CN206618849U - A kind of optical pumped magnetometer magnetic gradient measurements device - Google Patents
A kind of optical pumped magnetometer magnetic gradient measurements device Download PDFInfo
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- CN206618849U CN206618849U CN201720414115.4U CN201720414115U CN206618849U CN 206618849 U CN206618849 U CN 206618849U CN 201720414115 U CN201720414115 U CN 201720414115U CN 206618849 U CN206618849 U CN 206618849U
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- fpga
- pumped magnetometer
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- optical pumped
- magnetic gradient
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Abstract
The utility model discloses a kind of optical pumped magnetometer magnetic gradient measurements device, magnetometer probe output signal first passes around impedance matching network in the utility model, and signal is carried out to input FPGA after impedance matching, filter shape.The signal that two-way magnetometer probe is exported is gathered by FPGA, sampled with identical gate clock control signal, it is ensured that the synchronization of two paths of signals.PPS signal is exported with by way of constant-temperature crystal oscillator cooperation, obtaining and being alignd with latitude and longitude coordinates information to collection magnetic field signal increase timestamp GPS.The utility model realizes collection and the record of magnetic gradient information, and emphasis solves the synchronous acquisition of multi-channel data.
Description
Technical field
The utility model is related to magnetic survey technical field, more particularly to a kind of optical pumped magnetometer magnetic gradient measurements device.
Background technology
It is generally optical pumping magnetic resultant field detection method in the prior art, this method is disturbed larger by ambient field, and optical pumping magnetic measurement
Journey is limited, when survey area's changes of magnetic field is larger, the easy losing lock of optical pumping.As the fields such as geological prospecting, military and national defense are to magnetic detection
Precision, speed, stability requirement are gradually stepped up, and existing magnetic survey system can not meet requirement.
Magnetic gradient survey technology has high resolution, is not disturbed etc. and influences by geomagnetic diurnal change and magnetic storm, can effectively suppress
Magnetic ambient field is disturbed, so as to obtain magnetic anomaly information, and magnetic gradient survey can clearly differentiate magnetic anomaly body position and
Border.
Magnetic gradient survey needs to make the difference multiple magnetometer probe data, and magnetic field gradient test platform is typically motion
, this is accomplished by the synchronism for ensureing multi-channel data acquisition.Optical pumping magnetometer is output as frequency signal, high-precision frequency
Collection needs to use FPGA to complete, and the storage of GPS latitude and longitude coordinates is completed on single-chip microcomputer, passes through string between two parts
Mouth carries out data transmission, but clock is separate, it is necessary to which the data syn-chronization completed under two clock systems is aligned.
It can be seen that have during magnetic gradient measurements two major issues need solution, one be exactly Multi probe data synchronization
Collection, another is exactly the alignment of probe data and gps coordinate.
The content of the invention
The purpose of this utility model is on the basis of existing caesium optical pumped magnetometer is popped one's head in, and designs acquisition system, builds
The magnetic gradient measurements device of a set of high accuracy, high stability.
To achieve the above object, the technical solution adopted in the utility model is：
A kind of optical pumped magnetometer magnetic gradient measurements device, it is important to：Including optical pumped magnetometer probe, impedance matching network,
FPGA frequency measurement circuits, storage display circuit and GPS that the constant-temperature crystal oscillator being connected by FPGA and with FPGA is constituted；
Optical pumped magnetometer probe is connected after impedance matching network with FPGA signal input part；
The storage display circuit includes the ARM single-chip microcomputers being connected with FPGA, and be connected respectively with ARM single-chip microcomputers
LCD display and SD card；
Signal input parts of the GPS respectively with FPGA and ARM single-chip microcomputers is connected, FPGA receive GPS PPS pps pulse per second signals and
The frequency signal of constant-temperature crystal oscillator output, ARM single-chip microcomputers receive the time scale information that GPS is sent.
Wherein caesium optical pumped magnetometer probe is main sensing element, exports current location magnetic field signal.
Impedance matching network carries out matching shaping to optical pumping probe output, is input to frequency measurement circuit.
Frequency measurement circuit provides clock using FPGA as main measurement device, using constant-temperature crystal oscillator for frequency measurement circuit to be believed
Number, it is ensured that the accuracy and stability of measurement.
Storage is main controlling element using single-chip microcomputer with display circuit, when receiving Magnetic Field and the GPS of FPGA collections
Between and coordinate, shown and stored using SD card using LCD display.
GPS provides standard time and latitude and longitude coordinates for gradient acquisition system.
Further, the ARM single-chip microcomputers are STM32.
