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High-precision Fiber Bragg Grating Temperature Sensing System

A fiber grating, sensing system technology, applied in thermometers, thermometers with physical/chemical changes, measuring devices, etc. Linearity difference and other problems, to achieve the effect of eliminating frequency error, demodulating high-precision frequency information, and improving temperature sensing resolution

Active Publication Date: 2017-07-18
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the patent document CN102252704A adopts the method of table lookup and fitting to correct the frequency sweep nonlinearity. Although the problem of sweep frequency nonlinearity can be alleviated to a certain extent, because the data that lookup table and fitting rely on are based on measurement The information pre-acquired before cannot compensate the actual nonlinear difference at the measurement time, so it cannot completely eliminate the influence of sweep nonlinearity on the temperature measurement accuracy

Method used

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  • High-precision Fiber Bragg Grating Temperature Sensing System
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  • High-precision Fiber Bragg Grating Temperature Sensing System

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Embodiment 1

[0037] Such as figure 1 As shown, this embodiment includes: a light source 1, a fiber coupler array, a fiber grating 5, a fiber resonator 6, a standard gas absorption chamber 7, a photodetector array 8, and a calculation control unit, wherein:

[0038] The calculation and control unit, the light source 1 and the fiber coupler array are sequentially connected in series, and four parallel branches are formed between the four output ends of the fiber coupler array and the four input ends of the photodetector array 8, respectively:

[0039] 1. The first output end of the fiber coupler array is directly connected to the first input end of the photodetector array 8;

[0040] ② The two ends of the fiber grating 5 are respectively connected to the second output end of the fiber coupler array and the second input end of the photodetector array 8;

[0041] ③ The two ends of the fiber resonator 6 are respectively connected to the third output end of the fiber coupler array and the third...

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Abstract

A high-precision fiber grating temperature sensing system, including: light source, fiber coupler array, fiber grating, fiber resonator, standard gas absorption chamber, photodetector array and calculation control unit, wherein: calculation control unit, light source, optical fiber The coupler arrays are sequentially connected in series, four parallel branches are formed between the four output ends of the fiber coupler array and the four input ends of the photodetector array, and the output ends of the photodetector array are respectively connected with the calculation control unit. Compared with the general fiber grating temperature sensor, this system has higher temperature resolution index, and has better temperature accuracy and long-term stability.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber grating temperature sensing system with a precision of 0.0004K. Background technique [0002] Fiber Bragg grating sensing technology is one of the important branches of fiber optic sensing technology. Due to its advantages of high measurement accuracy, easy multi-point measurement, anti-electromagnetic interference, small size, and low cost, it has been widely used in various practical scenarios. [0003] Geophysics-related research is one of the important application scenarios of fiber grating sensing systems, such as geological structure research, data acquisition of crustal micro-change process, detection and early warning of geological disasters such as earthquakes and volcanoes, global climate change, "El Nino" effect, etc. Ocean science temperature measurement in research, etc. The salient features of the physical fields to be measured in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
Inventor 何祖源刘庆文樊昕昱杜江兵马麟陈嘉庚
Owner SHANGHAI JIAOTONG UNIV
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