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

A current sensor, calibration-free technology, applied in the direction of voltage/current isolation, current/voltage measurement, instruments, etc., to achieve the effect of low environmental requirements, simple installation and operation, and convenient network connection

Inactive Publication Date: 2014-10-01
陈 国梁 +2
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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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Embodiment

[0056] Such as figure 2 As shown, the magneto-optical current sensor with automatic distance calibration of the present invention consists of two magneto-optical current sensing heads [5] and [6], a fixed bracket [7] and a measuring unit [8].

[0057] image 3 It is a schematic diagram of the structure of the sensor head [5], [6]. The magneto-optical sensor head [5], [6] consists of a light source [9], a polarizer [10], a magneto-optical material [11], and an analyzer. [12], fiber collimator [13] and conductive fiber [14]. The light from the light source [9] passes through the polarizer [10], the magneto-optical material [11], the analyzer [12] and the fiber collimator [13] into the conductive light [14] from one end, and the conductive fiber [14] The other end is used as the output end of the sensor head [5], [6].

[0058] Place the sensor near the current-carrying wire [1], make the fixing bracket [7] point to the current-carrying wire [1], and make the magneto-optical materia...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/24G01R19/00
Inventor 张先明陈国梁顾春梅理许立新王安廷
Owner 陈 国梁
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