CN106443810A - High-precision data conversion and acquisition system suitable for gravimeter - Google Patents
High-precision data conversion and acquisition system suitable for gravimeter Download PDFInfo
- Publication number
- CN106443810A CN106443810A CN201610305150.2A CN201610305150A CN106443810A CN 106443810 A CN106443810 A CN 106443810A CN 201610305150 A CN201610305150 A CN 201610305150A CN 106443810 A CN106443810 A CN 106443810A
- Authority
- CN
- China
- Prior art keywords
- gravimeter
- acquisition system
- input buffer
- data conversion
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
- G01V7/02—Details
- G01V7/06—Analysis or interpretation of gravimetric records
Abstract
The invention belongs to the field of geological exploration, and particularly relates to a high-precision data conversion and acquisition system suitable for a gravimeter. The system comprises a signal attenuator, an input buffer, a differential input buffer, an analog-to-digital converter, a voltage reference source and a signal acquisition device. The output end of the signal attenuator is connected with the input end of the input buffer. The output end of the input buffer is connected with the input end of the differential input buffer. The output end of the differential input buffer is connected with the input end of the analog-to-digital converter. The output end of the analog-to-digital converter is connected with the input end of the signal acquisition device. The voltage reference source is connected with the input end of the analog-to-digital converter. According to the system, the slight variation of gravity can be measured in a high-sensitivity and high-resolution manner so as to guarantee high-precision gravity measurement of the gravimeter.
Description
Technical field
The invention belongs to geological exploration field, especially a kind of high accuracy data conversion being applied to gravimeter and collection system
System.
Background technology
Gravimeter is used to measure the instrument of acceleration of gravity, can be divided into absolute gravimeter and relative gravity instrument two class,
The former is used for measuring the absolute gravity accekeration of a bit, and the absolute gravity acceleration that the latter is used for measuring at 2 points is poor.Due to it
There is higher sensitivity can experience and small Gravity changer, can be widely used for the measurement of earth gravitational field, earth tide is seen
In the work of the items such as survey, crust deformation measurement, and gravimetric prospecting.
When carrying out geological exploration, need to carry out high-precision gravity measurement, Measurement Resolution very high it is necessary to reach
To 10-6More than gal, meet high-acruracy survey.
In view of this, the special proposition present invention.
Content of the invention
The present invention provides a kind of high accuracy data conversion being applied to gravimeter and acquisition system.
A kind of high accuracy data conversion being applied to gravimeter and acquisition system, described system includes signal attenuator, defeated
Enter buffer, differential input buffer, analog-digital converter (AD converter), voltage-reference and signal picker, described signal
The outfan of attenuator connects the input of described input buffer, and the outfan of described input buffer connects Differential Input and delays
Rush the input of device, the outfan of described differential input buffer connects the input of analog-digital converter, described analog-digital converter
Outfan connect signal picker input；Described voltage-reference is connected to analog-digital converter input.
The signal amplitude obtaining after signal attenuator decay reduces；The signal that amplitude reduces enters input buffer impedance
Signal Matching, stops the loss of signal；It is converted into 2 after input buffer signal out enters differential input buffer to have
Differential wave；Enter AD converter from differential input buffer differential wave out, pressure signal is changed into computer can
The digital signal of identification；Digital signal carries out subsequent treatment after being collected into signal picker.
Further, the circuit of described signal attenuator includes operational amplifier.
Further, the amplitude after the decay of described signal attenuator is 0～5V.
Gravity sensor output signal is direct current signal, and output amplitude scope is ± 18V, and so high voltage signal can not
It is directly inputted to AD converter it is necessary to 0～5V is decayed to by attenuator circuit general ± 18V, by AD converter by 0～5V's
Analogue signal is converted into digital quantity, is sent to computer and carries out subsequent treatment.
Further, adopt AD8675 in the circuit of described input buffer as buffer amplifier.
In order to allow analog-digital converter reach high precision, the key factor that during selection buffer amplifier, needs consider is：Suitable
When bandwidth, Slew Rate, VP-P output, low noise, low distortion and low imbalance.Alap buffer amplifier noise should be kept
SNR well below ADC.The general disturbance error of amplifier, including drift, all should be less than required in whole temperature range
Trueness error.Based on considerations above, meticulously have selected AD8675 as buffer amplifier.
Further, adopt LT1368 operational amplifier in the circuit of described differential input buffer, LT1368 has relatively
High common mode rejection ratio, extremely low input offset voltage, double followers are used as the differential input buffer of ADC, Ke Yiyou
Effect eliminates the impact of offset voltage.
Further, described analog-digital converter is 24 analog-digital converters.
