Faraday current and temperature sensors

A technology of current sensor and temperature sensor, which is applied in thermometers, measuring current/voltage, voltage/current isolation, etc., and can solve the problems of electronic circuits requiring power and influence

Active Publication Date: 2015-04-29
姚晓天
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electronic circuits often require power and can be adversely affected by electromagnetic interference
The various electronic circuits used to sense the current need to be located where the current is measured and this can impose practical limitations in various applications

Method used

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  • Faraday current and temperature sensors
  • Faraday current and temperature sensors
  • Faraday current and temperature sensors

Examples

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Embodiment Construction

[0023] Current sensing based on fiber optic current sensors is attractive for monitoring, control and protection of transformers and power distribution systems in smart grids. Compared to some existing current sensors, it has the advantage of being able to separate the sensor head from the electronic processing unit at different locations, and thus does not require any power at the sensor head, making it safe for high voltage applications. Embodiments of the fiber optic current sensor can be configured to achieve other advantages, including small size, light weight, immunity to electromagnetic interference, low power consumption, immunity to current saturation, or other effects. Fiber optic coil-based current sensors using the Faraday effect in the fiber have been widely used in high voltage applications, where the fiber optic coil is wound around a current-carrying conductor. Such fiber optic coil based current sensors are generally more expensive and require cable breakage t...

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Abstract

This patent application discloses techniques and devices for sensing or measuring electric currents and/or temperature based on photonic sensing techniques. An optical current sensor head is located near or at a current-carrying conductor so that a magnetic field associated with the current is present at a Faraday material and the optical detection unit detects the light from the Faraday material to determine a magnitude of the current. An optical temperature sensor head is located near or at a location so that the temperature at a temperature-sensing Faraday material is reflected by the optical polarization rotation which is detected to determine the temperature.

Description

[0001] CROSS-REFERENCE TO PRIORITY AND RELATED APPLICATIONS [0002] This patent document claims the benefit of US Provisional Patent Application Serial No. 61 / 887,897, entitled "Compact Faraday Current Sensor," filed October 7, 2013. The entire contents of the above-mentioned patent applications are hereby incorporated by reference as part of the disclosure content of the present application. technical field [0003] This patent application relates to techniques and devices for sensing current and temperature. Background technique [0004] A current is an electrical signal produced by the flow of charge within a conductive path, such as a metal. Considering the electrical nature of current, techniques and devices for sensing or measuring current are mostly based on electronic circuits. Electronic circuits generally require power and can be adversely affected by electromagnetic interference. The various electronic circuits used to sense the current need to be located wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24G01K11/32
CPCG01R15/246G01K11/00G01K11/32
Inventor 姚晓天
Owner 姚晓天
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