CN203572866U - Optical fiber grating current sensor based on three-level refrigeration sheet - Google Patents
Optical fiber grating current sensor based on three-level refrigeration sheet Download PDFInfo
- Publication number
- CN203572866U CN203572866U CN201320597987.0U CN201320597987U CN203572866U CN 203572866 U CN203572866 U CN 203572866U CN 201320597987 U CN201320597987 U CN 201320597987U CN 203572866 U CN203572866 U CN 203572866U
- Authority
- CN
- China
- Prior art keywords
- grating
- current sensor
- optical fiber
- refrigeration sheet
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model relates to a current sensor, in particular to an optical fiber grating current sensor based on a three-level refrigeration sheet. The optical fiber grating current sensor comprises the three-level refrigeration sheet, a testing grating and a compensation grating, wherein the testing grating is in contact with the three-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, the optical fiber grating current sensor is particularly suitable for current detection in a strong magnetic field, and the refrigeration effect is enhanced compared with using a signal-level refrigeration sheet. 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, and 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 cold of three tier structure.
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, be built in Hall electrode in magnetic core air gap and can produce the only voltage of several millivolts of the size that is directly proportional with the former limit magnetic line of force, 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 between electronic devices and components the misoperation because of incompatible initiating system, so 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, be just necessary to develop the detection of electric current under a kind of environment that goes for magnetic interference, be especially suitable for the current sensing means under high-intensity magnetic field.
Utility model content
The purpose of this utility model is to provide a kind of 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 cold of three tier structure 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 comprise cold of three tier structure, with cold test gratings contacting of three tier structure and the null grating that is in series with test gratings.
Further, the utility model also comprises from cold lead-in wire of drawing of three tier structure.
Further, the utility model also comprises the heat-conducting silicone grease being filled between cold of three tier structure and test gratings.
Further, the utility model also comprises the optical fiber that connects detection grating and null grating, and the end of described optical fiber connects fiber grating network analyzer.
Cold of three tier structure described in the utility model refers to three semiconductor chilling plates is cascaded, and all cold junctions are concentrated on one side, and hot junction concentrates on the cooling piece that the cooling piece of another side obtains.Conductor refrigeration sheet (ThermoelectricCooler, TEC), TEC utilizes 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; It is cold that 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, on TEC, produces " heat " side with " " 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 cold of impression energising front and back three tier structure.
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, so the utility model can effectively increase the applicable environmental field of current sensor.
Cold of employing three tier structure of the present invention, because refrigeration is strengthened compared with single-stage cooling piece, therefore comparatively suitable to the detection of large electric current, and measurement result is more accurate.
The utility model adopts fiber grating as the passage of 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 structural representation of the three tier structure cooler of the utility model embodiment 1.
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
Explanation to the disclosed embodiments, makes 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 that cold of three tier structure is in series by single-stage cooling piece, and producer and the model of level cooling piece 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 the end of described optical fiber 4 connects fiber grating network analyzer.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 present embodiment is used three level semiconductor cooling pieces, and the huyashi-chuuka (cold chinese-style noodles) of a block semiconductor cooling piece absorbs the mode that is connected in series of the heating of a block semiconductor cooling piece below above.
The detection of the present embodiment applied power source:
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: the external fiber grating network analyzer of null grating 3, determine initial center wavelength, be 1560nm.
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;
Electric current is shunted to processing with shunt, and wherein the method for shunting is the conventional technological means in this area.
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 1560.67nm.
Step 4: according to inspection center's wavelength and initial center wavelength, by formula (1) calculating temperature difference, be 67 ℃.
Wherein T is temperature variation, and 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 the current value that needs to detect power supply by formula (2), is 5A.It is 30A that partial current value is converted to primary current value.Wherein, according to partial current value, calculating total current value is to well known to a person skilled in the art technological means.
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, with the current value that current sensor of the present utility model detects, conform to power supply mark value (actual value), and cannot detect with existing commercially available current sensor.
