A stacked pixel array particle detection system and control method thereof

Abstract

The present invention provides a stacked pixel array particle detection system and a control method thereof, which belongs to the field of particle detection, and includes a plurality of particle detectors, a pixel array detector, a signal acquisition module and a main control module, wherein the particle detector and the pixel array detector are stacked in the particle incident direction, and the particle detector is used to receive the incident particles; the signal acquisition module is used to process and transmit the electrical signal detected by the particle detector to the main control module, and the main control module is used to generate the timing signal required for the pixel array detector to work according to the electrical signal of the particle detector, so as to obtain the image data of the pixel array detector, and store the image data with reference to the particle event count value of the particle detector; the pixel array detector is used to obtain and store the image data of the incident particles under the control of the generated timing signal. The present invention can reduce the amount of data collected while ensuring that the space particles are detected, and alleviate the pressure of data storage and downlink.

Description

Technical Field

[0001] The present invention belongs to the field of particle detection, and in particular relates to a stacked pixel array particle detection system and a control method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, pixel array detectors based on silicon detectors have been gradually applied to the field of particle detection. Pixel array detectors etch millions of pixels on a single piece of silicon. A single chip is equivalent to millions of silicon detectors. The chip integrates an independent readout circuit for each pixel. Due to its micron-level size, the incident position of the particle can be accurately located. Using two coaxially placed pixel array detectors, the incident direction of the particle can be determined by the incident coordinates of the particle and the vertical distance between the detectors. In addition, after incident particles of different energies hit the central pixel on the pixel array chip, the diffusion of their energy in the surrounding pixels is also different, which is of great help to scientific problems such as particle source exploration and particle identification in the field of space science.

[0004] The related art provides a pixel array detector image reading device, an image reading and transmission method, and the image reading device may include a pixel array detector, a control mainboard and a support structure. The pixel array detector may be a linear sensor such as a CCD or CMOS Sensor. The control mainboard provides a control signal for the operation of the pixel array detector, reads the data output by the pixel array detector, and transmits the data to the host computer through a communication interface after processing. For image devices with million-level pixel array detectors, the communication interface usually uses a serial communication interface or a Gigabit Ethernet interface with a high communication rate. The pixel array detector needs to set an exposure time. The shorter the exposure time, the higher the data frame rate generated by the pixel array detector, and the higher the required interface communication rate. The support structure is used to install the pixel array detector and the control mainboard.

[0005] When the pixel array detector is working on the ground, the collected images can be processed in real time, and the storage and transmission of data will not become a constraint on its work. However, when multiple pixel array detectors with a data collection rate of tens of MB per second are used in payloads carried by satellites or space stations, the collected data can only be sent back to the ground for processing, and the data can only be transmitted when the aircraft is staring at the ground receiving station. Therefore, the pressure on data storage and transmission on the aircraft host computer will increase. Although the rate at which the aircraft transmits data to the ground is comparable to the ground 5G communication rate, there are more than one payload on board the aircraft, so the contradiction between the amount of collected data and data storage and transmission will still become a bottleneck for such payloads working in space. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes a stacked pixel array particle detection system and a control method thereof. The present invention can reduce the amount of collected data while ensuring that space particles are detected, thereby alleviating the pressure of data storage and downlink.

[0007] According to some embodiments, the present invention adopts the following technical solutions:

[0008] A stacked pixel array particle detection system includes a plurality of particle detectors, a pixel array detector, a signal acquisition module and a main control module, wherein:

[0009] The particle detector and the pixel array detector are stacked in the particle incident direction, and the particle detector is used to receive incident particles;

[0010] The signal acquisition module is used to collect, amplify and convert the electrical signals detected by the particle detector into digital signals and transmit them to the main control module to distinguish whether there are particle events and count particle events;

[0011] The main control module is used to generate a timing signal required for the operation of the pixel array detector according to the electrical signal of the particle detector, so as to obtain image data of the pixel array detector, and store the image data with reference to the particle event count value of the particle detector;

[0012] The pixel array detector is used to acquire and store image data of incident particles under the control of the generated timing signal.

