Noninvasive measuring method for rapid temperature variation under DC excitation magnetic field

US9958342B2 · kind B2 · utility

Assignee

• Huazhong University of Science and Technology · CN

Inventors

• Wenzhong Liu · 红钢城街道, CN
• Pu Zhang · Ann Arbor, US
• Chuliang Ruan · 红钢城街道, CN
• Wenbiao Xu · 红钢城街道, CN

Key dates

• Filing date: Sep 11, 2014
• Grant date: May 1, 2018
• Expiry date: Jul 25, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/0213
• WIPO field: Measurement
• WIPO sector: Instruments

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.