CN208705484U - A kind of geophone signal conditioning circuit - Google Patents
A kind of geophone signal conditioning circuit Download PDFInfo
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- CN208705484U CN208705484U CN201820906507.7U CN201820906507U CN208705484U CN 208705484 U CN208705484 U CN 208705484U CN 201820906507 U CN201820906507 U CN 201820906507U CN 208705484 U CN208705484 U CN 208705484U
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- amplifier
- diode
- input port
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- delivery outlet
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Abstract
The utility model provides a kind of geophone signal conditioning circuit, it is related to seismic prospecting signal processing technology field, the signal conditioning circuit includes adjustable gain circuit, which is made of first input end, the second input terminal, the first output end, second output terminal, the first amplifier, the second amplifier, first resistor, second resistance, 3rd resistor, first diode, the second diode, third diode and the 4th diode.Geophone signal conditioning circuit provided by the utility model can automatically adjust the gain values of seismic signal, and especially when the big signal of nearly big gun receives, intelligence reduces gain amplifier, effectively adjust wave detector output sensitivity, achieve the purpose that undistorted transmitting signal.
Description
Technical field
The utility model relates to seismic prospecting signalling technique field more particularly to a kind of geophone signal conditioning circuits.
Background technique
In seismic survey system, wave detector undertakes the task that stratum shock wave is converted to electric signal output, from shake
The seismic wave that source generates is propagated to stratum depths, and the back wave with formation information is transmitted to surface geophone and is connect
By wave detector should receive the seismic wave weak signal transmitted stratum depths, while the seismic wave received near focus also being needed to believe by force
Number, wave detector receives the shock wave information from stratum, is illustrated in fig. 1 shown below.
Since the seismic signal from stratum depths is weaker, wave detector must provide enough sensitivity, can be only achieved
Effect receives the purpose of signal, and enough sensitivity needs geophone signal processing circuit to have enough voltage amplification gains, so
And geophone signal conditioning circuit has fixed gain in the prior art, as detector circuit generallys use the instrument of Differential Input
Amplifier circuit, as shown in Figure 2.
Using the conditioning circuit of fixed gain, signal transmitting distortion, drift are be easy to cause when receiving signal by a relatively large margin
Or amplifying power is lost, that is, proverb " spilling " and " blocking ".As shown in figure 1,1,2,3 ... n of wave detector is arranged in ground, shake
The vibration signal of source Z excitation passes to wave detector by stratum reflection and receives.1,2,3 ... n of wave detector is successively received by strong
Turn weak vibration signal.When the intensity of vibration signal reaches certain amplitude, the output signal of wave detector just will appear distortion, drift
It moves or without output.When especially reception is commonly called as nearly shot point signal apart from the closer shallow-layer signal-of focus, it be easy to cause above-mentioned feelings
Condition, while also greater impact can be generated to subsequent conditioning circuit, cause seismic wave to receive recording exceptional.
Utility model content
In view of the above problems, geophone signal conditioning circuit provided by the utility model can automatically adjust seismic signal
Gain values, especially when the big signal of nearly big gun receives, intelligence reduces gain amplifier, effectively adjusts wave detector output sensitivity,
Achieve the purpose that undistorted transmitting signal, solves nearly big gun over control.
A kind of geophone signal conditioning circuit, which is characterized in that including adjustable gain circuit, the adjustable gain circuit by
First input end, the second input terminal, the first output end, second output terminal, the first amplifier, the second amplifier, first resistor,
Two resistance, 3rd resistor, first diode, the second diode, third diode and the 4th diode composition, in which:
The first input end connects the positive input port of the first amplifier, and the delivery outlet connection first of the first amplifier is defeated
End；Second input terminal connects the positive input port of the second amplifier, and the delivery outlet of the second amplifier connects second output terminal；
The first resistor is connected between the cathode input port of the first amplifier and the cathode input port of the second amplifier；Described second
Resistance is connected between the cathode input port of the first amplifier and delivery outlet；The 3rd resistor is connected to the negative of the second amplifier
Between pole input port and delivery outlet；The cathode of the first diode connects the delivery outlet of the first amplifier, first diode
Anode connects the cathode input port of the first amplifier；The anode of second diode connects the delivery outlet of the first amplifier, the
The cathode of one diode connects the cathode input port of the first amplifier；The cathode of the third diode connects the second amplifier
Delivery outlet, the anode of third diode connect the cathode input port of the second amplifier；The anode connection the of 4th diode
The delivery outlet of two amplifiers, the cathode of the 4th diode connect the cathode input port of the second amplifier.
It further, further include the sensing unit for being connected to adjustable gain circuit input end, the sensing unit is piezoelectricity
Sensing machine core or moving-coil sense machine core and vibration mechanical energy can be converted to electric energy.
