CN202710755U - Geophysical exploration data acquisition station - Google Patents
Geophysical exploration data acquisition station Download PDFInfo
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- CN202710755U CN202710755U CN2012203600348U CN201220360034U CN202710755U CN 202710755 U CN202710755 U CN 202710755U CN 2012203600348 U CN2012203600348 U CN 2012203600348U CN 201220360034 U CN201220360034 U CN 201220360034U CN 202710755 U CN202710755 U CN 202710755U
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- programmable gate
- gate array
- acquisition station
- data acquisition
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Abstract
The utility model discloses a geophysical exploration data acquisition station, comprising a front-end analogue-to-digital conversion unit and a rear-end processing unit, the two of which are connected with each other, wherein the analogue-to-digital conversion unit is composed of a variable gain amplifier and an analogue-to-digital converter; and the processing unit is composed of a field-programmable gate array and a data transmission interface chip connected to the field-programmable gate array. The geophysical exploration data acquisition station is simple in structure, convenient for use, integrated with data acquisition and data transmission, high in integration level and accuracy, and low in noise and power consumption.
Description
Technical field
The utility model relates to earthquake data acquisition and transmission system, specifically a kind of geophysical survey data acquisition station.
Background technology
At present both at home and abroad the data acquisition system (DAS) in the most advanced seismic prospecting instrument surely belongs to 428 serial land system for acquiring seismic data of French Sercel company, marine seismic data acquisition system of CNOOC-" Hai Liang " system, land seismic detector system in the ES109 of PetroChina Company Limited. ten thousand roads etc.The acquisition system that also has in addition some other research institution's developments is such as the patent " seismic data collector " (application number 01142110.X) of China Seismology Bureau's Center for Analysis and Prediction application.
France Sercel company has accumulated many years of experience in seismic instrument development aspect by land, 428 series of its up-to-date release, and function is more powerful after improve on its basis of 408, and the collection plate power consumption is lower, and noise is also lower, and Dynamic Range is larger.Since trade secret, the specific implementation details of its unexposed its data acquisition unit, and the analog to digital converter that 428 serial acquisition stations adopt remains 24.This is the precision that current field of seismic exploration is generally used.Along with the development of high precision, high-resolution seismic exploration engineering, and the demand of complicated geological exploration, the precision of earthquake data acquisition module A/D converter (ADC) is had higher requirement.
CNOOC's " Hai Liang " collection nest plate that system for acquiring seismic data adopts Cirrus Logic company to produce, consist of the A/D conversion module with CS5372+CS5376, finish the analog to digital conversion of 24-bit, it is about 115dB at the dynamic range representative value under the 1ms sampling rate.Because modulator and wave filter be realization separately, acquisition system power consumption and area are all larger.Based on the needs of acquisition system variable gain, its front end adopts independently variable gain amplifier to process, and front end simulation system integrated level is low, causes the system noise platform high, and the pink noise value under the 1ms sampling rate is 2.5 μ V RMS.
The chip and the CNOOC that use in the ES109 of the PetroChina Company Limited. ten thousand road land seismic acquisition systems are similar, have the problem same with the system of CNOOC, and dynamic range is not high, and power consumption is large, and area is large, and level of integrated system is low.
That the A/D conversion chip that uses in the patent " seismic data collector " of China Seismology Bureau's Center for Analysis and Prediction application adopts also is a product of Cirrus Logic: CS5321+CS5322.The output word length is 24-bit, and under the 1ms typical case sampling rate, the Dynamic Range representative value is no more than 120dB.And acquisition station back-end processing unit has adopted digital signal processor TMS320C32, the system architecture relative complex, and dirigibility is relatively relatively poor.
As seen, at present the seismic prospecting instrument data acquisition system (DAS) generally adopts the 24-bit precision, and it is larger that system noise is affected by level of integrated system, usually has lower system noise based on the system of ASIC circuit, and Dynamic Range is large; And the front end analog to digital conversion system that makes up based on separate chip, then integrated level is poor, the system noise sound pitch.Along with the development of seismic prospecting instrument Development Techniques and the raising that the high-resolution seismic surveying accuracy is required, front end analog to digital conversion system need to be to high integration, low noise, high precision, the future development of low-power consumption.
The utility model content
The technical problems to be solved in the utility model provides a kind of geophysical survey data acquisition station, and it is simple in structure, has high integration, high precision, low noise advantage.
The technical solution of the utility model is:
A kind of geophysical survey data acquisition station comprises the analog to digital conversion unit of interconnective front end and the processing unit of rear end; Described analog to digital conversion unit is comprised of variable gain amplifier and analog to digital converter; Described processing unit is comprised of field programmable gate array and the data transmission interface chip that is connected on the field programmable gate array.
Described variable gain amplifier and analog to digital converter are selected ADS1282 conversion chip.
The front end of described analog to digital conversion unit is connected with simulation RC wave filter.
