CN-122015723-A - Online nondestructive testing system, method and equipment for thickness of each layer of coated particles

CN122015723ACN 122015723 ACN122015723 ACN 122015723ACN-122015723-A

Abstract

The application relates to the technical field of nuclear engineering, in particular to an online nondestructive testing system, method and equipment for coating the thickness of each layer of particles, wherein the system comprises the following components: the device comprises a sample table, an X-ray tube assembly, an imaging assembly, a loading and unloading unit, a controller and a processor, wherein the processor is configured to execute the steps of sending a shooting instruction of a first lens of the imaging assembly to the controller, controlling the sample table to move and acquire an image shot by the first lens by the controller, identifying the center position of the image, sending a shooting instruction of a second lens of the imaging assembly to the controller, controlling the sample table to move by the controller, enabling the second lens to shoot and acquire the image by taking the center position as a starting point, identifying the contour of a coating layer of each coating particle one by one, repeating the steps until each module is shot, and finally determining the thickness of the coating layer according to the distance between the contours of each coating layer. Therefore, the problem that the detection efficiency is not considered in the related technology, and the online detection of a large number of coated particles in a nuclear fuel element production line is difficult to realize is solved.

Inventors

WANG YUE
ZHANG KAIHONG
ZHAO HONGSHENG
LI ZIQIANG
YANG HUI
LIU XIAOXUE
CHENG XING
LIU BING

Assignees

清华大学

Dates

Publication Date: 20260512
Application Date: 20251219

Claims (10)

1. An on-line non-destructive inspection system for coating particle thickness, comprising: Placing a sample stage of the coated particle array arrangement device; the imaging assembly is used for shooting and collecting images of the coated particle array arrangement device, wherein the imaging assembly comprises an objective lens assembly and a collecting assembly, the objective lens assembly comprises a first lens and a second lens, and the imaging visual field range of the first lens is larger than that of the second lens; the X-ray tube assembly is used for emitting X-rays to penetrate through the particle array arrangement device, and the imaging assembly is used for collecting the X-rays penetrating through the particle array arrangement device; The loading and unloading unit is used for placing or removing the coated particles into or from the sample table and comprises a manipulator and an access bin; a controller for controlling movement of the sample stage and the imaging assembly; a processor configured to perform the steps of: Transmitting a first position instruction and a first lens shooting instruction to the controller, wherein the controller moves the sample stage to a first target position according to the first position instruction, and acquires an image shot by the first lens according to the first lens shooting instruction; The controller controls the sample stage to move according to a first preset moving track according to the second position instruction, so that the second lens starts from the initial position, scans coated particles according to a target scanning track and acquires an image shot by the second lens according to the second lens shooting instruction; After the second lens finishes shooting all the coated particles in the module, sending a next position instruction and the first lens shooting instruction to the controller according to a second preset moving track, wherein the controller moves the sample stage to a next target position according to the next position instruction, and repeats the steps at the next target position to obtain an image shot by the second lens until the second lens finishes shooting all the coated particles in the coated particle array arrangement device; and identifying the outlines of all coating layers of the coating particles in the image shot by the second lens, and determining the thickness of the coating layers according to the distance between the outlines of all coating layers.
2. The on-line nondestructive testing system for the thickness of each layer of coated particles of claim 1, wherein the processor is pre-configured with an image recognition algorithm, and the image recognition algorithm is used to recognize the center position of the module on the particle array arrangement device in the image captured by the first lens, and to recognize the contour of each coated layer of coated particles in the image captured by the second lens.
3. The on-line non-destructive inspection system for coating particle thicknesses according to claim 1, wherein the processor is preconfigured with a first movement trace and a second movement trace of the sample platform, wherein the preconfigured first movement trace is: Taking the central position of a module as a starting point, moving the module layer by layer from inside to outside by taking the coated particles as units according to tracks, wherein all the coated particles in the module are presented in the visual field range of the second lens one by taking the coated particles as units in the moving process of the sample stage; the preconfigured second moving track is as follows: And taking a module at the central position of the coated particle array arrangement device as a starting point, moving from inside to outside layer by taking the module as a unit, and displaying all coated particles of the coated particle array arrangement device in the visual field range of the first lens one by taking the module as a unit in the moving process of the sample stage.
4. The on-line non-destructive inspection system for coating particle thicknesses of claim 1, further comprising: The first base and the second base are arranged vertically, and the first base is arranged parallel to the horizontal plane; The imaging assembly is arranged on the first motion platform, the first motion platform allows the imaging assembly to move in the vertical direction along the second base, and the first motion platform drives the imaging assembly to move in the vertical direction along the second base; The sample stage and the X-ray tube assembly are arranged on the second base, the controller is arranged on the first base, and the controller controls the sample stage and the X-ray tube assembly to move.
5. The system of claim 4, wherein the controller controls the three-dimensional movement of the sample stage, the sample stage comprises a second moving platform and a third moving platform, the third moving platform is vertically connected with the second moving platform, the third moving platform is arranged on the second base and allows the second base to move in a vertical direction, the third moving platform drives the second moving platform to move in a vertical direction along the second base, the second moving platform allows the second base to move in a horizontal direction perpendicular to the second base, the second moving platform is provided with a coated particle array arrangement device, the X-ray component is arranged on the third moving platform, and the controller controls the third moving platform to move in a vertical direction along the second base and drives the X-ray tube component to move in a vertical direction along the second base.
6. The on-line nondestructive testing system for the thickness of each layer of coated particles of claim 1 or 4, wherein the manipulator is disposed on a second base, the manipulator is connected with the controller, the in-out bin comprises an in-out bin and an out-out bin, and the controller controls the manipulator to suck coated particles from the in-out bin and put the coated particles into the small holes of the coated particle array arrangement device, and suck the coated particles from the coated particle array arrangement device one by one and put the coated particles into the out-out bin.
7. An on-line non-destructive testing method for coating particle thickness, characterized in that the method is applied to the on-line non-destructive testing system for coating particle thickness according to any one of claims 1-6, wherein the method comprises: Transmitting a first position instruction and a first lens shooting instruction to the controller, wherein the controller moves the sample stage to a first target position according to the first position instruction, and acquires an image shot by the first lens according to the first lens shooting instruction; The controller controls the sample stage to move according to a first preset moving track according to the second position instruction, so that the second lens starts from the initial position, scans coated particles according to a target scanning track and acquires an image shot by the second lens according to the second lens shooting instruction; After the second lens finishes shooting all the coated particles in the module, sending a next position instruction and the first lens shooting instruction to the controller according to a second preset moving track, wherein the controller moves the sample stage to a next target position according to the next position instruction, and repeats the steps at the next target position to obtain an image shot by the second lens until the second lens finishes shooting all the coated particles in the coated particle array arrangement device; And identifying the outlines of all coating layers of the coating particles in the image shot by the second lens, and determining the thickness of the coating layers according to the distance between the outlines of all coating layers.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the on-line non-destructive testing method of claim 7 for coating particle thickness.
9. A computer readable storage medium having stored thereon a computer program or instructions which, when executed, implements the on-line non-destructive testing method for coating particle thickness according to claim 7.
10. A computer program product comprising a computer program which, when executed by a processor, implements the on-line non-destructive testing method for coating particle layer thicknesses according to claim 7.

Description

Online nondestructive testing system, method and equipment for thickness of each layer of coated particles Technical Field The application relates to the technical field of nuclear engineering, in particular to an online nondestructive testing system, method and equipment for thickness of each layer of coated particles. Background The core of the high temperature gas cooled reactor fuel element is TRISO (Tri-structural Isotropic, three structure isotropy) coated fuel particles. The particles are based on a UO 2 (uranium dioxide) core with a diameter of about 0.5 mm, and are sequentially coated with loose pyrolytic carbon, inner dense pyrolytic carbon, siC (silicon carbide) and outer dense pyrolytic carbon layers to form a multilayer structure. These cladding layers serve the key functions of buffering stress, blocking fission product release, providing mechanical strength, etc. during reactor operation, and constitute a first barrier for reactor safety. Thus, accurate measurement of the thickness of each layer is critical to ensuring the safety and reliability of the fuel element. The traditional detection method mainly adopts a metallographic microscope method. The method is characterized in that fuel particles are inlaid in resin, and imaging analysis is carried out after the fuel particles are polished to be close to the equatorial plane of the particles, so that thickness information of each coating layer is obtained. However, since TRISO particles are small in size and have individual differences, it is difficult to ensure that all particles are accurately polished to the desired position in practical operation. In addition, the method is destructive, the sample cannot be reused, and a certain amount of radioactive waste is generated, so that the application of the method in large-scale detection is limited. Disclosure of Invention The application provides an online nondestructive testing system, method and equipment for thickness of each layer of coated particles, which are used for solving the problems that the related technology does not consider the testing efficiency and is difficult to realize online testing of a large number of coated particles in a nuclear fuel element production line. An embodiment of a first aspect of the present application provides an online nondestructive testing system for coating particle thickness of each layer, comprising a sample stage for placing a coated particle array arrangement device; the imaging assembly is used for shooting and collecting images of the coated particle array arrangement device, the imaging assembly comprises an objective lens assembly and a collecting assembly, the objective lens assembly comprises a first lens and a second lens, and the imaging visual field range of the first lens is larger than that of the second lens; the X-ray tube assembly is used for emitting X-rays to penetrate the particle array arrangement device, the imaging assembly is used for collecting the X-rays penetrating the particle array arrangement device, the loading and unloading unit is used for placing coated particles into or removing coated particles from the sample platform, the loading and unloading unit comprises a manipulator and an access bin, the controller is used for controlling the sample platform and the imaging assembly to move, the processor is configured to execute the following steps of sending a first position command and a first lens shooting command to the controller, the controller moves the sample platform to a first target position according to the first position command, obtains an image shot by the first lens according to the first lens shooting command, takes an image range shot by the first lens as a module, identifies the central position of the module, takes the central position as the initial position of a second lens, sends a second position command and the second lens shooting command to the controller, controls the sample platform to move according to a first pre-configured moving track according to the second position command, enables the second lens to start scanning coated particles according to a target scanning track, obtains an image shot by the second lens according to the second lens shooting command, after all coated particles are shot in the second finishing module, the method comprises the steps of sending a next position instruction and a first lens shooting instruction to a controller, moving a sample stage to a next target position by the controller according to the next position instruction, repeating the steps at the next target position, obtaining an image shot by a second lens until the second lens finishes shooting all coating particles in a coating particle array arrangement device, identifying the outlines of all coating layers of the coating particles in the image shot by the second lens, and determining the thickness of the coating layers according to the distance between the outlines of the coating layers. Optional