Improving an optical displacement sensor accuracy under conditions of vibration impact on the monitored object

Abstract

Optical sensors based on a multi-element photodetector line are widely used in measuring technology. The effect of vibration on optical linear motion sensors is one of the factors that reduce the accuracy of measurements. An algorithm for processing the sensor signal is developed to reduce the negative impact of vibration on measurement accuracy. Numerical modeling methods are applied, and the characteristics of the Toshiba TCD1304 photodetector array are used as modeling parameters. The simulated range of the ratio of the period of integration of the photodetector array to the period of vibrations is from 0.02 to 2. The results of the study shows a decrease in measurement error compared with the sensor using the centroid method for estimating the linear position. Efficiency is achieved when the ratio of the integration period to the vibration period is greater than 0.1. Analysis of the results confirms the effectiveness of the developed signal processing algorithm in terms of increasing the dynamic metrological characteristics of linear motion sensors. The algorithm can be recommended for use in precision engineering and aeronautical engineering, where the problem of vibration interference is particularly relevant.