Further, the FPGA receives the frequency signal of constant-temperature crystal oscillator, carries out fixed frequency after scaling down processing
Pulse signal as frequency measurement module gate pulse.This gate pulse is that the end signal measured as the last time is also next survey
The open signal of amount.With the fixed gate Pulse Width Control sampling time, the signal of steady and continuous is realized while precision is ensured
Output.
Further, the FPGA receives GPS PPS pps pulse per second signals as initial pulse, to constant-temperature crystal oscillator arteries and veins
Capable counting is rushed in, measurement gate time, as pulse is terminated, stops counting.FPGA rises this count value with frequency values one
STM32 single-chip microcomputers are sent to, the relative instant sampled and completed can be calculated by this Counter Value and PPS pulse per second (PPS)s.In STM32
The collection absolute moment of respective frequencies can be calculated according to the relative time of record and GPS time stamp information.Utilize STM32 single-chip microcomputers
Over-sampling is carried out to GPS time and coordinate information.Afterwards using temporal information as standard, by the frequency values collected and coordinate
It is corresponding.
Further, the model of the FPGA is EP4CE6E22.
Further, the optical pumped magnetometer is popped one's head at least provided with two groups, respectively optical pumped magnetometer probe one, optical pumping
Magnetometer probe two.
Magnetometer probe output signal first passes around impedance matching network in the utility model, and impedance is carried out to signal
Match somebody with somebody, FPGA is inputted after filter shape.The signal that two-way magnetometer probe is exported is gathered by FPGA, with clock during identical gate
Signal sampling processed, it is ensured that the synchronization of two paths of signals.By way of GPS exports PPS signal and constant-temperature crystal oscillator coordinates, to collection magnetic
Field signal increase timestamp is obtained to align with latitude and longitude coordinates information.The utility model realizes collection and the note of magnetic gradient information
Record, emphasis solves the synchronous acquisition of multi-channel data.
For apparent description technology implementation process of the present utility model, brief Jie is done to the accompanying drawing used in description below
Continue.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is to be based on synchronous acquisition timing diagram of the present utility model.
Embodiment
Following examples are used to illustrate the utility model, but are not limited to scope of the present utility model.
As shown in figure 1, present embodiment by optical pumping probe 1, optical pumping probe 2, impedance matching network 3, constant-temperature crystal oscillator 4,
Fpga chip 5, GPS6, STM32 controller 7, SD card 8 and LCD display 9 are constituted.
What wherein optical pumping probe 1 and optical pumping popped one's head in 2 outputs is Larmor frequency signal, after impedance matching network 3
It is input in FPGA5 and carries out frequency measurement.For ensure measurement result it is steady in a long-term, from constant-temperature crystal oscillator 4 as FPGA5 when
Zhong Yuan.The PPS pulse per second (PPS)s of the GPS6 signals of the collection of FPGA frequency meters 5 simultaneously are used as timing signal.FPGA is by the frequency after survey calculation
Rate value is sent to STM32 single-chip microcomputers 7 by serial ports.STM32 single-chip microcomputers 7 are by the frequency values received and GPS location temporal information
Encapsulation write-in SD card 8 is stored together.LCD display 9 shows current two passages Magnetic Field in real time, to judge optical pumping magnetic
Whether power instrument probe locks.
FPGA frequency meters 5 carry out frequency measurement by the way of digital interpolative, and the output pulse to constant-temperature crystal oscillator 4 is divided
Frequency forms gate pulse signal, and each gate pulse is the end signal of last measurement, is also the beginning measured next time
Signal, with this fixed intervals, the output metrical information of continuous-stable.
The PPS pulse per second (PPS)s that FPGA frequency meters 5 are sent using GPS6 is timing signals, in pulse per second (PPS) time interval, to constant temperature
The high-frequency impulse that crystal oscillator 4 is sent carries out cumulative subdivision timing.
As shown in Fig. 2 when PPS pulse per second (PPS)s arrive, opening counter, constant-temperature crystal oscillator output high-frequency impulse is counted
Number.When signal strobe pulse arrives, Counter Value N is stored.FPGA5 together sends out the magnetic field value of this N value and measurement
Give STM32 single-chip microcomputers 7 and carry out display storage.
STM32 single-chip microcomputers 7 receive the information that FPGA5 is sent by serial ports.Another serial ports passage is with higher sampling simultaneously
Rate receives GPS6 time and positional information.
STM32 single-chip microcomputers 7 can be calculated according to t=N/f the measurement of FPGA frequency meters 5 magnetic field value sampling terminate relative to
The relative time of PPS pulse per second (PPS)s, and then end point absolute time is calculated according to the gps time of collection stamp.Wherein f is high-frequency impulse
Frequency values.
