Ground magnetic resonance signal detecting device with automatic gain adjusting function, and ground magnetic resonance signal detecting method
A magnetic resonance signal and automatic adjustment technology, which is applied in magnetic resonance measurement, detection by electronic magnetic resonance/nuclear magnetic resonance, measurement of magnetic variables, etc. , to achieve good matching of magnification, suppress amplifier saturation, and achieve the effect of precise synchronization
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Embodiment 1
[0030] In the electromagnetic shielding laboratory, taking a DC voltage of 0.23mV as the input and a sampling time of 256ms as an example, the application of the ground magnetic resonance signal detection device and detection method with automatic gain adjustment function is described.
[0031] The specific implementation steps are as follows:
[0032] a. Initial parameter setting: the sampling frequency of the pre-sampling ADC module 5 is set to 25kHz by the computer, the main sampling ADC module 6 is set as an external interrupt triggering sampling mode, and the initial magnification factor A=32000 is set;
[0033] b. Pre-sampling ADC acquisition signal: FPGA module 7 controls the pre-sampling ADC module 5 to convert the weak magnetic resonance signal into a digital signal after being amplified by the preamplifier circuit 1, which is the value V of the first sampling point p1 =0.46V, the amplification factor of the preamplifier is A p =2000;
[0034] c. Signal judgment: th...
Embodiment 2
[0041] In Shaoguo Town, Changchun, a magnetic resonance water detector integrating transceiver and signal detection device designed by the present invention is used to illustrate the application of the ground magnetic resonance signal detection device and detection method with automatic gain adjustment function.
[0042] The specific implementation steps are as follows:
[0043] a. Initial parameter setting: set the sampling frequency of the pre-sampling ADC module 5 through the computer, set the main sampling ADC module 6 as an external interrupt trigger sampling mode, and set the initialization magnification factor A;
[0044] b. Pre-sampling ADC acquisition signal: FPGA module 7 controls the pre-sampling ADC module 5 to convert the weak magnetic resonance signal into a digital signal V after being amplified by the pre-amplification circuit 1 pi , V pi is the value of the i-th sampling point, and the amplification factor of the preamplifier is A p ;
[0045] c. Signal jud...
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