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1. CN102854535 - Broadband magnetic sensor

Office China
Application Number 201210303941.3
Application Date 24.08.2012
Publication Number 102854535
Publication Date 02.01.2013
Grant Number
Grant Date 11.03.2015
Publication Kind B
IPC
G01V 3/10
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
08operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
10using induction coils
Applicants 722 Research Institute of China Shipbuilding Industry Corporation
Inventors Zhou Zhiyu
Fan Yubing
Li Wenbin
Liu Mourong
Agents fang fang
Title
(EN) Broadband magnetic sensor
(ZH) 一种宽带磁性传感器
Abstract
(EN)
The invention discloses a broadband magnetic sensor, belongs to an inductive magnetic sensor and solves the problem that the conventional magnetic sensor has extremely high noise in an extremely low frequency band. The broadband magnetic sensor comprises an induction coil, a high-frequency channel amplification circuit, a low-frequency channel amplification circuit, a low-pass filter, an operational amplifier, a voltage follower and a feedback circuit, wherein an output signal of the induction coil is respectively transmitted to the high-frequency channel amplification circuit and the low-frequency channel amplification circuit; the output end of the high-frequency channel amplification circuit is connected with a first switch; the output end of the low-frequency channel amplification circuit is connected with a second switch through the low-pass filter; central contacts of the first switch and the second switch are respectively connected with an inverse phase input end of the low-pass filter through a first input resistor and a second input resistor; and the output end of the operational amplifier is connected with the voltage follower and is connected with an induction signal input end of the induction coil through the feedback circuit. According to the broadband magnetic sensor, the low noise is amplified in the extremely low frequency band, the broadband magnetic sensor has flat amplitude-frequency characteristics and linear phase in wider frequency domains on two sides of the resonant frequency of the induction coil, and the application frequency range of the magnetic sensor is greatly widened.

(ZH)

一种宽带磁性传感器,属于感应式磁传感器,解决现有磁传感器在极低频段噪声过大的问题。本发明包括感应线圈、高频通道放大电路、低频通道放大电路、低通滤波器、运算放大器、电压跟随器和反馈电路,感应线圈输出信号分别送到高、低频通道放大电路,高频通道放大电路输出端连接第一开关;低频通道放大电路输出端通过低通滤波器连接第二开关;第一、第二开关中心触点分别通过第一、第二输入电阻连接运算放大器反相输入端,运算放大器输出端连接电压跟随器,并通过反馈电路连接感应线圈的感应信号输入端。本发明实现了在极低频段的低噪声放大,在感应线圈谐振频率两侧较宽频域具有平坦的幅频特性及线性相位,极大拓展了磁传感器应用频率范围。