The absolute timestamp that magnetic field value according to collecting is carried is combining the gps time and latitude and longitude information of over-sampling,
The magnetic field value collected can be corresponded to latitude and longitude coordinates.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (6)
1. a kind of optical pumped magnetometer magnetic gradient measurements device, it is characterised in that：Including optical pumped magnetometer probe, impedance matching net
FPGA frequency measurement circuits, storage display circuit and GPS that network, the constant-temperature crystal oscillator being connected by FPGA and with FPGA are constituted；
Optical pumped magnetometer probe is connected after impedance matching network with FPGA signal input part；
The storage display circuit includes the ARM single-chip microcomputers being connected with FPGA, and the LCD being connected respectively with ARM single-chip microcomputers
Display screen and SD card；
Signal input parts of the GPS respectively with FPGA and ARM single-chip microcomputers is connected, and FPGA receives GPS PPS pps pulse per second signals and constant temperature
The frequency signal of crystal oscillator output, ARM single-chip microcomputers receive the time scale information that GPS is sent.
2. a kind of optical pumped magnetometer magnetic gradient measurements device according to claim 1, it is characterised in that：The ARM monolithics
Machine is STM32.
3. a kind of optical pumped magnetometer magnetic gradient measurements device according to claim 1, it is characterised in that：The FPGA is received
The frequency signal of constant-temperature crystal oscillator, carry out scaling down processing after using the pulse signal of fixed frequency as frequency measurement module gate pulse.
4. a kind of optical pumped magnetometer magnetic gradient measurements device according to claim 1, it is characterised in that：The FPGA is received
PPS pps pulse per second signals to GPS are counted as initial pulse to constant-temperature crystal oscillator pulse, and measurement gate time is used as end
Pulse, stops counting.
5. a kind of optical pumped magnetometer magnetic gradient measurements device according to claim 1, it is characterised in that：The type of the FPGA
Number it is EP4CE6E22.
6. a kind of optical pumped magnetometer magnetic gradient measurements device according to claim 1, it is characterised in that：The optical pumping magnetic force
Instrument probe at least provided with two groups, respectively optical pumped magnetometer probe one, optical pumped magnetometer probe two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720414115.4U CN206618849U (en) | 2017-04-19 | 2017-04-19 | A kind of optical pumped magnetometer magnetic gradient measurements device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720414115.4U CN206618849U (en) | 2017-04-19 | 2017-04-19 | A kind of optical pumped magnetometer magnetic gradient measurements device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562861A (en) * | 2018-03-30 | 2018-09-21 | 上海通用卫星导航有限公司 | A kind of symmetrical caesium optical pumped magnetometer for magnetic gradient measurements |
| CN110346740A (en) * | 2019-07-11 | 2019-10-18 | 中国地质大学（武汉） | A kind of Measurement Method for Magnetic Field of dynamic excitation magnetic gradiometer |
| CN111856350A (en) * | 2020-07-09 | 2020-10-30 | 吉林大学 | Non-shielding vector SERF atomic magnetic gradiometer adopting active magnetic field to offset |
| CN113655528A (en) * | 2021-08-05 | 2021-11-16 | 中国船舶重工集团公司第七一五研究所 | Backpack magnetic gradient measurement system |
-
2017
- 2017-04-19 CN CN201720414115.4U patent/CN206618849U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562861A (en) * | 2018-03-30 | 2018-09-21 | 上海通用卫星导航有限公司 | A kind of symmetrical caesium optical pumped magnetometer for magnetic gradient measurements |
| CN108562861B (en) * | 2018-03-30 | 2020-10-16 | 上海通用卫星导航有限公司 | Symmetrical cesium optical pump magnetometer for magnetic gradient measurement |
| CN110346740A (en) * | 2019-07-11 | 2019-10-18 | 中国地质大学（武汉） | A kind of Measurement Method for Magnetic Field of dynamic excitation magnetic gradiometer |
| CN111856350A (en) * | 2020-07-09 | 2020-10-30 | 吉林大学 | Non-shielding vector SERF atomic magnetic gradiometer adopting active magnetic field to offset |
| CN111856350B (en) * | 2020-07-09 | 2022-01-07 | 吉林大学 | Non-shielding vector SERF atomic magnetic gradiometer adopting active magnetic field to offset |
| CN113655528A (en) * | 2021-08-05 | 2021-11-16 | 中国船舶重工集团公司第七一五研究所 | Backpack magnetic gradient measurement system |
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