Fiber temperature sensor and measuring system thereof and signal processing method of system
A fiber optic temperature and measurement system technology, applied to thermometers, heat measurement, and measurement devices, can solve problems such as measurement temperature defects, improve measurement sensitivity, and eliminate errors
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[0046] After filling the pores of the photonic crystal fiber with rhodamine B as a fluorescent substance and an ethanol solution as a refractive index temperature sensitive material, the temperature-dependent characteristics of the excitation light and fluorescence in the fiber are detected. The refractive index temperature coefficient of ethanol is 3.94×10 -4 / K, relative to pure silicon refractive index temperature coefficient 8.6×10 -6 / K is about two orders of magnitude higher. The ratio of the fluorescent material Rhodamine B and the refractive index temperature sensitive material alcohol is 1:5. Too much rhodamine B will saturate the fluorescence, and too little rhodamine B will result in a weak fluorescence signal, which brings difficulties to the detector.
[0047] The photonic crystal fiber selects a photonic band gap fiber with a core hole diameter of 5.6 μm, a cladding air hole diameter of 2.2 μm, and a duty ratio of about 85%. After the air hole is fi...
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