| Laser triangulation is a non-contact measurement method with simple structure and strong real-time performance.It is widely used in industrial manufacturing and construction fields,and is an indispensable measurement method for manufacturing quality assurance.Because domestic laser triangulation sensors have problems such as poor real-time performance,poor applicability,and small measurement range,the market is mainly based on foreign products and expensive.Therefore,the research and design of self-control laser triangulation ranging sensing technology has important practical significance for improving the level of Intelligent Manufacturing in China.Based on the analysis of the principle and performance characteristics of laser triangulation,this paper optimizes the optical model of laser triangulation by simulated annealing algorithm,studies and designs a laser triangulation displacement Rangefinder Based on embedded system,which can realize real-time and high-precision displacement measurement.In this paper,the design and accuracy improvement of laser triangulation range finder are studied.The key technologies of triangulation range finder,optical system parameter optimization,system hardware and software design,sensor calibration,adaptive laser power adjustment control,spot center extraction,error analysis and so on are studied.The large range triangulation displacement measurement system is designed and developed,which is helpful to realize the self-control of triangulation range finder It has certain practical significance.In the process of researching the laser triangulation displacement measurement sensor:firstly,the principle and projection method of triangulation displacement measurement are analyzed.Secondly,in combination with the requirements of the system,a hardware system based on CPLD and STM32 was designed to complete the collection and processing of the spot signal.According to the reset noise accompanying the CCD output signal,the correlated double sampling technique is used to suppress.Then,aiming at the problem that the measurement distance and the surface characteristics affect the measurement accuracy,through the experimental analysis of the light spot quality change,a power adaptive control algorithm is proposed to improve the measurement accuracy,and achieve the power adaptive adjustment and stable control.Then,the center processing algorithm of the spot was studied,which laid the foundation for the software to improve the measurement accuracy.Finally,the calibration algorithm of the sensor is researched,and the measurement error is effectively reduced by the method of residual compensation.According to the experimental results,the accuracy of the displacement measuring instrument reaches 0.17% when the working distance is 450 mm and the measuring range is 300 mm.The research of this system provides a theoretical basis for our country’s independent design. |
