Anti-resonance optical fiber temperature detector

An optical fiber temperature and anti-resonance technology, used in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of long response time, limited measurement position accuracy, and low temperature measurement accuracy, and achieve high temperature sensitivity and transmission. The effect of low latency and short response time
CN112284565AActive Publication Date: 2021-01-29SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2021-01-29

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Abstract

The invention discloses an anti-resonance optical fiber temperature detector which comprises an anti-resonance optical fiber. One end of the anti-resonance optical fiber is connected with a beam expanding optical fiber, and the other end of the anti-resonance optical fiber is connected with a coupling optical fiber; one end of the beam expanding optical fiber is connected with the anti-resonance optical fiber, and the other end is connected with an uplink transmission optical fiber; one end of the uplink transmission optical fiber is connected with the beam expanding optical fiber, and the other end of the uplink transmission optical fiber is connected with an optical fiber light source; one end of the coupling optical fiber is connected with the anti-resonance optical fiber, and the otherend is connected with a downlink transmission optical fiber; and one end of the downlink transmission optical fiber is connected with the coupling optical fiber, and the other end is connected with an optical fiber spectrometer. Due to a fact that a silicon dioxide material is sensitive to a temperature, the temperature influences an optical path difference of the coherent light beams, and interference fringes read out by the optical fiber spectrometer change along with the temperature change of the anti-resonance optical fiber. By monitoring the movement of the fringes, the high-precision temperature monitoring of the anti-resonance optical fiber can be realized. Benefited from optimized device parameters and relatively high interference series, an anti-resonance optical fiber temperature detector has relatively high temperature detection sensitivity.
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Description

technical field

[0001] The invention relates to the technical field of photodetection devices, in particular to an anti-resonance optical fiber temperature detector. Background technique

[0002] Currently commercial fiber optic temperature detectors include distributed fiber optic temperature sensors, interferometric fiber optic temperature sensors, and fiber optic Bragg grating temperature sensors. The distributed optical fiber temperature sensor uses OTDR technology to detect Raman scattered light and realize continuous and real-time temperature measurement in a large spatial range. Due to the weak Raman reflected light signal, it usually takes a long response time, and it is difficult to detect the precise position of temperature change, and the temperature detection accuracy is low; interferometric fiber optic temperature sensors include MZI type and F-P type temperature sensors. Although the sensing accuracy is high, the structure of the sensing element is complex. Th...

Claims

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