公开(公告)号：US09958342B2

公开(公告)日：2018-05-01

申请号：US14766111

申请日：2014-09-11

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Wenzhong Liu ,  Pu Zhang ,  Chuliang Ruan ,  Wenbiao Xu

IPC: G01K7/38 ,  G01K7/36 ,  G01R33/02

CPC classification number: G01K7/38 ,  G01K7/36 ,  G01R33/0213

Abstract: Provided is a noninvasive measuring method for rapid temperature variation under a DC excitation magnetic field, comprising: (1) positioning ferromagnetic particles at a measured object; (2) applying a DC magnetic field to area of the ferromagnetic particles enabling the ferromagnetic particles to reach saturation magnetization state; (3) obtaining steady temperature T1 of the measured object at room temperature, and calculating initial spontaneous magnetization M1, of the ferromagnetic particles according to the steady temperature T1; (4) detecting amplitude A of a magnetization variation signal of the ferromagnetic particles after temperature of the measured object varies, and calculating temperature T2 after change according to the amplitude A of the magnetization variation signal; and (5) calculating temperature variation ΔT=T2-T1 according to the temperature T2 after change and the steady temperature T1. The present invention can realize noninvasive temperature measurement with high speed and high accuracy so as to resolve technical problems of low speed and low precision.