Preferably, described analog-digital converter is LTC2445AD, and this transducer has the linearity of 2ppm, and 24 no leak code；
The full scale gain error of 2.5ppm, the offset error of 0.1ppm, the superior direct-current performance such as noise of 0.16ppm and good low noise
Sound characteristicses；The input circuit bufferless of this transducer, input voltage can exceed 12.5%, Ke Yifang of reference voltage range
Just solve the problems, such as to outrange the measurement with negative voltage；The maximum feature compared with other transducers of this transducer is monocycle zero point
Transparent with full scale calibration, it is not required to the automatic calibration that user program participates in ADC, using extremely convenient.Additionally, this transducer has
SPI digital interface.
Binding signal input interface circuit, the external differential buffers of input circuit of transducer, constitute 24,8 passage high-precision
Degree adc data acquisition system.
Further, described voltage-reference is divided into+5V reference voltage and+2.5V reference voltage.
Further, described voltage-reference adopts MAX6350 chip, and MAX6350 has ultra-low temperature drift coefficient, such as
1ppm/ DEG C, extremely low noise level, 1.5 μ Vp-p (0.1Hz～10Hz)；Long-time stability reaches 30ppm/1000hr.
Further, there is inside described signal picker the higher integrated oscillator clock of precision, outside is not required to any
Frequency adjustment element, internal quadravalence digital notch filter has the decay energy of minimum 87dB to the signal of 50Hz/60Hz
Power.
After technique scheme, the present invention compared with prior art has the advantages that：This system can be high
Small Gravity changer is measured in sensitivity, high-resolution it is ensured that the high-precision gravity measurement of gravimeter.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the circuit diagram of signal attenuator；
Fig. 3 is the circuit diagram of input buffer；
Fig. 4 is the circuit diagram of voltage-reference；
Fig. 5 is the circuit of differential input buffer；
Fig. 6 is the circuit of signal picker.
Specific embodiment
Below in conjunction with specific embodiments and the drawings, explanation is further explained to the present invention.
A kind of high accuracy data conversion being applied to gravimeter and acquisition system, as shown in figure 1, described system includes signal
Attenuator 1, input buffer 2, differential input buffer 3,24 bit A/D converters 4, voltage-reference 6 and signal picker 5, institute
The outfan stating signal attenuator 1 connects the input of described input buffer 2, and the outfan of described input buffer 2 connects
The input of differential input buffer 3, the outfan of described differential input buffer 3 connects the input of 24 bit A/D converters 4,
The outfan of described 24 bit A/D converters 4 connects the input of signal picker 5；Described voltage-reference 6 is connected to 24 AD
Transducer 4 input.
Wherein, the circuit of described signal attenuator 1 is made up of U10, C1, C2, C3, R1, R2, R3, as shown in Fig. 2 wherein
R3/R1=3/20；R3/R2=1/2；
The circuit of described input buffer 2 is made up of U11, C2, R4, R5, R6, as shown in Figure 3；
The circuit of described voltage-reference 6 is by the components and parts group such as U4, U5, RT1, RN1A, RN1B, C11, C12, C13, C14
Become, as shown in Figure 4；
The circuit of described differential input buffer 3 is made up of components and parts such as U2A, U2B, C3, C4, C5, as shown in Figure 5；
The circuit of described signal picker 5 is made up of components and parts such as U1, U2B, C3, C4, as shown in Figure 6.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of high accuracy data conversion being applied to gravimeter and acquisition system are it is characterised in that described system includes signal
Attenuator, input buffer, differential input buffer, analog-digital converter, voltage-reference and signal picker, described signal declines
The outfan subtracting device connects the input of described input buffer, and the outfan of described input buffer connects Differential Input buffering
The input of device, the outfan of described differential input buffer connects the input of analog-digital converter, described analog-digital converter
Outfan connects the input of signal picker；Described voltage-reference is connected to analog-digital converter input.
2. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that described
The circuit of signal attenuator includes operational amplifier.
3. the high accuracy data being applied to gravimeter as claimed in claim 2 is changed with acquisition system it is characterised in that passing through
Amplitude after described signal attenuator decay is 0～5V.
4. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that described
AD8675 is adopted as buffer amplifier in the circuit of input buffer.
5. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that described
LT1368 operational amplifier is adopted in the circuit of differential input buffer.
6. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that described
Analog-digital converter is 24 analog-digital converters.
7. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 6 with acquisition system it is characterised in that described
Analog-digital converter is LTC2445AD.
8. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that described
Voltage-reference is divided into+5V reference voltage and+2.5V reference voltage.
9. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 8 with acquisition system it is characterised in that described
Voltage-reference adopts MAX6350 chip.
