CN201364167Y - Fiber grating sensor and system thereof - Google Patents
Fiber grating sensor and system thereof Download PDFInfo
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- CN201364167Y CN201364167Y CNU2009201295122U CN200920129512U CN201364167Y CN 201364167 Y CN201364167 Y CN 201364167Y CN U2009201295122 U CNU2009201295122 U CN U2009201295122U CN 200920129512 U CN200920129512 U CN 200920129512U CN 201364167 Y CN201364167 Y CN 201364167Y
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Abstract
The utility model belongs to the field of fiber grating and discloses a fiber grating sensor and a system thereof. The fiber grating sensor comprises a first sensing head and a second sensing head, wherein the first sensing head comprises a first optical fiber which is provided with a first Bragg grating and a second Bragg grating; the first Bragg grating is packaged by an insulating material; the second Bragg grating is provided with a piezoelectric ceramic chip and packaged by an insulating material; the second sensing head comprises a second optical fiber which is provided with a third Bragg grating and a fourth Bragg grating; the third Bragg grating is exposed in the air; and the fourth Bragg grating is provided with a piezoelectric ceramic chip which is attached with a current-voltage converter, and is packaged by an insulating material. The fiber grating sensor and the system thereof can measure the change of a plurality of physical parameters such as temperature, pressure, current and voltage by adopting different packaging structures.
Description
Technical field
The utility model belongs to the fiber grating field, particularly a kind of fiber-optic grating sensor and system thereof.
Background technology
Along with the development of optical communication technique, for the application in the sensory field provides technology gentle, fiber grating is exactly one of them to some technology in the optical communication gradually.There is great application prospect except the huge applications of optical communication field in fiber grating equally at sensory field, and fiber-optic grating sensor has been applied to the measurement of various physical quantitys at present, as temperature, strain, voltage, electric current, little vibration etc.
But current programme all is the single-measurement structure, promptly utilize a fiber grating can only measure single parameter-temperature, pressure, curtage, can't measure temperature, pressure, electric current and voltage parameter simultaneously, need independent temperature, pressure, electric current, voltage sensor to measure, thereby cause system complex, the shortcoming that volume is bigger.Therefore need develop and a kind ofly can carry out the simultaneously-measured sensor-based system of temperature, pressure, electric current and voltage.
The utility model content
Problem to be solved in the utility model is: the existing fiber grating sensor can only be measured the deficiency of single parameter, thereby a kind of fiber-optic grating sensor and the fiber grating sensing system that can measure the variation of temperature, pressure, electric current and the many physical parameters of voltage simultaneously is provided.
The purpose of this utility model is achieved in that a kind of fiber-optic grating sensor comprises first sensing head and second sensing head; Described first sensing head comprises first optical fiber, and described first optical fiber has first Bragg grating, second Bragg grating; Described first Bragg grating is encapsulated by thermal insulation material; Described second Bragg grating is provided with piezoelectric ceramic piece, and is encapsulated by thermal insulation material; Described second sensing head comprises second optical fiber, and described second optical fiber has the 3rd Bragg grating, the 4th Bragg grating; Described the 3rd Bragg grating exposes in air; Described the 4th Bragg grating is provided with the piezoelectric ceramic piece of applying current-to-voltage convertor, and is encapsulated by thermal insulation material.
The utility model also provides a kind of fiber grating sensing system, and this system comprises wideband light source, spectroanalysis instrument, coupling mechanism and fiber-optic grating sensor, and described fiber-optic grating sensor comprises first sensing head and second sensing head; Described first sensing head comprises first optical fiber, and described first optical fiber has first Bragg grating, second Bragg grating; Described first Bragg grating is encapsulated by thermal insulation material; Described second Bragg grating is provided with piezoelectric ceramic piece, and is encapsulated by thermal insulation material; Described second sensing head comprises second optical fiber, and described second optical fiber has the 3rd Bragg grating, the 4th Bragg grating; Described the 3rd Bragg grating exposes in air; Described the 4th Bragg grating is provided with the piezoelectric ceramic piece of applying current-to-voltage convertor, and is encapsulated by thermal insulation material.
