Chinese Optics Letters, 2004, 2 (6): 06328, Published Online: Jun. 6, 2006
Double sinusoidal phase modulating laser diode interferometer for thickness measurements of transparent plates Download: 613次
Abstract
A double sinusoidal phase modulating (SPM) laser diode interferometer for thickness measurements of a transparent plate is presented. A carrier signal is given to the interference signal by using a piezoelectric transducer, and the SPM interferometry is applied to measure the thickness of a transparent plate. By combining the double-modulation technique with the Bessel function ratio method, the measurement error originating from light intensity fluctuations caused by the modulation current can be decreased greatly. The thicknesses of a glass parallel plate and a quartz glass are measured in real time, and the corresponding experimental results are also given.
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Dailin Li, Xiangzhao Wang, Yingming Liu. Double sinusoidal phase modulating laser diode interferometer for thickness measurements of transparent plates[J]. Chinese Optics Letters, 2004, 2(6): 06328.