SU1318952A1 - Device for registering vibroseismic signals - Google Patents

Abstract

The invention relates to vibration seismic prospecting and can be used to select frequency modulated signals. The purpose of the invention is to increase the information content and reduce distortion when registering signals by matching the tuning frequency with the initial frequency of the vibration signal. The invention makes it possible to eliminate signal distortions associated with transients in setting up the following filters included in the recording paths of the seismic and vibration signals of the seismic station. The transition process from the initial tuning mode to the vibration signal tracking mode is eliminated by the introduction of a signal generator of the initial tuning frequency, a vibration signal identification unit, a switch and a switch. 1 il. ABOUT)

Description

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The invention relates to vibration seismic prospecting and can be used to select frequency-modulated signals.

The purpose of the invention is to increase the information content and reduce distortion when registering signals by matching the tuning frequency with the initial frequency of the vibration signal.

The drawing shows a block diagram of a device for recording vibration seismic signals.

The device for recording vibration seismic signals contains a vibration signal sensor 1, a vibration signal shaper 2, a vibration signal identification unit 3, a seismic signal receiver 4, an amplifier 5, a trace 1, a seismic signal filter 6, a source frequency signal generator 7, a switch 8, a sped filter 9 of the vibration signal, the amplitude recovery unit. 10, the switch 11 and the recorder 12. The output of the vibration signal sensor 1 is connected to the input of the vibration signal generator 2. The receiver 4 is seismic The signal through the amplifier 5 and the next filter 6 of the seismic signal is connected to the first input of the recorder 12. The initial frequency signal generator 7 is connected to the first information input of the switch 8, the output of which is connected to the information input of the vibration filter 9 and the control inputs of the filter 6 and 9. seismic and vibration signals, respectively. The output of the vibration signal generator 2 is connected to the vibration signal recognition unit 3 and the second information input of the switch 8. The output of the vibration signal identification unit 3 is connected to the control input of the switch 8 and to the control input of the vibration signal switch 9 through the vibration signal 9 through block 10 amplitude recovery and the switch 11 is connected to the second input of the recorder 12.

As the vibration signal sensor and the seismic signal receiver, both accelerometers and vibration displacement velocity sensors can be used.

The shaper of a vibration signal can be an amplifier or

2

null-body depending on the requirements for the control signal from the side of the following filters.

Vibration recognition unit

The signal can be made on the basis of series-connected rectifiers, smoothing the low-pass filter and the threshold element.

As an amplifier can be

a seismic amplifier was used, provided that its output parameters were matched with the input parameters of the next seismic filter

signal.

I

To eliminate the transition process in tuning the filters, the equality of the initial and initial tuning frequencies must be ensured accurately. Therefore, the initial frequency signal generator must be built on the basis of highly stable frequency setting circuits. The resolution of the installation of the initial frequency of the generator must correspond to the discreteness of the installation of the initial frequency of vibration.

The switch and switch can be made on the basis of a MDS key with controllable logic at the input,

The following filters are made on the basis of frequency-dependent four-port networks with controlled characteristics, covered by an automatic frequency control circuit. The seismic and vibration signal filters must have the same transfer functions at all tuning frequencies, thus compensating for the effect of spurious phase modulation of the output

signals during transients and in tracking mode.

The amplitude recovery unit may be an automatic gain control circuit, a scale amplifier, or an attenuator, depending on the characteristics of the tracking filter of the vibration signal. In the particular case when the filter does not make changes in the amplitude of the signal,

block may be missing.

The recorder should be multichannel with the possibility of multiple reproduction of recorded signals with preservation of their amplitude and phase relations. Registration can be done in both analog and digital form. Seismic recorders can be used313

recordings on tape, disk, solid memory, etc.

The device works as follows.

In the initial state, when the device is turned on, but the vibration is not performed, there are no signals at the inputs and outputs of the vibration sensor 1 connected in series to the shaper 2 and the identification unit 3. Switch 8 is in such a state that the control inputs of the following filters

6 and 9 are connected to the generator output

7 signal of the original frequency, the frequency of which is set equal to the initial frequency of vibration. Consequently, the following filters 6 and 9 are tuned to the initial vibration frequency. .

A seismic signal is sequentially passed through the receiver 4 of the seismic signal, amplifier 5 and the next filter 6 of the seismic signal is fed to the input of the recorder 12, Cig

The signal produced by the generator of the initial frequency signal 7, the passage through the next filter of the vibration signal 9 and the amplitude recovery unit 10, does not reach the recorder 12, since the switch 1 is opened by the control signal from the vibration signal recognition unit 3. Thus, the signal of the original frequency, not getting into the recorder 12, does not create interference, and the following filters 6 and 9 are fully prepared for the tracking mode.

At the time of the start of vibration, the signal from the vibration signal sensor 1 is fed to the vibration signal shaper 2 and then to the inputs of the switch 8 and the vibration signal recognition unit 3. Block 3 of the identification. a vibration signal, a signal that transfers the switch 8 to a state in which the output of the initial frequency signal generator 7 is turned off, and the output of the vibration signal generator 2 is connected to the control inputs of the following filters 6 and 9, and the vibration signal from this moment begins manage them. From the output of the vibration signal recognition unit 3, the input of the switch 11 receives a signal that connects the second input of the recorder 12 to the output of the recovery unit 10 O

-50

five

five

0

d

5 0 5

amplitudes that restore the original amplitude of the vibration signal, in general distorted by the following filter 9.

Since there is no frequency jump when triggering switch 8, there is no transition process associated with capturing the new control signal and rebuilding the tracking filter control system

6 and 9 seismic and vibration signals on the new mode. Therefore, there are no information losses typical for the transition process of tuning.

The tracking of the frequency of the vibration signal occurs until the end of the excitation cycle and the disappearance of the vibration signal at the output of the vibration signal sensor 1. At this moment, the vibration signal identification unit 3 generates a control signal, along which the switch 11 interrupts the vibration signal supply circuit to the recorder input 1 2 and connects the generator output

7 signals the original frequency to the control inputs of the following filters 9 and 6 vibration and seismic signals. The device thus returns to its original state and is ready to receive the next excitation cycle.

.one

When changing the value of the initial frequency of the vibration signal, the frequency of the generator 7 of the signal of the initial frequency should also be changed.

Claims (1)

Invention Formula A device for recording vibration seismic signals, comprising a vibration signal sensor, the output of which is connected to the input of a vibration signal generator, a tracking filter of the vibration signal, an amplitude recovery unit, a recorder and a serially connected seismic signal receiver, an amplifier and a next seismic signal filter, with a trace output the vibration filter is connected to the input of the amplitude recovery unit, and the output of the next filter of the seismic signal is connected to the first input p recorder of, characterized in that in order to increase the information content and umenshe5131 No distortions when registering signals by matching the tuning frequency with the n: initial frequency of the vibration signal, a vibration signal identification block, a source frequency signal generator, a switch and a switch are entered into it, and the output frequency signal generator output is connected to the first information input of the switch, output the vibration signal generator is connected to the input of the vibration signal recognition unit and to the second 89526 the formation input of a switch, the output of which is connected to the information input of the following vibration signal filter and to the control 5 inputs of the following filters of the vibration and seismic signals, the output of the vibration signal identification unit is connected to the control inputs of the switch and switch, the intO formational input of which is connected to the output of the amplitude recovery unit, and the output to the second input of the recorder. Editor V.Danko Compiled by A. Aleshin Tehred M. Khodanych Order 2506/39 Circulation 730 Subscription BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul, Proektna, 4 Proofreader I. Muska