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Anti-saturation high-gain self-adaptive cancellation type terrestrial NMR signal amplification device

A technology of ground nuclear magnetic resonance and signal amplification, which is applied in the direction of electron magnetic resonance/nuclear magnetic resonance detection, etc., can solve the problem of interference with the effective extraction of ground nuclear magnetic resonance signals, and achieve the effect of meeting resolution requirements and preventing saturation

Active Publication Date: 2018-02-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an anti-saturation high-gain self-adaptive cancellation ground nuclear magnetic resonance signal amplification device to solve the problem of effective extraction of ground nuclear magnetic resonance signals under the interference of various noise sources near the detection point

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  • Anti-saturation high-gain self-adaptive cancellation type terrestrial NMR signal amplification device
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  • Anti-saturation high-gain self-adaptive cancellation type terrestrial NMR signal amplification device

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Embodiment 1

[0032] The block diagram of Embodiment 1 of the anti-saturation high-gain self-adaptive cancellation type terrestrial nuclear magnetic resonance signal amplifying device of the present invention is as follows Figure 4 and Figure 5 shown. When there are multiple environmental noise sources near the detection point, it is necessary to lay multiple reference coils to collect the environmental noise, offset the relevant environmental noise in the main signal coil, and realize the effective extraction of ground NMR signals under strong noise interference. This embodiment includes a main signal receiving coil 10 and three reference coils (20, 30, 40) ( Figure 4 ). The signal received by the main coil is the superposition S(t)+N(t) of the ground NMR signal S(t) generated by the signal source and the white noise and power frequency noise signal N(t) generated by the noise source, and the signal received by the reference coil The signal is the ambient noise generated by the noise...

Embodiment 2

[0063] The block diagram of Embodiment 2 of the anti-saturation high-gain adaptive cancellation type terrestrial nuclear magnetic resonance signal amplification device of the present invention is as follows Figure 6 , Figure 7 and Figure 8 shown. This embodiment is mainly suitable for the case where there is only one environmental noise source near the detection point, and only one reference coil is needed. This embodiment includes three main signal receiving coils (10, 50, 60) and a reference coil 20 ( Figure 7 ). The main channel receives the ground NMR signal S from the signal source m (t)(m=1,2,3), interfered by the noise source, the main channel also receives the environmental noise N m (t)(m=1,2,3), therefore, the signal of the main receiving coil can be expressed as the superposition S of the ground NMR signal and the environmental noise m (t)+N m (t) (m=1, 2, 3), the signal received by the reference coil is expressed as ambient noise N(t). The signal receiv...

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Abstract

The invention relates to an anti-saturation high-gain adaptive cancellation type ground nuclear magnetic resonance signal amplifying device. In a strong noise environment, the output of the amplifier is saturated if the gain is too high, and the NMR signal cannot be effectively amplified if the gain is too low. The invention adopts one or more main channels to receive ground nuclear magnetic resonance signals, and one or more reference channels to receive environmental noise. After passing through the preamplifier and band-pass filter, the received data enters the adaptive noise canceller after passing through the analog-to-digital converter. Using the variable step size adaptive algorithm, adaptively track and learn the environmental noise in the main channel, and subtract the analog quantity in the main channel after the digital-to-analog converter, which can effectively filter out the relevant environmental noise, and then perform high gain Amplification can prevent the final amplifier from being saturated while meeting the resolution requirements of the data acquisition system.

Description

technical field [0001] The invention relates to a ground nuclear magnetic resonance signal conditioning and data acquisition device, in particular to a signal amplification device with a high gain that can effectively prevent amplifier saturation and a real-time self-adaptive noise cancellation function of a reference coil. Background technique [0002] There are many methods to detect underground freshwater resources. Surface nuclear magnetic resonance technology (MRS) is a new method of geophysical direct detection of groundwater developed internationally in recent years. Compared with the traditional geophysical method of indirect detection of groundwater, surface nuclear magnetic resonance technology has the advantages of direct non-invasiveness, high resolution, high efficiency, rich information and unique solution, and can determine the depth of the aquifer without drilling. Thickness, water content, average porosity of the aquifer, and the cost of completing a nuclear...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/14
Inventor 蒋川东刘骏妍林君孙淑琴于雷
Owner JILIN UNIV