CN213023608U - Low-noise magnetic resonance underground water detection data receiving device - Google Patents
Low-noise magnetic resonance underground water detection data receiving device Download PDFInfo
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- CN213023608U CN213023608U CN202021955042.8U CN202021955042U CN213023608U CN 213023608 U CN213023608 U CN 213023608U CN 202021955042 U CN202021955042 U CN 202021955042U CN 213023608 U CN213023608 U CN 213023608U
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Abstract
The utility model relates to the field of magnetic resonance detection, in particular to a low-noise magnetic resonance underground water detection data receiving device, which comprises a magnetic resonance sensor, a power supply circuit, a signal conditioning module, a collecting and storing module and a controller; the magnetic resonance sensor comprises a receiving coil, a resonance matching capacitor and a Q switch circuit, wherein the receiving coil is used for receiving a magnetic resonance signal, suppressing the ringing phenomenon of the signal through the Q switch circuit after suppressing the interference of the external noise of the pass band through a matching circuit, and transmitting the signal to a signal conditioning module; the signal conditioning module comprises an amplifier, a filter circuit and a collecting and storing module, wherein the amplifier amplifies a signal and then continues to filter and transmit the signal to the collecting and storing module; the controller is connected with the Q switch circuit to control the Q switch circuit, is connected with the amplifier and controls the amplification factor of the amplifier; and the power supply circuit is connected with the signal conditioning module, the acquisition and storage module and the controller for supplying power. This is novel has improved detectivity.
Description
Technical Field
The utility model relates to a magnetic resonance surveys the field, specifically magnetic resonance groundwater detection data receiving arrangement of low noise.
Background
The fresh water resources in China are deficient, and the magnetic resonance detection can qualitatively and quantitatively obtain the underground hydrological information. The magnetic resonance signal is very weak, can only reach nV level, is easily interfered by various noises, especially in the urban surrounding areas with strong noise interference, so that the signal-to-noise ratio of the data is seriously insufficient, and great difficulty is brought to correct data interpretation, therefore, the problem to be solved urgently in the field of ground magnetic resonance carbohydrate is to obtain a reliable magnetic resonance signal with a high signal-to-noise ratio. In order to solve the problem, the utility model discloses an artifical hyperpolarization field of applying has improved groundwater macroscopic view magnetization intensity, polarizes the magnetic resonance sensor in advance through the design low noise simultaneously, has effectively reduced the system noise.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a magnetic resonance groundwater detection data receiving arrangement of low noise has high SNR, high sensitivity's characteristics, can overcome traditional magnetic resonance groundwater detection data receiving arrangement signal weak, interference killing feature is poor, difficulty such as precision low.
The utility model is realized in such a way, a low-noise magnetic resonance underground water detection data receiving device is characterized in that a magnetic resonance sensor, a power supply circuit, a signal conditioning module, a collecting and storing module and a controller;
the magnetic resonance sensor comprises a receiving coil, a resonance matching capacitor and a Q switch circuit, wherein the receiving coil is used for receiving a magnetic resonance signal, suppressing the ringing phenomenon of the signal through the Q switch circuit after suppressing the interference of the external noise of the pass band through a matching circuit, and transmitting the signal to a signal conditioning module;
the signal conditioning module comprises an amplifier, a filter circuit and a collecting and storing module, wherein the amplifier amplifies a signal and then continues to filter and transmit the signal to the collecting and storing module;
the controller is connected with the Q switch circuit to control the Q switch circuit, is connected with the amplifier and controls the amplification factor of the amplifier;
and the power supply circuit is connected with the signal conditioning module, the acquisition and storage module and the controller for supplying power.
Further, the amplifier comprises a low noise preamplifier, a post-stage amplifier and a program control amplifier; the filter circuit comprises a band-pass filter, a power frequency wave trap and a low-pass filter, the low-noise preamplifier is sequentially connected with the band-pass filter and the power frequency wave trap, the power frequency wave trap is connected with the program control amplifier after being connected with the post-amplifier, and the program control amplifier is connected with the low-pass filter.
Furthermore, the acquisition and storage module adopts an integrated signal acquisition card NI-9239 produced by the national instruments of America to carry out acquisition and upload to an upper computer for real-time recording and storage.
Further, the tuning capacitor is connected in parallel with a high-voltage relay for preventing the high voltage coupled to the receiving coil from damaging the electronic components in the receiving system.
Further, the high-voltage relay is connected with a transient suppression diode in parallel and used for suppressing the overhigh transient voltage when the high-voltage relay is closed.
Further, the low noise preamplifier comprises four LT1028 non-inverting amplifiers.
Furthermore, the band-pass filter is constructed by cascading four second-order filters with the model number being LT1885, and each stage of the second-order filters has the amplification factor not more than 3.
Compared with the prior art, the utility model, beneficial effect lies in: the utility model discloses magnetic resonance groundwater detection data receiving arrangement sensor (MSBP) based on polarize in advance has improved detectivity, and the design is based on the Q switch circuit suppression ringing phenomenon of field effect transistor. Key hardware circuits of a signal conditioning module and a power supply module in the receiving device are designed, and the requirements of low background noise, wide gain dynamic range, strong filtering capability and the like are met. The problems that the existing magnetic resonance data receiving device is insufficient in signal-to-noise ratio, low in sensitivity, poor in anti-interference capability and the like are solved.
Drawings
Fig. 1 is a general block diagram of a magnetic resonance underground water detection data receiving apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a magnetic resonance sensor circuit based on pre-polarization according to an embodiment of the present invention;
fig. 3 is a structural diagram of a signal conditioning module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a low noise preamplifier circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a Fliege power frequency wave trap provided by the embodiment of the present invention;
fig. 6 is a schematic diagram of a program-controlled operational amplifier circuit provided in an embodiment of the present invention;
fig. 7 is a schematic diagram of a zero drift operational amplifier circuit provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of a low-pass filter circuit provided in an embodiment of the present invention;
fig. 9 is a block diagram of a power supply module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, a low-noise magnetic resonance underground water detection data receiving device includes a magnetic resonance sensor, a power supply circuit, a signal conditioning module, an acquisition and storage module, and a controller;
the magnetic resonance sensor comprises a receiving coil, a resonance matching capacitor and a Q switch circuit, wherein the receiving coil is used for receiving a magnetic resonance signal, suppressing the ringing phenomenon of the signal through the Q switch circuit after suppressing the interference of the external noise of the pass band through a matching circuit, and transmitting the signal to a signal conditioning module;
the signal conditioning module comprises an amplifier for amplifying signals, and then filtering and transmitting the amplified signals to an acquisition and storage module through a filter circuit, wherein the acquisition and storage module adopts an integrated signal acquisition card NI-9239 produced by American national instruments and companies for acquisition and uploading the acquired signals to an upper computer for real-time recording and storage;
the controller is connected with the Q switch circuit to control the Q switch circuit, is connected with the amplifier and controls the amplification factor of the amplifier;
the power supply circuit is connected with the signal conditioning module, the acquisition and storage module and the controller for supplying power, and has the main function of providing stable power supply voltage with small ripple waves for each module of the receiving system. When the system works, the power supply module needs to output a digital power supply, a power supply and an analog power supply. The digital power supply supplies power to the controller, the power supply supplies power to the high-voltage relay, and the analog power supply supplies power to the acquisition and storage module and the signal conditioning module. The power module is powered by a 12V lithium battery, the lithium battery has the advantages of long service life, high energy, low self-discharge rate and the like, and the power module is built by taking an integrated power chip produced by MORNUN as a core.
The controller controls the high-voltage relay, the Q switch circuit, the program control amplifier and the like through photoelectric isolation devices such as a photoelectric coupling digital circuit and the like, and communicates with a computer. When the receiving system starts to collect, firstly, the high-voltage relay is controlled to be conducted to start to acquire the magnetic resonance signals, and meanwhile, the Q switch circuit is controlled to enable the MSBP to be in a high Q value state, so that the collection of the magnetic resonance signals is not influenced. Secondly, the amplifier combination of the control signal conditioning module sets a proper amplification factor to amplify the magnetic resonance signal. And finally, collecting the magnetic resonance signals after signal conditioning by the integrated NI collecting card, and uploading the magnetic resonance signals to a computer for storage and display.