[0013] As an optional implementation, the particle detector is arranged above, below, or above and below the pixel array detector, and the two are arranged coaxially;

[0014] If there are more than two particle detectors or pixel array detectors, the particle detectors and pixel array detectors are cross-stacked and the number of the particle detectors is greater than or equal to the number of the pixel array detectors.

[0015] As an optional embodiment, the particle detector is a silicon detector.

[0016] As an optional implementation, the signal acquisition module includes a signal acquisition circuit, a signal amplification circuit and an A / D conversion circuit. The signal acquisition circuit is used to acquire the electrical signal of the particle detector, the signal amplification circuit is used to amplify the electrical signal, and the A / D conversion circuit is used to convert the amplified electrical signal into a digital signal.

[0017] As a further step, if the digital signal is greater than or equal to a set threshold, the main control module determines that a particle event is detected; otherwise, it determines that no particle event is detected.

[0018] As an optional implementation, the main control module is also connected to an aircraft host computer. The main control module packages the image data and the detection data of the particle detector and transmits them to the aircraft host computer, so that the data can be transmitted to the ground when the aircraft passes by.

[0019] As an optional implementation, the main control module is configured to: use the particle event count value collected by the particle detector during the last exposure time of the pixel array detector as the basis for setting the current exposure time of the pixel array detector; the more particle event count values, the smaller the current exposure time is set.

[0020] As an optional embodiment, the main control module is configured to: when the pixel array detector has a cached image, check whether the particle detector detects a particle event within the exposure time of the pixel array detector collecting the cached image; if the particle detector detects a particle event within the exposure time, store the cached image; otherwise, store the image using a preset storage ratio.

[0021] The control method based on the above system includes the following steps:

[0022] A timing signal required for the operation of the pixel array detector is generated according to the electrical signal of the particle detector to obtain image data of the pixel array detector, and the image data is stored with reference to the particle event count value of the particle detector.

[0023] As an optional implementation, the process of generating the timing signal required for the pixel array detector to work according to the electrical signal of the particle detector includes:

[0024] According to the particle event count value collected by the particle detector during the last exposure time of the pixel array detector, the current exposure time of the pixel array detector is set as the basis. The more the particle event count value is, the smaller the current exposure time is set.

[0025] As a further example, when the last exposure time value is t1, if the particle event count value detected by the particle detector within the time t1 is greater than the set discrimination value N1, the exposure time of the pixel array detector for the current operation is changed to t2, wherein t1 is greater than t2;

[0026] When the last exposure time value is t2, if the particle event count value detected by the particle detector within t2 is less than the discrimination value N2, the exposure time of the current operation of the pixel array detector is changed to t1, N1 and N2 are pre-configured, and N1 / t1 is greater than N2 / t2.

[0027] As an optional embodiment, the process of storing image data with reference to the particle event count value of the particle detector includes: when the pixel array detector has a cached image, checking whether the particle detector detects a particle event within the exposure time of the pixel array detector collecting the cached image, if the particle detector detects a particle event within the exposure time, storing the cached image; otherwise, storing the image using a preset storage ratio.

[0028] As a further step, the preset storage ratio is used to store the image: the preset storage ratio Q / P is used to store the image, that is, Q frames are stored for every P frames of image, where P≥Q, P and Q are preset values, and the implementation process includes:

[0029] Initialize the count of stored images s and the count of discarded images d, and count with P frames as a batch; each time a frame is stored, the value of s increases by 1; each time a frame is discarded, the value of d increases by 1; at the beginning of each batch, the values ​​of s and d are 0, and the storage count is performed first. When the value of s is equal to Q, the discard count is performed until the value of d is equal to PQ, that is, the images from the Q+1th frame to the Pth frame are discarded, the current batch processing is completed, and the values ​​of s and d are reset to zero; if the particle detector detects a particle event during a batch processing, the values ​​of s and d are reset to zero, and the image storage of a new batch is restarted;

