Measurement of temperature and strain using Brillouin optical frequency-domain analysis method

Vladimir A. Saetchnikov; Ellyn A. Chernyavskaya; Tatjana P. Yanukovich

doi:10.1117/12.454671

5 February 2002 Measurement of temperature and strain using Brillouin optical frequency-domain analysis method

Vladimir A. Saetchnikov, Ellyn A. Chernyavskaya, Tatjana P. Yanukovich

Proceedings Volume 4680, Second International Conference on Lasers for Measurement and Information Transfer; (2002) https://doi.org/10.1117/12.454671
Event: Second International Conference on Lasers for Measurement and Information Transfer, 2001, St. Petersburg, Russian Federation

Abstract

In the method of Brillouin optical frequency-domain analysis (BOFDA), the continuous wave light of narrow linewidth pump laser is coupled into one end of the sensor fiber and a sinusoidal modulated intensity of a probe laser is coupled to the other end. If the frequency difference between both lasers equals to characteristic Brillouin frequency, the pump light will interact with the modulated probe light in the fiber. By analyzing the transmitted pump intensity at different frequency differences between probe and pump lasers, the temperature and strain distribution along the fiber can be determined. Numerical simulation of a BOFDA is represented. In this numerical simulation several fiber lengths with different but spatial constant gain coefficients were placed one after another. For each fiber part the fundamental oscillation of the transmitted pump intensity is calculated by the derived analytical expression. The model of three-wave interaction is used in numerical simulation: interaction of pump, Stokes and acoustic wave. Final decisions are made in assumption of little change of acoustic wave.

Citation Download Citation

Vladimir A. Saetchnikov, Ellyn A. Chernyavskaya, and Tatjana P. Yanukovich "Measurement of temperature and strain using Brillouin optical frequency-domain analysis method", Proc. SPIE 4680, Second International Conference on Lasers for Measurement and Information Transfer, (5 February 2002); https://doi.org/10.1117/12.454671

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