Abstract
A novel method is presented for of measuring absolute displacement with a synthesized wavelength interferometer. The optical phase of the interferometer is simultaneously modulated with a frequency-modulated laser diode and optical path-length difference. The error signal originating from the intensity modulation of the source is eliminated by a signal processing circuit. In addition, a lock-in technique is used to demodulate the envelope of the interferometric signal. The displacement signal is derived by the self-mixing technique.
© 1999 Optical Society of America
Full Article | PDF ArticleMore Like This
L. Montgomery Smith and Chris C. Dobson
Appl. Opt. 28(16) 3339-3342 (1989)
Dongmei Guo and Ming Wang
Appl. Opt. 46(9) 1486-1491 (2007)
Takamasa Suzuki, Takao Ohizumi, Tatsuhiko Sekimoto, and Osami Sasaki
Appl. Opt. 43(23) 4482-4487 (2004)