The invention provides an unpolarized interference high-sensitivity
photonic crystal fiber temperature sensor which comprises a small section of
photonic crystal fiber and single mode fibers which are connected, wherein the
photonic crystal fiber is arranged in the middle section and filled with high thermo-
optical coefficient liquid, the single mode fibers are arranged at two ends and the high thermo-
optical coefficient liquid does not contact with the outside directly; the used
photonic crystal fiber comprises a
solid core and an air cladding, the high thermo-
optical coefficient liquid is sealed in the air cladding of the
photonic crystal fiber and has a length between several millimeters and dozens of millimeters. According to the manufacturing method of the unpolarized interference high-sensitivity
photonic crystal fiber temperature sensor, common single mode fibers are used for input / output
light guide of the fiber temperature sensor, a small section of photonic
crystal fiber filled with the high thermo-optical coefficient liquid is welded between the single mode fibers by adopting an
arc welding method, the high thermo-optical coefficient liquid is sealed in the photonic
crystal fiber and does not contact with the outside. The unpolarized interference high-sensitivity photonic
crystal fiber temperature sensor has novel design, is feasible to manufacture, and has a wide application prospect in the fields such as fiber sensing and the like. At present,
temperature sensitivity obtained by using isopropanol is 103.7pm / DEG C.