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Optical Engineering

Absolute distance measurement using wavelength-multiplexed phase-locked laser diode interferometry
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Paper Abstract

A new type of two-wavelength interferometer which applies a phase-lock technique is described. The wavelength tunability of a laser diode (LD) is used for phase modulation and phase control in this interferometer. Since the two wavelengths are derived from a single LD in our system, the optical system is simple and there is no need to consider the fluctuation of relative wavelength between the two LD’s in the conventional two-wavelength interferometers. The equivalent wavelength ? is 15 mm and the measurement accuracy reaches ~?/400. The error sources in the system and the error analysis are also described.

Paper Details

Date Published: 1 February 1996
PDF: 6 pages
Opt. Eng. 35(2) doi: 10.1117/1.600921
Published in: Optical Engineering Volume 35, Issue 2
Show Author Affiliations
Takamasa Suzuki, Niigata Univ. (Japan)
Osami Sasaki, Niigata Univ. (Japan)
Takeo Maruyama, Niigata Univ. (Japan)

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