Research On Key Technologies Of High Fluence Optics Damage On-line Inspection

In laser inertial confinement fusion research background, According to laserinduced damage online detection problem of the high power laser driving device,studies the technical route and key technique of on-line detection. The main researchcontents are as follows:Designed the optical element on-line detection of the overall technical route,design the high resolution imaging system and based on the principle of total reflectionof the laser optical lighting system, by scanning detection and image matching realizedthe high resolution imaging of large-size optical element, combined with total reflectionlighting technology in the weak damage imaging signal with high signal-to-noise ratio,improve the detection accuracy;Studies the technique of image alignment based on RANSAC and weightedaverage method of image fusion technology, and designed the algorithm of imagealignment and Mosaic achieve more accurate alignment between sub image and joiningtogether;The paper studied based on the multi-scale threshold segmentation of the localsignal-to-noise ratios (SNRS) which is the optical element damage image damage pointdetection algorithm, and solve the noise interference of light and image signal-to-noiseratio distribution under the condition of damage signals leakiness problem.Prototype is developed, and the online damage detection experiment is finished,the experimental results show that the developed optical element damage on-linedetection system can measure damage point size from more than50μm (damage pointdetection probability of100%) to120μm (damage detection precision of σ<11.1%,meet the requirements of damage detection, provides effective means of damage testingand research for large size optical element.