Active moving-coil geophone
A geophone and source technology, used in instruments, scientific instruments, seismic signal receivers, etc., can solve the problems of low sensitivity, restricting the high-precision requirements of exploration, and poor anti-interference ability, and improve output sensitivity and anti-electromagnetic. Interference ability, the effect of improving the common mode rejection ratio
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Embodiment 1
[0025] Such as Figure 1-Figure 6 An active moving coil geophone shown at least includes a shell 1 and a tail cone 2, and also includes
[0026] core unit 9,
[0027] In the circuit 5, the positive terminal of the core unit 9 is connected to the positive input terminal of the circuit 5, and the negative terminal of the core unit 9 is connected to the negative input terminal of the circuit 5.
[0028] Preferably described circuit 5 is made up of two parts of preamplifier 6 and filter circuit 7, and the positive end of preamplifier 6 is connected with the positive input end of filter circuit 7, and the negative end of preamplifier 6 is connected with the positive input end of filter circuit 7. Input negative connection.
[0029] In actual use, the active dynamic geophone is composed of a core unit, a circuit, a tail cone and a shell. The vibration starting unit of the active dynamic geophone is the core unit, which realizes the electromechanical conversion of the vibration sig...
Embodiment 2
[0033] Such as figure 2 , Figure 4 and Figure 6 The difference between the shown active moving coil detector and the first embodiment is that the core unit 9 includes at least the first core 3; the positive terminal of the first core 3 is connected to the circuit The input positive terminal of 5, the negative terminal of the first movement 3 is connected to the input negative terminal of circuit 5.
[0034] Preferably, the circuit 5 adopts a fully balanced fully differential circuit with differential input and differential output.
[0035] In actual use, figure 2 It is a simple way to connect the core and the circuit designed to simplify the structure and facilitate manufacturing under the premise that the common mode rejection ratio of the detector is not very high. correspond to form Figure 4 and Figure 6 connection method.
[0036] The circuit 5 is mainly composed of a preamplifier and a filter circuit. The positive terminal of the preamplifier is connected to ...
Embodiment 3
[0038] Such as figure 2 , Figure 4 and Figure 6 A kind of active moving coil detector shown is different from Embodiment 1 in that: the core unit 9 also includes a second core 4; the positive end of the second core 4 is connected to the first core The negative terminals of 3 are connected and grounded, the positive terminal of the first movement 3 is connected to the positive input terminal of the circuit 5, and the negative terminal of the second movement 4 is connected to the negative input terminal of the circuit 5.
[0039] Preferably, the first movement 3 and the second movement 4 are two identical moving coil detector movements.
[0040] In actual use, the same two first cores 3 and second cores 4 are positively and negatively connected in series and grounded (serial model combination), such as figure 1 As shown, the negative terminal of core 1 is connected to the positive terminal of core 2 and grounded, the positive terminal of core 1 is connected to the positive...
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