Amplitude measurement of a sinusoidally oscillating object using a frequency-ramped laser diode with some intensity modulation indices

Masaaki M. Imai; Masashi Kondoh; Naohiro Murakami

doi:10.1117/12.347746

7 May 1999 Amplitude measurement of a sinusoidally oscillating object using a frequency-ramped laser diode with some intensity modulation indices

Masaaki M. Imai, Masashi Kondoh, Naohiro Murakami

Author Affiliations +

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347746
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

An optical heterodyne interferometer with a frequency-ramped laser diode (LD) has been constructed for amplitude measurements of a sinusoidally oscillating object. In order to eliminate the effect of intensity modulation without complexity in optical setup, an optical interferometry operating under a small index of intensity modulation has been proposed and its effect on the amplitude measurements of an oscillating object has been analyzed based on spectral analysis of interference beat signal. From the simplified analysis for some ratios of beat frequency to modulation (ramped) frequency and for some intensity modulation indices, it is confirmed that the theoretical analysis and the experimental results are in relatively good agreement.

Citation Download Citation

Masaaki M. Imai, Masashi Kondoh, and Naohiro Murakami "Amplitude measurement of a sinusoidally oscillating object using a frequency-ramped laser diode with some intensity modulation indices", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347746

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