Design and analysis of range finder for medium distance

This paper introduces the research and design of laser triangulation measurement system based on linear array CCD, and the correctness of the theoretical analysis and the feasibility of the design will be verified by the experiments. The principle of optical system of direct-incident laser triangulation measurement is analyzed theoretically from laser triangulation measurement principle and practical measurement requirement. A measurement system, which consists of a semiconductor laser source, an imaging Plano-convex lens, and a high-speed linear CCD, is designed. In these experiments, the high-speed linear array CCD optoelectronic data are obtained by acquisition and transmission system of USB interface. Through the corresponding relation between displacement variation of measured object and the pixel position of laser spot imaging on linear CCD, the measurement system uses the different fitting equations to be calibrated. Comparing displacement variation of the calibration results calculating with the actual one, the results shows that the measurement precision of using the four fitting can reach 0.47 mm, the range of measuring is 200 mm. The results show that the measurement system is correct and valid for medium displacement measurement.