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Magnetic type flaky optical fiber grating temperature sensor

A temperature sensor, fiber grating technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve problems such as low sensitivity, and achieve the effects of high sensitivity, small size and simple structure

Active Publication Date: 2015-04-08
HUBEI KAIJIA ELECTRICAL TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent No. 201110308013.1 "A Corrosion-Resistant Fiber Bragg Grating Temperature Sensor" adopts a steel pipe with a corrosion-resistant layer on the outer surface to directly encapsulate the fiber Bragg grating. The temperature sensor has a simple structure and good corrosion resistance, but is susceptible to The influence of external stress, the sensitivity is low

Method used

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  • Magnetic type flaky optical fiber grating temperature sensor
  • Magnetic type flaky optical fiber grating temperature sensor
  • Magnetic type flaky optical fiber grating temperature sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: the structure of the present invention is as figure 1 As shown, it includes a base 4 , a fiber grating 5 , a cover 7 , a permanent magnet 8 , an adhesive 9 , a cavity 6 , a fiber protection sleeve 2 and a thin steel pipe 3 . The sensor has a sheet structure and is suitable for measuring the surface temperature of objects. Wherein: the fiber Bragg grating 5 is pasted and fixed on the substrate 4 through an adhesive 9 , and the fiber Bragg grating 5 is temperature-sensitized by using the relatively high thermal expansion coefficient of the substrate 4 . Two permanent magnets 8 are installed and fixed on the base 4 symmetrically at both ends, and the sensor is adsorbed on the surface of the measured object by using the permanent magnets. A cavity 6 is formed between the cover 7 and the base 4 , which can reduce the influence of the ambient temperature on the wavelength of the fiber grating 5 . The thin steel pipe 3 is fixed on both ends of the base 4, the f...

Embodiment 2

[0031] Embodiment 2: as figure 2 As shown, the difference between embodiment 2 and embodiment 1 is that the permanent magnets in embodiment 2 are symmetrically installed and fixed on both sides of the middle of the sensor.

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Abstract

The invention relates to a magnetic type flaky optical fiber grating temperature sensor which comprises an optical fiber grating, fine steel tubes and fiber protection sleeves; signal transmission optical fibers on both ends of the optical fiber grating are sleeved into the fiber protection sleeves; the fiber protection sleeves are fixedly adhered in the fine steel tubes; the sensor is characterized by also comprising a substrate; the optical fiber grating is fixedly adhered onto the substrate through adhesive; and the fine steel tubes are fixedly arranged on both ends of the substrate. Compared with an existing temperature measuring and monitoring sensor, the magnetic type flaky optical fiber grating temperature sensor has the significant characteristics that the installation is carried out in a magnetic suction way, so that the installation is convenient and quick, the measuring position is easily changed, and a flaky structure is more suitable for measuring the surface temperature of an object; temperature sensitization is carried out on the optical fiber grating through the substrate material with high thermal expansion coefficient, so that the sensitivity of the sensor is high and the response speed is high; and the structure is simple, the size is small, the impact of external stress is small, the serial connection is convenient, and the multi-point distributed measurement and the remote on-line monitoring of temperature are easily realized.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a magnetic suction type sheet fiber grating temperature sensor. Background technique [0002] Fiber Bragg Grating has a series of advantages such as small size, light weight, intrinsic safety, anti-electromagnetic interference, corrosion resistance, long life, and easy reuse. It has become one of the most rapidly developing fiber optic passive devices in recent years. Much favored. Fiber Bragg grating sensors can realize multi-point distributed measurement and long-term remote online monitoring of multiple physical quantities and parameters such as temperature, strain, pressure, vibration, displacement, and current, and have been widely researched and applied. [0003] At present, temperature sensors are widely used in experimental measurement and condition monitoring. Traditional electrical temperature sensors, such as thermal resistors and thermocouples, use met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
Inventor 周祖德黄俊谭跃刚刘明尧
Owner HUBEI KAIJIA ELECTRICAL TECH GROUP