CN203572863U - Optical fiber grating current sensor based on single-level refrigeration sheet - Google Patents
Optical fiber grating current sensor based on single-level refrigeration sheet Download PDFInfo
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- CN203572863U CN203572863U CN201320597585.0U CN201320597585U CN203572863U CN 203572863 U CN203572863 U CN 203572863U CN 201320597585 U CN201320597585 U CN 201320597585U CN 203572863 U CN203572863 U CN 203572863U
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- cooling piece
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Abstract
The utility model relates to a current sensor, in particular to an optical fiber grating current sensor based on a single-level refrigeration sheet. The optical fiber grating current sensor comprises the single-level refrigeration sheet, a testing grating and a compensation grating, wherein the testing grating is in contact with the single-level refrigeration sheet, and the compensation grating is connected in series with the testing grating. The single-level refrigeration sheet is adopted to be used as an element for detecting the current intensity, the external electromagnetic interference is effectively avoided, the detection accuracy is improved, and the optical fiber grating current sensor is particularly suitable for current detection in a strong magnetic field. The optical fiber grating is adopted as a signal sensing channel, higher safety is realized, in addition, error information caused by power supply interference can be avoided, and higher stability and higher accuracy are realized. Therefore, the application environment range of the current sensor can be effectively enlarged, in addition, the detection precision in the magnetic environment is improved.
Description
Technical field
The utility model relates to a kind of current sensor, is specifically related to a kind of fiber Bragg grating current sensor based on single-stage cooling piece.
Background technology
Existing current sensor is based on closed loop hall effect current sensor, has utilized the electromagnetic field principle of former limit wire.Hall effect refers to when former limit wire is during through over-current sensor, primary current IP can produce the magnetic line of force, the former limit magnetic line of force concentrates on around magnetic core, the Hall electrode being built in magnetic core air gap can produce the only voltage of several millivolts of size being directly proportional with the former limit magnetic line of force, and electronic circuit can be transformed into secondary current IS this small signal.The output signal of current sensor is secondary current IS, and it is directly proportional to input signal (primary current IP), and IS is generally very little, only has 100 ~ 400mA.If output current, through measuring resistance RM, can obtain the output voltage signal that a size being directly proportional to primary current is several volts.
Therefore existing current sensor is inevitably subject to external electromagnetic field interference, as:
Whether foreign current size and power frequency near <1> sensor change;
The position of Hall electrode in the distance of <2> outer lead and sensor, the shape of outer lead, position and sensor;
The material that <3> sensor installation is used has nonmagnetic;
Whether the current sensor that <4> is used shields;
<5> Electro Magnetic Compatibility.
Electro Magnetic Compatibility EMC(Electro-Magnetic Compatibility), that the electric and electronic equipment of research can be carried out the coexisting state of function separately in common electromagnetic environment, require the above-mentioned various device in same electromagnetic environment normally to work and not interfere with each other, reach a subject of " compatibility " state.The deterioration of space electromagnetic environment more and more easily makes the misoperation because of incompatible initiating system between electronic devices and components, and therefore electrician, the electronic equipment electromagnetic compatibility detection utmost point are necessary.
Therefore,, when existing current sensor can not be avoided external electromagnetic field to the interference of testing result, the detection that is just necessary to develop electric current under a kind of environment that goes for magnetic interference, is suitable for the current sensing means under high-intensity magnetic field especially.
Utility model content
The purpose of this utility model is to provide one can avoid external electromagnetic interference, has extensive environmental suitability, and Measurement sensibility also can be combined with intelligent grid, realizes the fiber Bragg grating current sensor based on single-stage cooling piece of remote online safety monitoring.
For solving the problems of the technologies described above, the technical scheme that the utility model is taked is as follows:
The utility model comprises single-stage cooling piece, the test gratings contacting with single-stage cooling piece and the null grating being in series with test gratings.
Further, the utility model also comprises the lead-in wire of drawing from single-stage cooling piece.
Further, the utility model also comprises the heat-conducting silicone grease being filled between single-stage cooling piece and test gratings.
Further, the utility model also comprises the optical fiber of connecting test grating and null grating, and the end of described optical fiber connects fiber grating network analyzer.
Single-stage cooling piece described in the utility model refers to single-stage conductor refrigeration sheet (ThermoelectricCooler, TEC), and it is to utilize the Peltier effect of semiconductor material to make.So-called Peltier effect, while referring to the galvanic couple forming by two kinds of semiconductor materials when DC current, its one end heat absorption, the phenomenon of one end heat release.The bismuth telluride of heavily doped N-type and P type is mainly as the semiconductor material of TEC, and bismuth telluride element adopts electricity series connection, and is parallel heating.TEC comprises that some P types and N-type are to (group), and they connect together by electrode, and is clipped between two ceramic electrodes; When having electric current to flow through from TEC, the heat that electric current produces can pass to opposite side from a side of TEC, produces " heat " side with " cold on TEC " side, heating and the refrigeration principle of Here it is TEC.Semiconductor cooler is refrigeration or heating, and the speed of refrigeration, heating, by the direction of current by it and size, is decided.The current purposes of TEC is very extensive, and most typical application is the temperature control of laser instrument and the temperature control of PCR, but its field that is applied to current measurement is that this patent proposes first.
