Real-time vibration measurement using a feedback type of laser diode interferometer with an optical fiber

Takamasa Suzuki; Takao Okada; Osami Sasaki; Takeo Maruyama

doi:10.1117/1.601475

1 September 1997 Real-time vibration measurement using a feedback type of laser diode interferometer with an optical fiber

Takamasa Suzuki, Takao Okada, Osami Sasaki, Takeo Maruyama

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Optical Engineering, Vol. 36, Issue 9, (September 1997). https://doi.org/10.1117/1.601475

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.

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Takamasa Suzuki, Takao Okada, Osami Sasaki, and Takeo Maruyama "Real-time vibration measurement using a feedback type of laser diode interferometer with an optical fiber," Optical Engineering 36(9), (1 September 1997). https://doi.org/10.1117/1.601475

Published: 1 September 1997

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