Title :
Coherence dependence of fiber-optic laser Doppler velocimeter output using self-mixing laser diode
Author :
Shinohara, Shigenobu ; Yonezu, Naohiro ; Ikeda, Hiroaki ; Yoshida, Hirofumi ; Sumi, Masao
Author_Institution :
Shizuoka Univ., Hamamatsu, Japan
Abstract :
A new laser Doppler velocimeter (LDV) employing a self-mixing laser diode (SM-LD), which has a long optical fiber of 10 m to 1 km, as a light guide. This new LDV can measure a Doppler best signal with high signal to noise ratio in the range of 20-40 dB. The reason why the Doppler beat signal is obtained from a photodiode accommodated in the SM-LD having such a long fiber is attributed to the coherence length enhancement of the SM-LD, which extends to 400 m or more
Keywords :
Doppler measurement; fibre optic sensors; laser velocimeters; light coherence; photodiodes; semiconductor lasers; 10 m to 1 km; 20 to 40 dB; LDV; coherence length enhancement; fiber-optic laser Doppler velocimeter; photodiode; self-mixing laser diode; signal to noise ratio; Diode lasers; Fiber lasers; Frequency; Loudspeakers; Magnetic field measurement; Optical fiber polarization; Optical fibers; Packaging; Photodiodes; Signal to noise ratio;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1993. IMTC/93. Conference Record., IEEE
Conference_Location :
Irvine, CA
Print_ISBN :
0-7803-1229-5
DOI :
10.1109/IMTC.1993.382606
