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Optical fiber DC magneto-optic detection system and method

By using the reference magnetic field pulse signal in the fiber optic DC magneto-optical detection system for real-time correction, the accuracy problem of DC current measurement in the fiber optic magneto-optical measurement system is solved, and the effects of high precision and safe isolation are achieved.

Inactive Publication Date: 2010-07-07
SIEYUAN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the measured magnetic field H is a DC signal, the above method will not be able to remove I 0 , resulting in inaccurate measurement results
[0008] At the same time, the inventors found in the process of realizing the present invention that the application of various materials for magneto-optical measurement will be affected by environmental factors such as temperature and stress or the strength of the measured magnetic field, and these effects will lead to inaccurate measurement
In particular, the inventors found that the microscopic magnetic domains of materials such as garnet magneto-optic crystals will produce irregular disturbances under the action of a certain strength of DC or alternating external magnetic field, which will affect the optical properties and cause uncertainty in the measurement.
Moreover, no reasonable solutions have been proposed for these problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 2 As shown, the present embodiment provides a fiber optic direct current magneto-optical detection system, which system includes: a magneto-optical probe 100, an optical fiber device 200, a reference device 300 and a power supply and a signal processing module 400, wherein the magneto-optic probe 100 and the reference device 300 is placed around the measurement point, the position of the measurement point may be a high potential, the power supply and signal processing module 400 are placed in a safe place near the ground with low potential, and they are connected by an electrically insulating conductive optical fiber device 200;

[0031] The power supply and signal processing module 400 is used for sending laser light to the magneto-optical probe 100 through the optical fiber device 200; It is two-way electrical signals, and the two-way electrical signals are processed according to the reference magnetic field pulse signal sent by the reference device 30...

Embodiment 2

[0038] see image 3 , the present embodiment provides a fiber optic DC magneto-optical detection system, the system includes: a magneto-optical probe 100, an optical fiber device 200, a reference device 300 and a power supply and signal processing module 400, wherein the magneto-optical probe 100 and the reference device 300 are As for the surroundings of the measurement point, the location of the measurement point may be of high potential, and the power supply and signal processing module 400 are placed in a safe place near the ground with low potential, and they are connected by an electrically insulating conductive optical fiber device 200;

[0039] Wherein, the power supply and signal processing module 400 includes at least a laser 41, photodetectors 42a and 42b, and a control and signal processing module 44;

[0040] The laser 41 is used to send laser light to the magneto-optical probe 100 through the optical fiber device 200;

[0041] Two photodetectors 42a and 42b are us...

Embodiment 3

[0060] see Figure 5 , the present embodiment provides a fiber optic DC magneto-optical detection system, the system includes: two magneto-optical probes 100a and 100b, an optical fiber device 200, a reference device 300 and a power supply and signal processing module 400, wherein the magneto-optical probe 100a and 100b. The reference device 300 is placed around the measuring point (for example: a current-carrying conductor) 800. The position of the measuring point 800 may be at a high potential. Electrically isolated conductive fiber optic device 200 connection;

[0061] The power supply and signal processing module 400 in the present embodiment comprises: two lasers 41a and 41b; Reference laser 43; Photodetector 42a, 42b, 42c and 42d; Control and signal processing module 44; Reference laser 43 can be according to control and signal The instructions of the processing module 44 emit a reference laser light of a specified intensity and shape at a specified time. The specified...

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Abstract

The invention provides an optical fiber DC magneto-optic detection system and a method, belonging to the field of optical application. The system comprises a power supply, a signal processing module, an optical fiber device, a magneto-optic probe and a reference device. Since the reference device is arranged in the system, the measured signal can be corrected by the reference magnetic field pulsesignal generated by the reference device, so that the influence of environmental factors on the measurement can be eliminated, accurate measurement data are obtained and the measurement accuracy of the system is improved.

Description

technical field [0001] The invention relates to the field of optical applications, in particular to an optical fiber DC magneto-optical detection system and method. Background technique [0002] Due to the advantages of large capacity, high transmission efficiency, and low electromagnetic radiation, DC transmission has begun to be valued in the modern new generation of energy transmission. Due to the DC transmission, the current on the transmission line cannot be measured by a transformer using electromagnetic induction, and how to measure the DC current has become a technical problem. Some people use the Hall effect to measure DC current, but its sensitivity is low, the equipment cost is high, and it is difficult to perform high-voltage insulation. [0003] At present, magneto-optical effects such as the Faraday effect are widely used in the measurement of current and magnetic field. The Faraday effect can be realized by materials such as magneto-optic glass, magneto-opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G01R19/00
CPCG01R15/245G01R15/246G01R33/032G01R19/00G01R15/24G01R33/0322G02F1/09H01P1/175
Owner SIEYUAN ELECTRIC CO LTD