The amplifier comprises a low-noise preamplifier, a post-stage amplifier and a program-controlled amplifier; the filter circuit comprises a band-pass filter, a power frequency wave trap and a low-pass filter, the low-noise preamplifier is sequentially connected with the band-pass filter and the power frequency wave trap, the power frequency wave trap is connected with the program control amplifier after being connected with the post-amplifier, and the program control amplifier is connected with the low-pass filter.
Referring to fig. 2, a schematic diagram of a pre-polarized mr sensor circuit is shown, in which a tuning capacitor is connected in parallel with a high-voltage relay for preventing the high voltage coupled to the receiving coil from damaging the electronic components in the receiving system. The high-voltage relay is connected in parallel with a transient suppression diode for suppressing an excessively high transient voltage when the high-voltage relay is closed. The RMC formed by the resonance matching capacitor and the receiving coil can increase magnetic resonance signals and inhibit noise interference outside a pass band; the high-voltage relay prevents the high voltage coupled to the receiving coil from damaging electronic components in the receiving system when emitting large current to excite the underground water; the low-noise operational amplifier amplifies the magnetic resonance signal for subsequent signal conditioning and sampling; the Q-switch circuit (Q-switch) suppresses ringing induced by MSBP.
A resonance type receiving coil matching circuit (RMC) exhibits a pure resistance characteristic only at a Larmor frequency, and therefore, while amplifying a magnetic resonance signal at the Larmor frequency, can effectively suppress noise outside the Larmor frequency and optimize the sensitivity of a receiving coil.
In this embodiment, the low noise preamplifier includes four LT1028 non-inverting amplifiers.
The field effect transistor is connected in parallel with a Q switch circuit, and the circuit keeps low resistance during transmitting so as to reduce the Q value of the receiving coil matching circuit and inhibit ringing effect. When the transmitting power supply is turned off, the resistance value of the circuit is increased to be large in a short time, so that the Q value of the RMC is increased to be the maximum value, the signal-to-noise ratio of the acquired signal is ensured, and the normal measurement is not influenced.
Referring to fig. 3, a structural diagram of a signal conditioning module is shown, where the magnetic resonance signal has a weak amplitude, and is susceptible to noise in a field working environment and interference from noise of a conditioning circuit in a signal receiving apparatus. Therefore, a signal conditioning module with strong filtering capability, low background noise and wide gain dynamic range needs to be designed. The signal processing module comprises a low-noise preamplifier, a broadband filter, a Fliege wave trap, a post-stage amplifier, a program-controlled amplifier and a low-pass filter.
Referring to fig. 4, the low noise preamplifier is composed of four non-inverting amplifiers of type LT1028, has the characteristics of low voltage noise and low current noise, and can effectively reduce the overall noise of MSBP.
The band-pass filter, the low-pass and high-pass filters that constitute the band-pass filter are all constructed by the way that four second order filters (model LT1885) cascade, and the magnification of each level of filter can not exceed 3, just can the stable work, and this is mainly decided by the figure of merit of filter.
The figure 5 shows a Fliege power frequency trap which is formed by constructing two operational amplifiers with the models of OP37 through an external circuit, so that power frequency harmonic interference can be effectively eliminated, the frequency spectrum of a magnetic resonance signal cannot be influenced, and the detection signal-to-noise ratio can be effectively improved. When the detection area is changed to cause the change of the Larmor frequency, the local detection environment is adapted by adjusting the trap frequency f of the Fliege trap to be two power frequency harmonic components on the frequency spectrum, which are closest to the Larmor frequency.
The post-stage amplifier consists of a program-controlled operational amplifier, a zero-drift operational amplifier and a low-pass filter. The zero drift operational amplifier and the program control amplifier in the post-stage amplifier can set proper amplification times aiming at complex environments, and the low-pass filter can not only avoid the interference of high-frequency noise caused by a switching power supply to the NI acquisition card, but also avoid aliasing interference in the acquisition process.
Referring to fig. 6, the program-controlled operational amplifier is formed by building a non-inverting amplifier with an integrated operational amplifier of the type LTC1564 as a core, and has not only an anti-aliasing filtering function but also an amplification gain adjusting function.
