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Environment temperature compensation heavy current measurement system based on fiber polarization detection

A technology of ambient temperature and measurement system, applied in the direction of measuring current/voltage, measuring device, measuring electric variable, etc., can solve the problems that fiber optic current transformers are difficult to form batches and large-scale production, and achieve simple structure, low cost, The effect of safety improvement

Inactive Publication Date: 2012-07-18
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, due to the fact that the influence of temperature on the detection current based on the optical fiber polarization state is difficult to avoid and compensate, it is still difficult to form a batch and large-scale production of fiber-optic current transformers.

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  • Environment temperature compensation heavy current measurement system based on fiber polarization detection
  • Environment temperature compensation heavy current measurement system based on fiber polarization detection
  • Environment temperature compensation heavy current measurement system based on fiber polarization detection

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Embodiment Construction

[0011] Such as figure 1 The schematic diagram of the optical fiber polarization current sensing system is shown. Under the action of the magnetic field, the material that originally does not have optical activity also produces optical activity (the light vector rotates). This phenomenon is called the magneto-optical rotation effect or the Faraday effect. rotation vector = , assuming that the optical rotation ability of the substance is ρ, then = . When light passes through a substance, the optical path is l When , the rotation angle of the light polarization plane for: = l= l=V l, where V= , V is called the Verdet constant, which is related to the nature of matter, temperature and the frequency (wavelength) of light. The physical meaning is the rotation angle per unit optical path per unit field intensity.

[0012] When linearly polarized light passes through a magneto-optical material, its polarization plane will rotate under the action of the magnetic...

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Abstract

The invention relates to an environment temperature compensation heavy current measurement system based on fiber polarization detection. Through carrying out real-time measurement on environment temperature, setting a polarization controller, and inputting an optical signal and a temperature signal in the polarization controller simultaneously, a temperature change signal is compensated in the polarization controller, thus the optical signal always maintains linear polarization at a controller output terminal (a fiber which detects current), influence of temperature change on polarization change of light is avoided, influence of the temperature change on a current detection result is avoided, and measurement accuracy of the system is raised. According to the invention, a structure is simple, a requirement of an insulation device is not high, compared with a traditional test system, a dimension becomes smaller, and cost is low. A magneto-optical effect principle is employed, thus a dynamic scope is very large, reaction rate is high, and a non-saturation test of heavy current can be realized. By employing the fiber as a sensor, long distance transmission of data can be realized, and security is raised greatly.

Description

technical field [0001] The invention relates to a grid current detection technology, in particular to an ambient temperature compensation large current measurement system based on optical fiber polarization state detection. Background technique [0002] Smart grid is a strategic concept involving multiple technical fields. The development of smart grid must be guided by measurement technology, equipment technology as support, control technology as method, and supporting technology. Among them, the current is an important parameter that needs to be detected in the smart grid, and the current sensor has become one of the most important instruments in the smart grid. The large current detection technology is the key to the realization of the smart grid. The high-current detection system uses the Faraday effect of the optical fiber. Due to the Faraday effect, the current generates a magnetic field, and the magnetic field affects the polarization state. The instrument obtains the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/32G01R19/00
Inventor 张学典毛辰飞张振一侯英龙鲁敦科冯舒宁
Owner UNIV OF SHANGHAI FOR SCI & TECH
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