SU1712928A1 - Device for determining coil position in dynamic geophone - Google Patents

Abstract

The invention relates to geophysical instrumentation and is intended for use in means of control in the manufacture and operation of electrodynamic seismic receivers. The purpose of the invention is to improve accuracy. By introducing a second current generator and an analog switch, the coil can be tilted in both directions from the equilibrium position, and the introduction of two memory registers and a digital adder automates the process of calculating the relative position of the electrodynamic seismic receiver coil. 1 hp ff, 2 ill.

Description

The present invention relates to geophysical instrument making and is intended for use both in the means of technological control of the assembly process of seismic receivers at instrument-making enterprises, and g geophysical expeditions in the performance monitoring of electrodynamic seismic receivers (EDSP).

The proposed technical solution allows for the selection of EDSP. working at amplitudes of controlled vibrations, comparable with the values of possible displacements of the coil, due to the design of EDSP, and also to control the relaxation in time of the elastic elements of the coil suspension.

A device is known that provides visual control of the coil position in EDSP. The disadvantage is the need for an open EDSP design.

It is also known a device in which the movement of the coil and EDSP coil is monitored according to the results of the integration of the output signal after the end of the exciting current pulse. A device implementing this solution contains a current generator, a key integrator, a measuring unit, a control and computing unit. The disadvantage of this solution is the low accuracy of determining the position of the coil in EDSP, since the measurement is carried out when the coil deviates only in one direction.

The aim of the invention is to increase, the accuracy of the determination of the relative position of the coil in EDSP.

The goal is achieved in that a device containing a current generator, an analog key, an analog-digital integrator, a control unit and a computing unit, the output of the current generator connected via an analog key to a seismic receiver input connected to the analog-digital integrator input, with the control inputs of an analog key, an analog-digital integrator and a computing unit, a second current generator and an analog key, two memory registers and a digital adder, with the output of the second ge The current ramp through the second analog switch is connected to the input of the geophone, and the information outputs of the analog-digital integrator are connected to the information inputs of memory registers, the outputs of which are connected to the inputs of the digital adder, the outputs of which and the outputs of one of the memory registers In this way, the outputs of the control unit are connected to the control inputs of the second analog key and memory registers, and to simplify the control unit contains a pulse generator connected to the input of the counter ik, the outputs of which are connected via signal conditioners to the corresponding outputs of the control unit.

The new nodes introduced into the device: the second current generator and the second analog switch, allow the EDB coil to be deflected to both sides from the equilibrium position; memory registers and a digital adder allow the calculation of the relative position of the coil in EDSP.

Figure 1 presents the block diagram of the device; 2 is a timing diagram of the operation of the control unit.

The generally accepted EDSP structure (for example, CB2-10C) consists of a magnet of a flexible cylinder 1. covers 2 are made of an insulating material, have a permanent magnet 3. pole tips A, and a coil 5 of two counter-wound windings on the frame b suspended on springs 7. The magnet block 3 with pole pieces 4 is clamped by the caps 2 through insulating washers 8, which also provide isolation of the coil 5 leads, the output signal of which through the springs 7 is fed to the leads 9. The device includes current generators 11 and 13, analog switches 10 and 12, analog-digital ntegrator 14, registers 15 and 16 of the memory, digital adder 17, calculation unit 18, a control unit 19 comprising a pulse generator 20, counter 21, circuits 22-26 generate the control signals.

The outputs of current generators 11 and 13 through analog switches 10 and 12 are connected to one of pins 9 EDSP and the input of analog-digital integrator 14, the information outputs of the latter are connected to information inputs of registers 15 and 16 of memory, the outputs of flip-flops are connected to inputs of a digital adder 17 The outputs of the latter and the outputs of the register 16 are connected to the inputs of the block 18 calculations. The control inputs of the keys 10 and 12, the reset input of the integrator 14, the write inputs of the registers 15 and 16, the control input of the computation unit 18 are connected to the control outputs of the control unit 19, in which the output of the pulse generator 20 is connected to the input of the counter 21, the trigger outputs of which are connected to the inputs of the control signal formation circuits 22-26.

