Opto-Acoustic Fiber Sensor

Q. Munir; H. P . Weber; R. Battig

doi:10.1117/12.943679

27 March 1985 Opto-Acoustic Fiber Sensor

Q. Munir, H. P . Weber, R. Battig

Proceedings Volume 0492, 1984 European Conf on Optics, Optical Systems, and Applications; (1985) https://doi.org/10.1117/12.943679
Event: 1984 European Conference on Optics, Optical Systems and Applications, 1984, Amsterdam, Netherlands

Abstract

An optoacoustic sensor for trace analysis in gases was constructed and experimentally tested. The crucial element in such systems, the highly sensitive electronic microphone, was replaced by a fiberoptic interferometer in the Mach-Zehnder configuration. The fiber of the sensing arm was wrapped onto a thin foil arranged close to the cylindrical walls of the acoustic cell. Thus the acoustical waves generated by the absorbed light were transferred to an elongation of the fiber. The cell was operated at one of its resonances. A sensitivity of ~ 50 ppb was evaluated for an input power of 500 mW radiation of an Ar-laser for the detection of NC^ in an inert buffer gas. Presently the minimum observable power is 7-10" 8 W/citiv/f!zl . Details on this device are described in 1 and 2 .

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Q. Munir, H. P . Weber, and R. Battig "Opto-Acoustic Fiber Sensor", Proc. SPIE 0492, 1984 European Conf on Optics, Optical Systems, and Applications, (27 March 1985); https://doi.org/10.1117/12.943679

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KEYWORDS

Fiber optics sensors

Acoustics

Fiber optics

Gases

Interferometers

Sensors

Applied physics

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