Magnetic field measuring device and measuring method of a magnetic element

Abstract

The invention discloses a magnetic-field measuring device and method for magnetic components. The magnetic-field measuring device comprises a magnetic sensing probe, a measuring circuit, a range adjusting mechanism and an auxiliary circuit; the magnetic sensing probe is composed of a first magnetic sensor and a second magnetic sensor and is used for acquiring magnetic signals; the measuring circuit is composed of a driving chip and a microprocessor and is used for converting and processing the magnetic signals; the range adjusting mechanism is composed of a guide groove, a sliding rod and a reset spring and is used for changing the magnetic sensing probe in position. The magnetic components are accurately measured in an open space by eliminating influences of magnetic field through differential, the probe can be adjusted in position through a mechanical structure, and the measuring range can be expanded in matching with the arithmetical processing. The magnetic-field measuring device has the advantages of high precision, good operability, freeness of geomagnetic field interference, less prone to damage to the probe, easiness in maintenance, high cost performance and the like.

Description

technical field [0001] The invention relates to a magnetic field measuring device and a measuring method of a magnetic element, which are used for detecting the magnetic field intensity of the magnetic element. Background technique [0002] The observation and utilization of magnetic phenomena is one of the oldest technological fields of mankind. As far back as the third century BC, the ancients used the magnetic compass and later used it in navigation. In recent years, with the rapid development of the electronics industry, the application of various magnetic materials and magnetic devices has become more and more common, and higher requirements have been put forward for the measurement accuracy of weak magnetic fields. At present, according to the working principle of the sensitive components of the measurement system, there are mainly Hall elements, fluxgate sensors, magnetoresistive sensors, giant magnetoresistive sensors, etc. Based on the above-mentioned magnetic sen...

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Problems solved by technology

For example, the LZ-860 gauss meter with a price of up to 10,000 yuan can measure DC and AC magnetic fields, but the highest resolution is only 10uT

In addition, because the Hall element itself generates a large amount of heat and is sensitive to temperature, it is usually necessary to add hardware to keep the Hall element at a constant temperature. At the same time, the software needs to perform nonlinear error correction, display value correction, peak hold, Software zero adjustment, etc., the system design is complex, the measurement accuracy is not high, and the price is expensive

[0004] 2. Although the sensor system designed based on fluxgate, anisotropic magnetoresistance and giant magnetoresistance has high precision, the measurement range is not large (usually only a few tens of uT), and additional complex amplifier circuits are required (generally To amplify hundreds to thousands of times) and filter feedback circuit, and even set / reset circuit to improve measurement accuracy, resulting in complex system structure, large size, high power consumption, expensive, and its application is limited

[0005] So far, the accuracy of gauss meters used for magnetic field measurement of magnetic components is mostly at the level of 0.01mT. For measuring the magnetic field strength of some small magnetic components, the accuracy is not high, and it is easily disturbed by the earth’s magnetic field.

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