SU728104A1 - Device for checking the identity of seismic channels - Google Patents

Description

 -1.- - / -; -.: The invention relates to the field:. seismic perhaps. ; and can & be used in field seismic infrastructure; V. . . . - .;

Known way to check seismus 9g .: receivers and device, for-th.; ..: implementations 1, based .n; apOda-; what in the coil seismic receiver 6-; a hundred current followed by the restraint of the emerging washy; vykl.yuchyu; your own; fluctuations. ;;

A disadvantage of the known devices and devices is single-channel control, as well as the impossibility of simultaneously checking various channels with preamplifiers due to the distorting effect of direct-current excitation pulses fed to the receiver, on the subsequent part of the channel.

A device is known in which a one-time control of the identity of all tested seismic receivers 2 is carried out. This is achieved due to the fact that a symmetrical bridge diode key is installed between it and the associated diagonal of all bridges together and connected

Units / Resistors and Switches. ; The element to; the source of the constant n. ..; n; apr marriage l-: .// .. - -.:. : .. not wealth; izveStynogb. devices are ats. n.rhojhodimo.st. selection of the page; gb iddtkchny dyrd; and introduction: in ..; .-channels-.soalan. syrob.annyh. mbst.ovyh; .; ./. ..capsule-containing s: filthy. There is a layer of e. -distance .check. Candidate containing; ; in;. place us-; settings; seismic receiver | preamplifier, this device stanr: vits. cumbersome m, while it is difficult to ensure its high reliability and high-.

5 booming accuracy,. . ; ; . . .

. The closest to the invention is the technical solution device | . 3, in which a seismic receiver is tested by switching on 0. Yi as one of the shoulders of the bridge that dissociates cxe№i to one of the diagonals of the bridge, an excitation voltage is applied to the electrolyte.reater) and the other diagonal is connected to the galvanometer; bridge; balancing and then disconnecting the test seismic receiver and measuring with the galvanometer the electrical voltage arising in the measuring diagonal due to the imbalance of the bridge; gyu

the magnitude of this voltage is judged on the parameters of the checked geophone,

A disadvantage of the known device is the difficulty of testing channels through it, containing preamplifiers at the place of installation of seismic receivers, due to the necessity of including switching elements into the mot circuit, and the complex task of eliminating the distorting impulses usually transmitted to the seismic station a seismic receiver over the incoming wires.

The purpose of the invention is to increase the reliability and accuracy of verification of the identity of seismic channels with n |) amplifiers located at the location of the installation of seismic receivers.

. The goal is achieved by the fact that the proposed device contains a high-frequency generator, a capacitor and a rectifier, the output of the high-frequency generator through communication wires, the connection of the capacitor and the rectifier are connected to one of the diagonals of the bridge decoupling circuit, the second diagonal of which is connected to the preamplifier seismic stations.

The drawing shows the proposed device and the following notation is adopted: 1 - seismic receiver; 2.- preamplifier; 3-5 - resistors b - high-frequency generator; 7 communication wires (cable) connecting the generator to the place of installation of the seismic receiver; 8 - straightener; 9-11 - isolating capacitors; 12 - transformer,

and sending high frequency electrical vibrations; (excitatory electrical impulses; .. and natural oscillations arising in the seismic receiver at the moments of Serving the switching off of each excitatory impulse,,

The device works as follows,. . . .

Sending high-frequency electrical oscillations U from the generator b Through the isolating capacitor 9-11, the wires 7 are transmitted to the expander 8, after which the generated excitation pulses Ug are fed to the diagonal AV of the bridge decoupling circuit, c. which the checked seismic receiver 1 is included as one of the shoulders; Balance the bridge by using a resistor 5 alternately. Another diagonal of the bridge bridge is connected via transformer 12 to the preamplifier 2. Due to the balance of the bridge circuit, an electrical voltage arises in its diagonal SD caused only by its own, oscillating mi 8,

. arising in a seismic receiver in myvieHT off this pulse.

Resistor 3 is an order of magnitude smaller, and resistor 5 is an order of magnitude greater than the resistance of the geophone;

- these conditions the resistance of resistor 4 is an order of magnitude greater than that of resistor 3. The indicated ratios between the resistances of the arms of the diverting bridge circuit ensure the normal operation of the seismic receiver 1 in the operating mode without substantially changing its sensitivity and attenuation. The capacitance of capacitors 9-11 is small enough to eliminate tangible reciprocal effects between channels when registering oscillations in the seismic frequency range. . Suitable for this purpose to use filters.

low frequencies, providing undistorted seg-oscillations in the channel operating mode. The duty cycle between the clock pulses and take is close to 0.5, and the duration of an individual pulse (i. Set, based on the duration of co6cTB; eHkHx oscillations of the seismic receiver 1 entering the channel under test.

The essence of the device does not change if the sending of high-frequency electrical oscillations from the generator output to the rectifier is not through the wires (cable) entering the seismic channel, but through any other communication channel, for example, by radio. . . .,.

The invention can be used

for simultaneous verification of the health and identity of any number of channels.

Implementing the device allows to increase the accuracy and reliability of seismic observations when working with seismic receivers equipped with preamplifiers or containing up to their installation units that implement channel compaction (transformers, transducers, etc.), for example, with vertical seismic profiling, where the urgent task is to increase the channel sensitivity when vibrations are excited by power sources (for example, non-explosive ground sources), the placement of preamplifiers inside the probe s l create prerequisites effective use of such schemes to verify the seismic Anal. Another area of application for this invention is testing the performance of channels of seismic stations containing seismic receivers with preamplifiers and transducers for channel amplification, which allow transmitting information from hundreds or more seismic receivers via several wires (outdoor variants of seismic stations).

Claims (2)

Invention Formula A device for verifying the identity of seismic channels, containing a pavement evolving circuit, in one of whose arms a seismic receiver is connected, through a preamplifier and communication wires connected to a seismic station, characterized in that, in order to increase reliability and accuracy of verification, the device contains a high-frequency generator isolating capacitor and rectifier, the output being A high-frequency generator is connected through one of the diagonals of the bridge isolation circuit, the second diagonal of which is connected to the station through a preamplifier via a preamplifier, through telecommunication wires, uncoupling capacitances, and ffl voltages. Sources of Information taken into account during Examination 1, Shnirman G, L, Electric methods of calibration of electrodynamic seismographs and vibrographs,. Proceedings of the Seismological Institute of the Academy of Sciences of the USSR, vol. 55, M., 1935, p .. 9. 2. USSR Author's Certificate No. 182350, class .. G01 V 13/00, five Q01 V 1/16, 05.25.66. 3 .V (4E, Eniore PLTtie appEncatidn oi tlie .E, impedance. -Br-iagie tot-he caEitv ation oi eieotvomosp-net.ic seAsrnogr-ophs.Bu. E.et-in o -Wie Seismoeog icc (t Sooiet o A.Tner- (ca, v.49,959, pp (prototype). 0