The utility model adopts cold original paper as detection size of current of three tier structure, 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 cold of three tier structure, is characterized in that it comprises three tier structure cold (1), the test gratings (2) contacting with three tier structure cold (1) and the null grating (3) being in series with test gratings (2).
2. a kind of fiber Bragg grating current sensor based on cold of three tier structure according to claim 1, is characterized in that it also comprises the lead-in wire (1-1) of drawing from three tier structure cold (1).
3. a kind of fiber Bragg grating current sensor based on cold of three tier structure according to claim 1, is characterized in that it also comprises the heat-conducting silicone grease being filled between three tier structure cold (1) and test gratings (2).
4. a kind of fiber Bragg grating current sensor based on cold of three tier structure according to claim 1, it is characterized in that it also comprises the optical fiber (4) that connects detection 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 |
|---|---|---|---|
| CN201320597987.0U CN203572866U (en) | 2013-09-26 | 2013-09-26 | Optical fiber grating current sensor based on three-level refrigeration sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597987.0U CN203572866U (en) | 2013-09-26 | 2013-09-26 | Optical fiber grating current sensor based on three-level refrigeration sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203572866U true CN203572866U (en) | 2014-04-30 |
Family
ID=50540593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597987.0U Expired - Fee Related CN203572866U (en) | 2013-09-26 | 2013-09-26 | Optical fiber grating current sensor based on three-level refrigeration sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203572866U (en) |
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 CN201320597987.0U patent/CN203572866U/en not_active Expired - Fee Related
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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Madeti et al. | Monitoring system for photovoltaic plants: A review | |
| CN103364658A (en) | Method for predicting service life of transformer based on fiber grating temperature measurement system | |
| CN105718694B (en) | Ther mal network parameter identification method based on IGBT junction temperature information | |
| CN102103173A (en) | Method and system for monitoring current-carrying capacity of cable based on distributed optical fiber temperature measuring method | |
| CN103499768A (en) | Power cable real-time state monitoring and operation management system and measuring method of temperature of cable | |
| CN103487162A (en) | High voltage equipment contact temperature online monitoring system based on optical fiber network | |
| CN109580039A (en) | Battery temperature based on intensive fiber grating temperature sensor monitors system | |
| CN103759855A (en) | Temperature sensing system with FBG | |
| CN111238682A (en) | Power transformer oil temperature monitoring system based on fiber bragg grating | |
| CN107422215A (en) | A kind of current-carrying capacity of cable monitoring method and system based on distributed optical fiber temperature measurement technology | |
| CN201955411U (en) | Cable current carrying capacity monitoring system based on distributed optical fiber temperature measuring method | |
| CN104374423A (en) | Cluster high-voltage switch cabinet online monitoring device and monitoring method thereof | |
| CN103278261B (en) | High-stability distributed type fiber temperature detection device and calibration method | |
| CN203479425U (en) | High-voltage equipment contact temperature on-line monitoring system based on optical network | |
| CN103608657B (en) | For determining the method for the temperature in the winding of the sub-conductor of motor | |
| CN203572866U (en) | Optical fiber grating current sensor based on three-level refrigeration sheet | |
| CN103837774A (en) | Dry type air reactor monitoring device based on SVM | |
| CN103529270B (en) | Optical fiber grating current sensor based on refrigeration sheet and detection method of optical fiber grating current sensor | |
| CN203572863U (en) | Optical fiber grating current sensor based on single-level refrigeration sheet | |
| CN206340633U (en) | A kind of automobile batteries device for detecting temperature | |
| CN106654812A (en) | High power optical fiber laser key point protection device | |
| CN203658436U (en) | Fiber grating current sensor based on heating sheet | |
| CN204389060U (en) | Transformer optical fiber grating temperature-measuring system | |
| CN207181550U (en) | A kind of current-carrying capacity of cable monitoring system based on distributed optical fiber temperature measurement technology | |
| CN201926524U (en) | Fiber Bragg grating temperature measuring system and multipoint temperature measuring system |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20160926 |