CN108872681B - Optical current transformer realized based on strip-shaped radial polarization grating - Google Patents
Optical current transformer realized based on strip-shaped radial polarization grating Download PDFInfo
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- CN108872681B CN108872681B CN201810776271.4A CN201810776271A CN108872681B CN 108872681 B CN108872681 B CN 108872681B CN 201810776271 A CN201810776271 A CN 201810776271A CN 108872681 B CN108872681 B CN 108872681B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to an optical current transformer realized based on a strip-shaped radial polarization grating, which comprises a magnetic collecting ring, a light source, a first magnetic conduction plate, a second magnetic conduction plate, a CCD (charge coupled device) image sensor, a polarizer, a magneto-optical film and the strip-shaped radial polarization grating, wherein the magnetic collecting ring is arranged on the magnetic collecting ring; the magnetic collecting ring is arranged on the outer side of the bus; the magnetic collecting ring is provided with an opening, and a first magnetic conduction plate and a second magnetic conduction plate are arranged in parallel in the opening; a light source is arranged on the upper side of the first magnetic conduction plate; a CCD image sensor is arranged on the lower side of the second magnetic conduction plate; the polarizer, the magneto-optical film and the shaped radial polarization grating are sequentially arranged between the first magnetic conduction plate and the second magnetic conduction plate from top to bottom, and the first magnetic conduction plate and the second magnetic conduction plate are provided with through holes for light paths to pass through. The optical current transformer has the advantages of no relation with optical power in detection, linear measurement and large measurement range.
Description
Technical Field
The invention belongs to the technical field of current measurement of power systems, and particularly relates to an optical current transformer realized based on a strip-shaped radial polarization grating.
Background
The optical current transformer adopts an optical sensing technology, has the advantages of good insulating property, strong anti-interference capability, no transient magnetic saturation, digitalization and the like, and meets the development requirements of an intelligent power grid. The optical current transformer is based on Faraday magneto-optical effect, that is, when linearly polarized light passes through magneto-optical material under the action of external magnetic field parallel to its propagation direction, its polarization plane will rotate, and the rotation angle is in direct proportion to the current. The existing detection mode can not directly and linearly measure the rotation angle, but adopts a polarized light intensity demodulation mode to indirectly measure. This measurement method has the following problems (1) of optical power dependence. The measurement result is directly influenced by factors such as fluctuation of a light source, transmission loss, aging of optical fibers, angle errors of a polarizer and an analyzer, photoelectric conversion errors and analog-to-digital conversion errors. (2) And (4) nonlinear measurement. The faraday rotation angle needs to be controlled within a very small angle (less than 1 degree) to achieve near linearity, resulting in a small dynamic measurement range. (3) The temperature drift problem. The temperature drift of the light source, the optical device, the photoelectric conversion device and the electronic device directly influences the emergent light intensity, and measurement errors are caused.
Disclosure of Invention
In view of this, an object of the present invention is to provide an optical current transformer implemented based on a strip-shaped radial polarization grating, which implements a detection mode independent of optical power, linear measurement and a large measurement range.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an optical current transformer based on bar radial polarization grating realizes which characterized in that: the device comprises a magnetic collecting ring, a light source, a first magnetic conduction plate, a second magnetic conduction plate, a light path, a CCD image sensor, a polarizer, a magneto-optical film and a strip-shaped radial polarization grating; the magnetic collecting ring is arranged on the outer side of the bus; the magnetic collecting ring is provided with an opening, and a first magnetic conduction plate and a second magnetic conduction plate are arranged in parallel in the opening; a light source is arranged on the upper side of the first magnetic conduction plate; a CCD image sensor is arranged on the lower side of the second magnetic conduction plate; the polarizer, the magneto-optical film and the strip-shaped radial polarization grating are sequentially arranged between the first magnetic conduction plate and the second magnetic conduction plate from top to bottom, and the first magnetic conduction plate and the second magnetic conduction plate are provided with through holes for light paths to pass through.
Further, the light source and the CCD image sensor are symmetrically arranged by taking the central line of the opening as an axis;
further, the method comprises the following steps:
step S1, current is supplied to the bus, and the magnetism collecting ring forms a uniform magnetic field between the first magnetic conduction plate and the second magnetic conduction plate;
step S2, the laser emitted by the light source passes through a polarizer to obtain linearly polarized light;
step S3, linearly polarized light passes through the magneto-optical film, the polarization plane rotates, enters the strip-shaped radial polarization grating to form strip-shaped light spots and is input to the CCD image sensor;
step S3, when the external magnetic field changes, the strip-shaped light spots synchronously shift and keep the original intensity distribution;
and step S4, analyzing and processing the light intensity image by the CCD image sensor to obtain the position of the maximum or minimum light intensity, and calculating the light spot displacement to obtain the current value to be measured.
