A passive homodyne fibre vibrometer using a three-phase detector array
- 1 August 1993
- journal article
- Published by IOP Publishing in Measurement Science and Technology
- Vol. 4 (8) , 854-859
- https://doi.org/10.1088/0957-0233/4/8/010
Abstract
A non-contact, optical fibre-based vibrometer is described with output in the form of a set of spatial fringes. The fringe system is sampled at three different phases using a non-multiplexed linear detector array. No source frequency modulation is necessary, allowing convenient use of a wide variety of lasers, and surface motion is measured free from directional ambiguity. Fringe interpolation and multiple-fringe unwrapping are effected using a digital fringe processor. With a received power of 4 nW, a minimum noise-equivalent phase sensitivity of 150 mu Rad Hz-1/2 is demonstrated.Keywords
This publication has 4 references indexed in Scilit:
- Minimum detectable phase shift in spectrum-analysis techniques of optical interferometric vibration detectionApplied Optics, 1992
- Interferometric angle encoderReview of Scientific Instruments, 1991
- Optical homodyne phase metrologyApplied Optics, 1989
- Synthetic-heterodyne interferometric demodulationIEEE Journal of Quantum Electronics, 1982