CN-121994823-A - Three-dimensional imaging detection integrated device and method for carbon deuterium target pill

CN121994823ACN 121994823 ACN121994823 ACN 121994823ACN-121994823-A

Abstract

The invention discloses a three-dimensional imaging detection integrated device and method for a carbon deuterium target pill, and belongs to the technical field of optical precision measurement and nondestructive detection. The device comprises an illumination mechanism, an imaging mechanism, a sample control mechanism and a control mechanism, wherein the illumination mechanism adopts an addressable LED array to provide multi-angle illumination, the imaging mechanism is a 4f microscopic system and is used for collecting images, the sample control mechanism is used for realizing automatic posture adjustment and transmission of target pills, and the control mechanism is used for coordinating all modules to complete automatic detection. The method comprises the steps of collecting an image sequence, recovering complex amplitude projection by utilizing a Fourier stack imaging algorithm, and automatically identifying a marking defect by comparing a calculated surface point cloud radius with a standard value based on a tomographic inversion algorithm. The invention realizes the automatic, quantitative and high-resolution three-dimensional imaging and evaluation of the morphology and internal defects of the target pill, and provides a stable and efficient measuring platform for scientific research and industrial application.

Inventors

Shi Daishi
QI YUNLONG
Jia Tianlei
ZHANG TIANHAO

Assignees

中国科学院大学

Dates

Publication Date: 20260508
Application Date: 20260127

Claims (10)

1. A three-dimensional imaging detection integrated device for a carbon deuterium target pill, comprising: An illumination mechanism comprising an addressable LED array light source and a drive circuit therefor; The imaging mechanism is in optical path connection with the illumination mechanism and comprises a micro optical system and a camera, and the micro optical system is arranged by an objective lens and a simple lens according to a 4f optical path structure; a sample manipulation mechanism comprising: The adsorption rotating unit is formed by mechanically connecting a rotating motor and a transparent suction nozzle and is used for fixing and rotating the target pill; The displacement positioning unit is formed by mechanically connecting a three-dimensional displacement table and a rotary table and is used for controlling the spatial position of the adsorption rotary unit; the object carrying unit is arranged in a layered manner and internally provided with a track for storing the target pills to be detected and detected; The control mechanism is respectively and electrically connected with the illumination mechanism, the imaging mechanism and the sample control mechanism, and comprises a main controller and a slave controller communicated with the main controller, wherein the output end of the slave controller is respectively connected with the driving circuit of the LED array light source and the rotating motor, and the main controller is also respectively and communicatively connected with the displacement table controller and the camera.
2. The integrated device for three-dimensional imaging detection of deuterium carbon target pellets according to claim 1, characterized in that in said adsorption rotating unit, the central axis of said transparent suction nozzle is arranged coaxially with the rotation axis of said rotating motor.
3. The integrated device for three-dimensional imaging detection of deuterium carbon target pellets according to claim 1, wherein said carrying unit comprises a to-be-detected bin and a detected bin arranged in layers, and a track is arranged inside the to-be-detected bin and the detected bin for guiding the target pellets to move between the to-be-detected bin and the detected bin.
4. The integrated device for three-dimensional imaging and detection of deuterium-carbon target pellets according to claim 1, wherein in the 4f optical path structure, the distance from the sample to the front focal plane of the objective lens is the focal length of the objective lens, the distance from the back focal plane of the objective lens to the front focal plane of the simple lens is the sum of the focal lengths of the objective lens and the simple lens, and the distance from the back focal plane of the simple lens to the target plane of the camera is the focal length of the simple lens.
5. The integrated device for three-dimensional imaging and detection of deuterium-carbon target pellets according to claim 1, wherein the slave controller comprises a microcontroller, and the microcontroller is an Arduino single-chip microcomputer.
6. A three-dimensional imaging detection method for a carbon deuterium target pill, which is characterized in that the method adopts the three-dimensional imaging detection integrated device for the carbon deuterium target pill according to any one of claims 1-5, and comprises the following steps: the image acquisition step comprises the steps of cooperatively controlling the illumination mechanism, the imaging mechanism and the sample control mechanism through the control mechanism to acquire two-dimensional image sequences of the target pill under different illumination angles and different rotation angles; A three-dimensional morphology reconstruction step, namely processing the two-dimensional image sequence to reconstruct three-dimensional morphology and internal structure information of the target pill; And a defect analysis step, namely extracting surface profile characteristics of the target pill based on the reconstruction result, and identifying and marking defects by comparing the surface profile characteristics with a standard radius.
7. The method of claim 6, wherein the step of capturing images includes controlling the LED array light sources to illuminate in a predetermined sequence to provide different angles of illumination, and synchronously controlling the rotating motor to step the rotating target, and capturing a low-resolution intensity image by the camera at each illumination-rotation angle combination.
8. The method for three-dimensional imaging detection of a carbon deuterium target pill according to claim 6, characterized in that said three-dimensional topography reconstruction step comprises: Applying a Fourier stacked imaging algorithm to the image sequences acquired under each rotation angle to recover the two-dimensional complex amplitude projection of the target pill under the angle; Taking two-dimensional complex amplitude projections under different rotation angles as input, and calculating to obtain the three-dimensional refractive index distribution of the target pill through a chromatographic reconstruction algorithm to obtain three-dimensional morphology and structure information.
9. The method for detecting the three-dimensional imaging of the carbon deuterium target pill according to claim 8, wherein the defect analysis step comprises the steps of calculating Euclidean distance from each point on the surface profile of the three-dimensional morphology to a fitting circle center as an actual radius, comparing the actual radius with the standard radius, and marking the point as a defect point if the deviation exceeds a preset threshold.
10. The method for three-dimensional imaging detection of deuterium carbon target pellets according to claim 9, characterized in that said preset threshold is 1.11%.