Further, the linearly polarized light passing through the magneto-optical film generates a Faraday magneto-optical rotation angle under the action of a magnetic field, the Faraday magneto-optical rotation angle is in direct proportion to the current to be measured, and the strip-shaped radial polarization grating converts the linearly polarized light passing through the magneto-optical film into a light intensity distribution image. Linearly polarized light with a certain vibration and transmission direction consistent with that of the strip-shaped radial polarization grating can penetrate through the grating, and linearly polarized light vertical to the vibration and transmission direction can not penetrate through the grating, so that the transmission light intensity in a certain area of the strip-shaped radial polarization grating is reduced from maximum to minimum, and a strip-shaped light spot with a fixed shape is formed. And positioning the light spot image penetrating through the grating by using a CCD image sensor to obtain the size of the Faraday magnetic rotation angle and the current value to be measured.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has no correlation with the optical power, and the measurement result is more accurate.
2. The invention realizes linear measurement and has larger measurement range.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of a strip radial polarization grating in an embodiment of the present invention;
in the figure: the device comprises a bus 1, a magnetic collecting ring 2, a light source 3, a first magnetic conduction plate 4, a second magnetic conduction plate 5, an optical path 6, a CCD image sensor 7, a polarizer 8, a magneto-optical film 9 and a strip-shaped radial polarization grating 10.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1, the present invention provides an optical current transformer implemented based on a strip-shaped radial polarization grating, which is characterized in that: the device comprises a magnetic collecting ring 2, a light source 3, a first magnetic conduction plate 4, a second magnetic conduction plate 5, a light path 6, a CCD image sensor 7, a polarizer 8, a magneto-optical film 9 and a shaped radial polarization grating 10; the magnetic collecting ring 2 is arranged on the outer side of the bus 1; the magnetism collecting ring 2 is provided with an opening, and a first magnetic conduction plate 4 and a second magnetic conduction plate 5 are arranged in parallel at the opening; a light source 3 is arranged on the upper side of the first magnetic conduction plate 4; a CCD image sensor 7 is arranged on the lower side of the second magnetic conduction plate 5; the polarizer 8, the magneto-optical film 9 and the radial polarization grating 10 are sequentially arranged between the first magnetic conduction plate 4 and the second magnetic conduction plate 5 from top to bottom, and the first magnetic conduction plate 4 and the second magnetic conduction plate 5 are provided with through holes for the light path 6 to pass through.
In one embodiment of the present invention, when the bus bar 1 is electrified, the magnetism collecting ring 2 forms a uniform magnetic field between the first magnetic conduction plate 4 and the second magnetic conduction plate 5. The laser emitted by the light source 3 passes through the polarizer 8 to obtain linearly polarized light. Linearly polarized light passes through the magneto-optical film 9, the polarization plane rotates, and enters the strip-shaped radial polarization grating 10 to form a strip-shaped light spot, and the structure of the strip-shaped radial polarization grating is shown in figure 2. When the external magnetic field changes, the strip-shaped light spots synchronously shift and keep the original intensity distribution. The CCD image sensor 7 analyzes and processes the light intensity image to obtain the position of the maximum or minimum light intensity, and calculates the light spot displacement to obtain the current value to be measured. This measurement allows a linear measurement of the current with optical power independence.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (2)
1. The utility model provides an optical current transformer based on bar radial polarization grating realizes which characterized in that: the device comprises a magnetic collecting ring, a light source, a first magnetic conduction plate, a second magnetic conduction plate, a CCD image sensor, a polarizer, a magneto-optical film and a strip-shaped radial polarization grating; the magnetic collecting ring is arranged on the outer side of the bus; the magnetic collecting ring is provided with an opening, and a first magnetic conduction plate and a second magnetic conduction plate are arranged in parallel in the opening; a light source is arranged on the upper side of the first magnetic conduction plate; a CCD image sensor is arranged on the lower side of the second magnetic conduction plate; the light source and the CCD image sensor are symmetrically arranged by taking the opening center line as an axis.
2. The working method of the optical current transformer based on the strip-shaped radial polarization grating implementation is characterized by comprising the following steps of:
step S1, current is supplied to the bus, and the magnetism collecting ring forms a uniform magnetic field between the first magnetic conduction plate and the second magnetic conduction plate;
step S2, the laser emitted by the light source passes through a polarizer to obtain linearly polarized light;
step S3, linearly polarized light passes through the magneto-optical film, the polarization plane rotates, enters the strip-shaped radial polarization grating to form strip-shaped light spots and is input to the CCD image sensor;
step S4, when the external magnetic field changes, the strip-shaped light spots synchronously shift and keep the original intensity distribution;
and step S5, analyzing and processing the light intensity image by the CCD image sensor to obtain the position of the maximum or minimum light intensity, and calculating the light spot displacement to obtain the current value to be measured.
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| CN201810776271.4A CN108872681B (en) | 2018-07-16 | 2018-07-16 | Optical current transformer realized based on strip-shaped radial polarization grating |
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| CN201810776271.4A CN108872681B (en) | 2018-07-16 | 2018-07-16 | Optical current transformer realized based on strip-shaped radial polarization grating |
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| CN108872681B true CN108872681B (en) | 2020-11-10 |
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| CN109521245A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on combination half-wave plate |
| CN109521244A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on S wave plate |
| CN109669065A (en) * | 2018-12-11 | 2019-04-23 | 龙岩学院 | The voltage measurement method realized based on bar shaped radial polarisation grating |
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