CN202372278U - Optical fiber grating temperature sensor - Google Patents
Optical fiber grating temperature sensor Download PDFInfo
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- CN202372278U CN202372278U CN2011204718304U CN201120471830U CN202372278U CN 202372278 U CN202372278 U CN 202372278U CN 2011204718304 U CN2011204718304 U CN 2011204718304U CN 201120471830 U CN201120471830 U CN 201120471830U CN 202372278 U CN202372278 U CN 202372278U
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- optical fiber
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Abstract
The utility model belongs to the technical field of sensors, and relates to an optical fiber grating temperature sensor. The sensor comprises a low-expansion alloy substrate, a stainless substrate, an optical fiber grating, a substrate welding stage and a stainless steel substrate welding stage; the low-expansion alloy substrate is arranged below the stainless steel substrate; the right end surfaces of the two substrates are in alignment and are fixed together; V-shaped grooves are arranged in the centers of the substrate welding stage and the stainless steel substrate welding stage; and both ends of the optical fiber grating are respectively arranged at the roots of the V-shaped grooves in the centers of the substrate welding stage and the stainless steel substrate welding stage along an axial direction. According to the optical fiber grating temperature sensor, metal with low thermal expansion coefficient serves as a lower substrate, metal with high thermal expansion coefficient serves as an upper substrate, the optical fiber grating is arranged between the two substrates, the measurement of the optical fiber grating on low temperature is realized by effectively structurally designing and effective structuring the two substrates with thermal expansion coefficients in great contrast, the low-temperature measurement interval is expanded to 100DEG C below zero, and the high sensitivity being no lower than 30pm/DEG C and resolution being higher than 0.03DEG C are ensured.
Description
Technical field
The utility model belongs to sensor technical field, relates to a kind of fiber-optical grating temperature sensor.
Background technology
Write technology through ultraviolet, the phase mask wrting method makes the refractive index of a certain section of optical fiber be periodic variation, and the reformed optical fiber of this section refractive index is called fiber grating.When physical parameters such as the temperature of fiber grating environment of living in, pressure, strain, vibration change, can cause through fiber grating or by the optical wavelength of fiber grating reflection to change.Because fiber grating possesses sensitivity characteristics to multiple physical parameters such as temperature, pressure, strain, vibrations, fiber grating can be used as the sensor of measuring these physical parameters.According to concrete measurement requirement, fiber grating can be developed to various sensors such as temperature, pressure, strain or vibration through different packing forms.
Present fiber grating mainly with certain single metal as substrate.Be difficult to realize the measurement of lower temperature with single metal as the fiber-optical grating temperature sensor of substrate, and its sensitivity is not high, temperature resolution is limited.
Summary of the invention
The purpose of the utility model is to propose a kind of highly sensitive, fiber-optical grating temperature sensor that temperature resolution is good.The technical scheme of the utility model is: sensor comprises: low-expansion alloy substrate, the stainless steel-based end, fiber grating; The substrate welding stage; Stainless steel-based back welding platform, the low-expansion alloy substrate places the below at the stainless steel-based end, and the alignment of two substrate right sides also is fixed together; The V-type groove is opened at the center of substrate welding stage and stainless steel-based back welding platform, and the fiber grating two ends are placed on the V-type groove root at substrate welding stage and stainless steel-based back welding platform center vertically respectively.
The length at the described stainless steel-based end and fiber grating length sum equal the length of low heat expansion alloy substrate.
The utlity model has advantage and beneficial effect is: as substrate down, the high thermal expansion coefficient metal is as last substrate, and with the alignment of one of which end, the alignment end face is connected together through laser or argon arc welding with the low thermal coefficient of expansion metal for the utility model.Low thermal coefficient of expansion metallic substrates and high thermal expansion coefficient metallic substrates length equal fiber grating length, fiber grating is placed between two substrates, the grating two ends are separately fixed in two substrates.The utility model carries out effective structural design and effectively constructs through two kinds of substrates that the thermal expansivity contrast is very big, has realized the measurement of fiber grating to low temperature, and the low-temperature measurement interval expands to-100 ℃.And guarantee to be not less than 30pm/ ℃ high sensitivity and be higher than 0.03 ℃ resolution.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
As shown in Figure 1, sensor comprises: low-expansion alloy substrate 1, the stainless steel-based end 2; Fiber grating 3, substrate welding stage 4, stainless steel-based back welding platform 5; Low-expansion alloy substrate 1 places the below at the stainless steel-based end 2; The alignment of two substrate right sides also is fixed together, and the V-type groove is opened at the center of substrate welding stage 4 and stainless steel-based back welding platform 5, and fiber grating 3 two ends are placed on the V-type groove root at substrate welding stage 4 and stainless steel-based back welding platform 5 centers vertically respectively.
