SU1288642A1 - Device for converting seismic signal - Google Patents

Abstract

The invention relates to information-measuring technology and can be used in seismology and seismic exploration, especially in equipment using sign-based coded seismic signals. The purpose of the invention is to increase the sensitivity and noise immunity of transmitted signals. It is achieved by using amplified and formed in the shaper 8 U-shaped alternating alternating signals, obtained by using highly non-linear signals, taken from two oppositely connected inductance coils 6 and 7. Coils 6 and 7 are located in the gaps of like-oriented fixed permanent magnets 2 and 3 and of the moving magnet 5 - an inert mass. Enhancing and improving the accuracy of the signal transfer through zero is achieved by a sharp nonlinearity of the dependence of the magnetic flux in the gaps on the displacement of the inert mass. 1 hp f-ly, 4 ill. S (L 5N5 00 00 O5 4: tc

Description

The invention relates to information-measuring technology and can be used in seismology and seismic exploration, for example, in equipment using sign coding of received seismic signals.

The purpose of the invention is to increase the sensitivity and noise immunity of transmitted signals.

Fig. 1 is a schematic diagram of the proposed device for converting seismic signals in Fig. 2 — a magnetic field between like poles with a maximum distance between them; Fig. 3 is the same, with a minimum distance between them; Fig. 4 shows the voltage plots at the terminals of the inductors and at the output of the device.

The device contains a magnetic body 1 ,. permanent magnets 2 and 3 bonded to it and diamagnetic sleeve 4, inside of which a permanent magnet in a suspended state located coaxially with magnets 2 and 3 and directed towards them with the same poles, is in a suspended state. Inductance coil 6 is located between like poles of magnets 2 and 5 and coil 7 is located between like poles of magnets 3 and 5, Coils 6 and 7 of inductance are connected to the inputs of the former 8 of the output seismic signal.

The output driver 8 of the seismic signal contains operational amplifiers 9 and 10 and resistors 11-13.

The device works as follows.

The arrival of a seismic wave causes the body 1 to move (for example, from bottom to top), herewith due to the inertia of the mastshta 5 ,. having a large mass, the upper gap between the poles N of the magnets 2 and 5 increases and the lower gap between the poles S of the magnets 5 and 3 decreases. As can be seen from FIGS. 2 and 3, the inductance coil 7 is strongly affected by magnetic flux. an increase in the number of magnetic field lines penetrating the coil and due to their deformation, i.e. condensation due to the large heterogeneity of the field between the like

poles. In this case, an EMF is induced in the winding of the coil 7, having a significant amplitude and slope of changing the sign from + to - (FIG. 4, diagram Eg).

Due to the large inhomogeneity of the magnetic flux, which penetrates the coil between the poles of the same name, the emf is of a non-sinusoidal form. At the same time, in the coil 6, located between the diverging poles of the magnets 2 and 7, an emf of opposite sign is induced (Fig. 4, diagram E). Since the process is oscillatory, then the poles of N magnets 3 and 5 will converge J and the poles S of magnets 2 and 5 diverge and t, e. Since coils 6 and 7 are turned on in opposite to each other, a total emf is applied to the input of the driver 8, which is characterized by a large steepness

signs from + to -, and from - to + (FIG. 4, diagram, .E).

The driver 8 is first amplified by an amplifier built on an operational amplifier 9 and resistors 11 and 12, and then fed to a comparator consisting of an operational amplifier 10 and a resistor 13. In the comparator, the amplified input voltage U j is compared with a zero value: at the input voltage Uf, 0 we get U yi + Un T T, with, we get% UPI and with Uj O we get ,, 0.

Thus, at the output of the device, we obtain a sign-encoded seismic signal, which fully preserves all the time and phase relationships of the received signal and has an amplitude approximately equal to the voltage of the power source.

0

five

The use of the device in complexes with non-explosive sources and equipment with sign coding of seismic signals allows to increase the sensitivity and noise immunity of the equipment, the reliability of the information obtained, and thus makes it possible to increase the detail and depth of research. In addition, the advantage of the proposed device is the simplicity of its design, the absence of springs and flexible contacts, which significantly

increases the reliability of the device and reduces the cost of its manufacture.

Claims (2)

1. A seismic signal conversion device containing a magnetically conductive body, an inert mass in the form of a permanent magnet placed in a diamagnetic sleeve and suspended on a magnetic suspension j made in the form of upper and lower axially arranged permanent magnets mounted in the body and inductors, which is due to the fact that, in order to increase the sensitivity and noise immunity of the device, it is equipped with an additional inductance coil and output driver, and the upper axially located permanent magnet is oriented by the same pole to the inertial mass, the inductors are located 12886424 between the poles of the magnets of the same name and are connected side by side, and the beginning of the windings of the coils are connected to the inputs of the shaper of the output seismic signal. 2. The device as claimed in claim 1, wherein the driver of the output seismic signal contains two operational amplifiers and three resistors, the first input of the driver being connected to the first output of the device through a series circuit. from the first resistor, the first operational amplifier, the second resistor and the second operational amplifier, the second input of the driver is connected to the second output of the device and the non-inverting inputs of the second k of the first operational amplifiers, and the output and inverting The last input of the latter is connected via the third resistor.