10. it is applied to the high accuracy data conversion of gravimeter as claimed in claim 1 with acquisition system it is characterised in that institute
State signal picker and include integrated oscillator clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305150.2A CN106443810A (en) | 2016-05-10 | 2016-05-10 | High-precision data conversion and acquisition system suitable for gravimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305150.2A CN106443810A (en) | 2016-05-10 | 2016-05-10 | High-precision data conversion and acquisition system suitable for gravimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106443810A true CN106443810A (en) | 2017-02-22 |
Family
ID=58183137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610305150.2A Pending CN106443810A (en) | 2016-05-10 | 2016-05-10 | High-precision data conversion and acquisition system suitable for gravimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106443810A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285782A (en) * | 2020-11-05 | 2021-01-29 | 中国石油天然气集团有限公司 | Near-surface seismic wave absorption attenuation investigation method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2718598Y (en) * | 2004-06-30 | 2005-08-17 | 中国科学院测量与地球物理研究所 | Data collecting recording device for multi-channel sea gravity meter |
| CN1693925A (en) * | 2004-06-30 | 2005-11-09 | 中国科学院测量与地球物理研究所 | Multifunction data collecting system for marine gravitometer |
| CN102508318A (en) * | 2011-09-30 | 2012-06-20 | 浙江大学 | Precise inclined platform device for static calibration of seismometer |
| US20130161504A1 (en) * | 2011-12-21 | 2013-06-27 | Schlumberger Technology Corporation | Systems and Methods Using Tandem Gravimeter |
| US20150128696A1 (en) * | 2012-11-10 | 2015-05-14 | Joe Foreman | Superconducting Acceleration Sensor Suitable For Gravitational Wave Radiation Detection |
-
2016
- 2016-05-10 CN CN201610305150.2A patent/CN106443810A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2718598Y (en) * | 2004-06-30 | 2005-08-17 | 中国科学院测量与地球物理研究所 | Data collecting recording device for multi-channel sea gravity meter |
| CN1693925A (en) * | 2004-06-30 | 2005-11-09 | 中国科学院测量与地球物理研究所 | Multifunction data collecting system for marine gravitometer |
| CN102508318A (en) * | 2011-09-30 | 2012-06-20 | 浙江大学 | Precise inclined platform device for static calibration of seismometer |
| US20130161504A1 (en) * | 2011-12-21 | 2013-06-27 | Schlumberger Technology Corporation | Systems and Methods Using Tandem Gravimeter |
| US20150128696A1 (en) * | 2012-11-10 | 2015-05-14 | Joe Foreman | Superconducting Acceleration Sensor Suitable For Gravitational Wave Radiation Detection |
Non-Patent Citations (1)
| Title |
|---|
| 段小霞: "手持式地震波检波器测试仪研制", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285782A (en) * | 2020-11-05 | 2021-01-29 | 中国石油天然气集团有限公司 | Near-surface seismic wave absorption attenuation investigation method and device |
| CN112285782B (en) * | 2020-11-05 | 2023-04-25 | 中国石油天然气集团有限公司 | Near-surface seismic wave absorption attenuation investigation method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102539831B (en) | Signal conversion device for accelerometer in strapdown inertial navigation system | |
| CN110987198B (en) | Space remote sensing infrared detector focal plane temperature precision measurement system | |
| CN101446494A (en) | Temperature detection circuit for satellite-borne optical fiber gyroscope | |
| CN109510625A (en) | A kind of high-precision AD sampling of quartz flexible accelerometer and conversion circuit | |
| CN102506859B (en) | Gyro signal acquisition circuit and signal filtering system for three-axis inertially-stabilized platform | |
| CN103519807A (en) | Brain electricity collecting device | |
| CN106443810A (en) | High-precision data conversion and acquisition system suitable for gravimeter | |
| CN104808064A (en) | Triangular wave excited Wheatstone bridge measuring circuit | |
| CN110530547A (en) | A kind of micro- K magnitude temperature measuring device based on Wheatstone bridge and lock-in amplifier | |
| CN102206996A (en) | Weak signal detector | |
| CN218886023U (en) | Low-noise ADC multifunctional time-frequency parameter comprehensive tester | |
| CN104713579A (en) | Universal type sensor signal processing system | |
| CN106950400A (en) | A kind of MHD angular-rate sensors static noise measurement apparatus and method | |
| CN104748765B (en) | The X-ray pulsar navigation electronics read-out device of function is measured with energy level | |
| CN101013108B (en) | Bending unit measuring system | |
| CN106443808A (en) | High-precision electronic gravimeter suitable for geological exploration | |
| CN204214462U (en) | A kind of universal sensor signal processing system | |
| CN102426865A (en) | Fission chamber output signal digital processing system and method | |
| US3899668A (en) | Electronic wave analysis | |
| CN112865797A (en) | ADC-based high-precision sampling system | |
| CN208060013U (en) | A kind of environment noise test device | |
| CN111208346A (en) | Small signal voltage measuring device and method | |
| CN206818746U (en) | A kind of MHD angular-rate sensors static noise measurement apparatus | |
| CN206888970U (en) | One kind is based on all-wave collection SGR | |
| Liu et al. | A low-noise and low-power front-end readout ASIC for CZT detectors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |