34results about How to "High refractive index sensitivity" patented technology

The invention relates to the technical field of optical fiber sensing, in particular to a two-parameter measurement optical fiber sensor and a manufacturing method thereof. The two-parameter measurement optical fiber sensor comprises an optical fiber and a sensing unit arranged at one end of the optical fiber. The sensing unit is formed by sequentially arranging a Bragg reflector and a noble metal nano-film, the noble metal nano-film is provided with nano-structure units arranged in an array, and the sensing unit can excite two resonant modes, so that the refractive index variation and the temperature variation of an external medium initiate resonant wavelength movement of the two resonant modes, and the refractive index variation and the temperature variation of the external medium are changed. And simultaneous measurement of the refractive index and the temperature of an external medium is realized. By improving the metal nano-film, two resonance modes are excited, the detection sensitivity is improved, meanwhile, the machining difficulty can be simplified, the structural stability can be improved, and accurate decoupling measurement of the refractive index and the temperature is achieved.