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|Title:||Ultrasonic hydrophone based on distributed Bragg reflector fiber laser|
Lau, Sien Ting
Chan, Helen L. W.
Optical fiber transducers
|Source:||IEEE photonics technology letters, Jan. 2005, v. 16, no. 1, p. 169-171|
|Abstract:||We demonstrate a novel fiber-optic hydrophone that uses a dual polarization distributed Bragg reflector (DBR) fiber laser as sensing element. The operation principle is based on the modulation of the birefringence of the fiber laser by high-frequency ultrasound. By measuring the amplitude and frequency of the sidebands as well as the polarization beat frequency of the output of the fiber laser using a photodetector and a radio-frequency spectrum analyzer, the amplitude and frequency of the acoustic pressure, and temperature can be determined simultaneously. The DBR fiber laser hydrophone has a linear response to acoustic pressure and can detect acoustic frequency up to at least 40 MHz.|
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|Appears in Collections:||AP Journal/Magazine Articles|
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