Abstract
This paper describes a phase-demodulated fiber-optic sensor suitable for non-contact vibration detection. The sensor is based on an extrinsic Fabry-Perot (F-P) cavity, formed by a capsulated sensor head and the probed surface. The sensor head, bonded on a piezoelectric (PZT) stack, is driven by a continuous sinusoidal wave, which introduces phase modulation in the interference signal. The varied small displacement induced by vibration of the surface under test is detected utilizing an improved phase-generated carrier technique. The configured F-P sensor is compact and highly sensitive, since neither extra optical path nor frequency modulation of light source is employed for demodulation. Characterization experiment is also conducted using a PZT vibration exciter. The sensor exhibits a high signal-to-noise ratio of 41 dB at 1 kHz and noise limited detectable phase level of 6.3× 10-5 rad, corresponding to a minimum vibration sensitivity of 7.8 pm.
| Original language | English |
|---|---|
| Article number | 7177034 |
| Pages (from-to) | 7229-7233 |
| Number of pages | 5 |
| Journal | IEEE Sensors Journal |
| Volume | 15 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2015 |
| Externally published | Yes |
Keywords
- Fabry-Perot interferometer
- Fiber optics sensors
- vibration sensors
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