CN210442515U - Active moving-coil detector - Google Patents
Active moving-coil detector Download PDFInfo
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- CN210442515U CN210442515U CN201920842249.5U CN201920842249U CN210442515U CN 210442515 U CN210442515 U CN 210442515U CN 201920842249 U CN201920842249 U CN 201920842249U CN 210442515 U CN210442515 U CN 210442515U
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Abstract
The utility model belongs to the technical field of seismic exploration, especially, relate to an active moving coil detector. The utility model discloses a technical scheme of shell, caudal vertebra, core unit and circuit adopts the full-balance fully differential circuit, and differential input differential output's mode provides a neotype active moving coil wave detector, effectively improves wave detector output sensitivity, improves whole common mode rejection ratio, greatly improves anti electromagnetic interference ability.
Description
Technical Field
The utility model belongs to the technical field of seismic exploration, especially, relate to an active moving coil detector.
Background
In a seismic exploration system, a geophone is used for converting received stratum reflection vibration waves into electric signals to be output, seismic waves generated by a seismic source are transmitted to the deep part of a stratum, reflected waves with stratum information are transmitted to a ground geophone to be received, and due to the limitation of the intensity of the seismic source and the attenuation of a stratum medium, the geophone needs to receive weak seismic wave signals transmitted from the deep part of the stratum. In order to fully and accurately reflect formation information, the detector must have sufficient sensitivity and sufficient receiving bandwidth, and have the capability of resisting external interference.
A moving-coil detector, also called an electrodynamic or magnetoelectric detector, is a kind of electromechanical sensor responding to vibration speed based on the electromagnetic induction principle and is widely used in land seismic exploration. The conventional geophone is used for seismic exploration in the past 50 s, namely the conventional geophone has the advantages of being passive (power supply is not needed), simple in manufacturing process, low in manufacturing cost and the like, but has the defects of low sensitivity, narrow frequency band range, poor anti-interference capability and the like, particularly the defect of low sensitivity, the requirement of the existing stage on high precision of exploration is limited, and the sensitivity is increased through combination, but the cost of a waterwheel is increased, and other negative effects are brought by the combination.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can effectively improve detector output sensitivity, can provide sufficient common mode rejection ratio again, effectively resist external electromagnetic field interference, greatly improve the SNR of seismic acquisition data record to improve the quality of gathering the data, and with follow-up collection station circuit assorted active moving coil detector based on the electromagnetic induction principle.
In order to achieve the above object, the utility model adopts the following technical scheme:
an active moving-coil detector at least comprises a shell, a tail cone and a
A movement unit, a control unit and a control unit,
and the positive end of the core unit is connected with the input positive end of the circuit, and the negative end of the core unit is connected with the input negative end of the circuit.
The movement unit at least comprises a first movement; the positive end of the first movement is connected with the input positive end of the circuit, and the negative end of the first movement is connected with the input negative end of the circuit.
The movement unit also comprises a second movement; the positive end of the second movement is connected with the negative end of the first movement and grounded, the positive end of the first movement is connected with the input positive end of the circuit, and the negative end of the second movement is connected with the input negative end of the circuit.
The first core and the second core are two same moving coil detector cores.
The circuit consists of a preamplifier and a filter circuit, wherein the positive end of the preamplifier is connected with the positive input end of the filter circuit, and the negative end of the preamplifier is connected with the negative input end of the filter circuit.
The circuit adopts a fully balanced fully differential circuit and differential input and differential output.
Has the advantages that: the utility model discloses a technical scheme of shell, caudal vertebra, core unit and circuit adopts the full-balance fully differential circuit, and the mode of differential input differential output provides a neotype active moving coil wave detector, effectively improves wave detector output sensitivity, improves whole common mode rejection ratio, greatly improves anti electromagnetic interference ability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a first schematic view of the present invention;
FIG. 2 is a schematic view of the present invention;
fig. 3 is a first schematic circuit diagram of the present invention;
fig. 4 is a second schematic circuit diagram of the present invention;
fig. 5 is a first schematic circuit diagram of the present invention;
fig. 6 is a schematic diagram of the circuit principle of the present invention.
