Double long period fiber grating (LPFG) temperature and humidity sensor

A temperature and humidity sensor, fiber grating technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve problems such as restricting the practical application of long-period fiber grating humidity sensors, and improve reliability and safety. high precision effect

Inactive Publication Date: 2012-08-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of cross-sensitivity between long-period fiber grating humidity sensors and temperature in pract

Method used

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  • Double long period fiber grating (LPFG) temperature and humidity sensor
  • Double long period fiber grating (LPFG) temperature and humidity sensor
  • Double long period fiber grating (LPFG) temperature and humidity sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Depend on Figure 1~3 It can be seen that the double long-period fiber grating temperature and humidity sensor of the present invention is composed of a sensing body 1, a supporting straight beam 2, a metal sleeve 3, a moisture-sensitive long-period fiber grating 4, a temperature-sensitizing straight beam 5, and a temperature-sensitive long-period The optical fiber grating 6 and the humidity-sensitizing film 7 are connected to form.

[0021] Among them: there are two sensing bodies, both of which are made of stainless steel. There is one temperature-increasing straight beam 5 and three supporting straight beams 2 fixedly connected between the sensing bodies 1 with threaded fastening connectors, and two supporting straight beams 2, temperature-increasing straight beam 5 and supporting straight beams can also be installed on the connection. Beam 2 is symmetrical lamellar structure, and the width of temperature-increasing straight beam 5 and support straight beam 2 is 0.5...

Embodiment 2

[0029]In this embodiment, one temperature-sensitizing straight beam 5 and three supporting straight beams 2 are fixedly connected axially between the two sensing bodies 1 with threaded fastening connectors, and are evenly distributed on the periphery of the sensing body 1 In the axial direction, the width of each straight beam is 0.5cm, the length is 7cm, and the thickness is 0.5mm, in a strip structure. A temperature-sensitive long-period fiber grating 6 is bonded to the temperature-sensitizing straight beam 5 with 383 glue, and the wavelength of the temperature-sensitive long-period fiber grating 6 is 1535-1555 nm. The center of the sensor body 1 is processed with a center hole, and the metal sleeve 3 is penetrated into the center hole, and the two ends of the metal sleeve 3 are bonded in the center of the two sensor bodies 1 with 502 glue, and the humidity-sensitive type has a long cycle time. Both ends of the fiber grating 4 are bonded to the inner surface of the metal sle...

Embodiment 3

[0031] In this embodiment, one temperature-sensitizing straight beam 5 and three supporting straight beams 2 are fixedly connected axially between the two sensing bodies 1 with threaded fastening connectors, and are evenly distributed on the periphery of the sensing body 1 In the axial direction, each straight beam has a width of 0.5cm, a length of 7cm, and a thickness of 1mm, in a strip-like structure. A temperature-sensitive long-period fiber grating 6 is bonded to the temperature-sensitizing straight beam 5 with 383 glue, and the wavelength of the temperature-sensitive long-period fiber grating 6 is 1555nm? . The center of the sensor body 1 is processed with a center hole, and the metal sleeve 3 is penetrated into the center hole, and the two ends of the metal sleeve 3 are bonded in the center of the two sensor bodies 1 with 502 glue, and the humidity-sensitive long-period Both ends of the fiber grating 4 are bonded to the inner surface of the metal sleeve 3 with 383 glue....

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Abstract

Disclosed is a double LPFG temperature and humidity sensor. A temperature sensibilizing straight bar, a supporting straight bar and a metal casing are axially arranged between two sensing bodies, wherein a temperature sensitive LPFG is arranged on the temperature sensibilizing straight bar, a humidity sensitive LPFG is arranged in the metal casing, and tail fibers of the temperature sensitive LPFG and the humidity sensitive LPFG are welded together. When temperature and humidity in the external environment change, effective refractive indexes of a fundamental core mode and a cladding mode of the LPFG, grating period, resonant wavelength and refractive index change, then information of the temperature and the humidity of the environment can be obtained through detection of transmission wavelengths of the temperature sensitive LPFG and the humidity sensitive LPFG, and double parameters can be measured simultaneously. The double LPFG temperature and humidity sensor has the advantages of high measurement accuracy, simultaneous measurement of the temperature and the humidity, and the like; and can be used as the sensor which can measure the temperature and the humidity simultaneously.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensors, in particular to an optical fiber grating temperature and humidity sensor capable of simultaneously measuring temperature and humidity. Background technique [0002] At present, the humidity sensors based on the principle of optical fiber sensing are mostly F-P cavity structure, FBG structure and optical fiber end surface coating structure. However, the inventor found in the process of research and development that: the manufacturing process of the F~P cavity type humidity sensor and the optical fiber end face coating type humidity sensor is complicated, and the degree of practicality is low. Although the FBG type humidity sensor has good stability, its sensitivity is not high. high. Therefore, it is difficult to meet the requirements of applications. [0003] For the long-period fiber grating, it is a transmission fiber grating without retroreflection. Compared with the t...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01N21/41G01K11/3206
Inventor 乔学光邵敏傅海威冯德全冯忠耀忽满利
Owner NORTHWEST UNIV
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