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Optical Engineering

Real-time vibration measurement using a feedback type of laser diode interferometer with an optical fiber
Author(s): Takamasa Suzuki; Takao Okada; Osami Sasaki; Takeo Maruyama
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Paper Abstract

A laser diode interferometer that uses an optical fiber is proposed. The laser diode simultaneously functions as a light source, a phase modulator, and a phase compensator. Detection of the vibration and reduction of external disturbance are carried out using a feedback control for the injection current of the laser diode. Thus it can measure vibration accurately in real time with a simple signal processing circuit. The optical fiber not only functions as a flexible probe, enabling us to measure the vibration of an object that cannot be moved onto the optical bench, it also acts as a reference mirror, thereby simplifying the unit construction. The principle of the feedback control in laser diode interferometer is also described in detail.

Paper Details

Date Published: 1 September 1997
PDF: 7 pages
Opt. Eng. 36(9) doi: 10.1117/1.601475
Published in: Optical Engineering Volume 36, Issue 9
Show Author Affiliations
Takamasa Suzuki, Niigata Univ. (Japan)
Takao Okada, Niigata Univ. (Japan)
Osami Sasaki, Niigata Univ. (Japan)
Takeo Maruyama, Niigata Univ. (Japan)

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