CN206710579U - The high-precision detection device of Larmor's magnetic resonance signal - Google Patents
The high-precision detection device of Larmor's magnetic resonance signal Download PDFInfo
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- CN206710579U CN206710579U CN201720408228.3U CN201720408228U CN206710579U CN 206710579 U CN206710579 U CN 206710579U CN 201720408228 U CN201720408228 U CN 201720408228U CN 206710579 U CN206710579 U CN 206710579U
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- frequency
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- magnetic resonance
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- resonance signal
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Abstract
The high-precision detection device of Larmor's magnetic resonance signal disclosed in the utility model, it is a kind of device for the measurement of Larmor's magnetic resonance signal, the device is mainly converted and filter amplification circuit, frequency mixer by modulate circuit, FPGA, D/A for being connected with electric signal, the ARM embedded type control modules and display module to be communicated with FPGA, and formed as the high-precision radio frequency source of FPGA timing reference inputs.The utility model has the influence that can prevent its internal phase locking frequency multiplying additional phase noise, improves frequency stability；The advantages that can ensure that the accuracy of detection to Weak magentic-field.
Description
Technical field
It the utility model is related to the frequency measurement field of magnetic resonance signal, and in particular to a kind of Larmor's magnetic resonance signal
High-precision detection device, the accurate measurement to Larmor's magnetic resonance signal frequency can be realized, be established for the measurement of Weak magentic-field
Technical foundation.
Background technology
High-precision weak magnetic fields measurement technology is widely used in cosmic magnetic field measurement, geophysical exploration, aeromagnetic detection
Paint, seismic monitoring and prediction, geological prospecting, geomagnetic matching navigation, archaeology, maritime affairs are salvaged etc., be also widely used in numerous
Military use, and Larmor frequency measuring system is wherein important part.
Larmor's magnetic resonance signal is a kind of signal exported by self-excitation optical pumping magnetometer physical system, and optical magnetic resonance is frequently
Rate and the external magnetic field of its present position have strict Larmor's proportionate relationship, therefore the measurement of magnetic field intensity can be converted into frequency
Measurement, its magnetic-field measurement precision depend on frequency detecting accuracy.It can be realized by measuring Larmor's magnetic resonance signal
Accurate measurement to earth's magnetic field, and the precision of magnetic field detection depends on resolution ratio and the sensitivity of frequency measurement.
Therefore, it is necessary to develop it is a kind of have very fast response speed and can be used for Larmor's magnetic resonance compared with high measurement accuracy
The high-precision detection device of signal.
The content of the invention
Technical problem to be solved in the utility model is：A kind of high precision test dress of Larmor's magnetic resonance signal is provided
Put, to meet requirement of the optical pumping magnetic force detection to the comprehensive technical indexes of Larmor's magnetic resonance signal measuring system proposition.
The utility model solves its technical problem and uses following technical scheme：
The high-precision detection device of Larmor's magnetic resonance signal provided by the utility model, it is that one kind is total to for Larmor's magnetic
Shake the device of signal measurement, main modulate circuit, FPGA, D/A conversion and the filter and amplification electricity by being connected with electric signal of the device
Road, frequency mixer, the ARM embedded type control modules and display module to be communicated with FPGA, and the height as FPGA timing reference inputs
Precision radio frequency source forms.
Described modulate circuit, it is made up of bigness scale modulate circuit and accurate measurement modulate circuit；The bigness scale modulate circuit by with
The connected high-precision noise reduction filtering circuit of electric signal, Hyblid Buffer Amplifier and filtering shaping circuit composition, the accurate measurement modulate circuit by
Formed with high-performance low pass filter, Hyblid Buffer Amplifier and the filtering shaping circuit that electric signal is connected.
Described bigness scale modulate circuit, its high-precision noise reduction filtering circuit use 7 rank Low-pass Elliptic Filters, the wave filter
Larmor's magnetic resonance signal is surveyed in input reception；Its filtering shaping circuit output termination FPGA frequency measurement module.
Described accurate measurement modulate circuit, its high-performance low pass filter are mainly made up of operational amplifier UA741, the filtering
The input termination frequency mixer of device；Its filtering shaping circuit output termination FPGA frequency measurement module.
Described FPGA uses EP3SL70F780C2 chips.