Further, the sensing unit is fixedly mounted by core shell and machine core gland, the inside of the core shell
It is provided with pedestal, the machine core gland is fixed the sensing unit on the base by lining ring, the sensing unit packet
The machine core mass body for including one group of piezoelectric chip and being arranged on the piezoelectric chip.
It further, further include the follow-up signal processing circuit for being connected to adjustable gain circuit output end, the subsequent letter
Number processing circuit includes balanced type single-order or multistage high low-pass filter circuit.
Further, the first diode, the second diode, third diode and the 4th diode are 1N4148 type half
Conductor diode.First amplifier and the second amplifier are opa333 type operational amplifier.
A kind of geophone signal conditioning circuit of the utility model has the advantages that
The adjustable gain circuit of the utility model can automatically adjust gain values, when intensity is more than preset amplitude,
Adjustable gain circuit reduces gain and wave detector output is made to be restricted or even not amplify.When intensity is lower than preset amplitude,
Adjustable gain circuit still executes preset gain and weak signal is normally amplified.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the utility model embodiment, embodiment or the prior art will be retouched below
Attached drawing needed in stating is briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is wave detector operation schematic diagram；
Fig. 2 is traditional detector magnifier；
Fig. 3 is the adjustable gain circuit of the utility model；
Fig. 4 is diode current flow characteristic schematic diagram；
Fig. 5 is the schematic diagram that the conducting resistance of the utility model changes with output voltage.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in figure 3, a kind of geophone signal conditioning circuit, including adjustable gain circuit, adjustable gain circuit is by first
Input terminal V1, the second input terminal V2, the first output end V3, second output terminal V4, the first amplifier A1, the second amplifier A2,
One resistance R1, second resistance R2,3rd resistor R3, first diode D1, the second diode D2, third diode D3 and the four or two
Pole pipe D4 composition, in which:
The positive input port of first input end V1 the first amplifier of connection A1, the delivery outlet connection first of the first amplifier A1
Output end V3；The positive input port of second input terminal V2 the second amplifier of connection A2, the delivery outlet connection the of the second amplifier A2
Two output end V4；First resistor R1 is connected to the cathode input port of the first amplifier A1 and the cathode input port of the second amplifier A2
Between；Second resistance R2 is connected between the cathode input port and delivery outlet of the first amplifier A1；3rd resistor R3 is connected to
Between the cathode input port and delivery outlet of two amplifier A2；The cathode of first diode D1 connects the output of the first amplifier A1
Mouthful, the anode of first diode D1 connects the cathode input port of the first amplifier A1；The anode connection first of second diode D2
The delivery outlet of amplifier A1, the cathode of first diode D1 connect the cathode input port of the first amplifier A1；Third diode D3
Cathode connect the delivery outlet of the second amplifier A2, the anode of third diode D3 connects the cathode input of the second amplifier A2
Mouthful；The anode of 4th diode D4 connects the delivery outlet of the second amplifier A2, the second amplification of cathode connection of the 4th diode D4
The cathode input port of device A2.
Specifically, first diode D1, the second diode D2, third diode D3 and the 4th diode D4 are 1N4148
Type semiconductor diode.First amplifier A1 and the second amplifier A2 is opa333 type operational amplifier.
In the present embodiment, the first amplifier A1, the second amplifier A2, first resistor R1, second resistance R2 and 3rd resistor
R3 forms the instrument amplifier front end circuit inputted in the same direction.
Wherein, R2=R3, R1, R2, R3 constitute the voltage negative feedback circuit of amplifier.First diode D1, the two or two pole
The conducting voltage of pipe D2, third diode D3 and the 4th diode D4 are Vd, and input difference voltage V1-V2 is amplified by amplifier
After export V3-V4.
When the amplitude of V3-V4 is lower than 2Vd, first diode D1, the second diode D2, third diode D3 and the four or two
Pole pipe D4 is in off state, since off-resistances are larger, does not constitute influence to second resistance R2 and 3rd resistor R3.
When the amplitude of V3-V4 is more than 2Vd, the second diode D2 and third diode D3 conducting, negative polarity when positive polarity
When first diode D1 and the 4th diode D4 conducting, according to the on state characteristic of diode, as shown in Figure 4, Figure 5, diode
Conducting resistance R can change with the difference of the voltage value at both ends.Therefore, in the present embodiment, the increasing of adjustable gain circuit
Benefit is variate, specific as shown in Figure 5.
Specifically, the gain of adjustable gain circuit is A=2 (R2//R)/R1, wherein R2//R R2 due to R2=R3
Resistance value after in parallel with R, R2//R=(R2*R)/(R2+R).