Fiber grating described in the utility model is the photosensitivity of utilizing fiber optic materials, method by ultraviolet photoetching writes fibre core by incident light coherent field pattern, in fibre core, produce along the axial refractive index cycle of fibre core and change, thereby form the phase grating in permanent space, its effect forms in fact an arrowband (transmission or reflection) wave filter or catoptron in fibre core.
The effect of test gratings described in the utility model is the temperature variation of single-stage cooling piece before and after impression energising.
The effect of null grating described in the utility model is to experience room temperature to change, and eliminates room temperature and changes the impact on test gratings, increases the Stability and veracity of testing result.
The beneficial effect that the utility model adopts technique scheme to obtain is:
The utility model adopts semiconductor cooler as the original paper that detects size of current, due to its utilization is the mutual conversion of electric energy and heat energy, and effectively avoided the interference of external electromagnetic, compare the existing current sensor that utilizes closed loop Hall effect, it is highly suitable for the detection of electric current under the environment of magnetic interference, especially be suitable for the current detecting under high-intensity magnetic field, therefore the utility model can effectively increase the applicable environmental field of current sensor.
The utility model adopts single-stage cooling piece to be particularly useful for the detection to little electric current.
The utility model adopts the passage of fiber grating as sensing, and what fiber grating was used is light signal, can not produce electric spark, during use, can have better security than the sensor of electric signal; Fiber-optic grating sensor can be avoided disturbing because of power supply the error message producing; On an optical cable, can be connected in series dozens of fiber-optic grating sensor,, therefore there is abnormal occurrence at any position in installation that can be intensive at the position of needs, can be transferred in time Central Control Room; Fiber-optic grating sensor belongs to the Fibre Optical Sensor of wavelength-modulated type nonlinear interaction.By the wavelength of modulated incident light beam to be measured, measure catoptrical wavelength variations and detect.Because wavelength is an absolute reference, be not subject to overall light intensity levels, connect optical fiber and the loss at coupling mechanism place or the impact of energy of light source, therefore more stable, accurate than other mode.
Accompanying drawing explanation
Fig. 1 is the structural representation of current sensor of the present utility model;
Fig. 2 is the principle schematic of the utility model semiconductor cooler;
In the accompanying drawings, 1 semiconductor chilling plate, 1-1 lead-in wire, 2 test gratings, 3 null gratings, 4 optical fiber, 5 need to detect power supply.
Embodiment
To the explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
As shown in Figure 1, the current sensor of the present embodiment comprises semiconductor chilling plate 1, the test gratings 2 contacting with semiconductor chilling plate 1 and the null grating 3 being in series with test gratings 2.Wherein semiconductor chilling plate is single-stage cooling piece, and producer and model are Hebei space Xiang electronics TEC1-12705; Test gratings is that C-band is cut toe fiber grating, and producer and model are the Hebei GE-FBG1 of Di Jing Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 type grating; Null grating is that C-band is cut toe fiber grating, and producer and model are the Hebei GE-FBG1 of Di Jing Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 type grating.The current sensor of the present embodiment also comprises the lead-in wire 1-1 that draws from semiconductor chilling plate 1 and the optical fiber 4 of connecting test grating 2 and null grating 3, and described optical fiber 4 ends connect fiber grating network analyzers.Wherein the producer of fiber grating network analyzer and model are the Hebei GE-110 of Di Jing Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 analyser.
As shown in Figure 2, the semiconductor chilling plate of the present embodiment is single-stage cooling piece, and the charge carrier of N-type element is wherein electronics, and the charge carrier of P type element is hole.When the N-type element access direct current positive pole of thermocouple, during P type element access negative pole, electronics in N-type element moves down under electric field action, in the positive charge polymerization of lower end and power supply, heat release during polymerization, hole in same P type element moves down under electric field action, in the negative charge polymerization of lower end and power supply, heat release during polymerization; Meanwhile, electronics is separation in upper end with hole, absorbs heat during separation.When changing sense of current, heat absorbing end can become release end of heat, and release end of heat can become heat absorbing end.
Under certain external environment, when electric current increases, thermal value increases, and causes TEC hot-side temperature to increase, and cold junction temperature reduces.
The present embodiment is applied to the detection of power supply, and power positive cathode is accessed to TEC cooling piece, and this cooling piece is placed in to magnetic field carries out electromagnetic interference (EMI).
Before installation, first determine the polarity of semiconductor chilling plate.One joint dry cell is connected on two lead-in wires of refrigerator, just can feels that one end obviously sends out cool and other end heating, remember the polarity going between and determine the cool and heat ends of refrigerator.
Step 1: null grating 3 ends obtain the external fiber grating network analyzer of optical fiber 4, determine initial center wavelength, are 1550nm.
Step 2: evenly coat heat-conducting silicone grease at refrigerator two ends, described test gratings 2 is fixed with semiconductor chilling plate 1 close contact.
