Dual probe-based calibration-free optical current sensor and method

Abstract

The invention discloses a dual probe-based calibration-free optical current sensor and a method. The sensor is composed of two magneto optical current sensing heads, a sensing head fixing support and a measuring unit. According to the method, as the sensing head fixing support is adopted, the relative distance of the two sensing head can be ensured to be fixed and is not influenced by temperature, stress and other environmental disturbance. The measuring unit receives output light intensity of the two magneto optical current sensing heads and the output light intensity is converted into electrical signals and an output measurement current value is calculated. Through demodulating the measurement values of the sensing heads, influences of the distance in relative to a cable lead on the measuring result in the case of installation can be directly eliminated, and the difficulty that power needs to be on for calibration in the case of onsite installation of the sensor can be avoided.

Description

Technical field [0001] The invention relates to an optical current sensor and method based on double probe calibration-free, belonging to the technical field of electrical measurement and calibration. Background technique [0002] Magneto-optical current sensors have been researched for decades now, and many domestic and foreign manufacturers have launched their own products. Compared with traditional current sensors, magneto-optical current sensors have many advantages such as high safety, high accuracy, and wide measurement range, but they have not been fully promoted in practical applications so far. The reason is that the current optical current sensor is affected by many factors such as temperature, time, location, external magnetic field, etc., causing the accuracy of the sensor to decrease. Especially affected by the distance between the wire to be measured and the sensor, for different wires and different use environments, the sensors need to be individually calibrated a...

AI Technical Summary

Problems solved by technology

[0016] Compared with traditional current sensors, magneto-optical current sensors have good electrical insulation, are not affected by electromagnetic radiation, have strong anti-interference ability, and have many advantages such as fast frequency response. However, based on the Faraday effect, the measurement of magneto-optical current sensors The value is related to the distance from the sensor to the energized wire, so individual differences and installation differences of the measurement wires and position changes caused by the external environment during long-term use will cause measurement differences

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