In the figure, 1-housing; 2-caudal vertebra; 3-a first movement; 4-a second movement; 5-a circuit; 6-a preamplifier; 7-a filter circuit; 8-acquisition station circuitry; 9-a movement unit; 10-signal output; a1 — first operational amplifier; a2 — second operational amplifier; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; c1 — first capacitance; c2-second capacitance.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
an active moving-coil pickup as shown in fig. 1-6 comprises at least a housing 1 and a tail cone 2, and further comprises
The movement unit 9 is provided with a movement unit,
and in the circuit 5, the positive end of the movement unit 9 is connected with the input positive end of the circuit 5, and the negative end of the movement unit 9 is connected with the input negative end of the circuit 5.
Preferably, the circuit 5 is composed of a preamplifier 6 and a filter circuit 7, wherein the positive terminal of the preamplifier 6 is connected with the positive input terminal of the filter circuit 7, and the negative terminal of the preamplifier 6 is connected with the negative input terminal of the filter circuit 7.
In practical use, the active moving coil detector consists of a core unit, a circuit, a caudal vertebra and a shell, wherein a vibration starting unit of the active moving coil detector is the core unit, and the active moving coil detector realizes electromechanical conversion of converting a vibration signal into an electric signal and is a heart component of the detector. The detector outputs the signal to a subsequent acquisition station.
The positive end of the movement unit 9 is connected with the input positive end of the circuit 5, and the negative end of the movement unit 9 is connected with the input negative end of the circuit 5, so that the full-balance differential output of the movement is realized. The circuit adopts a fully balanced fully differential circuit and differential input and differential output.
The utility model discloses a technical scheme of shell, caudal vertebra, core unit and circuit adopts the full-balance fully differential circuit, and the mode of differential input differential output provides a neotype active moving coil wave detector, effectively improves wave detector output sensitivity, improves whole common mode rejection ratio, greatly improves anti electromagnetic interference ability.
Example two:
an active moving-coil detector as shown in fig. 2, 4 and 6 is different from the first embodiment in that: the movement unit 9 at least comprises a first movement 3; the positive end of the first machine core 3 is connected with the input positive end of the circuit 5, and the negative end of the first machine core 3 is connected with the input negative end of the circuit 5.
Preferably, the circuit 5 adopts a fully balanced fully differential circuit, and differential input and differential output are adopted.
In practical use, fig. 2 is a simple way of connecting the movement and the circuit, which is designed to simplify the structure and facilitate the manufacture, on the premise that the common mode rejection ratio of the detector is not very high. The connection of fig. 4 and 6 is correspondingly formed.
The circuit 5 mainly comprises a preamplifier and a filter circuit, wherein the positive end of the preamplifier is connected with the positive input end of the filter circuit, and the negative end of the preamplifier is connected with the negative input end of the filter circuit.
Example three:
an active moving-coil detector as shown in fig. 2, 4 and 6 is different from the first embodiment in that: the movement unit 9 further comprises a second movement 4; the positive end of the second movement 4 is connected with the negative end of the first movement 3 and grounded, the positive end of the first movement 3 is connected with the input positive end of the circuit 5, and the negative end of the second movement 4 is connected with the input negative end of the circuit 5.
Preferably, the first movement 3 and the second movement 4 are two identical moving coil pickup movements.
In practical use, the same two first movement 3 and second movement 4 are connected in series and grounded in a positive-negative connection mode (series-mode combination), as shown in fig. 1, the negative end of the movement 1 is connected with the positive end of the movement 2 and grounded, the positive end of the movement 1 is connected with the input positive end of the circuit, and the negative end of the movement 2 is connected with the input negative end of the circuit, so that the full balance differential output of the movement is realized. The circuit adopts a fully balanced fully differential circuit and differential input and differential output. The detector outputs to a subsequent acquisition station. The first machine core 3 and the second machine core 4 can be traditional moving coil detector machine cores and are composed of permanent magnets, coils and spring pieces, the magnets have strong magnetism, the coils are formed by winding copper enameled wires on a frame, and two output ends of the coils output positive and negative signals.
The schematic diagram of the circuit part is shown in fig. 3.
The operational amplifiers A1 and A2 and the resistors R1, R2, R3, R4 and R5 form a fully differential preamplifier circuit. The capacitors C1 and C2 and the resistor R6 form a high-pass filter circuit. R1 and R2 form an input resistance circuit of the preamplifier, R3, R4 and R5 form a voltage negative feedback loop of the preamplifier, R1 ═ R2, R3 ═ R4, C1 ═ C2, and a1 and a2 are the same operational amplifiers, and the output from the movement to the whole circuit shows a differential full balance characteristic.
