1 February 1996 Absolute distance measurement using wavelength-multiplexed phase-locked laser diode interferometry
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Optical Engineering, 35(2), (1996). doi:10.1117/1.600921
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.
Takamasa Suzuki, Osami Sasaki, Takeo Maruyama, "Absolute distance measurement using wavelength-multiplexed phase-locked laser diode interferometry," Optical Engineering 35(2), (1 February 1996). http://dx.doi.org/10.1117/1.600921
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KEYWORDS
Distance measurement

Feedback signals

Modulation

Interferometers

Phase interferometry

Semiconductor lasers

Phase shift keying

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