A fiber air-gap Fabry-Pérot temperature sensor demodulated by using frequency modulated continuous wave
Abstract
In this study, a fiber in-line air-gap Fabry-Pérot interferometer (FPI) is fabricated by HF acid etching. For a low-cost and higher precise measurement, a demodulation system based on frequency modulated continuous wave (FMCW) technique is build up and demonstrated in this air-gap FPI. In temperature measurements, the temperature sensitivity is about 1.75 rad/°C by phase shift detection. We also test the long term performance of the system and the RMS error is about 0.04 rad, which corresponds to the temperature resolution of ~0.02 °C. It is much higher than the measurement resolution by using the traditional wavelength shift detection method. Our experiments show that the FMCW can provide a low-cost, high resolution and high speed interrogation solution to the fiber FPIs.
- Publication:
-
Optics Communications
- Pub Date:
- 2014
- DOI:
- 10.1016/j.optcom.2014.03.065
- Bibcode:
- 2014OptCo.324..234Z