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1. CN106483480 - Single-probe biological magnetic field detection method, circuit and sensor based on GMI effects

Office China
Application Number 102016000849945
Application Date 26.09.2016
Publication Number 106483480
Publication Date 08.03.2017
Grant Number 106483480
Grant Date 25.06.2019
Publication Kind B
IPC
G01R 33/09
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
02Measuring direction or magnitude of magnetic fields or magnetic flux
06using galvano-magnetic devices
09Magneto-resistive devices
CPC
G01R 33/093
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
02Measuring direction or magnitude of magnetic fields or magnetic flux
06using galvano-magnetic devices, e.g. Hall effect devices; using magneto-resistive devices
09Magnetoresistive devices
093using multilayer structures, e.g. giant magnetoresistance sensors
Applicants NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY, PLA
中国人民解放军国防科学技术大学
Inventors ZHOU ZONGTAN
周宗潭
HU DEWEN
胡德文
WANG ZHIHUA
王志华
XU MING
徐明
GUO SHANCI
郭善磁
Agents 湖南兆弘专利事务所(普通合伙) 43008
湖南兆弘专利事务所(普通合伙) 43008
Title
(EN) Single-probe biological magnetic field detection method, circuit and sensor based on GMI effects
(ZH) 基于GMI效应的单探头生物磁场探测方法、电路及传感器
Abstract
(EN)
The invention discloses a single-probe biological magnetic field detection method, a circuit and a sensor based on GMI effects. The method comprises steps: output signals of an amorphous wire GMI probe are divided into two independent and non-interference paths; after low pass filters with different cut-off frequencies are adopted respectively for filtering, differential amplification is then carried out to obtain biological magnetic field detection signals. The circuit comprises an isolation circuit, a first low pass filter unit, a second low pass filter unit and a differential amplification unit. The sensor comprises the amorphous wire GMI probe and the above circuit. Through isolating and separating sensing signals outputted by the single amorphous wire GMI probe into two paths of independently-processed signals for low pass filtering processing and differential amplification, interference from a uniform magnetic field in the environment can be eliminated, a role of high-frequency filter preposition is played, conformance requirements of the amorphous wire material does not need to be considered, miniaturization and integration are facilitated, and the adaptability is good.

(ZH)
本发明公开了基于GMI效应的单探头生物磁场探测方法、电路及传感器,方法步骤包括将非晶丝GMI探头的输出信号分为独立且互不干扰的两路并分别采用截止频率不同的低通滤波器滤波后,再进行差分放大得到生物磁场探测信号;电路包括隔离电路、第一低通滤波单元、第二低通滤波单元和差分放大单元;传感器包括非晶丝GMI探头和前述电路。本发明将单个非晶丝GMI探头输出的感应信号隔离分离变成两路可独立处理的信号分别进行低通滤波处理后差分放大,能够排除环境中均一磁场的干扰、起到高频滤波前置的作用,不需要考虑非晶丝材料一致性要求,便于微型化、集成化,具有适应性好的优点。