The sensor of the embodiment of the utility model mainly comprises low-expansion alloy 4J36 substrate 1, stainless steel 1Cr18Ni9Ti substrate 2, and fiber grating 3,4J36 substrate welding stage 4, stainless steel 1Cr18Ni9Ti substrate welding stage 5, the V-type groove is opened at the welding stage center.
By shown in Fig. 1 substrate 1 being placed the below, substrate 2 places the top during assembling, with two substrate right sides alignment, adopts the laser bonding mode that substrate 1, substrate 26 are weldingly fixed on together along the slit.Before assembly sensor, substrate 1 is carried out the zinc-plated processing of copper facing with substrate 2 surfaces, and fiber grating carries out metalized.The fiber grating two ends are placed on the V-type groove root at welding stage 4 and welding stage 5 centers vertically respectively, and fiber grating is carried out prestretched, with its centre wavelength modulation 1nm.At last the grating two ends are welded on respectively in the V-type groove at welding stage 4,5 centers.And then do suitable outer enclosure and promptly can be made into the high-sensitivity optical fibre grating temperature sensor that is fit to low-temperature measurement.
Claims (2)
1. a fiber-optical grating temperature sensor is characterized in that sensor comprises: low-expansion alloy substrate (1); The stainless steel-based end (2); Fiber grating (3), substrate welding stage (4), stainless steel-based back welding platform (5); Low-expansion alloy substrate (1) places the below of the stainless steel-based end (2); The alignment of two substrate right sides also is fixed together, and the V-type groove is opened at the center of substrate welding stage (4) and stainless steel-based back welding platform (5), and fiber grating (3) two ends are placed on the V-type groove root at substrate welding stage (4) and stainless steel-based back welding platform (5) center vertically respectively.
2. a kind of fiber-optical grating temperature sensor according to claim 1 is characterized in that: the length of the stainless steel-based end (2) and fiber grating (3) length sum equal the length of low heat expansion alloy substrate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204718304U CN202372278U (en) | 2011-11-18 | 2011-11-18 | Optical fiber grating temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204718304U CN202372278U (en) | 2011-11-18 | 2011-11-18 | Optical fiber grating temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202372278U true CN202372278U (en) | 2012-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204718304U Expired - Fee Related CN202372278U (en) | 2011-11-18 | 2011-11-18 | Optical fiber grating temperature sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202372278U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076109A (en) * | 2012-12-26 | 2013-05-01 | 武汉理工大学 | Magnetic type flaky optical fiber grating temperature sensor |
| CN105403324A (en) * | 2015-10-30 | 2016-03-16 | 武汉理工大学 | Packaging device of fiber bragg grating temperature sensor |
| CN109900304A (en) * | 2019-03-29 | 2019-06-18 | 蚌埠学院 | A kind of V-shaped slot presser type fiber grating |
-
2011
- 2011-11-18 CN CN2011204718304U patent/CN202372278U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076109A (en) * | 2012-12-26 | 2013-05-01 | 武汉理工大学 | Magnetic type flaky optical fiber grating temperature sensor |
| CN103076109B (en) * | 2012-12-26 | 2015-04-08 | 武汉理工大学 | Magnetic type flaky optical fiber grating temperature sensor |
| CN105403324A (en) * | 2015-10-30 | 2016-03-16 | 武汉理工大学 | Packaging device of fiber bragg grating temperature sensor |
| CN109900304A (en) * | 2019-03-29 | 2019-06-18 | 蚌埠学院 | A kind of V-shaped slot presser type fiber grating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20161118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |