Industrial low-radiation ray digital imaging detection system and detection method thereof

Abstract

The invention provides an industrial low-radiation ray digital imaging detection system and a detection method thereof, and relates to the technical field of ray detection. The system comprises a pulse X-ray machine, a flat panel detector and control software, and the system realizes cooperative control and data interaction among all components through a communication interface. The pulse X-ray machine emits pulse X-rays according to set pulse width, frequency and quantity, and the flat panel detector receives the rays and converts the rays into electric signals to generate digital image data; the control software comprises a ray machine control module, an image acquisition module and an image processing and evaluation module, and realizes image acquisition, correction, enhancement and quality evaluation. All parts of the system are domestic, and the system has the advantages of high energy output, miniaturized structure, low radiation dose and the like, and is suitable for industrial nondestructive testing in the fields of petrochemical engineering, electric power, aerospace and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ray detection technology, in particular to an industrial low-radiation ray digital imaging detection system and a detection method thereof. BACKGROUND

[0002] In the process of engineering construction, the ray detection technology is an important means to ensure the welding quality and structural integrity. The traditional ray detection relies on film imaging, which not only has low efficiency and high labor cost, but also has problems such as high radiation intensity, high safety risk and the like. With the progress of image processing technology and nondestructive testing technology, the digital imaging technology gradually replaces the traditional film imaging and becomes the mainstream detection method in key fields such as petrochemical industry, electric power and aerospace.

[0003] At present, once the core equipment (including a pulsed X-ray machine, a flat panel detector and control software) of the industrial ray digital imaging detection system faces a supply interruption, it will seriously affect the construction progress and quality control of a major project. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an industrial low-radiation ray digital imaging detection system and a detection method thereof, which forms an industrial low-radiation ray digital imaging detection system by designing a pulsed X-ray machine, a flat panel detector and control software.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] An industrial low-radiation ray digital imaging detection system, comprising:

[0007] a pulsed X-ray machine, configured to emit pulsed X-rays with a preset pulse width, frequency and quantity according to a control instruction;

[0008] a flat panel detector, configured to receive the pulsed X-rays and convert them into corresponding electrical signals, and then generate digital image data through a readout circuit;

[0009] control software, configured with a ray machine control module, an image acquisition module and an image processing and evaluation module; the ray machine control module is configured to send an emission control instruction to the pulsed X-ray machine; the image acquisition module is configured to control the flat panel detector to acquire the digital image data corresponding to the pulsed X-rays according to preset parameters; and the image processing and evaluation module is configured to perform noise reduction, enhancement, signal-to-noise ratio and spatial resolution evaluation on the acquired digital image data;

[0010] a communication interface, configured to realize signal interaction between the control software and the pulsed X-ray machine and the flat panel detector.

[0011] Preferably, the control software is further configured with:

[0012] a synchronization control mechanism configured to trigger the pulsed X-ray machine to emit the pulsed X-rays at a set frequency after the flat panel detector sends a "ready" signal, the flat panel detector completes image integration acquisition in each pulse emission cycle and transmits all the digital image data to the control software for processing and output.

[0013] Preferably, the pulsed X-ray machine comprises:

[0014] an X-ray tube for emitting the pulsed X-rays upon receiving a high-voltage pulse signal;

[0015] a battery assembly for providing a direct current power supply;

[0016] a high-voltage charging assembly connected to the battery assembly for boosting the low-voltage direct current power provided by the battery assembly and storing energy;

[0017] a high-voltage pulse generator assembly connected to the high-voltage charging assembly for quickly releasing the energy stored in the high-voltage charging assembly as the high-voltage pulse signal under a trigger instruction;

[0018] a control circuit assembly connected to the high-voltage charging assembly, the high-voltage pulse generator assembly and the battery assembly respectively for controlling the high-voltage charging assembly to start the boosting process and triggering the high-voltage pulse generator to discharge; the control circuit assembly triggers the high-voltage pulse generator assembly to release energy according to the pulse parameters transmitted by the control software, so that the X-ray tube generates corresponding pulsed X-rays in each discharge.

[0019] Preferably, the anode rod at the output end of the pulsed X-ray machine is made of tungsten, the diameter of the anode rod is 3mm and the taper angle is 35°-45°; the size of the cathode at the output end of the pulsed X-ray machine is 14mm and the size of the focal spot is 2.67mm; the overall size of the pulsed X-ray machine is not more than 450mm and the weight is not more than 15kg, the maximum output voltage is 313kV and the radiation dose at a distance of 30.5cm is not more than 8mR.

