Method and device for hysteresis loop measurement based on digital integration

A technology of hysteresis loop and digital integration, applied in hysteresis curve measurement, magnetic performance measurement, etc., can solve problems such as measurement system drift, and achieve overcoming measurement system drift, zero drift, good repeatability and closure. Effect

Inactive Publication Date: 2013-01-16
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially to overcome the existence of factors such as the leakage of the existing integrating capacitor, which will lead to the drift problem of the measurement system

Method used

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  • Method and device for hysteresis loop measurement based on digital integration
  • Method and device for hysteresis loop measurement based on digital integration
  • Method and device for hysteresis loop measurement based on digital integration

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] The basic circuit composition of the R-C active integrator is as follows (see figure 2 ): figure 2 R-C active integrator In the figure, R is the integral resistor, C is the integral capacitor, V 0 output for the integral.

[0031] The output-input relationship is:

[0032] V 0 =-1 / RC×∫e i dt=-φ / RC…(5)

[0033] e in formula (5) i That is, the induced voltage generated by the flux change, V 0 Output voltage for the R-C active integrator. The value of magnetic flux Φ is obtained through correction, and then the data of B=φ / NS is obtained.

[0034] The present invention designs digital integrator by embedded microprocessor and software technology, and principle is as follows:

[0035] (1) can be transformed into:

[0036] Φ=-∑e i Δt (Δt is very small)...(6)

[0037] which is:

[0038] Φ=-(e 1 Δt+e 2 Δt+…+e n Δt+...)...(7)

[0039] Digital integrator implementation principle available image 3 express:

[0040] The present invention utilizes the Raida cr...

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Abstract

The invention discloses a method for hysteresis loop measurement based on digital integration. An R-C (resistance-capacitance) active integrator is used for measuring a hysteresis loop of a magnetic material, and an R-C active circuit is subjected to analog-digital conversion, filtering and accumulation to obtain an integral induced voltage Ei in direct proportion to phi. The method includes the steps: after the induction potential ei generated by measurement changes of magnetic-flux in the magnetic material caused by an external magnetic field H of the magnetic material is amplified by an auto-zero amplifier, outputting integral induced voltage Ei within a period of time; using a high-speed A/D conversion module for converting analog signals of Ei into digital signals, performing A/D conversion for N times within a set timer delta t, and accumulating sigma Ei; obtaining a magnetic flux within delta t according to the equation that phi i=Ei X delta t; and subjecting all phi within the measurement period to arithmetic operation to obtain the magnetic flux of the external magnetic H of a corresponding tested sample. Hysteresis loop graphs of magnetic material materials have high reproducibility and closing performance.

Description

1. Technical field [0001] The invention relates to a digital integral hysteresis loop measuring method and device. 2. Background technology [0002] Magnetic matter is a kind of material with specific performance and wide application. The study of magnetic properties of matter is one of the important fields of material physics. It has been found that when the magnetic material reaches point b along the magnetization curve oab, the magnetic induction B of the magnetic material cannot continue to increase even if the external magnetic field H is continuously increased. At this time, the corresponding magnetic induction is the saturation magnetic induction Bm of the magnetic material. After that, the magnetic field B inside the magnetic material will decrease with the decrease of the external magnetic field H, but not along the trajectory of the magnetization curve oab. When the external magnetic field H returns to 0, the magnetic induction intensity B=Br is still maintained i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/14
Inventor 徐顺利
Owner NANJING UNIV
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