Koichi MARU and Takahiro HATA

Department of Electronics and Information Engineering, Faculty of Engineering, Kagawa University, Takamatsu 761-0396, Japan

(Received August 10, 2012; Accepted November 24, 2012)

An axial non-mechanical scan in the laser Doppler velocimeter (LDV) using a single diffraction grating is demonstrated. The measurement position in this LDV is axially scanned using a wavelength change and a dispersion function of the grating. The experimental result using a sensor probe setup indicates that a scanning function is successfully obtained with a simpler arrangement than that of the LDV previously reported, and the ratio of the scanning range to the working distance can be enhanced by virtue of using larger angular dispersion.

Key words: laser Doppler velocimetry, interferometry, diffraction grating, axial scan