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Low temperature squid transient electromagnetic receiver system

A receiver and electromagnetic technology, applied in radio wave measurement systems, using superconducting devices for magnetic field measurement, instruments, etc., can solve the problem of not being able to detect secondary fields

Active Publication Date: 2008-06-11
盎格鲁企业服务南非(控股)有限公司
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Problems solved by technology

Thus, it is evident from Fig. 1 that, corresponding to the response of the dotted line 16, no detection occurs at time t 1 Subsequent field

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  • Low temperature squid transient electromagnetic receiver system

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Embodiment Construction

[0029] Referring to the drawings, a receiver system 18 for use in an electromagnetic system according to the invention includes a first sensor 20 which is more sensitive, and a second sensor 22 which is less sensitive than the first sensor 20 . Typically, the second sensor 22 is about 10 times less sensitive than the first sensor 20 in order to provide a greater dynamic slew rate than the first sensor.

[0030] Each sensor 20, 22 includes three mutually orthogonal magnetometers 24A, 24B and 24C, and 26A, 26B and 26C, respectively.

[0031] Preferably, the sensitivity of the second sensor is about , the sensitivity of the first sensor is about , thus the second sensor has a slew rate 10 times higher than the first sensor. Thus, the first sensor 20 is designed to measure with high precision the late stages of the time-domain electromagnetic decay shown in FIG. 1 , while the second sensor is designed to measure the early stages of this decay. This allows the system to accura...

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Abstract

A receiver system (18) for an electromagnetic prospecting system is disclosed. The electromagnetic prospecting system comprises a transmitter for transmitting a primary electromagnetic field so as to generate a secondary electromagnetic field from a terrain that is being prospected, the secondary electromagnetic field having a transient, decaying time domain profile. The receiver system (18) comprises first and second sensors (20, 22) for detecting the secondary electromagnetic field, wherein the second sensor (22) is less sensitive than the first sensor (20) so as to detect the secondary electromagnetic field over a first time period, with the first sensor (20) being used to detect the secondary electromagnetic field after the first time period. Typically, each sensor (20, 22) comprises three orthogonal SQUID magnetometers, with the second sensor (22) being approximately 10 times less sensitive than the first sensor (20).

Description

technical field [0001] The present invention relates to a transient electromagnetic receiver system and a method of collecting data in an electromagnetic surveying system. Background technique [0002] A typical survey system includes a transmitter for transmitting a primary electromagnetic field into the subsurface. The receiver is set to receive and record the secondary electromagnetic field generated by the eddy current emitted by the interaction between the underground ore body and the primary electromagnetic field. The receiver includes a single-component or three-component receiving coil and related electronic devices. The receiver is used. Generally, areas with conductivity equal to or lower than the average receive secondary electromagnetic fields induced by tiny eddy currents, while areas with higher conductivity tend to generate stronger eddy currents, resulting in measurable secondary electromagnetic fields. generation of electromagnetic fields. [0003] The sec...

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Application Information

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IPC IPC(8): G01R33/035G01V3/165G01V3/17G01V3/26G01V3/28G01V3/30
CPCG01R33/0354G01V3/12
Inventor 安德烈亚斯·奇沃洛詹姆斯·麦克纳伊龙尼·斯托尔兹
Owner 盎格鲁企业服务南非(控股)有限公司
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