DOI: 10.17586/1023-5086-2018-85-10-56-60

A new matrix solution of the phase correlation technique in a brillouin dynamic grating sensor

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Abdollah Malakzadeh, Mohsen Mansoursamaei A new matrix solution of the phase correlation technique in a brillouin dynamic grating sensor (Новое матричное решение в методе фазовой корреляции для датчика на основе динамических бриллюэновских решёток) [на англ. яз.] // Оптический журнал. 2018. Т. 85. № 10. С. 56–60. http://doi.org/10.17586/1023-5086-2018-85-10-56-60

Abdollah Malakzadeh, Mohsen Mansoursamaei A new matrix solution of the phase correlation technique in a brillouin dynamic grating sensor (Новое матричное решение в методе фазовой корреляции для датчика на основе динамических бриллюэновских решёток) [in English] // Opticheskii Zhurnal. 2018. V. 85. № 10. P. 56–60. http://doi.org/10.17586/1023-5086-2018-85-10-56-60

For citation (Journal of Optical Technology):

Abdollah Malakzadeh and Mohsen Mansoursamaei, "New matrix solution of the phase-correlation technique in a Brillouin dynamic grating sensor," Journal of Optical Technology. 85(10), 644-647 (2018). https://doi.org/10.1364/JOT.85.000644

Abstract:

In phase correlation measurement technique of Brillouin dynamic grating sensors, two counter-propagating pump waves are modulated by a pseudo-random bit sequence (PRBS) which applies a random phase shift of either 0 or π with a specified period. In order to define the sensing length and spatial resolution, the shape of the correlation peak has to be found. So far, many methods have been used to demonstrate the phase correlation but, they often require several lengthy and sometimes complicated mathematical assumptions and equations. One of the techniques which has the best reported spatial resolution, is called the time gated phase correlation technique. We introduce a novel method based on matrix solution to show the phase modulation in the phase correlation technique. It is a straightforward and an intuitive pattern to visualize the phase modulation of the pumps and to attain the shape of the phase correlation peaks. Finally, the results of the matrix method are completely consistent with the previous results.

Keywords:

distributed fiber sensor, Brillouin dynamic grating (BDG), BDG sensor, matrix method, phase correlation technique

Acknowledgements:

Authors would like to thank Mrs. S.N. Jouybari for her advices and discussion about the BDG issues.

OCIS codes: 060.2370, 060.5060, 060.4370

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