CN209055666U - A kind of signal acquisition circuit of digital geophone - Google Patents
A kind of signal acquisition circuit of digital geophone Download PDFInfo
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- CN209055666U CN209055666U CN201822157949.9U CN201822157949U CN209055666U CN 209055666 U CN209055666 U CN 209055666U CN 201822157949 U CN201822157949 U CN 201822157949U CN 209055666 U CN209055666 U CN 209055666U
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Abstract
The utility model provides a kind of signal acquisition circuit of digital geophone, its feature wide using MEMS shock sensor acquisition frequency band, processing is improved by the vibration signal that signal conditioning circuit acquires MEMS shock sensor to ensure signal sensitivity, after arriving required multiple greatly by programmable amplifier side, the noise signal of seismic band detection range or more is directly filtered out by low-pass filter, thus it may make amplification factor and seismic band detection range that can be needed and be set according to the detection of digital geophone, reach the detection frequency bandwidth requirement of needs, amplified again finally by difference amplifier and is converted to digital signal after reducing the fluctuation and drift of signal, avoid biggish signal distortion, promote anti-interference ability；The digitally seismic wave signal acquisition signal obtained in this way has the characteristics of small bandwidth, dynamic range big, high sensitivity, distortion, strong antijamming capability.
Description
Technical field
The utility model relates to physical prospecting seismic exploration technique field, in particular to a kind of signal of digital geophone is adopted
Collector.
Background technique
Method of seismic exploration is still the main means on land and seafari oil and natural gas at present, while being also it
The important exploitation method of his mineral resources, and be widely used in studying earth's internal structure, engineering exploration and detection, geological disaster
Prediction etc. etc..It is used to directly pick up earthquake vibration in seismic prospecting, and converts vibrations into and meet instrument record system need
The instrument for the form of energy wanted, referred to as geophone.Geophone can be divided into land geophone, marsh by use environment
Wave detector, marine detector and well geophone etc.；Induction (moving-coil type) wave detector, pressure can be divided by working principle
Electric wave detector, optical fiber detector and MEMS wave detector etc.；Velocity detector, acceleration can be divided by the physical quantity of output signal
Wave detector etc.；Analog detector and digital detector can be divided by the type of output signal.The index of geophone determines
The key technical indexes of seismic prospecting instrument.
Wherein MEMS is the english abbreviation of MEMS (Micro Electro Mechanical Systems), is one
Kind can be carried out the subminaturization mechanical devices of electronic induction or reaction.MEMS device can be carried out with semiconductor fabrication process is similar to
The mass production of relatively low cost.Currently, MEMS device is widely used in automation equipment (such as air bag inductor and engine
Various pressure sensors) and computer component (such as ink jet printer nozzles and disk read-write head) in.MEMS shock sensor
It is exactly the shock sensor using MEMS technology.
Most commonly used both at home and abroad at present is moving-coil seismic detector, and this wave detector has had development in 50 years to go through
History, weight develop to tens current gram-grades from initial thousands of gram-grades, are widely used in seismic prospecting.But due to
Its intrinsic mechanical features, this geophone sensitivity is low, dynamic range small (60dB or so), frequency band narrow (10~200Hz), resists
Interference performance is poor, quality and volume are all larger, and current seismic instrument has had reached the dynamic range of 120dB, so not
The effect of seismic instrument can be given full play to.It, generally will be many in order to improve sensitivity and the signal-to-noise ratio of detection seismic signal
Conventional wave detector (usually 12 to 72 or so) string is connected in parallel and is applied in combination, this is not only increased to construction
Labor intensity reduces production efficiency, also reduces exploration resolution.And field in its connecting cable transmit be
Analog signal, poor anti jamming capability.
Therefore, to develop that bandwidth, high sensitivity, dynamic range are big, distortion is small, anti-dry based on MEMS shock sensor
Disturb that ability is strong, digital geophone of long transmission distance, digitized signal acquisition circuit design is important technology pass
One of key point.