[0030] The Q frame image is stored first, and the PQ frame image is discarded later;

[0031] Or, discard the PQ frame image first, and then store the Q frame image;

[0032] Or, the Q frame images are stored in the P frame images, that is, in the P frame images, Q frames are stored at intervals. x frame image, and then discard D x Frame images, or interval discard D x Frame image re-storage Q x Frame image, where Q x [1,Q], and , D x [0,PQ], and .

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention realizes spatial environment particle flux adaptation by analyzing the data collected by the particle detector within the exposure time of the pixel array detector, thereby limiting the data volume of the pixel array detector in terms of image acquisition and image storage. The pixel array detector exposure time and image storage can be effectively and adaptively adjusted according to the detection environment conditions to improve the efficiency of particle detection and reduce data redundancy, reduce data storage volume, improve data validity, and reduce data transmission pressure.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0037] Figure 1 (a) is a schematic diagram of the first stacked pixel array detection structure;

[0038] Figure 1(b) is a schematic diagram of the second stacked pixel array detection structure;

[0039] Figure 1 (c) is a schematic diagram of the third stacked pixel array detection structure;

[0040] Figure 1 (d) is a schematic diagram of the fourth stacked pixel array detection structure;

[0041] Figure 1(e) is a schematic diagram of the fifth stacked pixel array detection structure;

[0042] FIG1( f ) is a schematic diagram of the sixth stacked pixel array detection structure;

[0043] FIG1( g ) is a schematic diagram of the seventh stacked pixel array detection structure;

[0044] FIG1(h) is a schematic diagram of the eighth stacked pixel array detection structure;

[0045] Figure 2 is a schematic diagram of a stacked pixel array particle detection system according to an embodiment;

[0046] Figure 3 is a data acquisition control flow chart of an embodiment;

[0047] Figure 4 is a silicon detector particle counting control flow chart of an embodiment;

[0048] Figure 5 is a pixel array image storage flow chart of an embodiment;

[0049] Figure 6 is a flow chart of storing images according to a preset ratio Q / P in an embodiment;

[0050] Figure 7 is a flow chart of storing images according to a preset ratio Q / P in the second embodiment;

[0051] Figure 8 is a flow chart of storing images according to a preset ratio Q / P in the third embodiment;

[0052] Fig. 9 This is a flow chart of storing images according to a preset ratio Q / P in the fourth embodiment. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0054] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0057] Embodiment 1

[0058] A stacked pixel array particle detection system, in this embodiment, is described by taking a silicon detector as the selected particle detector, but this does not mean that in other embodiments, the particle detector can only be a silicon detector.

[0059] A stacked pixel array particle detection system includes a plurality of particle detectors, a pixel array detector, a signal acquisition module and a main control module, wherein:

[0060] The particle detector and the pixel array detector are stacked in the particle incident direction to form a stacked pixel array detector structure, and the particle detector is used to receive incident particles;

[0061] The signal acquisition module is used to collect, amplify and convert the electrical signals detected by the particle detector into digital signals and transmit them to the main control module to distinguish whether there are particle events and count particle events;

[0062] The main control module is used to generate a timing signal required for the operation of the pixel array detector according to the electrical signal of the particle detector, so as to obtain image data of the pixel array detector, and store the image data with reference to the particle event count value of the particle detector;

[0063] The pixel array detector is used to acquire and store image data of incident particles according to the generated timing signal.

[0064] The stacked pixel array detector structure, that is, the silicon detector and the pixel array detector are stacked in the particle incident direction. The detection signal of the silicon detector is used as the basis for setting the exposure time of the pixel array detector and acquiring image storage. They can be placed above the pixel array detector as shown in Figure 1 (a), or below the pixel array detector as shown in Figure 1 (b), or both above and below as shown in Figure 1 (c) and Figure 1 (d).