The operation of the device consists in forming, monitoring and processing the signals associated with the movement of the coil 5 from the covers 2 to the equilibrium position after the Start (Reset) signal is applied to the counter 21 of the control unit 19. The deviation of the coil 5 to the covers is provided by applying a current to the coil of a corresponding value from the current generator (11 or 13) through the switch (10 or 12). controlled by the signal from the corresponding output of the control block 19 (drivers 22 or 23) with simultaneous zeroing of the integrator 14 by the signal from the output of the driver 24 of the control block 19. The polarity of the current determines the direction of displacement of the coil 5, and the duration is selected based on the condition of ensuring that the coil 5 is reliably pressed to the covers 2 or other coil travel limiters.

At the end of the current pulse, when coil 5 is disconnected from the current generator, the process of moving the coil to the initial position begins. The voltage E (t). generated in the coil and output through pins 9, is determined by the ratio

E (t) -K-X (t), (1)

where K - KEMS EDSP;

X - move the coil.

The movement of the coil, generally defined as / X (t) dt, is equal to

 E (t) "dt with t-.

(2)

where t is the integration time until the transients are completely damped.

Thus, after rejecting the coils 5 up and down and integrating the signal E (t) by the formula (2) c. the corresponding conversion will generate the results (A1 and A2), fixed in registers 15 or 16 of memory, respectively (by signals from drivers 25 or 2 6 of the control unit 19) and proportional to the distance traveled from the corresponding cover to the equilibrium position, 17 of the integration results, proportional to the sum of the gaps between the edges of the coil 5 and the covers 2. In this case, the relative position of the coil 5 is defined as n - A1 A1 - LA2 and is calculated in block 18. The current generators 11 and 13 form a current with 5-10 TD, which ensures that EDSP with a frequency of natural oscillations of 5-10 Hz ensures that the coil 5 is pressed against the covers 2. The current supply time is not more than 0.5 s. Integration time does not exceed 2s. Analog-to-digital integrator 14 can be built on the basis of a series-connected frequency converter and a counter or an analog integrator and an analog-to-digital converter. The ratio calculation unit 18 (3) can be performed either on the basis of microprocessor-based ICs, or on the basis of programmable permanent memory devices or logical arrays, when, when the A1, (A1 + A2) codes are applied to their inputs. 22-26 are built on the basis of coincidence circuits that combine the outputs of the corresponding triggers of counter 21 and ensure the formation of im-. pulses control the required duration (see Fig.2). The technical and economic effect of using the proposed invention is mainly due to the exclusion of seismic data distortions possible when using EDSP with KSTyui shifted from the nominal position. 7

Claims (2)

F1 / L / Formula of Invention 1. A device for determining the position of a coil in an electrodynamic seismic receiver, containing the first current generator and analog switch, analog-digital integrator, control unit and computing unit, while the generator output is connected via an analog switch to the receiver input connected to the input the analog-digital integrator, the outputs of the control unit are connected to the control inputs of the analog switch, the analog-digital integrator and the calculation unit, in order to increase the In addition, a second current generator and an analog key, two memory registers and a digital adder are entered into the device, the output of the second current generator through the second analog key is connected to the input of the seismic receiver, the information outputs of the analog-digital integrator are connected to the information inputs of the memory registers, the outputs of which are connected to the inputs of the digital su mater, the outputs of which and the outputs of one of the memory registers are connected to the inputs of the computing unit, and the outputs of the control unit are connected to the control inputs of the second analogue Vågå key and the memory registers. . 2. A device according to Claim 1, characterized in that, for the sake of simplicity, the control unit comprises a pulse generator connected to the counter input, the outputs of which are connected to the corresponding outputs of the control unit through signal conditioners. Start {Oh open n  I I l / HTerpu Hueva Record B .15 Jt Crit cffpoc if integration: SanuctSjs bj number ej8 ig. g P