Utility model content
Aiming at the above shortcomings existing in the prior art, the purpose of this utility model is to provide a kind of digital seismics detections
The signal acquisition circuit of device, provides that bandwidth, high sensitivity, dynamic range are big, distortion is small, anti-interference for digital geophone
The strong digitally seismic wave signal acquisition basis of ability.
In order to achieve the above purposes, the technical solution adopted by the utility model is:
A kind of signal acquisition circuit of digital geophone, including MEMS shock sensor further include signal condition electricity
Road, programmable amplifier, low-pass filter, difference amplifier and A/D converter；The vibration signal of the MEMS shock sensor is defeated
Outlet is electrically connected to the amplified signal input terminal of programmable amplifier by signal conditioning circuit, and the amplified signal of programmable amplifier is defeated
Outlet is electrically connected to the amplifier signal input part of difference amplifier, the amplifier signal output of difference amplifier by low-pass filter
End is electrically connected to the input end of analog signal of A/D converter, and the digital signal output end of A/D converter is as digital seismics detection
Total output end of device signal acquisition circuit.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the signal conditioning circuit includes
Pre-filter circuit, biasing circuit and voltage follower circuit；Before the vibration signal output end of the MEMS shock sensor passes through
The input terminal that filter circuit is electrically connected to biasing circuit is set, the output end of biasing circuit is electrically connected to the input of voltage follower circuit
End, output end of the output end of voltage follower circuit as signal conditioning circuit.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the programmable amplifier is used
LTC6915 chip.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the low-pass filter is used
LTC1569-6 chip.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the A/D converter is used
ADS1271 chip.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the difference amplifier is complete poor
Divide operational amplifier circuit, amplifier signal input part of the positive input terminal of Differential OPAMP circuit as difference amplifier, Differential OPAMP
The negative input end and positive output end of circuit are grounded, amplifier signal of the positive output end of Differential OPAMP circuit as difference amplifier
Output end.
In the signal acquisition circuit of above-mentioned digital geophone, preferably, the Differential OPAMP circuit is adopted
With OPA1632 chip.
Compared with the prior art, the utility model has the following beneficial effects:
1, the signal acquisition circuit of the utility model digital geophone, it is wide using MEMS shock sensor acquisition frequency band
The characteristics of, after arriving required multiple greatly by programmable amplifier side, seismic band detection range is directly filtered out by low-pass filter
Thus above noise signal may make that amplification factor and seismic band detection range can be according to digital geophones
Detection is needed and is set, and is reached the detection frequency bandwidth requirement of needs, is amplified and dropped again finally by difference amplifier
It is converted to digital signal after the fluctuation and drift of low signal, avoids biggish signal distortion, promotes anti-interference ability；Such
To digitally seismic wave signal acquisition signal have that bandwidth, dynamic range be big, small, strong antijamming capability the spy of distortion
Point.
2, in the signal acquisition circuit of the utility model digital geophone, MEMS is shaken by signal conditioning circuit
The vibration signal of sensor acquisition is subject to conditioning processing, can preferably avoid the distortion of vibration signal, be more advantageous to rear onward encoding
The enhanced processing of amplifier is controlled, and guarantees that signal acquisition circuit has higher sensitivity.
3, in the signal acquisition circuit of the utility model digital geophone, difference amplifier preferably uses fully differential to transport
Electric discharge road, can preferably inhibit signal distortion, be more advantageous to the long distance transmission for signal.
Detailed description of the invention
Fig. 1 is the structural block diagram of the signal acquisition circuit of the utility model digital geophone.
Fig. 2 is a kind of physical circuit of pre-filter circuit in the signal acquisition circuit of the utility model digital geophone
The circuit theory schematic diagram of structure.
Fig. 3 is a kind of physical circuit of pre-filter circuit in the signal acquisition circuit of the utility model digital geophone
The circuit theory schematic diagram of embodiment.
Fig. 4 is that a kind of physical circuit of biasing circuit is implemented in the signal acquisition circuit of the utility model digital geophone
The circuit theory schematic diagram of mode.