[0020] Preferably, the flat panel detector comprises:

[0021] a scintillator layer for converting the received pulsed X-rays into visible light photons;

[0022] an amorphous silicon pixel array layer arranged below the scintillator layer and composed of a plurality of pixel units each consisting of a photodiode and a thin film transistor; wherein the photodiode is used to convert the visible light photons into charge signals and temporarily store them in a junction capacitor; the thin film transistor is used to control the row-by-row output of each pixel charge signal;

[0023] A readout circuit layer is arranged below the amorphous silicon pixel array layer and connected with the thin film transistor; the readout circuit layer comprises an amplifier and an analog-to-digital converter; the readout circuit layer is used for receiving the pixel charge signal and performing amplification processing to convert an analog signal into the digital image data for output.

[0024] Preferably, the pixel size of the flat panel detector is 85 μm, the effective imaging area is 240 mm x 300 mm; the bit number of the analog-to-digital converter is 16 bit, and the X-ray response energy range is 20-300 keV; the weight of the flat panel detector is not more than 2.5 kg.

[0025] Preferably, the working steps of the X-ray machine control management module comprise:

[0026] communication with the pulse X-ray machine according to the set communication parameters and detecting the serial port connection state;

[0027] setting pulse parameters in sequence according to the initial configuration; the pulse parameters comprise pulse width, delay time and frequency;

[0028] after initialization, starting a timer to obtain the X-ray machine data;

[0029] extracting battery voltage, air pressure, temperature and pulse parameters based on the X-ray machine data and performing parameter configuration management;

[0030] setting the number of pulses;

[0031] in the case that the battery voltage, air pressure, temperature and pulse parameters are normal and the parameter setting is successful, sending the control instruction of starting or closing to control the working state of the pulse X-ray machine.

[0032] Preferably, the working steps of the image acquisition module comprise:

[0033] initializing the flat panel detector and establishing connection;

[0034] after initialization, obtaining the working mode, temperature, humidity and battery capacity information of the flat panel detector;

[0035] setting the integration time and calibration mode;

[0036] after parameter setting, performing image acquisition;

[0037] before image acquisition, switching the calibration mode to the raw data acquisition mode;

[0038] respectively acquiring dark field images and bright field images to obtain acquisition results;

[0039] Generate offset template and gain and bad pixel template based on the acquisition results, in the image acquisition process, call the offset template and gain and bad pixel template to correct the collected data;

[0040] Amplify and analog-to-digital convert the electrical signal received by the flat panel detector, and output the corresponding digital image data.

[0041] Preferably, the working steps of the image processing and evaluation module include:

[0042] Receive the digital image data output by the image acquisition module;

[0043] Adjust the window width and window level of the selected region of the digital image data;

[0044] Perform global inverse processing on the adjusted image;

[0045] Perform multi-scale contrast enhancement processing on the inverse image;

[0046] Calculate the signal-to-noise ratio of the selected region of the enhanced image;

[0047] Select an image region containing a structural feature pattern in the enhanced image, and extract the straight line structure and double wire structure in the image region;

[0048] Calculate the basic spatial resolution of the image based on the straight line structure and double wire structure;

[0049] Output the enhanced image and the corresponding signal-to-noise ratio and basic spatial resolution.

[0050] Preferably, the control software calls three types of dynamic link libraries respectively; the three types of dynamic link libraries are: a link library for pulse X-ray machine control, a link library for image acquisition, and a link library for image processing and evaluation.

[0051] A detection method applied to the above-mentioned industrial low-radiation digital imaging detection system, comprising:

[0052] Send control instructions to the pulse X-ray machine through the X-ray machine control module to control the pulse X-ray machine to emit pulse X-rays;

[0053] Initialize the flat panel detector and establish communication through the image acquisition module;

[0054] Control the flat panel detector and the pulse X-ray machine to synchronize, collect electrical signals corresponding to the pulse X-rays, and convert the electrical signals into digital image data;

[0055] The digital image data is subjected to image enhancement processing by the image processing and evaluation module, to obtain an enhanced image, and the enhanced image is subjected to spatial resolution evaluation.

[0056] According to the specific embodiments of the present application, the following technical effects are disclosed.

[0057] The industrial low-radiation ray digital imaging detection system designed by the present application comprises a pulse X-ray machine, a flat panel detector and control software, all components are domestic, and has the characteristics of high energy and miniaturization. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0059] Figure 1 The system structure schematic diagram provided for the embodiments of the present application is provided.

