Anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus

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

Active Publication Date: 2016-01-06
JILIN UNIV
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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 offset type ground nuclear magnetic resonance signal amplification apparatus
  • Anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus
  • Anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus

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Embodiment 1

[0032] The block diagram of Embodiment 1 of the anti-saturation high-gain adaptive cancellation type terrestrial nuclear magnetic resonance signal amplifying device of the present invention is as follows Figure 4 with 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 sou...

Embodiment 2

[0065] 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 Image 6 , Figure 7 with 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 required. 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 rece...

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Abstract

The invention relates to an anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus. In a high-noise environment, in case of too high gains, output of an amplifier is satirized, and in case of too low gains, nuclear magnetic resonance signals cannot be effectively amplified. According to the invention, the ground nuclear magnetic resonance signals are received by use of one or more main channels, and ambient noise is received through one or more reference channels. After passing through a front amplifier and a band pass filter, receiving data passes through an analog-to-digital converter and then enters a self-adaptive noise canceller. By use of a variable step self-adaptive algorithm, the ambient noise in a learning main channel is adaptively tracked, the noise is subjected to analog quantity subtraction in the main channel after passing through a digital-to-analog converter, and high-gain amplification is then carried out after the correlation ambient noise can be effectively filtered, such that saturation of a final amplifier can be prevented, and at the same time, the requirement for resolution of a data acquisition system is met.

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...

Claims

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Application Information

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