Optical fiber fading wave temperature sensor of network structure

Abstract

A temperature transducer of optical fiber fade-down wave in networked structure consists of optical source, 1xN optical fiber coupler, detector, signal processing unit and multiple temperature sensor of optical fiber fade-down wave. It is featured as applying pyromatric cone sensing 1x2 optical fiber coupling component as temperature sensor, using comb structure as connection mode for making measurement on multipoint-temperature.

Description

Technical field: [0001] The invention relates to an optical fiber evanescent wave temperature sensor with a network structure, which belongs to the technical field of optical fibers and sensors. Background technique: [0002] Temperature is one of the three most important measurement parameters (stress, temperature, pressure / acoustics). In the fiber optic sensor family, the measured parameter distribution is approximately: stress accounts for 23%, temperature accounts for 17.2%, and pressure / acoustic accounts for 15.2%. The annual temperature sensors and systems required in the world are about tens of billions of dollars, of which fiber optic temperature sensors account for about 9%. According to the forecast of Frost Sullivan Company in the United States, fiber optic sensors will grow at a rate of 17% to 20% in the next few years. Optical fiber temperature sensor, it is not only used for normal temperature measurement, more importantly, it can be used in some special or h...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many kinds of fiber optic temperature sensors, and the technical development status at home and abroad is mainly manifested in the following aspects: semiconductor absorption type; distributed Raman scattering; Fabry-Perot interference type; birefringence effect type; fiber Bragg grating Although some of these sensors have been applied, they need to be further improved and perfected in terms of sensitivity, resolution, practicability, cost, etc. For example, semiconductor absorption type, resolution and stability need to be further improved; Raman scattering type, The detected signal is weak, requiring high-cost light sources, detectors and high-performance signal processing units; the Fabry-Perot interference method, the environmental impact is a link that needs to be improved; the birefringence effect method, the practicability needs further research ; Fiber Bragg grating type, wavelength demodulation has the problems of complex structure and high cost

Therefore, this is looking forward to the emergence of new fiber optic temperature sensors and networked sensing technology, so that there will be new improvements in performance and stability, and a large reduction in cost

Images