sensor 4 pulses with the movement of the conveyor belt, and each time the conveyor belt moves a certain distance, the displacement sensor 4 sends out a corresponding pulse, for example: the displacement sensor 4 sends out 1 pulse every time the conveyor belt moves 1 mm.
3) The data acquisition and transmission unit 3 controls an integrating circuit to perform integral starting time and integral time and A/D conversion time according to the pulse of the displacement sensor 4 so as to obtain sampling data of each detector, and the sampling data of each detector on the linear array are combined in a serial mode, a parallel mode or a serial-parallel combined mode and are sent to the upper computer 1;
4) the host computer 1 performs format conversion on the received data to obtain a scanned image of the scanned parcel.
Specifically, the data acquisition and transmission unit 3 controls the integrating circuit and the upper computer 1 to perform the following processing procedures:
when the conveying belt moves for 1mm, the displacement sensor 4 detects the movement and sends 1 pulse, the data acquisition and transmission unit 3 controls the integration circuit to start integration, the detector array 2 outputs the acquired data (namely, the data after integration) once, and the data acquisition and transmission unit 3 obtains a line of data which is a row of pixel gray values corresponding to the image of the upper computer;
when the ray source 7 is not opened, the data output by the detector array 2 is data without X-ray irradiation, which is also called background data, and no image appears on the screen of the upper computer;
when a scanned package is placed on the safety inspection machine conveying device 8 and conveyed into a safety inspection channel, and the G1 light barrier 5 is triggered, the control unit 6 controls the radiation source 7 to be opened, because the radiation source 7 is not shielded by the package, the X-rays emitted by the radiation source 7 irradiate the detector array 2 without shielding, the data output by the detector array 2 is the strongest ray intensity, and the data is a full scale value;
when the scanned parcel blocks X-rays, namely the X-rays pass through the scanned parcel, the energy and the dose value of the rays collected by the detector array 2 are changed, the change quantity of the ray energy and the dose value has close relation with the thickness, the density and the type of the substances passing through the substances, and then relevant data included in the scanned item are output;
when the scanned parcel continues to move away from the scanning range of the X-ray, the control unit 6 controls the ray source 7 to be closed, and the scanning is finished.
In the above process, each time the displacement sensor 4 outputs a pulse, the data acquisition and transmission unit 3 acquires line data, the data acquisition and transmission unit 3 sorts the acquired line data, and transmits the line data or lines of data to the upper computer 1 according to a protocol, the upper computer 1 displays the data according to a certain format, and specifically, the sampling process of the control integration circuit of the data acquisition and transmission unit 3 is as shown in fig. 4:
every time the parcel moves a certain distance (as a in fig. 4, moves 1l, 2l, 3l, 4l, the corresponding time is T1、T2、T3、T4) I.e. the belt moves a certain distance, the displacement sensor 4 detects the movement and generates a pulse signal, as shown in b of fig. 4, the rising edge of the pulse signal corresponds to the position of the package, and therefore the corresponding time point is T1、T2、T3、T4The distance intervals of movement are equal, but the time intervals are not necessarily equal, depending on the transmission speed;
the X-ray traverses a transverse slice (direction of movement, perpendicular to the fan beam plane) of the object, and the signal value generated at each detector is a continuous signal, as shown at c in fig. 4;
under the action of the pulse signal, the integrating circuit is controlled to start integrating, and the starting time of the integrating is the time point corresponding to the rising edge of the pulse signal, namely T1、T2、T3、T4The integration time Δ t is the width of the pulse signal, the integration time Δ t is unchanged (the minimum interval between rising edges is smaller than that in normal operation, as shown in D of fig. 4, the signal value after integration is maintained until the next integration is started, that is, the sampling data in the interval duration of the pulse signal is the sampling data after the integration of the previous pulse signal, and finally, the analog-to-digital conversion circuit (that is, the a/D conversion circuit) converts the signal output by the integration circuit into a digital signal and outputs the digital signal to the data acquisition and transmission unit 3, and further, the digital signal is uploaded to the upper computer 1.
The host computer 1 firstly places the received data in a memory, calculates a characteristic value represented by each data in the data according to the characteristic that the X-ray passes through the substance, and maps each line data into line data, the line data are arranged to form two-dimensional data, and a complete scanning image is displayed on a screen through gray scale and color conversion, wherein each line data corresponds to each point of the object.
Of course, when the computer displays the images, the images of one package can be all displayed at one time; it is also possible to display several columns of data at a time, in a step-by-step manner, sometimes referred to as a "scroll".
In the above embodiment, the G1 light barrier 5 may be used as a photoelectric trigger to control the radiation source 7 to be turned on and off, and as another embodiment, a mechanical trigger may also be used to issue a trigger signal, which is not limited by the present invention.
In the above embodiments, the detector array 2 includes the signal conditioning circuit, the integrating circuit, and the analog/digital converting circuit, so that the data output by the detector array 2 has been processed, as another embodiment, the signal conditioning circuit, the integrating circuit, and the analog/digital converting circuit may also be used as separate devices to process the data collected by the detector.