Fig. 5 is a kind of physical circuit of voltage follower circuit in the signal acquisition circuit of the utility model digital geophone
The circuit theory schematic diagram of embodiment.
Fig. 6 is that a kind of physical circuit of programmable amplifier is real in the signal acquisition circuit of the utility model digital geophone
Apply the circuit theory schematic diagram of mode.
Fig. 7 is that a kind of physical circuit of low-pass filter is real in the signal acquisition circuit of the utility model digital geophone
Apply the circuit theory schematic diagram of mode.
Fig. 8 is that a kind of physical circuit of A/D converter is real in the signal acquisition circuit of the utility model digital geophone
Apply the circuit theory schematic diagram of mode.
Specific embodiment
The utility model provides a kind of signal acquisition circuit of digital geophone, as shown in Figure 1, including that MEMS shakes
Dynamic sensor, further includes signal conditioning circuit, programmable amplifier, low-pass filter, difference amplifier and A/D converter；It is described
The amplified signal that the vibration signal output end of MEMS shock sensor is electrically connected to programmable amplifier by signal conditioning circuit is defeated
Enter end, the amplified signal output end of programmable amplifier is inputted by the amplifier signal that low-pass filter is electrically connected to difference amplifier
End, the amplifier signal output end of difference amplifier are electrically connected to the input end of analog signal of A/D converter, the number of A/D converter
Total output end of the word signal output end as digital geophone signal acquisition circuit.
In this way, the simulation vibration signal of seismic wave is acquired by MEMS shock sensor, by the tune of signal conditioning circuit
After reason processing, signal method is carried out by programmable amplifier, programmable amplifier is also referred to as programmable gain amplifier, can pass through program
Control adjusts its gain amplification factor, therefore with flexibly adjustment gain and can make conditioning treated that vibration signal is amplified to
The amplification factor needed, then filters out the noise signal of seismic band detection range or more by low-pass filter, then passes through difference
While dividing amplifier to carry out secondary singal amplification, the fluctuation and drift of signal are reduced, believes simulation finally by A/D converter
Digital signal output number is converted to, as the total output signal of digital geophone signal acquisition circuit, to carry out number
The seismic detection of change detects.The feature wide using MEMS shock sensor acquisition frequency band as a result, is arrived greatly by programmable amplifier side
After required multiple, the noise signal of seismic band detection range or more is directly filtered out by low-pass filter, thus may make and put
Big multiple and seismic band detection range can be needed according to the detection of digital geophone and be set, and reach the inspection of needs
The requirement of frequency measurement bandwidth, such as frequency of seismic wave range are generally 0 ~ 400Hz, therefore the low-pass filtering of settable low-pass filter
Cutoff frequency is 400Hz, reaches the requirement of seismic wave full rate detection；Amplified and dropped again finally by difference amplifier
It is converted to digital signal after the fluctuation and drift of low signal, avoids biggish signal distortion, promotes anti-interference ability；Such
To digitally seismic wave signal acquisition signal have that bandwidth, dynamic range be big, small, strong antijamming capability the spy of distortion
Point.
In the signal acquisition circuit of the utility model digital geophone, the purpose of setting signal conditioning circuit is
Wish to be subject to conditioning processing by the vibration signal for acquiring MEMS shock sensor, to avoid the distortion of vibration signal as far as possible,
It is more advantageous to the enhanced processing of subsequent programmable amplifier, guarantees that signal acquisition circuit has higher sensitivity.Based on this purpose,
Specifically, as shown in Figure 1, signal conditioning circuit can be designed including pre-filter circuit, biasing circuit and voltage follow electricity
Road；The vibration signal output end of the MEMS shock sensor is electrically connected to the input of biasing circuit by pre-filter circuit
End, the output end of biasing circuit are electrically connected to the input terminal of voltage follower circuit, and the output end of voltage follower circuit is as signal
The output end of conditioning circuit.
