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Radial analyzer type magneto-optical film current sensor

A technology of current sensors and polarizers, applied in the direction of voltage/current isolation, measurement using digital measurement technology, etc., can solve nonlinear, small signal and non-periodic components can not respond effectively, measurement range and accuracy limitations, etc. question

Inactive Publication Date: 2014-03-26
徐启峰
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Problems solved by technology

The advantage is that the electrical isolation between high and low potentials is realized by the transmission of optical signals; the disadvantage is that the method of measuring light intensity is nonlinear, which limits the range and accuracy of the measurement, and is severely affected by temperature drift and line birefringence effects. influences
[0005] The air-core coil electronic type has no iron core, so there is no magnetic saturation problem, but the disadvantage is that it cannot respond effectively to small signals and non-periodic components
High-potential electronic circuits have problems of difficult maintenance, poor reliability and stability

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  • Radial analyzer type magneto-optical film current sensor
  • Radial analyzer type magneto-optical film current sensor
  • Radial analyzer type magneto-optical film current sensor

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Embodiment Construction

[0012] The specific implementation is as attached figure 2 As shown, the optical signal [1] is transmitted from the low potential to the high potential reflective prism [3] through the transmission fiber [2], then enters the polarizer [4] to obtain linearly polarized light, and then enters the magneto-optic film [5], carrying The magnetic field generated by the current in the current wire [10] acts on [5] through the air gap of the magnetic collecting ring [9]. The optical rotation angle is proportional to the magnitude of the current. The linearly polarized light emitted from [5] is demodulated by the radial analyzer [6] to obtain a spot that rotates synchronously with the optical rotation angle. Like the optical fiber bundle [7], the light spot is transmitted to the low-potential CMOS / CCD image sensor [8], and the real-time digital quantity of the current in [10] is obtained by [8] positioning the light spot. Wherein [3], [4], [5], [6] are all placed in the air gap of [9],...

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Abstract

The invention relates to a radial analyzer type magneto-optical film current sensor. A fundamental principle adopted is the Faraday magneto optical effect based on which the plane of polarization of a magneto-optical film can rotate under the action of a current magnetic field when linearly polarized light permeates the magneto-optical film, a radial analyzer is adopted for demodulation, an image transmission rod or an image transmission optical fiber bundle is adopted for image transmission, and a digital image positioning method is adopted for directly measuring the rotation angle of the plane of polarization, so that the real-time digital current signals can be obtained. The current sensor is suitable for measuring AC / DC of electric power systems.

Description

technical field [0001] The invention relates to a radial polarization detector magneto-optical film current sensor, the basic principle of which is based on the Faraday magneto-optic effect so that when linearly polarized light passes through the magneto-optic film, its polarization plane rotates under the action of the current magnetic field. The demodulation of the polarizer, the image transmission of the image transmission rod or the image transmission fiber bundle, and the digital image positioning method directly measure the rotation angle of the polarization plane and obtain real-time digital current signals. It is suitable for AC and DC current measurement of power system. Background technique [0002] Current transformers or current sensors used in power systems include electromagnetic type based on Faraday's electromagnetic induction principle, analog magneto-optical type based on Faraday's magnetic rotation-optical effect, and air-core coil electronic type. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/24G01R19/25
Inventor 徐启峰
Owner 徐启峰
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