Macro Measurement System Based On The Psd Study

With laser technology, precision machinery technology, electronics and computer technology's advancement, Laser measurement Microshot gradually develops to high speed and precise multi-function, multi-parameter, and small size. It will have great significance and broad application prospects in machine vision, automated processing, industrial online testing, quality control, physical profile. biomedical fields,which will improve production efficiency and play a tremendous role in modernization of production level. In this paper,the system is designed for measuring displacement of vibration cartridge surface.This paper firstly introduces the current measurement of laser micro-state of development, and compares methods ranging's advantages and disadvantages, Laser triangulation measurement is selected as this paper's base of system design.Then we discussed the design process of PSD Microshot measurement system in detail.As a photovoltaic device, because of its high speed, high resolution, simple signal processing,PSD is used very widely. In this paper we use a one-dimensional comb PSD as a detector of system,and introduces the principle of PSD. On this basis, We use Multisim to analyse the linearity of comb-type PSD and the cause of error detection of PSD.In this paper,we present the design of the optical system,and improve the traditional optical triangulation measurement system,semiconductor lasers and fiber coupling method is used in light Source,which makes the system tend to be more miniaturization,the diameter of system is 20mm,in the end we use mathematical model to create the relationship between linearity, resolution and system parameters.The paper also analyzes the signal processing circuit system. MCU mode is choosed instead of using the traditional form with the operational amplifier calculation location circuit,which improves the repeatability of test and realizes automatic test of system.Finally, the system was calibrated and tests plane of different materials and gives all the testing planar curves,so the System has basically met the requirements of the project.