Range Finding Using Frequency-Modulated Interferometry with a Monomode External-Cavity Laser Diode

概要

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A compact double-integrated Mach-Zehnder interferometer is proposed for range finding with a resolution better than 10 μm. It uses a short-external-cavity laser diode which is tuned by modulating the injection current. One of the interferometers is used as a reference for systematic calibration. The other one enables the measurement of the distance. A direct comparison between the phase determined using the measuring interferometer with that given in the reference interferometer results in the increase of the measurement resolution. The results are stabilized for external air-refractive index fluctuations, and the frequency shift of the laser is reduced. The technique can be used to measure absolute distance and velocity of a target with directional discrimination.
社団法人応用物理学会の論文
1996-05-15