Abstract

A differential laser Doppler velocimeter (LDV) with enhanced wavelength range for small wavelength sensitivity is proposed by using cascaded Mach–Zehnder interferometers (MZIs) for shifting the position of the beam at the input plane according to the wavelength. The cascaded MZI structures are used to enhance the position shift of the beam at the input plane compared with the use of single-stage MZIs. The gradual shift in the incident angle of the beam to the object is brought about with the combination of cascaded MZI structures, lenses and apertures. The simulation results indicate that the wavelength range for small wavelength sensitivity can be successfully enhanced by using two-stage cascaded MZI structures.

© 2010 IEEE

Wavelength-insensitive laser Doppler velocimeter using beam position shift induced by Mach-Zehnder interferometers

Koichi Maru and Yusaku Fujii
Opt. Express 17(20) 17441-17449 (2009)

Multi-point differential laser doppler velocimeter using arrayed waveguide gratings with small wavelength sensitivity

Koichi Maru, Kohjiro Kobayashi, and Yusaku Fujii
Opt. Express 18(1) 301-308 (2010)

Nonmechanical transverse scanning laser Doppler velocimeter using wavelength change

Koichi Maru, Toshiki Fujiwara, and Ryusuke Ikeuchi
Appl. Opt. 50(32) 6121-6127 (2011)

Axial scanning laser Doppler velocimeter using wavelength change without moving mechanism in sensor probe

Koichi Maru
Opt. Express 19(7) 5960-5969 (2011)

Monostatic coaxial 1.5 μm laser Doppler velocimeter using a scanning Fabry-Perot interferometer

Peter John Rodrigo and Christian Pedersen
Opt. Express 21(18) 21105-21112 (2013)