[0060] Figure 2 The pulse X-ray machine structure schematic diagram provided for the embodiments of the present application is provided.

[0061] Figure 3 The flat panel detector structure schematic diagram provided for the embodiments of the present application is provided.

[0062] Figure 4 The relationship between the main program and dynamic link library of the ray digital imaging detection system control software provided for the embodiments of the present application is shown in the schematic diagram. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0064] The purpose of the present application is to provide an industrial low-radiation ray digital imaging detection system and a detection method thereof, by designing a pulse X-ray machine, a flat panel detector and control software, to form an industrial low-radiation ray digital imaging detection system.

[0065] In order to make the above objectives, characteristics and advantages of the present application more apparent, comprehensible and easier to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0066] Figure 1 The system structure schematic diagram provided by the embodiment of the present application is shown in Figure 1 The present application provides an industrial low radiation ray digital imaging detection system, comprising:

[0067] a pulse X-ray machine, configured to emit pulse X-rays with preset pulse width, frequency and quantity according to control instructions;

[0068] a flat panel detector, configured to receive the pulse X-rays and convert them into corresponding electrical signals, and then generate digital image data through a readout circuit;

[0069] control software, configured with a ray machine control module, an image acquisition module and an image processing and evaluation module; the ray machine control module is configured to send emission control instructions to the pulse X-ray machine; the image acquisition module is configured to control the flat panel detector to acquire the digital image data corresponding to the pulse X-rays according to preset parameters; and the image processing and evaluation module is configured to perform noise reduction, enhancement, signal-to-noise ratio and spatial resolution evaluation on the acquired digital image data.

[0070] a communication interface, configured to realize signal interaction between the control software and the pulse X-ray machine and the flat panel detector.

[0071] The technical solution adopted by the embodiment is that the pulse X-ray machine, the flat panel detector and the control software are designed to form an industrial low radiation ray digital imaging detection system. Firstly, the pulse X-ray machine is designed to form a miniaturized, lightweight high-energy pulse X-ray machine; secondly, the flat panel detector is designed to form a low-dose amorphous silicon flat panel detector; thirdly, the ray digital imaging detection system control software is designed to form a high-performance ray digital imaging detection system control software; and finally, the above components are integrated to form an industrial low radiation ray digital imaging detection system. The design method adopts the following steps:

[0072] S1. Pulse X-ray machine design

[0073] As Figure 2As shown, the pulsed X-ray machine includes an X-ray tube, power supply assembly, control circuit assembly, high-voltage charging assembly, and high-voltage pulse generator assembly. Powered by a battery assembly, the high-voltage charging assembly, driven by the control circuit, boosts the battery output voltage to generate a high DC voltage that charges the high-voltage pulse generator to a preset voltage. Then, it controls the generation of a trigger pulse to activate a switch, discharging and generating a high-voltage pulse to drive the X-ray tube to output pulsed X-rays. By using a compact high-voltage pulse generator and optimizing the connection methods of each component, the pulsed X-ray machine is miniaturized and lightweight. Through the design of parameters such as the X-ray anode material (tungsten), diameter (3mm), cone angle (35°-45°), and cathode size (14mm), the pulsed X-ray machine achieves high energy and a small focal spot, suitable for industrial applications. The overall size of the pulsed X-ray machine is designed to not exceed 450mm, the weight to be less than or equal to 15kg, the maximum output voltage to be 313kV, the radiation dose at a distance of 30.5cm from the radiation source to be 8mR, the maximum repetition rate to be 19.6Hz, and the focal spot size to be 2.67mm.

[0074] S2. Flat Panel Detector Design

[0075] like Figure 3 As shown, an amorphous silicon flat panel detector structure is designed using a scintillator + a-Si + TFT + readout circuit configuration. The top layer is the scintillator layer, which converts incident radiation into visible light photons, creating a gain of 1000 to 10000 times. The next layer is an amorphous silicon pixel array. Each pixel is represented in circuitry by a photodiode and a thin-film transistor connected in series. The photodiode converts fluorescence into charge, which is stored in its capacitance. Each pixel has a thin-film transistor connected to the photodiode in the amorphous silicon array, acting as a switch. The bottom layer is the readout circuit, including integrated circuit chips such as amplifiers and ADCs. The readout circuit reads the stored charge sequentially line by line, processes, amplifies, and performs A / D conversion to form a digital image signal. This achieves the domestic production of low-dose amorphous silicon flat panel detectors. The designed flat panel detector has a pixel size of 85μm, a theoretical limit resolution of ≥5lp / mm, an effective detector area of ​​240×300mm, an A / D conversion bit depth of 16bit, an X-ray energy range of 20-300keV, and a weight of 2.5kg.

