Note: Intensity control of a phase-shift based laser scanner for reducing distance errors caused by varying surface reflectivity

Abstract

In the phase-shift measurement method, the distance traveled by light can be obtained on the basis of the phase difference between the reference signal and the measured signal. When a different colored object is measured, the intensity of the measured signal varies greatly, even at the same distance, which causes a different phase delay owing to the wide dynamic range input into the signal processing circuit. In this study, an intensity control method is proposed to solve this phase delay problem. (C) 2011 American Institute of Physics. [doi:10.1063/1.3665922]