Described high-precision radio frequency source, it is that one kind is tamed using the small-sized rubidium atomic clocks of 10MHz and GPS/ Big Dipper dual mode signals
Thermostatic control voltage controlled oscillator OC-VCXO, it is as high-precision radio frequency source obtained by multiple duplication timing reference input frequency multiplication.
Described frequency mixer uses AD835 analog multipliers.
The utility model has the advantage that compared with prior art and effect：
1. improve frequency stability：
After high-precision radio frequency source is using the high steady frequencys multiplication of frequency source 50 of 10MHz, after 500MHz frequency-selectings amplification and shaping circuit
Obtain.Inputted using the taming thermostatic control voltage controlled oscillator OC-VCXO of small-sized rubidium atomic clock and GPS/ Big Dippeves dual mode signal
Reference frequency standard, meet the requirement of the superregulated property of reference clock source and degree of accuracy index, meet to measuring system high accuracy
Requirement.× 50 frequency multiplier circuits using low noise FET composition × 2, × 5, × 5 three-level frequency multiplier circuit, frequency multiplier circuit is same
When there is double tunning function, the input clock of the signal of frequency multiplication to 500MHz as DDS, replace the lock phase that former special DDS is carried
Frequency multiplier circuit, prevent the influence of its internal phase locking frequency multiplying additional phase noise, improve frequency stability.
2. it can ensure that the accuracy of detection to Weak magentic-field：
After Larmor's magnetic resonance signal is filtered, by having good put down just in 53kHz~350kHz frequency ranges
The broadband buffer amplifier amplification of smooth degree, reaches the influence for reducing interference and noise, it is ensured that to the accuracy of detection of Weak magentic-field.And
Again high-precision noise reduction filtering is carried out in measuring circuit is nursed one's health in bigness scale by 7 rank Low-pass Elliptic Filters.7 rank elliptic filters lead to
Band and stopband, which have, waits moire behavior and approximation properties are good, has 3 trap wave points, by rationally designing the trap of each trap wave point frequently
Rate, the cut-off characteristics that can have reached wave filter, filter out the spurious components in 53kHz~350kHz frequency ranges.
3. the present apparatus considers the factors such as device layout, mechanical structure and Electro Magnetic Compatibility, practical furtheing investigate
Model machine is designed on the basis of high-precision Larmor's magnetic resonance signal measuring system, the key technical indexes reaches domestically leading level,
Index is as follows：
Operating frequency range：53kHz~350kHz (corresponding frequency measurement scopes：15000~100000nT)；
Frequency resolution：0.001Hz (magnetic survey resolution ratio is better than 0.0003nT)；
Sensitivity：Better than 0.001nT/ (rms)；
Internal clocking：Resolution ratio is better than 0.0005Hz, drift≤0.001Hz/ days.
Experimental test is carried out to Larmor's magnetic resonance signal using model machine and obtains following table data：
Brief description of the drawings
Fig. 1 is the general structure block diagram of the utility model device.
Fig. 2 is 50 frequency multiplier circuit theory diagrams.
Fig. 3 is each module frame chart realized by FPGA.
Fig. 4 is that DDS module realizes block diagram.
Fig. 5 is that block diagram is realized in equally accurate frequency measurement.
Embodiment
The utility model is not limited to following described or diagram structure and implementation detail, can also have other specific
Embodiment, the utility model is further described with reference to embodiment and accompanying drawing.
The high-precision detection device of Larmor's magnetic resonance signal provided by the utility model, it is that one kind is total to for Larmor's magnetic
Shake the system of signal measurement.The structure of the device is as shown in figure 1, main modulate circuit, FPGA, D/A by being connected with electric signal
Conversion and filter amplification circuit, frequency mixer, the ARM embedded type control modules and display module to be communicated with FPGA, and conduct
The high-precision radio frequency source composition of FPGA timing reference inputs.