[0076] S3. Design of Control Software for Digital Imaging Detection System

[0077] The control software for the X-ray digital imaging inspection system includes a main program, a X-ray machine control and management module, an image acquisition module, and an image processing and evaluation module. The main program primarily implements functions such as menus, function modules, image display, and a software management layer.

[0078] The ray machine control management module communicates with the pulse X-ray machine through a dynamic link library (XrayC.dll), and mainly includes functions such as serial port connection management, ray machine initialization, state monitoring, control instruction issuing, etc. The module calls the XrayC::connectRay() function according to the set communication parameters to establish communication with the ray machine and detect the serial port connection state, sets the pulse parameters (pulse width, delay, frequency of pulse 1 and pulse 2) in turn according to the initial configuration, after initialization, starts the timer to continuously call the XrayC::getRayValues() function to obtain the ray machine data, parses the parameter list returned by Modbus, extracts the battery voltage, air pressure, temperature, pulse parameters and other data, the parameters are managed through the AppConfig global configuration, the XrayC::setImpulseValue() function is called to set the pulse number, and after the ray machine state is normal and the parameter setting is successful, the XrayC::openRay() function or the XrayC::closeRay() function is called to send the start or close instruction.

[0079] The image acquisition module communicates with the flat panel detector through a dynamic link library (DetectionC.dll), and mainly includes functions such as detector initialization, image acquisition, calibration, state monitoring, parameter configuration, etc. The module calls DEC_Init() to initialize the flat panel detector and establish a connection, reads the detector mode, temperature, humidity, battery power and other data through the event callback function after initialization, calls the DEC_SetCalibMode() function and the DEC_SetXwin() function to set the integration time and calibration mode respectively, and calls DEC_GetImage() for image acquisition after the parameter setting is successful. The calibration function is used to generate a correction template, which is performed before setting the calibration mode, switches the calibration mode to RAW mode, acquires the required dark and bright field images, and calls the DEC_GenOffsetTpl(), DEC_GenGainTpl() and other functions to generate offset, gain / bad point templates respectively.

[0080] The image processing and evaluation module realizes image processing and measurement related functions through a dynamic link library (DDImgProc.dll), and mainly includes functions such as DR image window width and window level adjustment, inversion, multi-scale contrast enhancement, signal-to-noise ratio measurement, spatial resolution measurement, etc. The window width and window level adjustment is realized by inputting the selected area into the called WindowLevelTransform() function, the image is globally inverted by calling the Invert() function, the IPFuncMUSICA() function is called to perform multi-scale contrast enhancement processing on the image, the GetSNR() function is called to calculate the signal-to-noise ratio of the selected area, and the ComputeBSR() function is called to calculate the basic spatial resolution according to the input straight line segment and double wire image.

[0081] The software realizes the complete ray digital imaging detection process by the cooperation of three dynamic link libraries. The ray machine control and management dynamic link library realizes the initialization and parameter adjustment (pulse width, frequency, pulse number, etc.) of the pulse ray machine through the Modbus TCP protocol, and realizes the state monitoring of the ray machine in a polling mode. The image acquisition dynamic link library realizes the initialization, correction, parameter setting, etc. of the detector through wired or wireless connection based on multi-protocol adaptation technology. The image processing and evaluation dynamic link library develops image processing and measurement algorithms based on OpenCV bottom layer. The multi-scale image enhancement is based on the image enhancement algorithm of multi-scale decomposition and reconstruction. The image is decomposed into different scales to extract detailed information and perform nonlinear mapping, and finally the image is reconstructed to enhance the contrast. The power law transformation is applied to the detailed information of each scale g is the mapped gray value, d is the original gray value, m is the maximum gray value, and γ is the adjustment parameter; the Laplace transform uses the Laplace operator to detect the edges in the image, and highlights the high-frequency information (such as edges and details) by calculating the second derivative of the image, to achieve the sharpening effect; the image spatial resolution extracts the gray curve along the straight line direction, calculates the average gray value of 21 groups of pixels, uses the least square method to fit the gray curve, obtains the ridge line equation, and calculates the modulation degree d A , d B is the distance from the left and right minimum points to the ridge line, d C is the distance from the maximum point to the ridge line, and the modulation degree is calculated by the interpolation method as 20%; the signal-to-noise ratio (SNR) is the ratio of the signal intensity to the noise intensity in the image μ is the average gray value in the measurement area, and σ is the standard deviation of the pixel gray value in the measurement area. The data interaction is realized by interface calling of each dynamic link library, the synchronization of detector image acquisition and ray pulse is ensured by relying on the software trigger chain, and the flexible replacement and independent upgrade of the detector / ray machine equipment are supported by modular design, which improves the maintainability and scalability of the system, adapts to the updating needs of different equipment, and realizes the localization of the control software of the ray digital imaging detection system.

