Output Characteristics Of Laser Displacement Sensor And Its Application

Compared to traditional measurement, because it's non-contact, high sensitivity, fast and real-time and high accuracy, optical precision measurement has been widely used in scientific research, industrial production, space technology and defense, it is a very advanced measurement techniques. Laser displacement sensor based on triangulation has been rapidly developed in recent years and its application is extremely broad. In detecting the size of the part, three-dimensional profile measurement, product quality inspection and other areas, the method greatly improved the efficiency and accuracy of industrial production. It is an important research area using laser displacement sensor in non-contact measurement of parts. The technology uses laser triangulation measurement principle, the focused laser beam from the sensor emitted to the object surface, the light is diffused and reflected to the test surface through the imaging lens.The output signal of sensor only have relations with the position of measured points, when the surface height of point changes, the image point of sensor also changes accordingly, causing the sensor output signal changes.In the measurement of part by laser triangulation displacement sensor, surface characteristics:roughness, surface color, surface tilt angle, they have greet impact on measurement accuracy. Before measuring the part, make experimental study for various factors, analyzes the law to affect the measurement precision. When measure the cam profile, make reasonable arrangement of the laser displacement sensor, minimize the measurement error by calculating the installation position and angle.The main work of this paper is as follows:1.According to different characteristics of the measuring surface, the laser displacement sensor was studied by experiment. Analyze the law of the measurement results caused by surface roughness, tilt angles, and surface curvature of object and find the appropriate measures to reduce measurement error. 2-Developed the model for measuring disk-shaped cam profile, made accurate calculation for mounting position and angle of laser displacement sensor, simulated feasibility of the measurement, and reasoned the relationship between the measurements and parameters of cam profile. Proceeded non-contact static measurement to cam profile based on the calibration results of the sensor and processed the data.