Detection means is to Larmor's magnetic resonance signal elder generation bigness scale to be measured accurate measurement again in the utility model.Direct frequency measurement method obtains
To the bigness scale frequency of measured signal, fast response time；The bigness scale frequency signal that equal precision measuring frequency way exports to DDS and former letter to be measured
Number mixed frequency signal measure accurate measurement frequency, measurement accuracy is high.Signal is carried out by modulate circuit before bigness scale and accurate measurement simultaneously noise reduction,
Filtering, frequency-selecting, amplification and Shape correction, it ensure that the measurement accuracy of system.Described modulate circuit, by bigness scale modulate circuit and
Accurate measurement modulate circuit forms.Described bigness scale modulate circuit, for being processed for surveying to Larmor's magnetic resonance signal to be measured
Frequency module carries out direct frequency measurement to it, and it is whole by the high-precision noise reduction filtering circuit, Hyblid Buffer Amplifier and filtering being connected with electric signal
Shape circuit forms；High-precision noise reduction filtering circuit uses 7 rank Low-pass Elliptic Filters, and Larmor's magnetic resonance is surveyed in the reception of its input
Signal, filtering shaping circuit output termination FPGA frequency measurement module.Described accurate measurement modulate circuit is used for frequency mixer output
Difference frequency signal is processed for frequency measurement module and carries out equally accurate frequency measurement to it, and the accurate measurement modulate circuit with electric signal by being connected
High-performance low pass filter, Hyblid Buffer Amplifier and filtering shaping circuit composition, wherein high-performance low pass filter uses operation amplifier
Device UA741 and peripheral resistance, capacity cell composition, it inputs termination frequency mixer, filtering shaping circuit output termination FPGA survey
Frequency module.
The FPGA (field programmable gate array) uses the EP3SL70F780C2 chips of ALTERA companies, realizes this reality
With the ultrahigh resolution DDS module and high accuracy frequency measurement module needed for new middle detection means.It is used as by high-precision radio frequency source
Reference clock source, based on programmable phase accumulator, using needed for DDS Direct Digital Frequency Synthesizer Technologies generation bigness scale, accurate measurement
Frequency signal, meet its output frequency be better than 10 μ Hz requirement.And high accuracy frequency measurement module then based on direct frequency measurement method and waits
Precision Measuring Frequency Method carries out frequency measurement processing to signal.Direct frequency measurement module, equally accurate frequency measurement module, super-resolution are provided with inside FPGA
Rate DDS module, bigness scale and accurate measurement clock processing module, signal processing module and communication module, as shown in figure 3, utilizing its hardware
Parallel advantage, make circuit realiration more flexible, decrease noise jamming and precision deficiency that excessive peripheral hardware circuit is brought
Puzzlement.Wherein：The bigness scale and accurate measurement clock processing module, it is connected with high-precision radio frequency source；Direct frequency measurement module and bigness scale
Modulate circuit is connected；Equally accurate frequency measurement module is connected with accurate measurement modulate circuit；Ultrahigh resolution DDS module is converted and filtered through D/A
Ripple amplifying circuit is followed by frequency mixer；Communication module is communicated with ARM embedded type control modules by SPI modes；Signal processing module exists
Inside FPGA respectively with direct frequency measurement module, equally accurate frequency measurement module, ultrahigh resolution DDS module, bigness scale and accurate measurement clock
Reason module and communication module are connected, and it is handled the frequency information that frequency measurement module obtains, and result is transmitted into communication module, then
DDS module output is controlled after the control information processing that communication module is fed back to.
The high-precision radio frequency source, it is a kind of taming using the small-sized rubidium atomic clocks of 10MHz and GPS/ Big Dippeves dual mode signal
Thermostatic control voltage controlled oscillator OC-VCXO is as high-precision radio frequency source obtained by multiple duplication timing reference input frequency multiplication.Frequency is surveyed
The standard clock signal frequency of amount is higher, and measurement accuracy is better, can meet weak magnetic detection resolution, precision and the high standard of sensitivity
Alignment request.Two kinds of frequency standards can be compared mutually, effectively improve the measurement accuracy to Larmor's magnetic resonance signal, while wherein
It is another when one kind is devoted oneself to work to be used as reserved resources, to ensure the reliability of system work.Its operation principle is：It is high-precision
Degree radio-frequency source signal send the frequency measurement clock processing module of FPGA design, production after 50 frequencys multiplication shown in Fig. 2 and frequency-selecting amplification shaping
Split-second precision standard needed for raw frequency measurement.
The D/A conversion is prior art with filter amplification circuit, and its D/A conversion uses 2X8 film patch electric resistance arrays,
Due to using passive device, there is good stability and conversion speed.