[0082] S4. Ray digital imaging detection system construction

[0083] As Figure 4As shown, the pulse X-ray machine and the flat panel detector synchronization control mechanism are established, the pulse number and the X-ray machine working frequency required by a single image are set by the control software, the detector integration time is calculated and set. The image acquisition program is triggered, after receiving the Ready signal feedback by the detector, the pulse X-ray machine starts to emit X-ray pulses at the set frequency. The integration window of the detector strictly covers the whole pulse emission period, and the multi-pulse energy is accumulated in the single integration time to generate the original image data. Through the design of the communication protocol between the pulse X-ray machine, the flat panel detector and the control software, a domestic X-ray digital imaging detection system is formed. Through the control software setting X-ray pulse number, single image acquisition time, image number, the pulse X-ray machine receives the instruction emitted by the control software to emit X-ray, and the flat panel detector is controlled by the control software to start image acquisition work synchronously until the preset image number is acquired, and the collected all images are superimposed and output by the software.

[0084] The present application forms an industrial low-radiation X-ray digital imaging detection system by designing the pulse X-ray machine, the flat panel detector and the control software.

[0085] Corresponding to the above method, the embodiment also provides a detection method applied to the above industrial low-radiation X-ray digital imaging detection system, comprising:

[0086] The X-ray machine control module sends a control instruction to the pulse X-ray machine to control the pulse X-ray machine to emit pulse X-rays;

[0087] The image acquisition module initializes the flat panel detector and establishes communication;

[0088] The flat panel detector and the pulse X-ray machine are controlled synchronously, the electrical signal corresponding to the pulse X-ray is acquired, and the electrical signal is converted into digital image data;

[0089] The image processing and evaluation module performs image enhancement processing on the digital image data to obtain an enhanced image, and performs spatial resolution evaluation on the enhanced image.

[0090] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other.

[0091] The principles and implementation modes of the present application are described by applying specific examples herein, and the above embodiment description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An industrial low-radiation digital imaging inspection system, characterized in that, The application relates to a pulse X-ray machine, a flat panel detector and a control software. The pulse X-ray machine is used for emitting pulse X-rays with preset pulse width, frequency and quantity according to control instructions. The flat panel detector is used for receiving the pulse X-rays and converting the pulse X-rays into corresponding electric signals, and then generating digital image data through a readout circuit. The control software is configured with a ray machine control module, an image acquisition module and an image processing and evaluation module. The ray machine control module is used for sending emission control instructions to the pulse X-ray machine.

2. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The image acquisition module is used for controlling the flat panel detector to acquire the digital image data corresponding to the pulse X-rays according to preset parameters. The image processing and evaluation module is used for performing noise reduction, enhancement, signal-to-noise ratio and spatial resolution evaluation on the acquired digital image data.

3. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The communication interface is used for realizing signal interaction between the control software and the pulse X-ray machine and the flat panel detector. The control software is further configured with a synchronous control mechanism. After the flat panel detector sends a "ready" signal, the control software triggers the pulse X-ray machine to emit the pulse X-rays at a set frequency. The flat panel detector completes image integration acquisition in each pulse emission period and transmits all the digital image data to the control software for processing and output. The pulse X-ray machine comprises an X-ray tube, a battery assembly, a high-voltage charging assembly, a high-voltage pulse generator assembly and a control circuit assembly. The X-ray tube is used for emitting the pulse X-rays when receiving a high-voltage pulse signal.

4. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The battery assembly is used for providing a direct-current power supply. The high-voltage charging assembly is connected with the battery assembly and is used for boosting low-voltage direct-current power supplied by the battery assembly and storing energy. The high-voltage pulse generator assembly is connected with the high-voltage charging assembly and is used for rapidly releasing the energy stored in the high-voltage charging assembly into the high-voltage pulse signal under a trigger instruction. The control circuit assembly is connected with the high-voltage charging assembly, the high-voltage pulse generator assembly and the battery assembly respectively and is used for controlling the high-voltage charging assembly to start a boosting process and triggering the high-voltage pulse generator to discharge. The control circuit assembly triggers the high-voltage pulse generator assembly to release energy according to pulse parameters transmitted by the control software, so that the X-ray tube generates corresponding pulse X-rays in each discharge. The anode rod at the output end of the pulse X-ray machine is made of tungsten, the diameter of the anode rod is 3 mm, and the taper angle is 35-45 degrees. The size of the cathode at the output end of the pulse X-ray machine is 14 mm, and the size of the focal spot is 2.67 mm. The overall size of the pulse X-ray machine is not more than 450 mm, the weight is not more than 15 kg, the maximum output voltage is 313 kV, and the radiation dose at a distance of 30.5 cm is not more than 8 mR. The flat panel detector comprises a scintillator layer and an amorphous silicon pixel array layer. The amorphous silicon pixel array layer is arranged below the scintillator layer and is composed of a plurality of pixel units corresponding to photodiodes and thin film transistors. The photodiode is used for converting the visible light photons into charge signals and temporarily storing the charge signals in junction capacitors. The thin film transistor is used for controlling the row-by-row output of the pixel charge signals. A readout circuit layer is arranged below the amorphous silicon pixel array layer and connected with the thin film transistor; the readout circuit layer comprises an amplifier and an analog-digital converter; the readout circuit layer is used for receiving the pixel charge signal and performing amplification processing to convert an analog signal into the digital image data for output.

5. The industrial low-radiation digital imaging inspection system of claim 4, wherein, The pixel size of the flat panel detector is 85 μm, the effective imaging area is 240 mm x 300 mm; the bit number of the analog-digital converter is 16 bit, and the X-ray response energy range is 20-300 keV; the weight of the flat panel detector is not more than 2.5 kg.

6. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The working steps of the X-ray machine control management module include: establishing communication with the pulse X-ray machine according to the set communication parameters and detecting the serial port connection state; setting pulse parameters in sequence according to the initial configuration; the pulse parameters include pulse width, delay and frequency; after initialization, starting a timer to obtain the X-ray machine data; extracting battery voltage, air pressure, temperature and pulse parameters based on the X-ray machine data and performing parameter configuration management; setting the number of pulses; in the case that the battery voltage, air pressure, temperature and pulse parameters are normal and the parameter setting is successful, sending the control instruction of starting or closing to control the working state of the pulse X-ray machine.

7. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The working steps of the image acquisition module include: initializing the flat panel detector and establishing connection; after initialization, obtaining the working mode, temperature, humidity and battery capacity information of the flat panel detector; setting integration time and calibration mode; after parameter setting, performing image acquisition; before image acquisition, switching the calibration mode to the original data acquisition mode; respectively acquiring dark field images and bright field images to obtain acquisition results; generating offset templates and gain and bad point templates based on the acquisition results, and calling the offset templates and gain and bad point templates to correct the acquired data in the image acquisition process; amplifying and analog-digital converting the electrical signal received by the flat panel detector to output corresponding digital image data.

8. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The working steps of the image processing and evaluation module include: receiving the digital image data output by the image acquisition module; performing window width and window level adjustment on the selected region of the digital image data; performing global inverse processing on the adjusted image; performing multi-scale contrast enhancement processing on the inverse image; calculating the signal-to-noise ratio of the selected region of the enhanced image; selecting an image region containing a structure feature pattern in the enhanced image and extracting straight line structures and double wire structures in the image region; calculating the basic spatial resolution of the image based on the straight line structures and double wire structures; outputting the enhanced image and corresponding signal-to-noise ratio and basic spatial resolution.

9. The industrial low-radiation digital imaging inspection system of claim 1, wherein, The control software respectively calls three types of dynamic link libraries; the three types of dynamic link libraries are respectively: a link library for pulse X-ray machine control, a link library for image acquisition and a link library for image processing and evaluation.

10. A method of inspection applied to the industrial low-radiation digital imaging inspection system of any one of claims 1 to 9, characterized in that, It includes: sending a control instruction to the pulse X-ray machine through the X-ray machine control module to control the pulse X-ray machine to emit pulse X-rays; initializing the flat panel detector through an image acquisition module and establishing communication; controlling the flat panel detector to synchronize with the pulsed X-ray machine, acquiring an electric signal corresponding to the pulsed X-ray, and converting the electric signal into digital image data; performing image enhancement processing on the digital image data through the image processing and evaluation module to obtain an enhanced image, and performing spatial resolution evaluation on the enhanced image.

Images