Estimation of BOFDA method measurement time

Vladimir A. Saetchnikov; Elina A. Tcherniavskaia; Tatjana P. Yanukovich

doi:10.1117/12.501550

19 June 2003 Estimation of BOFDA method measurement time

Vladimir A. Saetchnikov, Elina A. Tcherniavskaia, Tatjana P. Yanukovich

Proceedings Volume 5066, Lasers for Measurements and Information Transfer 2002; (2003) https://doi.org/10.1117/12.501550
Event: Lasers for Measurements and Information Transfer 2002, 2002, St. Petersburg, Russian Federation

Abstract

Large amounts of optic fiber sensors are developed now for measurement of different physics parameters, for example temperature and strain. Use of big length optical fibers allows developing distributed sensors. This work is dedicated to theoretical study of distributed sensor of temperature and strain using method of Brillouin Optical Frequency Domain Analysis (BOFDA). Theoretical description of Brillouin dispersion in optical fiber is based on three-wave interaction model: pump laser wsve, Stockes wave and acoustic wave. Two-wave interaction model is used in assumption of small modulation depth; acoustic wave doesn't change. Stationary solve of three-wave model is used for measurement result modeling. In the result of numerical model pulse response is calculated as a function of coordinate and frequency. The method for temperature and strain magnitude determination and their distribution is proposed. The methods accuracy estimation was made. To estimate time of measurement the numerical solve of three-wave model is used. Stationary interaction in optical fiber is settled at 6*10^-6 sec for 200 m long fiber. This figure is dependent on length of the sensor fiber. Time delay is due to light velocity in optical fiber and settlement of stationary acoustic wave.

Citation Download Citation

Vladimir A. Saetchnikov, Elina A. Tcherniavskaia, and Tatjana P. Yanukovich "Estimation of BOFDA method measurement time", Proc. SPIE 5066, Lasers for Measurements and Information Transfer 2002, (19 June 2003); https://doi.org/10.1117/12.501550

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