IJAT Vol.5 No.2 pp. 126-131
doi: 10.20965/ijat.2011.p0126


Two-Wavelength Laser Interferometer System Which Reduces the Uncertainty Caused by the Fluctuation of the Refractive Index of Air

Kaoru Miyata, Hidekazu Oozeki, Hideyuki Nakagawa,
Hiroki Masuda, and Hisayoshi Sakai

Mitutoyo Corporation, 430-1 Kamiyokoba, Tsukuba-shi, Ibaraki-ken 305-0854, Japan

November 26, 2010
December 22, 2010
March 5, 2011
laser interferometer, two-wavelength interferometer, two-wavelength interferometry, refractive index of air, precision measurement
Laser interferometers are widely used to measure highly sensitive length and displacement, e.g., in which refractive index fluctuations of air adversely affect measurement accuracy. To compensate for these effects, the two-wavelength interferometer studied has not yet proved practical in industrial use. We studied the interferometer’s performance and practicality, using uncertainty analysis to extract its features. Based on our results, we developed a two-wavelengthMichelson interferometer with wavelengths of 1064 nm and 532 nm. It was calibrated and evaluated using a highprecision laser interferometer whose optical path was in a vacuum. Results confirmed measurement accuracy of 100 nm/50 mm (k=2) under unstable air conditions - superior to a traditional laser interferometer.
Cite this article as:
K. Miyata, H. Oozeki, H. Nakagawa, H. Masuda, and H. Sakai, “Two-Wavelength Laser Interferometer System Which Reduces the Uncertainty Caused by the Fluctuation of the Refractive Index of Air,” Int. J. Automation Technol., Vol.5 No.2, pp. 126-131, 2011.
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