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Ultra-weak fiber grating optical cable used for water temperature monitoring

A technology of weak fiber gratings and fiber grating arrays, applied in the field of ultra-weak fiber grating optical cables, can solve the problems of complex structure, poor waterproofness, and low temperature measurement accuracy of temperature-sensing optical cables, and achieve good application prospects, good waterproofness, and suppression of accumulation distribution effect

Pending Publication Date: 2019-12-31
宜昌睿传光电技术有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problems of complex structure, low temperature measurement accuracy and poor waterproof performance of the existing temperature-sensing optical cable

Method used

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  • Ultra-weak fiber grating optical cable used for water temperature monitoring
  • Ultra-weak fiber grating optical cable used for water temperature monitoring
  • Ultra-weak fiber grating optical cable used for water temperature monitoring

Examples

Experimental program
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Effect test

Embodiment Construction

[0039] An ultra-weak fiber grating optical cable applied to water temperature monitoring, including:

[0040] The ultra-weak fiber grating array 1 in the center;

[0041] A small amount of grease layer 2 uniformly covering the ultra-weak fiber grating array 1 along the axial direction;

[0042] Wrap the metal tube 3 surrounding the ultra-weak fiber grating array 1, the ointment layer 2;

[0043] A reinforcing member 4 that is twisted around the metal tube 3 in a spiral form;

[0044] The sensor mark 5 is coated on the outside of the reinforcement 4.

[0045] The ultra-weak fiber grating array 1 includes a low elastic modulus single-layer coating 8 with a thickness of less than 30 um, preferably modified acrylate, and no obvious glass transition temperature at -25°C to 100°C. Traditional fiber grating adopts double-layer coating. The temperature nonlinearity of the coating material affects the temperature-sensing characteristics of the grating. The single-layer coating layer 8 with low e...

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Abstract

An ultra-weak fiber grating optical cable used for water temperature monitoring comprises an ultra-weak fiber grating array located at the center; an grease layer uniformly covering the ultra-weak fiber grating array in the axial direction; a metal tube wrapping the periphery of the ultra-weak fiber grating array and the grease layer; a reinforcing member for twisting surrounding in a spiral formaround the metal tube; and a sensor mark coated on the outside of the reinforcing member. The grating optical cable uses the metal tube to directly encapsulate the ultra-weak fiber grating array. By filling a small amount of grease along the grating array, the cumulative distribution of the remaining length of the fiber is suppressed, and the impact of the residual strain in the sensing fiber is reduced or eliminated while preventing water vapor from infiltrating the fiber. The ultra-weak fiber grating temperature-sensing optical cable manufactured by the method has a linear correlation of thecalibrated temperature curve of more than 0.999 and a temperature sensitivity fluctuation of less than 0.3pm / DEG C.

Description

Technical field [0001] The invention relates to the field of optical fiber and optical cable temperature sensing, in particular to an ultra-weak optical fiber grating optical cable used for water temperature monitoring. Background technique [0002] Water temperature is an important parameter for the characterization of water environment. Monitoring the change of water temperature and its gradient distribution has important guiding significance for water conservancy scheduling, environmental protection, aquatic fishing, waterway maintenance, and site selection of hydraulic constructions. Optical fiber sensors have significant advantages such as no self-heating, anti-electromagnetic interference, high sensitivity, light weight and flexibility, multi-parameter composite sensing, and large-space distributed measurement. They have broad application prospects in the field of water temperature monitoring. [0003] At present, the optical fiber sensing technologies used in water temperat...

Claims

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Application Information

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IPC IPC(8): G02B6/44G01K11/32G01K11/3206
CPCG02B6/4429G02B6/4432G01K11/32G02B6/44384
Inventor 罗志会张宇程文胜曾曙光谭超郑胜
Owner 宜昌睿传光电技术有限公司
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