The first movement 3 and the second movement 4 are respectively output to the non-inverting input ends of A1 and A2 after being connected in series, and R1 and R2 are connected in series and grounded and connected to the non-inverting input ends of an operational amplifier A1 and an operational amplifier A2; the inverting input end of A1 is connected with one end of a resistor R3, and the other end of R3 is connected with the output end of A1; the inverting input end of the A2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the output end of the A2; the inverting input end of A1 is connected with the inverting input end of A2 through a resistor R5; the high-pass filter circuit consists of a capacitor C1, a capacitor C2 and a resistor R6; one end of the C1 is connected to the output end of the operational amplifier A1, one end of the C2 is connected to the output end of the operational amplifier A2, and the other ends of the C1 and the C2 are connected with the resistor R6.
The preamplifier realizes the functions of signal amplification and impedance transformation. Amplifier gain A:
A＝1+2R3/R5＝1+2R4/R5
by adjusting the resistance values of R3, R4 and R5, the gain required by the sensitivity of the whole machine can be realized.
And an input impedance circuit consisting of R1 and R2 meets the load required by the output of the movement.
And the high-pass filter circuit consists of C1, C2 and R6 and is used for filtering zero drift.
Due to the gain adjusting function of the preamplifier, the sensitivity requirement required by the whole detector can be conveniently realized, and the defect of low sensitivity of the traditional moving coil detector is overcome. Meanwhile, the full-differential full-balance characteristic of the whole detector greatly improves the overall common-mode rejection ratio and enhances the capability of the detector for inhibiting external interference.
The utility model provides a pair of active moving coil detector effectively improves detector output sensitivity, improves whole common mode rejection ratio, greatly improves anti electromagnetic interference ability.
In practical use, the first machine core 3 and the second machine core 4 adopt two identical moving coil detector machine cores, and the consistency of the first machine core 3 and the second machine core 4 ensures that the balance of circuit parts is very consistent, so that the signal-to-noise ratio is large enough, and the capability of resisting external interference is effectively improved.
To sum up, the utility model discloses a core unit and the technical scheme of a circuit composition active moving coil wave detector that contain a core at least adopt the full-balance fully differential circuit, and the mode of differential input difference output provides a neotype active moving coil wave detector, effectively improves wave detector output sensitivity, improves whole common mode rejection ratio, greatly improves anti electromagnetic interference ability.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Technical solutions between various embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Claims (6)
1. An active moving-coil detector at least comprises a shell (1) and a caudal vertebra (2), and is characterized in that: also comprises
A movement unit (9),
and the positive end of the core unit (9) is connected with the input positive end of the circuit (5), and the negative end of the core unit (9) is connected with the input negative end of the circuit (5).
2. An active moving coil detector as claimed in claim 1, wherein: the movement unit (9) at least comprises a first movement (3); the positive end of the first movement (3) is connected with the input positive end of the circuit (5), and the negative end of the first movement (3) is connected with the input negative end of the circuit (5).
3. An active moving coil detector as claimed in claim 2, wherein: the movement unit (9) also comprises a second movement (4); the positive end of the second movement (4) is connected with the negative end of the first movement (3) and grounded, the positive end of the first movement (3) is connected with the input positive end of the circuit (5), and the negative end of the second movement (4) is connected with the input negative end of the circuit (5).
4. An active moving coil detector as claimed in claim 3, wherein: the first core (3) and the second core (4) are two same moving coil detector cores.
5. An active moving coil detector as claimed in claim 1, wherein: the circuit (5) is composed of a preamplifier (6) and a filter circuit (7), the positive end of the preamplifier (6) is connected with the positive input end of the filter circuit (7), and the negative end of the preamplifier (6) is connected with the input negative end of the filter circuit (7).
6. An active moving coil detector as claimed in claim 1 or 5, wherein: the circuit (5) adopts a fully balanced fully differential circuit and differential input and differential output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842249.5U CN210442515U (en) | 2019-06-05 | 2019-06-05 | Active moving-coil detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842249.5U CN210442515U (en) | 2019-06-05 | 2019-06-05 | Active moving-coil detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210442515U true CN210442515U (en) | 2020-05-01 |
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ID=70402826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920842249.5U Expired - Fee Related CN210442515U (en) | 2019-06-05 | 2019-06-05 | Active moving-coil detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210442515U (en) |
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2019
- 2019-06-05 CN CN201920842249.5U patent/CN210442515U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200501 |
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| CF01 | Termination of patent right due to non-payment of annual fee |