CN203909120U - Temperature compensating optical current measuring module and optical current transformer - Google Patents
Temperature compensating optical current measuring module and optical current transformer Download PDFInfo
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- CN203909120U CN203909120U CN201420216648.8U CN201420216648U CN203909120U CN 203909120 U CN203909120 U CN 203909120U CN 201420216648 U CN201420216648 U CN 201420216648U CN 203909120 U CN203909120 U CN 203909120U
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- temperature sensor
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- 230000003287 optical effect Effects 0.000 title claims abstract description 65
- 239000011521 glass Substances 0.000 claims abstract description 30
- 230000005291 magnetic effect Effects 0.000 claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 36
- 239000000835 fiber Substances 0.000 claims description 14
- 230000010287 polarization Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
The utility model discloses a temperature compensating optical current measuring module and optical current transformer. The optical current measuring module comprises an incident optical fiber in connection with a light source and an emitting optical fiber in connection with an optical signal demodulator; a first self-focusing lens, a polarizer, magnetic light glass, a polarization analyzer and a second self-focusing lens are successively arranged between the incident optical fiber and the emitting optical fiber; the surface of the magnetic light glass is provided with a temperature sensor used for measuring inner temperature. According to the utility model, a surface of a measuring optical element is provided with the temperature sensor to measure inner temperature of the magnetic light glass and to sense temperature changes; measured current sensed by the magnetic light glass is demodulated from an emitting optical signal E2, and a Faraday magnetic declination coefficient of the magnetic light glass is corrected in a temperature compensating mode to accurately measure current compensation. The optical current measuring module has the characteristics of high structural stability and measuring precision, large measuring dynamic scope, non-magnetic saturation, wide measuring frequency band and temperature range, etc.
Description
Technical field
The utility model relates to a kind of optical current measurement module and optical current mutual inductor of temperature compensation.
Background technology
The ferromagnetic material existing due to traditional electromagnetic current transducer is saturated, the problems such as DC component measurement and High-Voltage Insulation, along with the development of China's intelligent grid, just need to solve the gordian technique that these affect UHV (ultra-high voltage) and extra-high voltage development, for this reason, development in recent years the new-style electronic current transformer of various ways, wherein, it is good that optical current mutual inductor based on Faraday magnetooptical effect has insulating property, non-transient magnetic saturation, range of dynamic measurement is large, frequency response is wide, anti-electromagnetic interference capability is strong, volume is little lightweight, easily and the advantage such as digital facility interface, it is optimal electronic current mutual inductor, it is the main direction of electronic current mutual inductor development.
Optical current sensor has safe compared to conventional current sensor, precision is high, numerous advantages such as measurement range is wide, but do not promoted fully in actual applications so far, reason is current optical current sensor, be subject to temperature, time, position, the impact of the factors such as external magnetic field, cause sensor accuracy to be difficult to meet the demands, and large electric current, the measurement of super-large current is often very being carried out under rugged environment, this just causes temperature particularly outstanding on the impact of sensor, because temperature has directly caused measuring accuracy to reduce and error increase on the impact of optical sensor device (magneto-optic glass or sensor fibre), have a strong impact on precision and the accuracy of current measurement, be difficult to meet the measuring accuracy requirement of 0.2s level.
The principle of optical current sensor: light beam is during by magneto-optical crystal (being generally magneto-optic glass), and due to Faraday effect, the polarization state of light field can rotate under the impact in magnetic field.Light beam is obtained to linearly polarized light by the polarizer; By magneto-optical crystal, under the impact in magnetic field, light beam polarization direction rotates again; By analyzer detection polarization direction rotation angle, can measure the size in magnetic field.Because the magnetic effect of electric current can produce magnetic field, calculate corresponding size of current by the large I of measuring magnetic field.But because the Verdet constant of magneto-optical crystal size is inversely proportional to temperature, so in the time that variation of ambient temperature is larger, measurement result has certain error.
Utility model content
The purpose of this utility model is to provide a kind of optical current measurement module of temperature compensation, cannot accurately measure the problem of electric current to solve existing optical current sensor temperature influence, a kind of optical current mutual inductor that uses this optical current measurement module is provided simultaneously.
In order to realize above object, the technical scheme that the utility model adopts is: a kind of optical current measurement module of temperature compensation, comprise the incident optical for being connected with light source and the outgoing optical fiber for being connected with light signal detuner, between described incident optical and outgoing optical fiber, be laid with in turn the first GRIN Lens, the polarizer, magneto-optic glass, analyzer and the second GRIN Lens; Described magneto-optic glass surface is provided with the temperature sensor for measuring its internal temperature.
