Design And Research Of Laser Reflection Detection System

With the rapid development of industries such as optics,semiconductors,and aerospace,the product performance and reliability of optical components have become crucially important.Correspondingly,the quality inspection technology for optical components has become increasingly important.This project has designed a laser reflection detection system that can be used to perform reflectivity repeatability tests on standard lenses.The system provides highquality light beams and measures the laser reflection spots and power intensity at different parts of the optical lens.By processing and analyzing the collected power and spot data,it can detect the quality of the optical surface coating or lens.This article mainly focuses on the research of the detection of reflectivity of optical lenses and the measurement and analysis of laser spots.The main work includes the following aspects:(1)This article designs the overall scheme of the laser reflection detection system.The system is divided into laser power detection module,motion control module,laser spot analysis module,and laser projection module,and introduces the working principles of each module.According to the needs of this test platform for detecting small-sized flat mirrors and largesized concave mirrors,the measurement path is designed to collect data on laser power and laser spots of different-sized lenses.(2)The application and implementation of image preprocessing algorithms and spot analysis algorithms are carried out.The analysis and comparison of classic image preprocessing algorithms are performed to select the best algorithm to process the collected spot images of this system.The image preprocessing operations used in this system include grayscale conversion,filtering,threshold segmentation,and morphological processing.Then,the Canny operator is used to detect the edge of the laser spot,and the feature parameters of the spot image are obtained by fitting the edge using the least squares method.(3)The software and hardware design of the laser reflection detection system is conducted.In hardware,in order to give the system stronger instruction processing capability,a motion control card is used as the control center of the system and secondary development is carried out on it.Then,the main system components and power supply system are introduced.In software,a software system is developed on the QT platform using the C++ programming language,which implements functions such as motion control,trajectory planning,collection of power data and spot data.(4)A measurement system experimental platform is built to verify the system design scheme.The laser power at each position in the system is collected to calculate the reflectivity and transmittance of the measured sample lens.The measurement results achieve the expected target.By controlling the multi-axis motion platform to adjust the position and angle of the measured lens and the reflection mirror,the purpose of accurately detecting each position of the measured lens is achieved.After collecting the spot reflected by the measured lens,the spot image is analyzed and processed to obtain its feature parameters.Finally,the quality of the lens is detected based on the transmittance and reflectivity of the sample lens and the feature parameters of the reflected spot.The experimental results show that the system meets the requirements.