A fiber-optic twist sensor based on a pressure-induced birefringence singlemode fiber loop mirror is proposed. The
birefringer SMF is made by applying a transverse force against a short length of singlemode fiber. The sensitivity of the
twist angle measurement of 0.19 nm/o is achieved experimentally. The proposed sensor is more convenient and simple than that of standard polarization-maintaining fibers.
A relative humidity sensor based on polarization maintaining fiber (PMF) loop mirror is presented. The proposed sensors
are created through coating a thin layer of polyvinyl alcohol (PVA), whose refractive index varies as a function of
humidity level, onto a polarization maintaining fiber, from which a portion of the cladding is removed. The relative
humidity optical fiber sensor is tested with different surrounding humidity level, showing a linear response to parameter.
The sensitivity of the relative humidity measurement of 0.98 nm/%RH in the range from 20%-80% RH is experimentally achieved.
An optical fiber curvature sensor is fabricated by using a short section of polarization maintaining fiber (PMF) as the
sensing component spliced in an optical fiber Sagnac loop. The length of the sensing element for the curvature sensing is
about 142 mm. The sensitivity of the curvature measurement of 0.0344 m-1/pm is achieved experimentally. The propose
sensor is more convenient and simply than that of photonic crystal fiber (PCF).
A fiber-optic temperature sensor based on a pressure-induced birefringence singlemode fiber (SMF) loop mirror is
developed. The pressure-induced birefringence singlemode fiber is made by applying a force against a short section of
length of a singlemode fiber. The length of the sensing element for the temperature sensing is about 50 mm. Wavelength
spacing between the two adjacent interference minima of the loop mirror can be tuned by varying the applied pressure.
The sensitivity of the temperature measurement of 0.65 nm/oC is achieved experimentally. The proposed sensor is more
convenient and simple than that of polarization-maintaining photonic crystal fiber (PM-PCF) or standard polarizationmaintaining
fibers (PMF).
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