Referring to fig. 7, the zero-drift operational amplifier is constructed by an integrated operational amplifier of LTC2057, and its principle is the same as that of the low noise preamplifier, so as to reduce the noise level of the zero-drift operational amplifier.
Referring to fig. 8, the low pass filter is constructed by using an integrated operational amplifier LTC1563 as a core, and the LTC1563 is an integrated fourth-order low pass filter, and the cut-off frequency of the integrated fourth-order low pass filter is adjustable between 256Hz and 256 kHz.
Referring to fig. 9, a power supply module is shown, and its main function is to provide a stable power supply voltage with small ripple to each module of the receiving system. When the system works, the power supply module needs to output a digital power supply, a power supply and an analog power supply. The digital power supply supplies power to the controller, the power supply supplies power to the high-voltage relay, and the analog power supply supplies power to the acquisition and storage module and the signal conditioning module. The power module is powered by the 12V lithium battery, and the lithium battery has the advantages of long service life, high energy, low self-discharge rate and the like.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A low-noise magnetic resonance underground water detection data receiving device is characterized by comprising a magnetic resonance sensor, a power supply circuit, a signal conditioning module, an acquisition and storage module and a controller;
the magnetic resonance sensor comprises a receiving coil, a resonance matching capacitor and a Q switch circuit, wherein the receiving coil is used for receiving a magnetic resonance signal, suppressing the ringing phenomenon of the signal through the Q switch circuit after suppressing the interference of the external noise of the pass band through a matching circuit, and transmitting the signal to a signal conditioning module;
the signal conditioning module comprises an amplifier, amplifies the signal, continuously filters the signal through a filter circuit and transmits the signal to the acquisition and storage module;
the controller is connected with the Q switch circuit to control the Q switch circuit, is connected with the amplifier and controls the amplification factor of the amplifier;
and the power supply circuit is connected with the signal conditioning module, the acquisition and storage module and the controller for supplying power.
2. A low noise magnetic resonance groundwater detection data receiving apparatus as claimed in claim 1, wherein the amplifier comprises a low noise preamplifier, a post-amplifier and a programmable amplifier; the filter circuit comprises a band-pass filter, a power frequency wave trap and a low-pass filter, the low-noise preamplifier is sequentially connected with the band-pass filter and the power frequency wave trap, the power frequency wave trap is connected with the program control amplifier after being connected with the post-amplifier, and the program control amplifier is connected with the low-pass filter.
3. The low-noise magnetic resonance underground water detection data receiving device as claimed in claim 1, wherein the collecting and storing module adopts an integrated signal collecting card NI-9239 to collect and upload to an upper computer for real-time recording and storing.
4. A low noise magnetic resonance ground water detection data receiving apparatus as claimed in claim 1, wherein said tuning capacitor is connected in parallel with a high voltage relay for preventing the high voltage to which the receiving coil is coupled from damaging the electronic components in the receiving system.
5. A low noise magnetic resonance groundwater detection data receiving apparatus as claimed in claim 4, wherein the high voltage relay is connected in parallel with a transient suppression diode for suppressing an excessive transient voltage when the high voltage relay is closed.
6. A low noise magnetic resonance groundwater detection data receiving apparatus as claimed in claim 2, wherein the low noise preamplifier comprises four LT1028 non-inverting amplifiers.
7. A low noise magnetic resonance ground water detection data receiving apparatus as claimed in claim 2, wherein said band pass filter is constructed by cascading four second order filters of type LT1885, each stage of the second order filters having an amplification factor of not more than 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021955042.8U CN213023608U (en) | 2020-09-09 | 2020-09-09 | Low-noise magnetic resonance underground water detection data receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021955042.8U CN213023608U (en) | 2020-09-09 | 2020-09-09 | Low-noise magnetic resonance underground water detection data receiving device |
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| Publication Number | Publication Date |
|---|---|
| CN213023608U true CN213023608U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021955042.8U Expired - Fee Related CN213023608U (en) | 2020-09-09 | 2020-09-09 | Low-noise magnetic resonance underground water detection data receiving device |
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2020
- 2020-09-09 CN CN202021955042.8U patent/CN213023608U/en not_active Expired - Fee Related
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Granted publication date: 20210420 Termination date: 20210909 |