SU1679440A1 - Resonance geaphone - Google Patents

Abstract

The invention relates to geophysical instruments and can be used in seismology and seismic exploration. The purpose of the invention is to increase the information content by expanding the frequency range during remote adjustment. The resonant seismic receiver comprises a housing 1, on the basis of which an elastic plate element 3 is located, on which a fixed inertial mass 4 with an electric motor 6 and a guide 7 is fixed. The movable part of the inertial mass is adapted to move along a screw 9 fixed on the motor shaft, guide and elastic element. A piezo element is reinforced on an elastic element. The screw of the electric motor is equipped with a bearing support 10, which is fastened to the end of the guide rail. Calibration is provided by a coil-magnet assembly of 11.1 Cp f-ly, Zil.

Description

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The invention relates to geophysical instruments and can be used in seismology and seismic surveys for recording seismic arrivals, studying seismic noise and receiving vibrosignals.

The purpose of the invention is to increase the information content by expanding the frequency range during remote adjustment.

1 shows a geophone} a general view; figure 2 is the same, top view; on fig.Z - section A - A in figure 2.

Resonant seismic receiver contains (figure 1) case 1 with base 2, elastic plate element 3, on the end of which there is fixed part of inertial mass. 4. The movement of the moving mass 5 is carried out by an electric motor 6, which stands on the guide 7. The mobile mass 5 is connected to a nut 8, through which a screw 9 rotating from an electric motor 6 passes with a bearing support 10. Calibration is provided with a coil unit - magnet 11, there is a block The control unit 12, which commands the motor 6 and the calibration pulses to the coil — the magnet 11. The pins 13 (FIG. 2) connecting the nut 8 and the moving mass 5 are passed through the guide grooves 14 of the guide 7, piezo transducer 15 (FIG. H) attached to an elastic plate e Item 3 at rack 16 (FIG. 1).

The seismic receiver works as follows.

The seismic receiver is installed at the registration point. The control unit 12 is connected to the power and control panel lines. After calibration by applying a voltage pulse to the coil-magnet 11 calibration unit, they proceed to solving research problems. The pulses described by the d-function or the signal from the white noise generator are used for calibration. The output signal of the seismic receiver due to the high quality factor of the resonant system will have a quasi-sinusoidal form. To register seismic noise in a wide frequency range, continuously or discretely, through the control unit 12, the electric motor 6 is supplied with voltage, the subsequent rotation of the screw 9 is accompanied through the nut 8 and the pins 13 by moving the moving mass 5 along the guide grooves 14 within the base: bearing-bearing 10 - electric motor 6. Thus, due to a change in the moment of inertia, within certain limits, they vary with the own resonant frequency of the mechanical system consisting of a fixed part

an inertial mass 4, a coil-magnet 11, a guide 7 with a bearing support 10, an electric motor 6 and a screw 9; the weight of the nut 8, the pins 13, the moving mass 5 and the elastic plate element 3 with a transducer 15. The seismic vibrations, the passage through the housing 1 and the base 2, cause oscillations of the mechanical system, which due to the mechanical resonator Q times (Q - mechanical

5, the system quality factor) enhances the part of the noise spectrum that coincides with the frequency of mechanical resonance. By moving the moving mass 5 and analyzing the signal of the piezoelectric transducer 15, the

0 spectrum of seismic noise. With vibroseis reconnaissance in accordance with the change in the frequency of the sweep signal sent, with the required time delay determined for the boundary under study, the moving mass 5 moves with the corresponding speed and the reflected signal is judged by the received signal. The calibration is carried out, in this case, in advance, the program of operation of the electric motor 6 is determined. The possibility of remotely changing the resonant frequency of the device increases the efficiency of operation.

Claims (2)

1. Resonance seismic receiver containing 5 case, at the base of which is fixed an elastic plate element with a fixed inertial mass relative to it and a piezoelectric transducer placed on an elastic 0 element, characterized in that, in order to increase the information content by expanding the frequency range for remote adjustment, the fixed inertial mass is made with a steering and an electric motor, at the end of the shaft of which a screw is installed and a movable inertial mass is inserted, made of placed on the screw, the guide and the elongated element, which are parallel to each other. 2. The seismic receiver according to claim 1, of which is with the fact that, in order to increase the sensitivity, the motor screw 5 is provided with a bearing bearing fixed on the end of the guide. 7 10 14 -d, P, 8