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1. CN102147482 - Invention of inductive magnetic sensor used for superficial layer CSAMT (controlled source acoustic magnetotelluric) method

Office China
Application Number 201010106655.9
Application Date 05.02.2010
Publication Number 102147482
Publication Date 10.08.2011
Publication Kind A
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 Zhu Wanhua
朱万华
Inventors Zhu Wanhua
朱万华
Agents
Title
(EN) Invention of inductive magnetic sensor used for superficial layer CSAMT (controlled source acoustic magnetotelluric) method
(ZH) 一种用于浅层CSAMT方法的感应式磁传感器的发明
Abstract
(EN)
The invention relates to an inductive magnetic sensor used for a superficial layer CSAMT (controlled source acoustic magnetotelluric) method, which solves the problem of collection of magnetic field signals in a CSAMT observation method with working frequency of 10KHz to 100KHz. Multiple circles of enameled wire coils are wound on a long and thin magnetic core with high magnetic conductivity so as to induce the magnetic field signals to be tested and send inductive signals to a low noise amplifier for signaling, thereby obtaining voltage signals in an observable range. The whole sensor is realized in a magnetic current negative feedback mode. The magnetic current negative feedback feeds output signals back to an input in modes of a feedback resistor and a secondary coil so as to increase the working bandwidth of the coil and enhance temperature stability and mechanical stability of a system. The practice proves that the inductive magnetic sensor has the advantages of low noise, flat response functions and the like and is suitable for CSAMT engineering application.

(ZH)

本发明实现了一种用于浅层CSAMT方法的感应式磁传感器,解决了工作频率在10KHz~100KHz的CSAMT观测方法中的磁场信号的收集。本发明采用了在高磁导率细长磁芯上缠绕多匝漆包线线圈感应待测磁场信号,并将感应信号送入低噪声放大器进行信号,达到可观测范围的电压信号。整个传感器采用磁流负反馈形式实现。磁流负反馈是将输出信号通过反馈电阻与次线圈的方式反馈到输入,以增大线圈的工作带宽,增强系统的温度稳定性、机械稳定性。实践证明本发明中的感应式磁场传感器具有噪声低、响应函数平坦等优点,适合CSAMT的工程运用。