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Low-intensity magnetic field gradient measuring device and method

A measuring device and a technology for magnetic field gradients are applied in the field of devices for measuring weak magnetic field gradients to achieve the effects of convenient use, reliable circuit and low cost

Inactive Publication Date: 2007-12-19
蹇兴亮
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a portable magnetic field gradient measurement device with simple structure, low price, flexible use and high sensitivity. Differential noise, more accurate detection of defects or stress concentration, the measurement device does not need to measure the exact value of the magnetic field strength

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[0015] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0016] The weak magnetic field gradient measurement device of the present invention adopts the principle of autocorrelation detection. Figure 1 is a block diagram of the system composition of the device. The 33.3Hz sine wave signal generated by the D / A component of the single-chip microcomputer is sent to the boost drive circuit in Figure 3 for amplification. Usually the signal is amplified to a peak-to-peak value of about 30V. The AC signal passes through the piezoelectric bimorph lead 2 to make the piezoelectric bimorph 5 work. That is, vibration drives the integrated linear Hall element mounted on the free end to perform simple resonance. The vibration direction is perpendicular to the normal direction of the Hall element detection surface 8. The center of the Hall element is in the plane where the piezoelectric bimorph is located. Bend the pin 7 of the Ha...

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Abstract

A method for measuring gradient of weak magnetic field includes utilizing self-correlation technique to modulate static magnetic field distribution to be weak AC signal output of constant frequency through vibration of transducer, amplifying said weak signal by frequency-selection amplification circuit, carrying out A / D conversion and self-correlation operation by monolithic computer to calculate out signal peak-peak value voltage being direct-ratio to gradient of measured magnetic field. The device used for realizing said method is also disclosed.

Description

Technical field [0001] The invention relates to the measurement technology of magnetic field parameters, and more specifically, it relates to a device and method for measuring the gradient of a weak magnetic field. Background technique [0002] The method of measuring the magnetic field gradient is generally to measure the magnetic field strength of two points in space and the distance between the two points, and then subtract the magnetic field strength of the two points and divide by the distance to obtain the magnetic field gradient along the line where the two points are located. This method must first measure the magnetic field strength, and the instrument for measuring the weak magnetic field strength includes a DC amplifier circuit, which inevitably introduces low-frequency flicker noise or called 1 / f noise, which will inevitably limit the gain of the amplifier circuit Improve and reduce the sensitivity of magnetic field gradient measurement. The magnetic field measuring d...

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Application Information

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IPC IPC(8): G01R33/022
Inventor 蹇兴亮周克印
Owner 蹇兴亮
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