SU1022093A1 - Method of identity check of geophone group - Google Patents

Abstract

THE METHOD OF CHECKING THE IDENTITY OF THE SEISMOSPREEMN1 0V GROUP, including the strengthening of the tested seismic collectors on the vibroplatform and the excitation of its oscillations, is so that, in order to increase the performance of the method, the seismic receivers connect in parallel and compare the current in each seismic figure to a figure and figure of a figure and a figure and a figure of a figure and a figure and figure.

Description

The invention relates to seismic detection equipment and can be used to verify the health and identity of seismic receivers, which are included in a certain group, for example, the group of the corresponding channel of the seismic survey station. A known method for calibrating seismic receivers on a vibrating table, including strengthening them on a vibroplatform and excitation with a variable force c. given frequency range L1J. The disadvantages of this method are the need for time-consuming while controlling the identity of a large number of test seismic receivers and large dimensions and the necessary equipment. The closest technical solution to the invention is a method for verifying the identity of a group of seismic receivers, including strengthening the tested seismic receivers on a vibrating platform and exciting its oscillations. At the same time, the group of seismic receivers is switched on alternately as exciters of harmonic or pulse oscillations, then as receivers of oscillations 21. The disadvantages of this method are the large costs of time for measurement and the lack of accuracy of measurements. The purpose of the invention is to increase the productivity and decrease the measurement error. This goal is achieved by the fact that according to the method of checking a group of seismic receivers, including reinforcement of the tested seismic receivers on the vibropath and the initiation of its oscillations, the seismic receivers are connected in parallel and compare the current in each seismic receiver with the reference one. The method is carried out as follows. The test seismic receivers are attached to the vibroplatform symmetrically with a group of vibration-stimulators, which can be used as electrodynamic seismic receivers. If the working coils of the group of electrodynamic seismic receivers (excitation group) are applied to a harmonic or impulse current, this causes a movement of the vibroplatform on which the group of test subjects is installed. as a result, the latter come into harmonic or pulsed motion with a certain speed Y. In this case, in each of the M seismic receivers of the test group, an electrical signal Ut VSjYi is generated, where the sensitivity of the seismic receiver is. When the seismic receivers of the test group are connected in parallel, a weighted average voltage arises at the connection clamps, which can be expressed as -I.Um, m impedance m-ro signal teffle tT, nickname; Z (tG impedance of parallel connection of the whole group, except for the HG th seismic receiver: (Zm-tn t frn- resistance of the current meter in the circuit of the tn-th seismic receiver. If Um t (J cf in the circuit of the m-th seismic receiver the current will flow As a result, the current tJ | can be a measure of the identity of the ifTi seismic receiver (a measure of the deviation of this signal UmOT of the average level). The current meters are equipped with indicators that are triggered by the passage of the current of a given magnitude. When comparing the frequency characteristics, the results of the test receivers to the vibration pickup seismic receiver The intermittent pulsed voltage is applied to the test group, in which case a wide spectrum of the probing signal simultaneously acts on the test group, which makes it possible to measure the nonidentity of the frequency characteristics from the difference in transient responses of each Itl-ro receiver and the weighted average value of the entire group. that the seismic receiver parameters of this channel differ from the average level by more than the allowable value. So the whole process

310220934

calibration is reduced to level checking. Thus, parallelism

The indicator triggered in two re-times, testing the entire group of test seismic probes — harmonic, cog-receivers, and the possibility of rejecting

yes binary-sensitized match

pulse, when checked - s (yes - no) based on the response

Coincidence of frequency characteristics — or the indicator malfunctions — does not require much time. It requires a significant increase in the production of the experiment, which is obscure as compared with modern devices. The provision of the regeneration stations is used up to the impossibility of separate testing as

how many hundreds of seismic receivers, sensitivity, and parameters

This requires the speed of their test-frequency response allows

Ki. Increase the measurement accuracy.

Claims (1)

METHOD FOR CHECKING THE IDENTITY OF A GROUP OF SEISMOS, including mounting the tested geophones on a vibrating platform and exciting its vibrations, with the fact that, in order to increase the productivity of the method, geophones are paralleled and the current in the circuit of each geophones is compared with reference. > 1 1022093