The frequency mixer uses the AD835 analog multipliers of ADI companies, and the multiplier has input impedance height, output electricity
The advantages of small, noise is low is flowed, it is thick for Larmor's magnetic resonance signal to be exported with the ultrahigh resolution DDS module realized by FPGA
The mixing of measured frequency signal produces difference frequency signal.
Larmor's magnetic resonance signal to be measured is former using optical action according to the intensity in earth's magnetic field by optical pumped magnetometer
Reason produces.
The high-precision detection device of Larmor's magnetic resonance signal provided by the utility model, its course of work are as follows：
The height that the taming thermostatic control voltage controlled oscillator OC-VCXO of small-sized rubidium atomic clock and GPS/ Big Dippeves dual mode signal is made
The 10MHz signal frequency multiplications that steady frequency source provides are to 500MHz, through high-speed comparator and Schmidt trigger shaping after frequency-selecting amplification
FPGA is sent to make reference clock for standard block.Signal frequency multiplication need to be produced by High Degree Frequency Multiplier, and phaselocking frequency multiplier meeting inside FPGA
Produce serious additional phase to make an uproar, greatly influence the stability of radio frequency clock, therefore abandon using and use well-designed Fig. 2
Shown high accuracy × 2, × 5, × 5 frequency multiplier and corresponding selective frequency amplifier circuit, make it have extremely low shake and it is additional mutually make an uproar,
Meet the requirement of the superregulated property of radio frequency reference clock source and degree of accuracy index.
Larmor's magnetic resonance signal to be measured is sent into bigness scale modulate circuit, first through highly-precise filtering noise reduction and slow puts and shaping electricity
Road handle, filter out the clutter in Larmor's magnetic resonance signal, then amplified by broadband buffer amplifier, then through high-speed comparator with
The bigness scale that standard block send the direct frequency measurement module in Fig. 3 to complete Larmor's magnetic resonance signal is shaped as after Schmidt trigger.
Then bigness scale value is sent to ARM embedded type control modules by SPI serial communications, ARM embedded type control modules are to the frequency values
Less than hundred progress censored treatments, obtain the frequency values of more than hundred.The high-end frequency as corresponding to said frequencies value calculates DDS
Control data word, plus the low level frequency control data for determining DDS resolution ratio, the frequency control word of phase accumulator is sent to meet
DDS resolution ratio is better than 10 μ Hz, and phase accumulator control wave memorizer is output to the buffering that structure is taken using independent analog device
The high-speed d/a translation circuit being combined with resistor network is deposited, obtains the letter of the high-resolution sinusoidal frequency after bigness scale censored treatment
Number, as shown in Figure 4.The signal is mixed with the tested Larmor's magnetic resonance signal of original again, and low-pass filtered and amplification Shape correction obtains
To difference frequency signal.The difference frequency signal frequency is relatively low, in the range of 100Hz, by accurate measurement modulate circuit handle after by Fig. 3 etc.
Precision Measuring Frequency module accurately measures, and equal precision measuring frequency way is as shown in figure 5, frequency resolution is better than 0.001Hz.Accurate measurement result is led to again
Crossing after the frequency measurement data process＆analysis that SPI communication send FPGA signal processing module to carry out high-speed high capacity calculates send ARM embedding
Enter formula control module, the frequency values for just obtaining high-precision Larmor's magnetic resonance signal are added with bigness scale frequency, resolution ratio is better than
0.0003nT。
When ARM embedded type control modules mainly complete the correlation computations and control, high accuracy of bigness scale frequency and accurate measurement frequency
Frequency source switching, the communication of the GPS/ Big Dippeves and positioning, the control to each modules of FPGA, data exchange and man-machine interaction etc..ARM processing
Device little power consumption function is strong, at the data that can carry out high-speed high capacity in the utility model needed for detection means fast and flexible
Reason, multitask is dispatched in time and optimization frequency Measurement Algorithm, its optimized algorithm and data processing method, meet sample rate it is high,
Response time fast requirement, to adapt to have quick response and the difference change of big magnetic field gradient.
