Influence of laser noise on sensitivity of fiber optic sensors

Vladimir M. Nikolaev; Oleg I. Kotov; Leonid B. Liokumovich; Dmitrii V. Khoptiar

doi:10.1117/12.347447

5 May 1999 Influence of laser noise on sensitivity of fiber optic sensors

Vladimir M. Nikolaev, Oleg I. Kotov, Leonid B. Liokumovich, Dmitrii V. Khoptiar

Proceedings Volume 3687, International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (1999) https://doi.org/10.1117/12.347447
Event: International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 1998, St. Petersburg, Russian Federation

Abstract

Interferometric fiber optic sensors (FOS) are often used for the nondestructive precision measurement of wide spectrum of physical units such as temperature, pressure, acoustic and electromagnetic fields. Their pinpoint accuracy and high dynamic range are aptly combine with unique advantages of fiber optic element base. One of the most essential factors, limiting sensitivity of such sensors is noise of radiation source (laser). Thought for design and development sensors it is necessary to know a spectrum of laser noise in the range of measured influences. Noise features of semiconductor lasers are sufficiently well known. Gas lasers, by reason of their high coherence, are often used in interferometric FOS. However, information about their amplitude noise spectrum is relatively little. In given work are shown results of intensity noise measurements for serially produced small-size gas lasers, suitable for FOS. Besides, sensitivity can be greatly affected by increasing of noise, caused by the light, reflected back in the laser from different optical components of scheme. For this reason in work are brought measurements results of influence back-reflected light upon amplitude noise of laser.

Citation Download Citation

Vladimir M. Nikolaev, Oleg I. Kotov, Leonid B. Liokumovich, and Dmitrii V. Khoptiar "Influence of laser noise on sensitivity of fiber optic sensors", Proc. SPIE 3687, International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (5 May 1999); https://doi.org/10.1117/12.347447

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KEYWORDS

Fiber optics sensors

Gas lasers

Sensors

Fiber lasers

Mirrors

Optical components

Photodetectors

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