Abstract
A low cost fiber-optic micro-cavity interferometric sensor is presented. The micro-cavity is fabricated at the fiber tip by splicing a silica capillary to a single mode fiber and then heating/melting the capillary to form a microsphere with an internal air cavity. Applications of the micro-cavity sensor for temperature and traverse load measurements are demonstrated. The sensor has small size and good mechanical strength, and may be used in high temperature environment.
Highlights
Optical fiber Fabry-Perot interferometers (FPIs) have been widely used for sensing temperature, strain, pressure, and etc [1,2,3,4,5,6,7,8]
We demonstrate a low cost fiber-tip FPI-like micro-cavity sensor for high temperature and transverse-load measurement
For the reflected waves associated with the internal air-cavity, the thermally induced refractive index change of air may be negligible [3] and the thermal expansion of the cavity length would play a main role in the temperature sensitivity
Summary
Optical fiber Fabry-Perot interferometers (FPIs) have been widely used for sensing temperature, strain, pressure, and etc [1,2,3,4,5,6,7,8]. FPIs were fabricated by ablating a groove in a SMF by use of a femtosecond laser, and were studied for strain [6] and refractive index measurement [7]. The aforementioned methods for FPI fabrication need stringent alignment between the two fibers inserting into the tube, careful cleaving, and/or the use of expensive lasers. We demonstrate a low cost fiber-tip FPI-like micro-cavity sensor for high temperature and transverse-load measurement. This sensor is fabricated by splicing a silica capillary to a SMF and fusing (heating/melting) the capillary to form a microsphere with an internal air-cavity.
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