This optical current measurement module is sealed in airtight non magnetic container.
Described temperature sensor is fibre optic temperature sensor, and the signal output part of this fibre optic temperature sensor is connected with light signal detuner by optical fiber.
Described light source is the light source of establishing in light signal detuner.
The technical scheme that the optical current mutual inductor of the utility model temperature compensation adopts is: a kind of optical current mutual inductor of temperature compensation, comprise light source and light signal detuner and optical current measurement module, described optical current measurement module comprises the incident optical for being connected with light source and the outgoing optical fiber for being connected with light signal detuner, between described incident optical and outgoing optical fiber, is laid with in turn the first GRIN Lens, the polarizer, magneto-optic glass, analyzer and the second GRIN Lens; Described magneto-optic glass surface is provided with the temperature sensor for measuring its internal temperature.
This optical current measurement module is sealed in airtight non magnetic container.
Described temperature sensor is fibre optic temperature sensor, and the signal output part of this fibre optic temperature sensor is connected with light signal detuner by optical fiber.
Described light source is the light source of establishing in light signal detuner.
The optical current measurement module of temperature compensation of the present utility model and optical current mutual inductor are being measured optical element---magneto-optic glass surface set temperature sensor, for measuring the internal temperature of magneto-optic glass, again by receiving emergent light signal E2, therefrom demodulate the tested electric current that magneto-optic glass is experienced, utilize the internal temperature of temperature sensor perception magneto-optic glass to change, by the mode of temperature compensation, revise the coefficient of faraday's magnetic declination of magneto-optic glass, realize the compensation of accurately measuring electric current.The structural stability of this optical current measurement module is good, and measuring accuracy is high, not only has that the dynamic range of measurement is large, saturated without electromagnetism, measurement bandwidth, the wide feature of temperature range, but also has advantages of environmental protection and safe.
Brief description of the drawings
Fig. 1 is the utility model optical current measurement module structural representation;
Fig. 2 is the structural representation of the utility model optical current mutual inductor.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.
Be illustrated in figure 1 the structure principle chart of the optical current measurement module embodiment of the utility model temperature compensation, as seen from the figure, this measurement module comprises the incident optical for being connected with light source and the outgoing optical fiber for being connected with light signal detuner, is laid with in turn the first GRIN Lens 11, the polarizer 2, magneto-optic glass 3, analyzer 4 and the second GRIN Lens 12 between incident optical and outgoing optical fiber; This magneto-optic glass surface is provided with the temperature sensor 5 for measuring its internal temperature.
The temperature sensor of the present embodiment is fibre optic temperature sensor, and the output signal of this fibre optic temperature sensor is connected with the temperature signal optical receiver of light signal detuner by temperature signal optical fiber; Outgoing optical fiber is connected with the optical signal receiver of light signal detuner.Adopt fibre optic temperature sensor can make it be applied to various hyperbaric environments, adaptability is stronger, lower to environmental requirement.
In addition; this optical current measurement module is sealed in airtight non magnetic container 6; corresponding element has been played to protective effect; avoid the damage to element; and moisture etc. while also having got rid of temperature variation (the hydrogenesis phenomenon occurring while reduction such as temperature) impact on measuring accuracy; when ambient temperature changes greatly, the closed environment of internal tank changes comparatively slow, has built a more stable measurement environment.
The light source of the present embodiment adopts the light source of establishing in light signal detuner self, forms a closed-loop measuring loop, need to regulate according to measuring, more convenient reliable.Certainly, light source herein also can adopt a constant external light source.
As shown in Figure 2, the utility model also provides a kind of optical current mutual inductor of temperature compensation, comprise the optical current measurement module that light source is connected with light signal detuner and with light source and light signal detuner, the structure of described optical current measurement module is described above.
Principle of work of the present utility model is as follows: the incident light that light intensity is E1 conducts to the polarizer 2 through the first GRIN Lens 11 and produces polarized light E0, then conducts to after the second GRIN Lens 12 outgoing through magneto-optic glass 3 and analyzer 4, and the light intensity of emergent light is E2; Fibre optic temperature sensor 5 is fixed on magneto-optic glass surface for measuring the internal temperature of thermal module.Receive emergent light signal E2 by light signal detuner, therefrom demodulate the tested electric current that magneto-optic glass is experienced, utilize the internal temperature of fibre optic temperature sensor perception magneto-optic glass to change, by the mode of temperature compensation, revise the coefficient of faraday's magnetic declination of magneto-optic glass, reach the object of accurate measurement electric current.