In this way, believing first with pre-filter circuit the vibration that MEMS shock sensor acquires in signal conditioning circuit
Number it is subject to pre-filtering, filters out noise jamming, bias voltage is then corrected using biasing circuit, lowers distorted signals, then again
Using voltage follower circuit as being isolated between biasing circuit and subsequent programmable amplifier and buffering, the work of impedance matching is played
With, enable to rear subsequent programmable amplifying circuit preferably to work so that digital geophone signal acquisition electricity
Road integrally has higher sensitivity.Concrete application implement when, pre-filter circuit, biasing circuit, voltage follower circuit electricity
Schematic diagram difference in road is as shown in Figure 2, Figure 3 and Figure 4；In Fig. 2,3,4, AOUT is the vibration signal output end of MEMS shock sensor
Son label, ZOUT are pre-filter circuit output terminal label, and VL1 is biasing circuit output terminal label, and VL2 is voltage follow
Circuit output terminal label (namely signal conditioning circuit output terminal label).
When concrete application is implemented, programmable amplifier be can choose using Ya De promise semiconductor technology Co., Ltd (Analog
Devices, Inc, abbreviation ADI) LTC6915 chip, application circuit diagram it is as shown in Figure 5；In Fig. 5, VL2 is letter
Number conditioning circuit output terminal label, VL3 are that programmable amplifier output terminal marks.LTC6915 chip is more commonly may be used
Program gain amplifier part, using single 5V power supply power supply, have can any setting gain, voltage offsets lower than 10uV, temperature drift
Less than 50nV/ DEG C equal technological merits are moved, and hardware cost is more cheap.
When concrete application is implemented, low-pass filter is used and be can choose using Ya De promise semiconductor technology Co., Ltd
The circuit diagram of LTC1569-6 chip, application is as shown in Figure 6；In Fig. 6, VL3 is programmable amplifier output terminal label,
VL4 is first low pass filter output label.Single 3V or 5V power supply can be used in LTC1569-6 chip, and cutoff frequency is adjustable, most
The advantages of big cutoff frequency has offset current, drift current and bias current low up to 300kHz, wide dynamic range.
Difference amplifier preferably uses Differential OPAMP circuit, and the positive input terminal of Differential OPAMP circuit is as differential amplification
The amplifier signal input part of device, negative input end and the positive output end ground connection of Differential OPAMP circuit, Differential OPAMP circuit is just
Amplifier signal output end of the output end as difference amplifier.The advantage of Differential OPAMP circuit is that Differential Input, difference are defeated
Out, output voltage difference is that the input voltage of finite gain times is poor, is more advantageous to the long distance transmission for signal.Concrete application is real
Shi Shi, difference amplifier (Differential OPAMP circuit) can use Texas Instruments (Texas Instruments, abbreviation TI)
OPA1632 chip, application circuit diagram it is as shown in Figure 7；In Fig. 7, VL4 is first low pass filter output label,
AINP is Differential OPAMP circuit positive output terminal label, and AINN is Differential OPAMP circuit negative output terminal label.OPA1632
5V power supply power supply can be used in chip, and gain is adjustable, has the advantages that low noise, ultra-low-distortion, can preferably inhibit to believe
Number distortion.
When concrete application is implemented, A/D converter can use the ADS1271 chip of Texas Instruments, the electricity of application
Road schematic diagram is as shown in Figure 8；When difference amplifier preferably uses Differential OPAMP circuit, two difference of ADS1271 chip
Signal input part can respectively with two Differential output terminals of Differential OPAMP circuit (AINP terminal and AINN in Fig. 7, Fig. 8
Terminal) it is electrically connected.The modulus conversion chip that ADS1271 chip is 24, possesses the bandwidth of 50 kHz, and 105 kSPS's turns
Throw-over rate, the offset drift of 1.8 μ V/ DEG C and the signal-to-noise ratio of up to 109 dB can preferably inhibit modulus signal conversion to lose
Very.