Compared with prior art, fiber-optic grating sensor of the present utility model, adopt multiple different encapsulating structure: Bragg grating exposes in the air neutralization and by thermal insulation material Bragg grating is encapsulated, exposed airborne grating is because the temperature and pressure effect produces strain, its grid cycle changes, thereby the reflection wavelength of this part fiber grating changes; And by the Bragg grating of thermal insulation material encapsulation because the effect that only is under pressure, its grid also changes, but the reflection wavelength that this part grating changes with directly expose different, the variation that just can measure temperature and pressure by the difference of two reflection peaks of spectroanalysis instrument detection.In like manner, piezoelectric ceramic piece is set on Bragg grating, and by thermal insulation material encapsulation and the piezoelectric ceramic piece of applying current-to-voltage convertor is set on Bragg grating, and, detect the variation that the difference of two reflection peaks just can be measured voltage and current by spectroanalysis instrument by thermal insulation material encapsulation.Therefore the variation of adopting multiple different encapsulating structure can measure temperature, pressure, electric current and the many physical parameters of voltage simultaneously in the utility model.
Description of drawings
Fig. 1 is the structural representation of the fiber-optic grating sensor that provides of the utility model.
Fig. 2 is the structural representation of first sensing head of the fiber-optic grating sensor that provides of the utility model.
Fig. 3 is the structural representation of second sensing head of the fiber-optic grating sensor that provides of the utility model.
Fig. 4 is the structural representation of the fiber grating sensing system that provides of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.
Referring to Fig. 1.Fiber-optic grating sensor of the present utility model as shown in Figure 1, described fiber-optic grating sensor 4 comprises first sensing head 41 and second sensing head 42.
As shown in Figure 2, described first sensing head 41 comprises first optical fiber 411, and described first optical fiber 411 has first Bragg grating 4111, second Bragg grating 4112; Described first Bragg grating 4111 is by thermal insulation material 43 encapsulation; Described second Bragg grating 4112 is provided with piezoelectric ceramic piece 412, and by thermal insulation material 43 encapsulation.
As shown in Figure 3, described second sensing head 42 comprises second optical fiber 421, and described second optical fiber 421 has the 3rd Bragg grating 4211, the 4th Bragg grating; 4212 described the 3rd Bragg gratings 4211 expose in air; Described the 4th Bragg grating 4212 is provided with the piezoelectric ceramic piece 422 of applying current-to-voltage convertor (not shown), and by thermal insulation material 43 encapsulation.
The length ratio of described first Bragg grating 4111, second Bragg grating 4112, the 3rd Bragg grating 4211, the 4th Bragg grating 4212 is 1: 1: 1: 1.Being provided with of above-mentioned length ratio can guarantee the consistance of fiber grating test, guarantees the accuracy of test data.
The length range of described first Bragg grating 4111, second Bragg grating 4112, the 3rd Bragg grating 4211, the 4th Bragg grating 4212 is 8-12mm, preferred 10mm.
Described first Bragg grating 4111 and second Bragg grating 4112 pass through optical fiber separately, and spacing distance is 1-3mm; The 3rd Bragg grating 4211 and the 4th Bragg grating 4212 pass through optical fiber separately, and spacing distance is 1-3mm; Above-mentioned spacing distance is preferably 2mm.
Referring to Fig. 4.Fiber grating sensing system of the present utility model as shown in Figure 4, this system comprises wideband light source 1, spectroanalysis instrument 2, coupling mechanism 3 and fiber-optic grating sensor 4, described fiber-optic grating sensor 4 comprises first sensing head 41 and second sensing head 42.
Described coupling mechanism 3 is for having the 3db fiber coupler of four ports, and its middle port 3-1 is connected with wideband light source 1, and port 3-2 is connected with spectroanalysis instrument 2, and port 3-3 is connected with first sensing head 41, and port 3-4 is connected with second sensing head 42.
Described first sensing head 41 comprises first optical fiber 411, and described first optical fiber 411 has first Bragg grating 4111, second Bragg grating 4112; Described first Bragg grating 4111 is by thermal insulation material 43 encapsulation; Described second Bragg grating 4112 is provided with piezoelectric ceramic piece 412, and by thermal insulation material 43 encapsulation; Described first optical fiber 411 is connected with port 3-3.
Described second sensing head 42 comprises second optical fiber 421, and described second optical fiber 421 has the 3rd Bragg grating 4211, the 4th Bragg grating; 4212 described the 3rd Bragg gratings 4211 expose in air; Described the 4th Bragg grating 4212 is provided with the piezoelectric ceramic piece 422 of applying current-to-voltage convertor, and by thermal insulation material 43 encapsulation; Described second optical fiber 421 is connected with port 3-4.