The starting point of each sampling/integration of the detector array 2 is determined by the pulse signal sent by the displacement sensor 4, so that the distance of the package scanned corresponding to each output row of data is equal and is irrelevant to the scanning speed. Therefore, the variation in the moving speed of the object does not cause the distortion of the image. Meanwhile, if the conveying belt (i.e. the scanned package) completely stops moving, the displacement sensor 4 also stops pulse output, sampling/integration also stops, when the conveying belt restarts moving, the displacement sensor 4 outputs pulses, sampling/integration restarts, and each subsequent row of data is arranged behind the row of data stopped, so that a complete undistorted image can be formed, and the original jigsaw problem is well solved.
The data acquisition control device embodiment of the detector array:
the specific structure and working process of the data acquisition control device of the detector array are already described in the above security inspection system, and are not described herein again.
Claims (10)
1. A data acquisition control apparatus for a detector array, comprising:
the displacement sensor is arranged on the safety inspection machine conveying device, so that the displacement sensor sends out a pulse signal every time the safety inspection machine conveying device transmits a set distance;
the detector array comprises a plurality of detectors and integration circuits which are correspondingly connected, and is used for receiving the transmitted X-rays in the security check scanning process and sampling the received X-rays;
the controller is connected with the input end of the controller, the output end of the controller is connected with each integration circuit in a control mode, the output end of each integration circuit is connected with the controller, the controller is used for controlling the initial time and the integration time of the integration circuits according to the pulse signals of the displacement sensors to obtain sampling data of the detector, the initial time is the time point corresponding to the rising edge of the pulse signals, and the integration time is the width of the pulse signals.
2. The apparatus of claim 1, wherein the sampling data during the interval of the pulse signal is the sampling data after the integration of the previous pulse signal.
3. The data acquisition control device of the detector array as claimed in claim 1 or 2, further comprising a plurality of signal conditioning circuits, wherein the detectors are connected to the integrating circuit through the signal conditioning circuits.
4. The apparatus of claim 1 or 2, wherein the integrating circuit is connected to the controller via an analog-to-digital converter circuit.
5. The utility model provides a security check system, includes security check machine conveyor, security check passageway, is used for sending triggering signal's trigger and being used for launching X ray after the parcel reaches the assigned position, carries out the source of radiation that scans the parcel, its characterized in that still includes detector array's data acquisition controlling means, detector array's data acquisition controlling means includes:
the displacement sensor is arranged on the safety inspection machine conveying device, so that the displacement sensor sends out a pulse signal every time the safety inspection machine conveying device transmits a set distance;
the detector array comprises a plurality of detectors and integration circuits which are correspondingly connected, and is used for receiving the transmitted X-rays in the security check scanning process and sampling the received X-rays;
the controller is connected with the input end of the controller, the output end of the controller is connected with each integration circuit in a control mode, the output end of each integration circuit is connected with the controller, the controller is used for controlling the initial time and the integration time of the integration circuits according to the pulse signals of the displacement sensors to obtain sampling data of the detector, the initial time is the time point corresponding to the rising edge of the pulse signals, and the integration time is the width of the pulse signals.
6. The security system of claim 5, wherein the sampled data during the interval of the pulse signal is the sampled data after integration of the previous pulse signal.
7. The security inspection system of claim 5 or 6, wherein the detector array further comprises a plurality of signal conditioning circuits, and the detectors are connected to the integrating circuit through the signal conditioning circuits.
8. A security system according to claim 5 or claim 6, wherein the integrating circuit is connected to the controller via an analogue to digital conversion circuit output.
9. The security system of claim 5, wherein the trigger is a light barrier.
10. The security system of claim 9, wherein the light barrier is disposed within the security channel proximate an entrance of the security channel.
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Citations (6)
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| GB2138235A (en) * | 1983-04-05 | 1984-10-17 | Philips Nv | Computed tomography apparatus |
| US4710816A (en) * | 1985-09-30 | 1987-12-01 | Nippon Kogaku K. K. | Picture signal generating apparatus |
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| US20170164910A1 (en) * | 2014-08-26 | 2017-06-15 | Nanovision Technology (Beijing) Co., Ltd. | Stationary real time ct imaging system and method thereof |
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2021
- 2021-07-29 CN CN202110866244.8A patent/CN113552145A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138235A (en) * | 1983-04-05 | 1984-10-17 | Philips Nv | Computed tomography apparatus |
| US4710816A (en) * | 1985-09-30 | 1987-12-01 | Nippon Kogaku K. K. | Picture signal generating apparatus |
| WO1995012133A1 (en) * | 1993-10-29 | 1995-05-04 | Catalin Stoichita | System and sensor for scanning and digitising x-ray images |
| US20040251415A1 (en) * | 1995-10-23 | 2004-12-16 | Verbinski Victor V. | Density detection using real time discrete photon counting for fast moving targets |
| CN102361593A (en) * | 2009-03-25 | 2012-02-22 | 皇家飞利浦电子股份有限公司 | Apparatus and method for data acquisition using an imaging apparatus |
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