[0065] When two pixel array detectors are needed to achieve scientific goals such as particle source exploration and particle identification in practical applications, the silicon detectors can be located at different positions of the two pixel array detectors, as shown in Figure 1 (e)-Figure 1 (h), that is, silicon detector-pixel array detector-silicon detector-pixel array detector, or silicon detector-pixel array detector-silicon detector-pixel array detector-silicon detector, etc., and the direction of the incident particles can be from above or from below.

[0066] like Figure 2 As shown, the whole system includes a power supply circuit, a silicon detector and its signal acquisition circuit, a pixel array detector, a main control module and a data transmission module. The silicon detector signal acquisition module includes a signal acquisition circuit, a signal amplification circuit and an A / D conversion circuit, which collects, amplifies and converts the electrical signal of the silicon detector into a digital signal for the main control module to distinguish whether there are particle events and count particle events. The main control module generates the timing signal required for the pixel array detector to work, collects the image data of the pixel array detector, and then refers to the particle event count value of the silicon detector and stores it according to a certain strategy. Finally, the image data and silicon detector data are packaged and uploaded to the aircraft host computer through the data transmission interface, and the data is transmitted to the ground when the aircraft passes.

[0067] To solve the bottleneck of data storage and transmission, this embodiment uses the particle event count value detected by the silicon detector within the exposure time of the pixel array detector as a basis to limit the data volume from two aspects of pixel array detector data collection and storage.

[0068] The first step is data collection. The data collection control flow chart is as follows Figure 3 shown.

[0069] For pixel array detectors, the shorter the exposure time, the more image frames are collected per unit time, and the larger the amount of data obtained. Under normal circumstances, the number of particle events in the space environment is relatively small, and the exposure time of the pixel array detector uses a larger value t1; when there is a solar storm or the spacecraft passes through an area with a high particle flux, the exposure time of the pixel array detector uses a smaller value t2, so that different levels of image data are obtained in different situations, which can not only reduce the collected image data but also ensure that data is not missed; the values ​​of t1 and t2 can be changed through remote control commands based on the actual data obtained by the silicon detector after the spacecraft enters orbit.

[0070] In this embodiment, the count value of the particle events collected by the silicon detector during the previous exposure time of the pixel array detector is used as the basis for setting the current exposure time of the pixel array detector. Different exposure times correspond to different particle event count discrimination values.

[0071] For example, when the last exposure time value is t1, if the number of particle events detected by the silicon detector within t1 is greater than the discrimination value N1, it is considered that the aircraft is in an area with a higher particle flux, and the exposure time of the pixel array detector for the current operation is changed to t2 to increase the data collection amount and prevent particle events from being missed; when the last exposure time value is t2, if the number of particle events detected by the silicon detector within t2 is less than the discrimination value N2, it is considered that the aircraft is in an area with a lower particle flux, and the exposure time of the pixel array detector for the current operation is changed to t1 to reduce the data collection amount and reduce invalid data; N1 and N2 can also be changed through remote control commands.

[0072] Whether the silicon detector detects a particle event can be determined by a threshold. When the silicon detector output value is collected, amplified, and converted into a digital value v, it is compared with the preset threshold V. When v ≥ V, it is considered that a particle event is detected; otherwise, no particle event is detected. The silicon detector control process is as follows: Figure 4 shown.

[0073] The second is data storage. In the standard working mode, the pixel array detector can collect dozens of frames of images per second, and the data volume of each frame is at the MB level. Most of the data in these images is invalid information. If all the data are stored, the pressure on data storage and transmission will be very high. In view of this, in addition to using the method described above to reduce the acquisition frequency, this embodiment also provides a method to limit the data storage volume.

[0074] This embodiment is described by taking an example where silicon detectors are placed on both the upper and lower sides coaxially and parallel to the pixel array detector.