For fiber grating, different centre wavelength has the different coefficients of strain to temperature and pressure.In the utility model, described first sensing head 41 comprises first Bragg grating 4111, second Bragg grating 4112, wherein first Bragg grating 4111 is by thermal insulation material encapsulation, after second Bragg grating 4112 is fitted by fiber grating and piezoelectric ceramic piece, and encapsulates with thermal insulation material; Partly there is deformation in the fiber grating of fitting with piezoelectric ceramic piece, therefore grid cycle changes, the centre wavelength that causes second Bragg grating 4112 just reflection wavelength changes, and the reflection wavelength of first Bragg grating 4111 that is encapsulated by thermal insulation material does not then change.Therefore, first sensing head 41 will produce two different reflection peaks, and 4111 pairs of pressure of first Bragg grating have excellent linear response, and second Bragg grating 4112 pairs of voltages, pressure have excellent linear response; Described second sensing head 42 includes optical fiber 421, thermal insulation material 43, piezoelectric ceramic piece 422, the current-to-voltage convertor of Bragg grating, and wherein the 3rd Bragg grating 4211 directly exposes in air; The 4th Bragg grating 4212 is fitted the back by thermal insulation material 43 encapsulation with the piezoelectric ceramic piece 423 that is fitted with current-to-voltage convertor, 4211 pairs of temperature and pressures of the 3rd Bragg grating have excellent linear response, 4212 pairs of pressure of the 4th Bragg grating and have an excellent linear response.
So, described first Bragg grating 4111 corresponding to pressure parameter, second Bragg grating 4112 corresponding to pressure and two parameters of voltage, the 3rd Bragg grating 4211 corresponding to two parameters of temperature and pressure, the 4th Bragg grating 4212 corresponding to pressure and two parameters of electric current.
In the enforcement: wideband light source 1 enters first sensing head 41 and second sensing head 42 respectively through 3db fiber coupler 3, and Bragg grating reflects after 3db fiber coupler 3 enters spectroanalysis instrument 2.When the parameter or the Several Parameters of temperature, pressure, electric current or the voltage of test environment or testee changes, what the reflection peak of first Bragg grating 4111 reacted is the pressure variation of test environment or testee, what the reflection peak of the 3rd Bragg grating 4211 reacted is the variation of the pressure and temperature of test environment or testee, and the pressure variation factor of first Bragg grating 4111 and the 3rd Bragg grating 4211 correspondences is identical; What the reflection peak of second Bragg grating 4112 reacted is the variation of the pressure and the voltage of test environment or testee, what the reflection peak of the 4th Bragg grating 4212 reacted is the variation of the pressure and the electric current of test environment or testee, because second Bragg grating 4112 is different with the applying thing of the 4th Bragg grating 4212, therefore corresponding pressure variation factor also is different.Like this, can obtain the variable quantity of the pressure of test environment or testee by first Bragg grating 4111, can obtain the variation of temperature amount of test environment or testee then by the 3rd Bragg grating 4211, just can obtain the variable quantity of the voltage and current of test environment or testee again by second Bragg grating 4112 and the 4th Bragg grating 4212 respectively.
Fiber-optic grating sensor of the present utility model, adopt multiple different encapsulating structure, Bragg grating is encapsulated by thermal insulation material as Bragg grating being exposed in the air neutralization, exposed airborne grating is because the temperature and pressure effect produces strain, its grid cycle changes, and causes the reflection wavelength of this part fiber grating to change; And by the Bragg grating of thermal insulation material encapsulation because the effect that only is under pressure, its grid also changes, but the reflection wavelength that this part grating changes with directly expose different, the variation that just can measure temperature and pressure by the difference of two reflection peaks of spectroanalysis instrument detection.In like manner, piezoelectric ceramic piece is set on Bragg grating, and by thermal insulation material encapsulation and the piezoelectric ceramic piece of applying current-to-voltage convertor is set on Bragg grating, and, detect the variation that the difference of two reflection peaks just can be measured voltage and current by spectroanalysis instrument by thermal insulation material encapsulation.Therefore the variation of adopting multiple different encapsulating structure can measure temperature, pressure, electric current and the many physical parameters of voltage simultaneously in the utility model.And fiber-optic grating sensor volume of the present utility model is little, simple in structure, can adapt to multiple test environment and condition.