There is following relation between Larmor's magnetic resonance signal frequency and earth's magnetic field：
FLight=HGround×3.498577Hz (1)
Communicated by the GPS/ Big Dippeves and obtain the information such as time, position, the processing of ARM embedded type control modules obtains the ground of measurement point
Information, then transition Larmor magnetic resonance signal and the relational expression (1) of tested external magnetic field by the above-mentioned adjacent sub- energy level of Zeeman are managed, i.e.,
The magnetic field intensity in residing geographical position can be obtained.Arm processor can judge whether GPS works just according to the geographical position of acquisition
Often, if normally, frequency source uses the GPS/ Big Dipper precision time service frequency source modules when high-precision；If abnormal, switched by arm processor
Rubidium clock is enabled, ensures frequency source high-precision requirement during system pair.Then arm processor completes bigness scale frequency with FPGA, DDS is controlled
The two-way communication of word, accurate measurement frequency, then calculates correlated frequency, finally complete correlated frequency, geographical coordinate, the time it is aobvious
Show and man-machine interaction etc..
The utility model completes the conditioning, filtering and measurement of Larmor's magnetic resonance signal, realizes to its accurate measurement
And detection in real time and processing.
Claims (7)
- A kind of a kind of 1. high-precision detection device of Larmor's magnetic resonance signal, it is characterized in that Larmor's magnetic resonance signal that is used for is surveyed The device of amount, the device mainly modulate circuit, FPGA, D/A conversion and filter amplification circuit, the mixing by being connected with electric signal Device, the ARM embedded type control modules and display module to be communicated with FPGA, and the high-precision radio frequency as FPGA timing reference inputs Source forms.
- 2. the high-precision detection device of Larmor's magnetic resonance signal according to claim 1, it is characterised in that described tune Circuit is managed, is made up of bigness scale modulate circuit and accurate measurement modulate circuit；The bigness scale modulate circuit is high-precision by being connected with electric signal Spend noise reduction filtering circuit, Hyblid Buffer Amplifier and filtering shaping circuit composition, the accurate measurement modulate circuit is by the height that is connected with electric signal Performance low pass filter, Hyblid Buffer Amplifier and filtering shaping circuit composition.
- 3. the high-precision detection device of Larmor's magnetic resonance signal according to claim 2, it is characterised in that described is thick Modulate circuit is surveyed, its high-precision noise reduction filtering circuit uses 7 rank Low-pass Elliptic Filters, and Rameau is surveyed in filter input end reception That magnetic resonance signal；Its filtering shaping circuit output termination FPGA frequency measurement module.
- 4. the high-precision detection device of Larmor's magnetic resonance signal according to claim 2, it is characterised in that described essence Modulate circuit is surveyed, its high-performance low pass filter is mainly made up of operational amplifier UA741, the input termination mixing of the wave filter Device；Its filtering shaping circuit output termination FPGA frequency measurement module.
- 5. the high-precision detection device of Larmor's magnetic resonance signal according to claim 1, it is characterised in that described FPGA uses EP3SL70F780C2 chips.
- 6. the high-precision detection device of Larmor's magnetic resonance signal according to claim 1, it is characterised in that described height Precision radio frequency source, which is that a kind of thermostatic control taming using the small-sized rubidium atomic clocks of 10MHz and GPS/ Big Dippeves dual mode signal is voltage-controlled, to shake Device OC-VCXO is swung, it is as high-precision radio frequency source obtained by multiple duplication timing reference input frequency multiplication.
- 7. the high-precision detection device of Larmor's magnetic resonance signal according to claim 1, it is characterised in that described is mixed Frequency device uses AD835 analog multipliers.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554333A (en) * | 2019-02-21 | 2019-12-10 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | digital detection system for optical magnetic resonance signals of potassium optical pump magnetometer |
| CN113848384A (en) * | 2021-09-22 | 2021-12-28 | 浙江大学 | High-precision feedback type frequency measuring device and method based on phase frequency detector |
-
2017
- 2017-04-18 CN CN201720408228.3U patent/CN206710579U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554333A (en) * | 2019-02-21 | 2019-12-10 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | digital detection system for optical magnetic resonance signals of potassium optical pump magnetometer |
| CN113848384A (en) * | 2021-09-22 | 2021-12-28 | 浙江大学 | High-precision feedback type frequency measuring device and method based on phase frequency detector |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 Termination date: 20200418 |