Described data transmission interface chip includes two symmetrically arranged command interfaces of relative field programmable gate array and two symmetrically arranged data-interfaces of relative field programmable gate array; Described data-interface is comprised of with the driver that is connected with parallel/serial converter the parallel/serial converter that is connected with field programmable gate array, and described command interface is comprised of with the balanced device that is connected with serial/parallel converter the serial/parallel converter that is connected with field programmable gate array.
Described driver is selected driver CLC001; Described balanced device is selected balanced device CLC012.
Advantage of the present utility model:
(1), the utlity model has the plurality of advantages such as high integration, high precision, low noise, low-power consumption; Under 1ms typical case sampling rate, the permission input signal amplitude is 5Vpp, the system noise representative value is 1.1 μ V RMS, according to dynamic range computing formula: DR=20log10 (Srms/Nrms), Srms is input signal RMS value, Nrms is noise RMS value after calculating, and can get thus Dynamic Range is 124dB.A/D conversion output word length is the 31-bit high precision, and system's single track analog power consumption is about 30mW, and " " system's single track analog power consumption is about 56mW to Hai Liang, and power consumption reduces approximately half with respect to CNOOC; Because Sercel 428 series and PetroChina Company Limited.'s ES109 instrument are open simulation part and realize details, can't carry out the power consumption contrast.
(2), the utility model compact conformation is succinct, consisted of by the collecting unit of front end and the processing unit of rear end on the general frame, gain-variable is finished by one single chip in the front-end collection unit, the A/D conversion, the integrated variable gain amplifier of ADS1282 conversion chip internal that adopts, support simultaneously the multiple signals input, thereby the test signal input channel is provided for the acquisition station self check, avoid adopting analog switch to introduce additional noise and signal distortion, except the integrated variable gain amplifier in inside, employed ADS1282 conversion chip is supported the variable sampling rate simultaneously, chip is finally exported 31-bit high precision transformation results, simultaneously in order to satisfy the interface needs of existing instrument back-end processing unit, chip is exportable 24-bit transformation results also, greatly promoted the dirigibility of acquisition station, giving entirely, the transmission system design of seismic exploration system also provides great dirigibility; The collecting unit of rear end is made of field programmable gate array (FPGA) and data transmission interface chip, the utility model can adapt to the design requirement of the middle-size and small-size seismic prospecting instruments such as single station multiple tracks, also can adapt to simultaneously the design requirement of the large-scale seismic prospecting instrument such as single station single track, have very large dirigibility and extendability on the structure.
(3), data transmission interface chip described in the utility model adopted the symmetrical expression design, acquisition station is not distinguished directivity, this provides greatly convenient to field construction, has improved the efficient of field work.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model short circuit noise testing.
Fig. 3 is that the noise amplitude that obtains after the utility model short circuit noise testing is with the spectrogram of frequency change.
Embodiment
See Fig. 1, a kind of geophysical survey data acquisition station comprises the analog to digital conversion unit of interconnective front end and the processing unit of rear end; The analog to digital conversion unit comprises simulation RC wave filter 1 and the ADS1282 conversion chip 2 that connects in turn; Processing unit is comprised of field programmable gate array 3 and the data transmission interface chip that is connected on the field programmable gate array 3, and reportedly defeated interface chip includes two relative field programmable gate array 3 symmetrically arranged command interfaces field programmable gate array 3 symmetrically arranged data-interfaces relative to two; Data-interface is comprised of with the driver CLC001 5 that is connected with parallel/serial converter 4 the parallel/serial converter 4 that is connected with field programmable gate array, and command interface is comprised of with the balanced device CLC012 7 that is connected with serial/parallel converter 6 the serial/parallel converter 6 that is connected with field programmable gate array 3.
See Fig. 2, acquisition station short circuit noise testing circuit comprises field programmable gate array 3, and tested ADS1282 conversion chip 2 and data upload interface RS232 8 form.Data upload interface RS232 8 is the acquisition station external circuit, directly drives by field programmable gate array 3, and test data is passed to PC analysis.Test circuit has utilized the original inside chip of acquisition station except outside RS232 8, change connected mode by control chip internal register value, test acquisition station system noise.Acquisition station has the low noise characteristics, this test circuit has provided the connected mode of acquisition station noise testing, by the configuration of control ADS1282 conversion chip 2 internal registers, ADS1282 conversion chip 2 can be set be input as resistance and be shorted to ground, in order to test the short circuit noise of acquisition station.ADS1282 conversion chip 2 input ends pull down to ground by 400ohm resistance, after obtaining ADS1282 conversion chip 2A/D transformation results, the result that field programmable gate array 3 will collect is uploaded to PC by RS232 8, adopt professional software to carry out noise calculation at PC, obtain system short-circuit noise RMS value.It is 8192 that the calculating of adopting in the calculating is counted.
See Fig. 3, test the acquisition station short circuit noise FFT result of calculation that obtains according to Fig. 2 connected mode.Test result display noise platform calculates noise RMS value and is 1.1uV at-150dB, and can get dynamic range according to computing formula is about 124dB.
Principle of work of the present utility model:
(1), after acquisition station powers on, carry out initialization, each acquisition station numbering is mainly finished in initialization, uploads readyly for ensuing framing, avoids software chaotic when carrying out data recombination (sequential make a detour order).
(2), finish initialization after, wait for the quality control test command: quality control is namely before carrying out the real data collection, by the inner test waveform that produces of acquisition station Acquisition Circuit is tested, check quality and the indices situation of passage, this test is not carried out automatically by manual control, usually only need when beginning most, to test, in working afterwards, as long as topological structure does not change, all can skip.
(3), after the difficulty action accomplishment control test, acquisition station enters normal workflow, wait for user command: field programmable gate array 3 sends by command interface and starts acquisition and stop acquisition etc., starts framing uploading data order etc. by data-interface.
In order to reduce power consumption, acquisition station does not carry out the A/D conversion after powering on usually, needs configuration order to start ADC and carries out the analog to digital conversion operation, can stop the A/D conversion just need configuration to cease and desist order after starting.
Claims (5)
1. a geophysical survey data acquisition station is characterized in that: comprise the analog to digital conversion unit of interconnective front end and the processing unit of rear end; Described analog to digital conversion unit is comprised of variable gain amplifier and analog to digital converter; Described processing unit is comprised of field programmable gate array and the data transmission interface chip that is connected on the field programmable gate array.
2. a kind of geophysical survey data acquisition station according to claim 1, it is characterized in that: described variable gain amplifier and analog to digital converter are selected ADS1282 conversion chip.
3. a kind of geophysical survey data acquisition station according to claim 1 is characterized in that: the front end of described analog to digital conversion unit is connected with simulation RC wave filter.
4. a kind of geophysical survey data acquisition station according to claim 1, it is characterized in that: described data transmission interface chip includes two symmetrically arranged command interfaces of relative field programmable gate array and two symmetrically arranged data-interfaces of relative field programmable gate array; Described data-interface is comprised of with the driver that is connected with parallel/serial converter the parallel/serial converter that is connected with field programmable gate array, and described command interface is comprised of with the balanced device that is connected with serial/parallel converter the serial/parallel converter that is connected with field programmable gate array.
5. a kind of geophysical survey data acquisition station according to claim 4, it is characterized in that: described driver is selected driver CLC001; Described balanced device is selected balanced device CLC012.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203600348U CN202710755U (en) | 2012-07-24 | 2012-07-24 | Geophysical exploration data acquisition station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203600348U CN202710755U (en) | 2012-07-24 | 2012-07-24 | Geophysical exploration data acquisition station |
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| Publication Number | Publication Date |
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| CN202710755U true CN202710755U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012203600348U Expired - Fee Related CN202710755U (en) | 2012-07-24 | 2012-07-24 | Geophysical exploration data acquisition station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809759A (en) * | 2012-07-24 | 2012-12-05 | 合肥国为电子有限公司 | Geophysical exploration data acquisition station |
| CN104678456A (en) * | 2015-02-14 | 2015-06-03 | 合肥国为电子有限公司 | Geophysical exploration instrument with electromagnetic and seismic data acquisition function |
| CN104730573A (en) * | 2015-03-19 | 2015-06-24 | 桂林电子科技大学 | Acquisition method and device for micro-seismic signals within large dynamic range |
| CN105068115A (en) * | 2015-08-26 | 2015-11-18 | 连云港杰瑞自动化有限公司 | Data collection system of petroleum seismic exploration |
-
2012
- 2012-07-24 CN CN2012203600348U patent/CN202710755U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809759A (en) * | 2012-07-24 | 2012-12-05 | 合肥国为电子有限公司 | Geophysical exploration data acquisition station |
| CN102809759B (en) * | 2012-07-24 | 2014-09-24 | 合肥国为电子有限公司 | Geophysical exploration data acquisition station |
| CN104678456A (en) * | 2015-02-14 | 2015-06-03 | 合肥国为电子有限公司 | Geophysical exploration instrument with electromagnetic and seismic data acquisition function |
| CN104730573A (en) * | 2015-03-19 | 2015-06-24 | 桂林电子科技大学 | Acquisition method and device for micro-seismic signals within large dynamic range |
| CN104730573B (en) * | 2015-03-19 | 2017-05-31 | 桂林电子科技大学 | The microseismic signals acquisition method and equipment of a kind of HDR |
| CN105068115A (en) * | 2015-08-26 | 2015-11-18 | 连云港杰瑞自动化有限公司 | Data collection system of petroleum seismic exploration |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20130130 Termination date: 20160724 |