The utility model light signal and temperature signal are respectively independently measuring-signal, process after being converted into current signal, and data processing is comparatively simple and convenient, practical, and operability is high.Principle and process that this optical current measurement module electric current is accurately measured are as follows: explain according to faraday's magnetic rotation effect, when the magnetic direction producing when current i is parallel with the direction of propagation of the linearly polarized light by magneto-optic glass, the polarization angle of its linearly polarized light will change, polarization angle θ=V (α) Ki
The Field constant of V in formula (α)---magneto-optic memory technique is the function of temperature;
I---tested electric current;
The multiple relation of K---magnetic field integration and tested electric current.
In the time considering temperature factor, the output intensity after analyzer
E in formula
0for the intensity of incident ray polarized light;
F (α) is that the light intensity of the magneto-optic glass that caused by temperature changes;
The rotation angle of the linearly polarized light plane of polarization that the tested electric current of θ produces.
During because of 2 θ ≈ 0, sin (2 θ) ≈ 2 θ,
therefore,, as long as measure the temperature of magneto-optic glass, just can realize electric current is accurately measured.
Above embodiment is only for helping to understand core concept of the present utility model; can not limit the utility model with this; for those skilled in the art; every foundation thought of the present utility model; the utility model is modified or is equal to replacement; any change of doing in specific embodiments and applications, within all should being included in protection domain of the present utility model.
Claims (8)
1. the optical current measurement module of a temperature compensation, it is characterized in that: comprise the incident optical for being connected with light source and the outgoing optical fiber for being connected with light signal detuner, between described incident optical and outgoing optical fiber, be laid with in turn the first GRIN Lens, the polarizer, magneto-optic glass, analyzer and the second GRIN Lens; Described magneto-optic glass surface is provided with the temperature sensor for measuring its internal temperature.
2. the optical current measurement module of temperature compensation according to claim 1, is characterized in that: this optical current measurement module is sealed in airtight non magnetic container.
3. the optical current measurement module of temperature compensation according to claim 1, is characterized in that: described temperature sensor is fibre optic temperature sensor, and the signal output part of this fibre optic temperature sensor is connected with light signal detuner by optical fiber.
4. according to the optical current measurement module of the temperature compensation described in claim 1～3 any one, it is characterized in that: described light source is the light source of establishing in light signal detuner.
5. the optical current mutual inductor of a temperature compensation, comprise light source and light signal detuner and optical current measurement module, it is characterized in that: described optical current measurement module comprises the incident optical for being connected with light source and the outgoing optical fiber for being connected with light signal detuner, between described incident optical and outgoing optical fiber, be laid with in turn the first GRIN Lens, the polarizer, magneto-optic glass, analyzer and the second GRIN Lens; Described magneto-optic glass surface is provided with the temperature sensor for measuring its internal temperature.
6. the optical current mutual inductor of temperature compensation according to claim 5, is characterized in that: this optical current measurement module is sealed in airtight non magnetic container.
7. the optical current mutual inductor of temperature compensation according to claim 5, is characterized in that: described temperature sensor is fibre optic temperature sensor, and the signal output part of this fibre optic temperature sensor is connected with light signal detuner by optical fiber.
8. according to the optical current mutual inductor of the temperature compensation described in claim 5～7 any one, it is characterized in that: described light source is the light source of establishing in light signal detuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420216648.8U CN203909120U (en) | 2014-04-29 | 2014-04-29 | Temperature compensating optical current measuring module and optical current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420216648.8U CN203909120U (en) | 2014-04-29 | 2014-04-29 | Temperature compensating optical current measuring module and optical current transformer |
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| CN203909120U true CN203909120U (en) | 2014-10-29 |
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| CN201420216648.8U Expired - Fee Related CN203909120U (en) | 2014-04-29 | 2014-04-29 | Temperature compensating optical current measuring module and optical current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN104931142A (en) * | 2015-07-01 | 2015-09-23 | 西安邮电大学 | Temperature compensating crystal type polarization interference apparatus |
-
2014
- 2014-04-29 CN CN201420216648.8U patent/CN203909120U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN104931142A (en) * | 2015-07-01 | 2015-09-23 | 西安邮电大学 | Temperature compensating crystal type polarization interference apparatus |
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| 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: 20141029 Termination date: 20200429 |