[0075] This embodiment designs an image storage strategy based on the detection of particles by the silicon detector as a necessary condition for saving pixel array images. The image storage flow chart is as follows: Figure 5 As shown, when the pixel array detector has a cached image, it is checked whether the silicon detector detects a particle event during the exposure time of the pixel array detector to collect the image. If the particle event count detected by the silicon detector during the exposure time is greater than 0, the image is stored; otherwise, the image is stored using a preset storage ratio Q / P, that is, Q frames are stored for every P frames of image, where P≥Q, P and Q are preset values ​​and can be changed by remote control commands.

[0076] In specific implementation, according to the preset ratio Q / P, the image storage process can be designed to count the number of stored images s and the number of discarded images d, with P frames of images as a batch for counting; each time a frame of image is stored, the s value is increased by 1; each time a frame of image is discarded, the d value is increased by 1; at the beginning of each batch, the s and d values ​​are 0, and the storage count is performed first. When the s value is equal to Q, the discard count is performed until the d value is equal to PQ, that is, the Q+1 frame to the P frame image is discarded, the current batch processing is completed, and the s and d values ​​are reset. If the silicon detector detects a particle event during a batch processing, the s and d values ​​are reset to zero, and a batch of image storage is restarted.

[0077] When storing images according to the ratio Q / P in the above text, the Q frame image is stored first, and the PQ frame image is discarded. The control flow is as follows: Figure 6 shown.

[0078] or Figure 7 As shown, the PQ frame image is discarded first, and then the Q frame image is stored; or as Figure 8 As shown, the Q frame images are stored in the P frame images, that is, in the P frame images, Q frames are stored at intervals. x Frame image is discarded again x frame image, or Fig. 9 As shown, the interval D is discarded x Frame image re-storage Q x Frame image, where Q x [1,Q], and , D x [0,PQ], and .

[0079] In this embodiment, the particle flux adaptation of the space environment is realized by analyzing the data collected by the silicon detector during the exposure time of the pixel array detector, thereby limiting the data volume of the pixel array detector in terms of image acquisition and image storage. Assuming that the average proportion of the area with high particle flux during one orbit of the aircraft around the earth is 1 / z, the exposure time of the pixel array detector in the area with low particle flux is x seconds, and the exposure time of the pixel array detector in the area with high particle flux is y seconds, and the standard working mode of the pixel array detector is m frames of data per second, then the ratio of the image acquisition data volume to the standard working mode data volume is:

[0080] ;

[0081] The images are stored according to the ratio Q / P, and the ratio of the total storage data volume to the standard working mode data volume is Effectively and adaptively adjust the exposure time and image storage of the pixel array detector according to the detection environment to improve the efficiency of particle detection and reduce data redundancy, reduce data storage volume, improve data validity, and reduce data transmission pressure.

[0082] In some embodiments, when there are two pixel array detectors, if the two pixel array detectors are the same, the data acquisition and storage settings are configured using the same values; if different pixel array detectors are used, they can be set using the setting method provided in the above embodiment, and the specific values ​​of the two pixel array detectors can be different.

[0083] It should be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of one or more computer-usable storage media (including but not limited to disk storage, CD - ROM , optical memory, SD card, FLASH memory, etc.).

[0084] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0085] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. A stacked pixel array particle detection system, characterized in that: It includes several particle detectors, pixel array detectors, signal acquisition modules and main control modules, among which: The particle detector and the pixel array detector are stacked in the particle incident direction, and the particle detector is used to receive incident particles; The signal acquisition module is used to collect, amplify and convert the electrical signals detected by the particle detector into digital signals and transmit them to the main control module to distinguish whether there are particle events and count particle events; The main control module is used to generate the timing signal required for the operation of the pixel array detector according to the electrical signal of the particle detector, so as to obtain the image data of the pixel array detector, and store the image data with reference to the particle event count value of the particle detector; the process of generating the timing signal required for the operation of the pixel array detector according to the electrical signal of the particle detector is as follows: according to the particle event count value collected by the particle detector during the last exposure time of the pixel array detector, the current exposure time of the pixel array detector is set as the basis, and the more the particle event count value, the smaller the current exposure time is set; The pixel array detector is used to acquire and store image data of incident particles under the control of the generated timing signal.

