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Ultra-wide-range fiber Bragg grating temperature sensor

An optical fiber Bragg, temperature sensor technology, applied in thermometers, thermometers, instruments and other directions with physical/chemical changes, can solve the problems of difficult high temperature sensing, low mechanical strength, insufficient stability, etc., to enhance mechanical strength and facilitate production. , the effect of simple structure

Inactive Publication Date: 2017-10-17
BEIHANG UNIV
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Problems solved by technology

However, the manufacturing process of type II grating written by femtosecond laser is complicated, and the writing requirements are high, so it is difficult to mass produce
Although regenerative grating can realize high temperature measurement, but its stability is not enough
In addition, the grating has low mechanical strength after regeneration, making it difficult to perform high-temperature sensing in complex environments
In summary, there is no practically available ultra-wide range grating temperature sensor

Method used

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  • Ultra-wide-range fiber Bragg grating temperature sensor
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  • Ultra-wide-range fiber Bragg grating temperature sensor

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Embodiment Construction

[0031] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] figure 1 Show the manufacturing process of a kind of ultra-wide range fiber Bragg grating temperature sensor of the present invention, specifically comprise the following steps:

[0033] 1) Writing a seed grating on a gold-coated fiber using a UV laser and a phase mask.

[0034] 2) Refer to attached figure 2 As shown, a high-temperature ceramic capillary inner tube 13 with an inner diameter slightly larger than the outer diameter of the optical fiber by 2-3 microns, an outer diameter of 1 mm, and a length of 100 mm and a stainless steel outer tube 14 with an inner diameter of 1 mm, an outer diameter of 2 mm, and a length of 100 mm are passed through the process. The composite capillary is assembled into a composite capillary, one end of the stainless steel tube is sintered and sealed, and then the engraved Bragg grating 12 is inserted...

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Abstract

The invention discloses an ultra-wide-range fiber Bragg grating temperature sensor. The sensor manufacturing method includes inscribing a Bragg grating on a gold coated fiber and packaging the Bragg grating into a composite capillary formed by the sleeving of a stainless steel tube and a high temperature ceramic capillary, and fixing via laser welding; calculating and preferably selecting the appropriate regeneration temperature based on the regeneration model of the fiber grating, setting the temperature of a high-temperature furnace to the design temperature, inserting the sensor with the grating into the high-temperature furnace for high-temperature annealing, increasing the temperature to 1200 DEG C for high-temperature processing after the annealing is completed, namely, obtaining the ultra-wide-range fiber Bragg grating temperature sensor. The upper limit of the temperature measurement range of the manufactured fiber Bragg grating temperature sensor is 1200 DEG C, and the lower limit is lower than -196 DEG C. The sensor provided is high in precision, small in size, light in weight, and simple in manufacturing.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensors, in particular to an ultra-wide range optical fiber Bragg grating temperature sensor. Background technique [0002] The fiber grating sensor has the advantages of small size, light weight, anti-electromagnetic interference, anti-radiation, corrosion resistance, fire prevention, explosion protection, long life, etc., and has the characteristics of high precision, real-time precise positioning and quasi-distribution measurement when measuring temperature. , has attracted the attention of a large number of researchers, and has been widely used in various temperature measurement fields. [0003] The above-mentioned advantages of fiber grating sensors are very suitable for the application requirements in the fields of petrochemical industry, power monitoring and aerospace, and have strong competitiveness. However, most of the applications in these fields need to measure a large t...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/3206
Inventor 杨远洪郑胜亨陆林杨福铃傅伟纯
Owner BEIHANG UNIV
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