Title :
New monostatic balanced Doppler velocimeter using a high birefringence fiber
Author :
Battig, R. ; Stierlin, Roland ; Henchoz, Pierre-david ; Weber, Heinz P.
Author_Institution :
Inst. of Appl. Phys., Bern Univ., Switzerland
fDate :
1/1/1988 12:00:00 AM
Abstract :
A novel fiber-optic Doppler velocimeter is presented. By suitably controlling the polarization state of the local oscillator, illuminating beam, and signal light, balanced mixing with a noise reduction of 30 dB as compared to unbalanced mixing can be realized. The remaining noise level is predominantly due to shot noise. Allowing for losses in the receiving optics and for nonperfect mixing efficiency, the minimum detectable signal power is estimated to be 10-18 W-Hz-1 . The high sensitivity of the system is demonstrated by the detection of light scattered from a distant moving object
Keywords :
Doppler effect; fibre optic sensors; optical losses; velocity measurement; balanced mixing; birefringence fiber; distant moving object; illuminating beam; light scattering; local oscillator; minimum detectable signal power; monostatic balanced Doppler velocimeter; noise reduction; nonperfect mixing efficiency; polarization state; sensitivity; shot noise; signal light; unbalanced mixing; Lighting control; Local oscillators; Noise level; Noise reduction; Optical fiber polarization; Optical losses; Optical mixing; Optical noise; Optical scattering; Optical sensors;
Journal_Title :
Lightwave Technology, Journal of
