A novel Laser Doppler Velocimeter based on a liquid lens

Abstract

This paper proposed a novel Laser Doppler Velocimeter (LDV) based on an electrically tunable lens (ETL) to change the working distance and to extend the measuring range of LDV. On the basis of Gaussian optics, the positions along with the size of waist spot are simulated under different driving current of ETL. In addition, the working distance and measuring range of LDV under different offset lenses were measured. The results demonstrate that the LDV based on ETL is able to change the working distance and effectively enlarge the measuring range of LDV, whose volume is reduced simultaneously.