Abstract
We theoretically and experimentally investigate the performance of an ultrasound detection system based on a fiber ring laser (FRL) whose cavity includes a pair of fiber Bragg gratings. The ultrasonic detection is achieved by the FRL power variations in response to the ultrasound-induced cold-cavity loss modulation of the FRL. The effects of key FRL parameters, including pump power, laser cold-cavity loss, and laser cavity length, on the system signal-to-noise ratio (SNR) performance have been investigated. It is found that the maximum SNR is achieved when the frequency of the ultrasound is the same as that of the FRL relaxation oscillation (RO). Harmonic generations are more prominent when the ultrasonic frequency is at the RO frequency and highly dependent on the strength of the ultrasonic signal. The analysis provides a useful tool for the understanding and optimization of such ultrasonic sensor systems.
Original language | English (US) |
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Article number | 6974999 |
Pages (from-to) | 2848-2855 |
Number of pages | 8 |
Journal | IEEE Sensors Journal |
Volume | 15 |
Issue number | 5 |
DOIs | |
State | Published - May 26 2015 |
Keywords
- Fiber Bragg gratings
- Fiber lasers
- Fiber-optic sensors
- nondestructive testings
ASJC Scopus subject areas
- Instrumentation
- Electrical and Electronic Engineering