Step 3: semiconductor chilling plate 1 being connected with needing detection power supply, reading the inspection center's wavelength in fiber grating network analyzer, is 1550.67nm.
Step 4: according to inspection center's wavelength and initial center wavelength, by formula (1) calculating temperature difference, be 67 ℃.
formula (1)
Be wherein temperature variation, unit is K;
λ
bfor initial center wavelength, unit is nm;
λ
bfor the difference of inspection center's wavelength and initial center wavelength, unit is nm;
α
ffor the thermal expansivity of optical fiber, unit is k
-1;
ζ is the thermo-optical coeffecient of fiber optic materials, and unit is k
-1.
Step 5: according to the parameter of the temperature difference of calculating in step 4 and described semiconductor chilling plate 1, calculating by formula 2 current value that needs to detect power supply, is 5A.
Wherein I is electric current, and unit is A;
C is semiconductor chilling plate specific heat capacity, and unit is J/kg;
M is semiconductor refrigerating tablet quality, and unit is kg;
△ T is semiconductor chilling plate temperature difference, and unit is ℃.
From above-mentioned data, conform to power supply mark value (actual value) with the current value that current sensor of the present utility model detects, and cannot detect with existing commercially available current sensor.
The utility model adopts single-stage cooling piece as the original paper that detects size of current, due to its utilization is the mutual conversion of electric energy and heat energy, effectively avoided the interference of external electromagnetic, compare the existing current sensor that utilizes closed loop Hall effect, be highly suitable for the detection of electric current under the environment of magnetic interference, especially be suitable for the current detecting under high-intensity magnetic field, effectively increase the applicable environmental field of current sensor.
Claims (4)
1. the fiber Bragg grating current sensor based on single-stage cooling piece, is characterized in that it comprises single-stage cooling piece (1), the test gratings (2) contacting with single-stage cooling piece (1) and the null grating (3) being in series with test gratings (2).
2. a kind of fiber Bragg grating current sensor based on single-stage cooling piece according to claim 1, is characterized in that it also comprises the lead-in wire (1-1) of drawing from single-stage cooling piece (1).
3. a kind of fiber Bragg grating current sensor based on single-stage cooling piece according to claim 1, is characterized in that it also comprises the heat-conducting silicone grease being filled between single-stage cooling piece (1) and test gratings (2).
4. a kind of fiber Bragg grating current sensor based on single-stage cooling piece according to claim 1, it is characterized in that the optical fiber (4) that it also comprises connecting test grating (2) and null grating (3), the end of described optical fiber (4) connects fiber grating network analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597585.0U CN203572863U (en) | 2013-09-26 | 2013-09-26 | Optical fiber grating current sensor based on single-level refrigeration sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320597585.0U CN203572863U (en) | 2013-09-26 | 2013-09-26 | Optical fiber grating current sensor based on single-level refrigeration sheet |
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| CN203572863U true CN203572863U (en) | 2014-04-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529270A (en) * | 2013-09-26 | 2014-01-22 | 石家庄经济学院 | Optical fiber grating current sensor based on refrigeration sheet and detection method of optical fiber grating current sensor |
-
2013
- 2013-09-26 CN CN201320597585.0U patent/CN203572863U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529270A (en) * | 2013-09-26 | 2014-01-22 | 石家庄经济学院 | Optical fiber grating current sensor based on refrigeration sheet and detection method of optical fiber grating current sensor |
| CN103529270B (en) * | 2013-09-26 | 2017-01-11 | 石家庄经济学院 | Optical fiber grating current sensor based on refrigeration sheet and detection method of optical fiber grating current sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID JILI Effective date: 20141226 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhu Yuehong Inventor after: Wen Jihua Inventor after: Liang Ping Inventor after: Kang Junjian Inventor after: Zheng Yibo Inventor after: Yu Xu Inventor after: Wang Xue Inventor before: Zhu Yuehong Inventor before: Wen Jihua Inventor before: Liang Ping Inventor before: Kang Junjian Inventor before: Zheng Yibo |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHU YUEHONG WEN JIHUA LIANG PING KANG JUNJIAN ZHENG YIBO TO: ZHU YUEHONG WEN JIHUA LIANG PING KANG JUNJIAN ZHENG YIBO YU XU WANG XUE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20141226 Address after: 050031 Institute of Opto electronics, Shijiazhuang University Of Economics, No. 136 Huai Dong Road, Hebei, Shijiazhuang Patentee after: SHIJIAZHUANG University OF ECONOMICS Patentee after: JILIN PROVINCE ELECTRIC POWER RESEARCH INSTITUTE OF JILIN ELECTRIC POWER Co.,Ltd. Patentee after: JILIN PROVINCE ELECTRIC POWER RESEARCH INSTITUTE Ltd. Address before: 050031 Institute of Opto electronics, Shijiazhuang University Of Economics, No. 136 Huai Dong Road, Hebei, Shijiazhuang Patentee before: Shijiazhuang University of Economics |
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| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |