52results about How to "Address cross-sensitivity issues" patented technology

The invention discloses a side surface polished open-loop PCF-SPR sensor. The side surface polished open-loop PCF-SPR sensor comprises a fiber core and a cladding covered outside the fiber core, wherein the fiber core is eccentric with the cladding, and the cladding is provided with air holes which are arranged in the axial direction of the fiber core; the air holes comprises a first air hole, a plurality of second air holes and a plurality of third air holes, the first air hole is arranged at the center of the cross section of the optical fiber, the second air holes surround the first air hole to form an annular N-angle structure with a layer number of K, and the third air holes are symmetrically arranged on two sides of the fiber core to substitute the positions of second air holes; theside surface of an optical fiber is provided with a polishing plane, and the polishing plane is provided with an open loop; and the open loop is covered with a sensing membrane, and the open ring is used as a sensing channel. By adopting a way of combining the side surface polished optical-fiber end surface and the open loop, the SPR sensing layer is most closest to the fiber core, so that substances with a refractive index less than 1.3 such as liquid oxygen, liquid CO2, fluorine-containing organic matters can be detected sensitively at a high amplitude or high wavelength and can be sensed byvirtue of multiple channels, so that the application range of the existing PCF-SPR sensor can be enlarged.

The invention discloses a multi-parameter identification system and method of a tapered fiber, belongs to the field of fiber sensors, and mainly aims at solving the technical problems that a fiber sensor manufacturing technology is complex and the measuring accuracy is hard to ensure at present. The multi-parameter identification system comprises a signal collection system, a data preprocessing system and a data processing system; the data processing system comprises an output processing unit which includes a SVR (Support Vector Regression) model; and data is collected by the signal collection system, the collected data is processed by the data preprocessing system to form sample data, and the data processing system uses the sample data and a relation model, established by a support vector machine, between input and output, inputs a measured quantity to be measured to the model, and obtains a required output value. According to the invention, variation of the resonant wavelength between two different loss peaks of the tapered fiber is detected to measure temperature and strain of the same tapered fiber at the same time, the operation steps of detection is fewer, and the cost is reduced.