In actual work, when the amplitude of V3-V4 increases, the conducting resistance R of diode reduces therewith, especially works as V3-
The amplitude of V4 is more than 2Vd, i.e., when the amplitude of V3-V4 is larger, the conducting resistance R of diode is strongly reduced, and the numerical value of R2//R also can
It reduces therewith, gain A is caused to be effectively reduced, realizing intelligence reduces gain amplifier, effectively adjusts wave detector output sensitivity, reaches
To the purpose of undistorted transmitting signal, solves nearly big gun over control.
It further include the sensing unit being connected between adjustable gain circuit input end, sensing unit in specific implementation process
Machine core is sensed for piezoelectric sensing machine core or moving-coil and vibration mechanical energy can be converted to electric energy.
In this implementation, sensing unit is piezoelectric sensing machine core, and sensing unit is fixedly mounted by core shell and machine core gland,
Core shell is internally provided with pedestal, and machine core gland is fixed sensing unit on the base by lining ring, sensing unit
Including one group of piezoelectric chip and the machine core mass body being arranged on piezoelectric chip.
Specifically, above-mentioned machine core mass body is made of copper, aluminium and steel, above-mentioned machine core mass body is cylindrical structure.Circle
Installation annular groove is provided in the middle part of column structure machine core, piezoelectric chip is mounted on the installation annular groove of cylindrical structure machine core.
It further include the follow-up signal processing circuit for being connected to adjustable gain circuit output end in specific implementation process, it is subsequent
Signal processing circuit includes balanced type single-order or multistage high low-pass filter circuit.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (6)
1. a kind of geophone signal conditioning circuit, which is characterized in that including adjustable gain circuit, the adjustable gain circuit is by
One input terminal, the second input terminal, the first output end, second output terminal, the first amplifier, the second amplifier, first resistor, second
Resistance, 3rd resistor, first diode, the second diode, third diode and the 4th diode composition, in which:
The first input end connects the positive input port of the first amplifier, the first output of delivery outlet connection of the first amplifier
End；
Second input terminal connects the positive input port of the second amplifier, the second output of delivery outlet connection of the second amplifier
End；
The first resistor is connected between the cathode input port of the first amplifier and the cathode input port of the second amplifier；
The second resistance is connected between the cathode input port of the first amplifier and delivery outlet；
The 3rd resistor is connected between the cathode input port of the second amplifier and delivery outlet；
The cathode of the first diode connects the delivery outlet of the first amplifier, and the anode of first diode connects the first amplifier
Cathode input port；
The anode of second diode connects the delivery outlet of the first amplifier, and the cathode of first diode connects the first amplifier
Cathode input port；
The cathode of the third diode connects the delivery outlet of the second amplifier, and the anode of third diode connects the second amplifier
Cathode input port；
The anode of 4th diode connects the delivery outlet of the second amplifier, and the cathode of the 4th diode connects the second amplifier
Cathode input port.
2. geophone signal conditioning circuit according to claim 1, which is characterized in that further include being connected to adjustable gain electricity
The sensing unit of road input terminal, the sensing unit is piezoelectric sensing machine core or moving-coil senses machine core and can will shake mechanical
Electric energy can be converted to.
3. geophone signal conditioning circuit according to claim 2, which is characterized in that the sensing unit is by core shell
It is fixedly mounted with machine core gland, the core shell is internally provided with pedestal, and the machine core gland passes through lining ring for the biography
It is fixed on the base to feel unit, the sensing unit includes one group of piezoelectric chip and is arranged on the piezoelectric chip
Machine core mass body.
4. geophone signal conditioning circuit according to claim 1, which is characterized in that further include being connected to adjustable gain electricity
The follow-up signal processing circuit of road output end, the follow-up signal processing circuit include balanced type single-order or multistage high low-pass filtering
Circuit.
5. geophone signal conditioning circuit according to any one of claims 1 to 4, which is characterized in that the described 1st
Pole pipe, the second diode, third diode and the 4th diode are 1N4148 type semiconductor diode.
6. geophone signal conditioning circuit according to claim 5, which is characterized in that first amplifier and second is put
Big device is opa333 type operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820906507.7U CN208705484U (en) | 2018-06-12 | 2018-06-12 | A kind of geophone signal conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820906507.7U CN208705484U (en) | 2018-06-12 | 2018-06-12 | A kind of geophone signal conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208705484U true CN208705484U (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820906507.7U Expired - Fee Related CN208705484U (en) | 2018-06-12 | 2018-06-12 | A kind of geophone signal conditioning circuit |
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| Country | Link |
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| CN (1) | CN208705484U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001796A (en) * | 2018-06-12 | 2018-12-14 | 西安陆海地球物理科技有限公司 | A kind of geophone signal conditioning circuit |
-
2018
- 2018-06-12 CN CN201820906507.7U patent/CN208705484U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001796A (en) * | 2018-06-12 | 2018-12-14 | 西安陆海地球物理科技有限公司 | A kind of geophone signal conditioning circuit |
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Granted publication date: 20190405 |