In conclusion the signal acquisition circuit of the utility model digital geophone, is adopted using MEMS shock sensor
The characteristics of collecting bandwidth after arriving required multiple greatly by programmable amplifier side, seismic band is directly filtered out by low-pass filter
Thus noise signal more than detection range may make that amplification factor and seismic band detection range can be according to digital seismics
The detection of wave detector is needed and is set, and reaches the detection frequency bandwidth requirement of needs, is carried out again finally by difference amplifier
Amplify and be converted to digital signal after reducing the fluctuation and drift of signal, avoids biggish signal distortion, promote anti-interference energy
Power；And conditioning processing is subject to by the vibration signal that signal conditioning circuit acquires MEMS shock sensor, it can preferably keep away
The distortion for exempting from vibration signal is more advantageous to the enhanced processing of subsequent programmable amplifier, and it is higher to guarantee that signal acquisition circuit has
Sensitivity；The digitally seismic wave signal acquisition signal obtained in this way has bandwidth, dynamic range big, high sensitivity, abnormal
Become smaller, strong antijamming capability the characteristics of.
Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to embodiment, those skilled in the art should understand that, it can be practical to this
Novel technical solution is modified or replaced equivalently, without departing from the objective and range of technical solutions of the utility model,
It should all cover in the scope of the claims of the utility model.
Claims (7)
1. a kind of signal acquisition circuit of digital geophone, including MEMS shock sensor, which is characterized in that further include letter
Number conditioning circuit, programmable amplifier, low-pass filter, difference amplifier and A/D converter；The shake of the MEMS shock sensor
Dynamic signal output end is electrically connected to the amplified signal input terminal of programmable amplifier by signal conditioning circuit, and programmable amplifier is put
Big signal output end is electrically connected to the amplifier signal input part of difference amplifier, the amplifier of difference amplifier by low-pass filter
Signal output end is electrically connected to the input end of analog signal of A/D converter, and the digital signal output end of A/D converter is as number
Total output end of geophone signal acquisition circuit.
2. the signal acquisition circuit of digital geophone according to claim 1, which is characterized in that the signal condition electricity
Road includes pre-filter circuit, biasing circuit and voltage follower circuit；The vibration signal output end of the MEMS shock sensor
The input terminal of biasing circuit is electrically connected to by pre-filter circuit, the output end of biasing circuit is electrically connected to voltage follower circuit
Input terminal, output end of the output end of voltage follower circuit as signal conditioning circuit.
3. the signal acquisition circuit of digital geophone according to claim 1, which is characterized in that the programmable amplifier
Using LTC6915 chip.
4. the signal acquisition circuit of digital geophone according to claim 1, which is characterized in that the low-pass filter
Using LTC1569-6 chip.
5. the signal acquisition circuit of digital geophone according to claim 1, which is characterized in that the A/D converter
Using ADS1271 chip.
6. the signal acquisition circuit of digital geophone according to claim 1, which is characterized in that the difference amplifier
For Differential OPAMP circuit, amplifier signal input part of the positive input terminal of Differential OPAMP circuit as difference amplifier is complete poor
Divide negative input end and the positive output end ground connection of operational amplifier circuit, fortune of the positive output end of Differential OPAMP circuit as difference amplifier
Discharge signal output end.
7. the signal acquisition circuit of digital geophone according to claim 6, which is characterized in that the Differential OPAMP
Circuit uses OPA1632 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822157949.9U CN209055666U (en) | 2018-12-21 | 2018-12-21 | A kind of signal acquisition circuit of digital geophone |
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| CN201822157949.9U CN209055666U (en) | 2018-12-21 | 2018-12-21 | A kind of signal acquisition circuit of digital geophone |
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| CN209055666U true CN209055666U (en) | 2019-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505351A (en) * | 2020-12-10 | 2021-03-16 | 中船航海科技有限责任公司 | Digital log system adopting open-loop amplifying circuit |
-
2018
- 2018-12-21 CN CN201822157949.9U patent/CN209055666U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505351A (en) * | 2020-12-10 | 2021-03-16 | 中船航海科技有限责任公司 | Digital log system adopting open-loop amplifying circuit |
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Granted publication date: 20190702 Termination date: 20201221 |