Real-time anti-saturation device and real-time anti-saturation method for amplifier in magnetic resonance water detection system
An amplifier and magnetic resonance technology, which is applied in the field of real-time anti-saturation devices and anti-saturation methods, can solve the problems of difficult to achieve amplification in areas with small signals, large dynamic changes of signal amplitude, amplifier saturation, etc., to achieve reliable data and improve detection efficiency. Effect
Active Publication Date: 2018-07-03
JILIN UNIV
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Problems solved by technology
The amplification device of the traditional nuclear magnetic resonance water detection receiving system only sets the amplification factor once before the system works according to experience, and the sampling time under each pulse moment is 256ms, such as Figure 4 It is shown that the amplitude of the local signal changes greatly during this period of time. Using the same amplification factor will cause the amplifier in the area with a large signal to saturate, and it is difficult to achieve the amplification effect in an area with a small signal, especially due to strong interference such as spike noise. system not working
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[0038] In Changchun Beihu Wetland Park, a nuclear magnetic resonance underground water exploration system with a transmitting coil area of 100m*100m, a receiving coil area of 100m*100m, and an anti-saturation device is used as an example. The application of the saturation method is described. The sampling frequency of the magnetic resonance water exploration system is f=25kHz, the measurement time of each pulse moment is 256ms, and the number of sampling points is 6400.
[0039] The specific implementation steps are as follows:
[0040] a. System initialization: manually set the initialization magnification A = 32000, the preset upper limit V max =4V and preset lower limit V min =1V;
[0041] b. Signal acquisition: The signal acquisition mainly includes the FPGA module 7 controlling the ADC module 6 to pass the weak magnetic resonance signal through the preamplifier circuit 1, the broadband pass filter circuit 2, the narrowband filter circuit 3, the secondary amplifier ...
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The invention relates to a real-time anti-saturation device and a real-time anti-saturation method for an amplifier in a magnetic resonance water exploration system. According to the device, a preamplifier circuit is connected with an FPGA module through a broadband band-pass filter circuit, a narrowband filter circuit, a secondary amplifier circuit, a programmable amplifier circuit and an ADC module, the FPGA module is connected with an ROM module, an RAM module, the programmable amplifier circuit, an SCI interface and a network interface, and the FPGA module is connected with a computer through the SCI interface and the network interface. The idea of the invention is that the size of next sampling point is estimated based on the values of first few sampling points, and the best magnification is set for each sampling point, so the requirement of weak signal amplification is met on the premise that the amplifier is unsaturated. The whole magnification adjustment process is automatic and real-time, and the efficiency of groundwater exploration is improved. With the real-time anti-saturation device, groundwater exploration can be completed even in a complex environment with serious noise interference, and reliable data is provided for later signal processing and data inversion.
Description
technical field [0001] The invention relates to an anti-saturation device and an anti-saturation method of an amplifying circuit, in particular to a real-time anti-saturation device and an anti-saturation method applied to an amplifier in a magnetic resonance water exploration system. Background technique [0002] Nuclear magnetic resonance groundwater detection technology is a method that can directly and non-destructively detect groundwater in the field of geophysics today. After the groundwater is excited by the alternating magnetic field, a nuclear magnetic resonance signal is generated. The signal is generally nanovolt (nV) level and needs to be amplified by thousands or tens of thousands of times before it can be detected. At the same time, the signal is susceptible to electromagnetic noise from the external environment. interference. Due to the different interference noises in different areas to be measured, even the electromagnetic interference noises in different t...
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IPC IPC(8): H03G3/20H03M1/12G06F13/38
CPCG06F13/382H03G3/20H03M1/1245
Inventor 林婷婷张洋舒旭林君腾飞
Owner JILIN UNIV