Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor

被引：0
|
作者：
Ma, Jun [1 ,2 ]
Yu, Yongqin [3 ]
Jin, Wei [1 ,2 ]
机构：
[1] Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen, Peoples R China
[3] Shenzhen Univ, Shenzhen Key Lab Sensor Technol, Coll Phys Sci & Technol, Shenzhen, Peoples R China
来源：
FIFTH ASIA-PACIFIC OPTICAL SENSORS CONFERENCE | 2015年 / 9655卷
关键词：
Optical fiber sensor; Sagnac interferometer; acoustic sensor; graphite diaphragm; PRESSURE; ARRAY;
D O I：
10.1117/12.2184271
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A modified fiber-optic Sagnac interferometer with a stable pi/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of similar to 450 mu Pa/Hz(1/2) at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.
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页数：4
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