Laser Displacement Sensor in the Application of Aero-Engine Blade Measurement

Abstract

This paper proposes a novel error-compensation model that can effectively reduce the impact of the incident angle error of a laser displacement sensor (LDS) that measures accuracy. The laser triangulation method is an effective method of measurement. It is characterized by non-contact, large measuring range and high measuring efficiency. However, the measurement accuracy is affected by the incidence angle. To improve the measurement accuracy, a practical measurement strategy is presented. The experiment was carried out using a standard hard alloy ball calibration LDS. By introducing the error model, the experimental data were improved. Finally, in the application of an aero-engine blade measurement, the crossed curves method was used to calculate incidence angle of the measuring point. By comparing the LDS with a high-precision coordinate measuring machine (CMM) in experiments, the LDS accuracy is significantly improved; the results show that the laser measuring system has the thinner structure and higher efficiency than the CMM, so this paper is worth promoting.