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A calibration-free optical current sensor and method based on dual probes

A current sensor, calibration-free technology, applied in the direction of voltage/current isolation, measuring current/voltage, instruments, etc., to achieve the effect of simple installation and operation, convenient hanging network, and low requirements for the use environment

Inactive Publication Date: 2017-02-22
陈 国梁 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A calibration-free optical current sensor and method based on dual probes
  • A calibration-free optical current sensor and method based on dual probes
  • A calibration-free optical current sensor and method based on dual probes

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Embodiment

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

[0057] image 3 Schematic diagram 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], a polarizer [12], fiber collimator [13] and guiding fiber [14]. The light emitted by the light source [9] passes through the polarizer [10], the magneto-optical material [11], the analyzer [12] and the fiber collimator [13] and enters the conduction light [14] from one end, and the conduction fiber [14] The other end is used as the output end of the sensing head [5], [6].

[0058] Place the sensor near the current-carrying wire [1], make the fixed 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 a calibration-free optical current sensor and method based on double probes, belonging to the technical field of electrical measurement and calibration. Background technique [0002] Magneto-optical current sensors have been researched for decades, 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 precision, 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, position, and external magnetic field, resulting in a decrease in sensor accuracy. Especially affected by the distance from the wire to be tested to the sensor, for different wires and different use environments, separate calibration and on-site calibration of the sensor...

Claims

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Application Information

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Patent Type & Authority Patents(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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