Miniature all-fiber Fabry-Perot sensor for Simultaneous Measurements of Pressure and Temperature
- received 04/05/2012; accepted 05/11/2012; posted 05/17/2012; Doc. ID 166110
- Abstract: This paper presents a miniature, high-sensitive, all-silica Fabry-Perot fiber optic sensor suitable for simultaneous measurements of pressure and temperature. The proposed sensor consists of two low fines Fabry-Perot resonators, created at the tip of an optical fiber. The first resonator is embodied in the form of a short air cavity positioned at the tip of the fiber. This resonator utilizes a thin silica diaphragm to achieve the sensor’s pressure response. The second resonator exploits the refractive index-dependence of silica fiber in order to provide the proposed sensor’s temperature measurement function. Both resonators have substantially different lengths that permit straightforward spectrally-resolved signal-processing and unambiguous determination of the applied pressure and temperature.
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