The above is preferred embodiment of the present utility model only, is not to be used to limit protection domain of the present utility model.All within spirit of the present utility model and principle, any modification of being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1, a kind of fiber-optic grating sensor is characterized in that: described fiber-optic grating sensor comprises first sensing head and second sensing head;
Described first sensing head comprises first optical fiber, and described first optical fiber has first Bragg grating, second Bragg grating; Described first Bragg grating is encapsulated by thermal insulation material; Described second Bragg grating is provided with piezoelectric ceramic piece, and is encapsulated by thermal insulation material;
Described second sensing head comprises second optical fiber, and described second optical fiber has the 3rd Bragg grating, the 4th Bragg grating; Described the 3rd Bragg grating exposes in air; Described the 4th Bragg grating is provided with the piezoelectric ceramic piece of applying current-to-voltage convertor, and is encapsulated by thermal insulation material.
2, fiber-optic grating sensor according to claim 1 is characterized in that: the length ratio of described first Bragg grating, second Bragg grating, the 3rd Bragg grating, the 4th Bragg grating is 1: 1: 1: 1.
3, fiber-optic grating sensor according to claim 2 is characterized in that: the length range of described first Bragg grating, second Bragg grating, the 3rd Bragg grating, the 4th Bragg grating is 8-12mm.
4, fiber-optic grating sensor according to claim 3 is characterized in that: described first Bragg grating and second Bragg grating separately, spacing distance is 1-3mm; The 3rd Bragg grating and the 4th Bragg grating separately, spacing distance is 1-3mm.
5, a kind of fiber grating sensing system, this system comprises wideband light source, spectroanalysis instrument, coupling mechanism and fiber-optic grating sensor, it is characterized in that:
Described fiber-optic grating sensor comprises first sensing head and second sensing head;
Described first sensing head comprises first optical fiber, and described first optical fiber has first Bragg grating, second Bragg grating; Described first Bragg grating is encapsulated by thermal insulation material; Described second Bragg grating is provided with piezoelectric ceramic piece, and is encapsulated by thermal insulation material;
Described second sensing head comprises second optical fiber, and described second optical fiber has the 3rd Bragg grating, the 4th Bragg grating; Described the 3rd Bragg grating exposes in air; Described the 4th Bragg grating is provided with the piezoelectric ceramic piece of applying current-to-voltage convertor, and is encapsulated by thermal insulation material.
6, fiber grating sensing system according to claim 5 is characterized in that: the length ratio of described first Bragg grating, second Bragg grating, the 3rd Bragg grating, the 4th Bragg grating is 1: 1: 1: 1.
7, fiber grating sensing system according to claim 6 is characterized in that: the length range of described first Bragg grating, second Bragg grating, the 3rd Bragg grating, the 4th Bragg grating is 8-12mm.
8, fiber-optic grating sensor according to claim 7 is characterized in that: described first Bragg grating and second Bragg grating separately, spacing distance is 1-3mm; The 3rd Bragg grating and the 4th Bragg grating separately, spacing distance is 1-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201295122U CN201364167Y (en) | 2009-01-16 | 2009-01-16 | Fiber grating sensor and system thereof |
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| CNU2009201295122U CN201364167Y (en) | 2009-01-16 | 2009-01-16 | Fiber grating sensor and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153124A (en) * | 2016-09-13 | 2016-11-23 | 成都创慧科达科技有限公司 | A kind of optical fiber temperature and pressure integrative sensor |
| CN110806233A (en) * | 2019-10-28 | 2020-02-18 | 中广核核电运营有限公司 | Fiber grating sensor device and detection device for pressure container |
-
2009
- 2009-01-16 CN CNU2009201295122U patent/CN201364167Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153124A (en) * | 2016-09-13 | 2016-11-23 | 成都创慧科达科技有限公司 | A kind of optical fiber temperature and pressure integrative sensor |
| CN110806233A (en) * | 2019-10-28 | 2020-02-18 | 中广核核电运营有限公司 | Fiber grating sensor device and detection device for pressure container |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20160116 |
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| EXPY | Termination of patent right or utility model |