Description

Three-dimensional imaging detection integrated device and method for carbon deuterium target pill Technical Field The invention relates to the technical field of optical precision measurement and nondestructive detection, in particular to a three-dimensional imaging detection integrated device and method for a carbon deuterium target pill. Background In inertial confinement nuclear fusion (ICF) research, the target pellets are used as carriers of fusion fuel, and strict control of geometric accuracy, shell uniformity and internal defects is a precondition for realizing symmetrical implosion and successful ignition. Any micron-sized topographical defects or structural irregularities may be dramatically amplified by the rayleigh-taylor instability, leading to experimental failure. Therefore, development of technology and equipment capable of realizing high-precision, nondestructive and quantitative three-dimensional imaging detection on the target pill becomes a key link in ICF research. Currently, there are significant limitations to detection schemes for such transparent three-dimensional microsphere samples. Although X-ray Computed Tomography (CT) has strong penetrating power, the imaging contrast depends on the absorption coefficient of materials, and for a target pill formed by light elements such as carbon, deuterium and the like, the X-ray absorption difference is weak, so that the resolution of an internal microstructure is insufficient, and the refractive index distribution is difficult to accurately characterize. On the other hand, conventional optical microscopy, such as interference microscopy, can provide high phase sensitivity in the visible light band, but when dealing with samples with curved structures, it is often necessary to eliminate the influence of the refractive interface by means of an index matching liquid, the process is cumbersome, and errors or contamination may be introduced into the samples. In addition, most of the existing detection devices have single functions or rely on manual operation to collect and align multi-angle data, so that obvious defects exist in the aspects of light, mechanical, electric and control system integration level, automatic detection flow and integral imaging stability, and urgent requirements of high-throughput, repeatable and one-key three-dimensional imaging in scientific research and engineering application cannot be met. Although there have been studies attempting to apply techniques such as machine vision and optical tweezers manipulation to microsphere detection, these solutions mostly stay in the principle verification or modularization stage, and fail to form a complete solution integrating automatic illumination control, precise motion coordination, rapid image acquisition, robust three-dimensional reconstruction and automatic defect analysis. Therefore, the prior art (such as X-ray CT and traditional optical microscopy) has the defects of low imaging contrast, dependence on manual operation and refractive index matching liquid and insufficient system automation integration level when detecting transparent three-dimensional microspheres such as ICF target pills, and the like, so that high-throughput and high-precision automatic three-dimensional nondestructive detection cannot be realized. Disclosure of Invention The invention aims to provide a three-dimensional imaging detection integrated device and method for a carbon deuterium target pill, so as to overcome the problems in the prior art and realize automatic, quantitative and high-resolution three-dimensional imaging and evaluation of the morphology and internal defects of the target pill. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A three-dimensional imaging detection integrated device for a carbon deuterium target pill, comprising: An illumination mechanism comprising an addressable LED array light source and a drive circuit therefor; The imaging mechanism is in optical path connection with the illumination mechanism and comprises a micro optical system and a camera, and the micro optical system is arranged by an objective lens and a simple lens according to a 4f optical path structure; a sample manipulation mechanism comprising: The adsorption rotating unit is formed by mechanically connecting a rotating motor and a transparent suction nozzle and is used for fixing and rotating the target pill; The displacement positioning unit is formed by mechanically connecting a three-dimensional displacement table and a rotary table and is used for controlling the spatial position of the adsorption rotary unit; the object carrying unit is arranged in a layered manner and internally provided with a track for storing the target pills to be detected and detected; The control mechanism is respectively and electrically connected with the illumination mechanism, the imaging mechanism and the sample control mechanism, and comprises a main controll