2. A stacked pixel array particle detection system as claimed in claim 1, characterized in that: The particle detector is arranged above, below, or above and below the pixel array detector, and the particle detector and the pixel array detector are arranged coaxially; If there are more than two particle detectors or pixel array detectors, the particle detectors and pixel array detectors are cross-stacked and the number of the particle detectors is greater than or equal to the number of the pixel array detectors.

3. A stacked pixel array particle detection system as claimed in claim 1, characterized in that: The signal acquisition module includes a signal acquisition circuit, a signal amplification circuit and an A / D conversion circuit. The signal acquisition circuit is used to acquire the electrical signal of the particle detector, the signal amplification circuit is used to amplify the electrical signal, and the A / D conversion circuit is used to convert the amplified electrical signal into a digital signal.

4. A stacked pixel array particle detection system as claimed in claim 1 or 3, characterized in that: The main control module is also connected to an aircraft host computer, and the main control module packages the image data and the detection data of the particle detector and transmits them to the aircraft host computer; If the digital signal is greater than or equal to the set threshold, the main control module determines that a particle event is detected; otherwise, it determines that no particle event is detected.

5. A stacked pixel array particle detection system as claimed in claim 1, characterized in that: The main control module can also be configured to: when the pixel array detector has a cached image, check whether the particle detector detects a particle event within the exposure time of the pixel array detector collecting the cached image; if the particle detector detects a particle event within the exposure time, store the cached image; otherwise, use a preset storage ratio to store the image.

6. A control method based on the system according to any one of claims 1 to 5, characterized in that: The following steps are involved: When the last exposure time value is t1, if the particle event count value detected by the particle detector within t1 is greater than the set discrimination value N1, the exposure time of the pixel array detector for the current operation is changed to t2, where t1 is greater than t2; When the last exposure time value is t2, if the particle event count value detected by the particle detector within t2 is less than the discrimination value N2, the exposure time of the current operation of the pixel array detector is changed to t1, N1 and N2 are pre-configured, and N1 / t1 is greater than N2 / t2.

7. The control method according to claim 6, characterized in that, referring to The process of storing image data based on the particle event count value of the particle detector includes: when the pixel array detector has a cached image, checking whether the particle detector detects a particle event within the exposure time of the pixel array detector collecting the cached image, if the particle detector detects a particle event within the exposure time, storing the cached image; otherwise, storing the image using a preset storage ratio.

8. The control method according to claim 7, characterized in that: The preset storage ratio is used to store images: the preset storage ratio Q / P is used to store images, that is, Q frames are stored for every P frames of images, where P≥Q, P and Q are preset values, and the implementation process includes: Initialize the count of stored images s and the count of discarded images d, and count with P frames as a batch; each time a frame is stored, the value of s increases by 1; each time a frame is discarded, the value of d increases by 1; at the beginning of each batch, the values ​​of s and d are 0, and the storage count is performed first. When the value of s is equal to Q, the discard count is performed until the value of d is equal to PQ, that is, the images from the Q+1th frame to the Pth frame are discarded, the current batch processing is completed, and the values ​​of s and d are reset to zero; if the particle detector detects a particle event during a batch processing, the values ​​of s and d are reset to zero, and the image storage of a new batch is restarted; The Q frame image is stored first, and the PQ frame image is discarded later; Or, discard the PQ frame image first, and then store the Q frame image; Or, the Q frame images are stored in the P frame images, that is, in the P frame images, Q frames are stored at intervals. x frame image, and then discard D x Frame images, or interval discard D x Frame image re-storage Q x Frame image, where Q x [1,Q], and , D x [0,PQ], and .

Images