SU1575146A1 - Apparatus for recording seismic information - Google Patents

Abstract

The invention relates to seismic information recording devices operating in continuous mode. The purpose of the invention is to increase the information content of the recorded seismic information by changing the detail of time stamps. The detail of the time stamps varies depending on the result of selecting the input signal for the presence of a seismic signal. At the end of the seismic signal, the time corresponding to the entry of seismic waves is recorded. For thermal pen recorders, the registration of a time code corresponding to the entry of seismic waves is performed by a sequential code by de-energizing the aim of the pen. The change of the recording of time stamps is made by the control unit, the input of which is connected to the signal selector. 4 il.

Description

The invention relates to seismometry and can be used in continuous analog recording of seismic information converted into an electrical signal.

The purpose of the invention is to increase the information content of the recorded seismic information by changing the detail of time stamps.

The essence of the invention is that the selector (trigger) of the seismic signal using the control unit controls the recording mode of the recorder only on a temporary channel. The selector imposes, with the basic requirement of reliability of selection, which is achieved by

integrating the signal for a specific time. Moreover, when registering at the moments when there is no seismic signal, the time stamps are also recorded depending on the state of the selector. their detail changes.

The detailed value of the time point of the corresponding arrival of the waves is recorded with binary sequential code 1 after the recording of the seismic signal is completed. Thus, using dependent loop break control of the perimeter galvanometer channel, controlled multiplexing of time and signal information is obtained with analog recording.

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ABOUT

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FIG. 1 shows the structural scheme of a seismic recorder; in fig. 2 - functional block diagram of the signal selector; in fig. 3 is a functional block diagram of a control unit; in fig. 4 - a seismic fragment.

The device contains seismic receiver 1, seismic amplifier 2, recorder 3, seismic signal selector 4,, control unit 5, register unit 6, commutator 7, time service unit 8, connecting circuits 9-14, control bus 15, timer bus 16, sync - emitting bus 17, control bus 18. The structure of the selector 4 of the seismic signal (Fig. 2) includes an amplifier 19, a detector 20, a comparator 21, a timer 22, an integrator with a reset 23, a threshold device 24, a register 25, connecting circuits 26-28 . The control unit 5 (FIG. 3) contains a counter 29, a trigger block 30, a logic block 31.

cops And, block 32 of the driver, block 25 of cops And and the control bus 15 in pe35

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33 elements AND-OR, block 34 of the trigger, counter 35, block 36 of the elements And, block 37 of the elements OR, block 38 of the trigger.

The seismic recorder works as follows., Q

In the absence of a seismic signal, labels 39 are recorded (Fig. 4) with an interval of 40 on the recorder 3 (Fig. 1) by de-energizing the incandescent mechanism. At the output of the selector 4, the voltage O and the control unit 5 sets the switch 7 to a position where the time stamps from the time service block 8 are received at the output of the switch 7 via the synchronization bus 17. The interval (detail) of the 40 time marks 39 is selected based on the need for identification - sections of seismograms on the one hand, and from the condition that the permissible redundancy of the time recording is not exceeded - on the other. This interval (detail) is for 1-10 minutes for continuous analog recording of seismic waves.

During the passage of seismic

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Control unit 5, which connects the output of the switch 7 to the circuit 10 of the synchronization bus 17, where 55 more detailed marks 41 take place at intervals of 42 °. Interval 42 is within 0.1-1 minutes.

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the signal at the output of the selector 4 is charged with voltage 1, the input b with a parallel binary code records an even more detailed (absolute) value of this time from the information bus 16 from block 8 of the time service.

This information is in register 6 until the end of the signal from the seismic event.

The end point of the seismic signal is determined using the selector 4.

The size of block 6 of the register is chosen from the condition of recording the time values of several seismic signals occurring with a shift less than the time required for sequential recording of the time code. In block 6, then two or more times are stored. The counter 29, trigger 30, block 31 of the elements I form an electronic switch in which type to control the recording of the account and storage of certain areas of the register block 6, in each of which time values are recorded.

At the end of the seismic signal, a positive difference occurs in circuit 13, which, together with the pulse of the timing circuit 14, through the block 33 AND-OR elements, trigger block 34, counter 35, AND block 36, and control bus 15 controls the sequential reading of the time code block 6 registers on the chain 9. Connect 0

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At the initial moment of arrival of the seismic signal (wave arrival), the comparator 21 of the selector 4 is triggered and starts timer 22. Timer 22 for a certain analysis time through circuit 26 removes the reset from integrator 23. Integrator 23 integrates the signal for analysis time. The threshold device 24, in the event of overvoltage, at the output of the integrator 23 of the threshold voltage, sets the output voltage 1, which is written to the register 25 by a synchronizing positive differential pulse across the circuit 27. Thus, the outputs of the register 25 receive a pulse shifted relative to of the operation time of the comparator 21 for a fixed time, set by timer 22. These pulses go to control unit 5 (Fig. 1). On the front of the pulse of the circuit 12, passing through the counter 29, the block 30 of the trigger, the block 31 ele5

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The parallel binary code recorder b records an even more detailed (absolute) value of this moment of time from the information bus 16 from block 8 of the time service.

This information is in register 6 until the signal from the seismic event ends.

The end of the seismic signal is determined by the selector 4.

The bit of register block 6 is selected from the condition of recording time values of several seismic signals occurring with a shift less than the time required for sequential recording of a time code. In block 6, two or more time values are then stored. The counter 29, the trigger 30, the block 31 of the elements I form an electronic switch in some way to control the recording of the account and storage by certain areas of the register block 6, in each of which time values are recorded.

At the end of the seismic signal, a positive difference occurs in the circuit 13, which, together with the pulses of the clock circuit 14, via the AND-OR block 33, the trigger block 34, the counter 35, the AND block 36 and the control bus 15 control the sequential reading of the time code from the block 6 registers in chain 9. Connection5157

The output of the switch 7 to the circuit 9 is carried out via the control bus 18. This bus consists of the circuit 12 and the outputs of the flip-flop block 38, the state of which determines whether there is an unread area in the register block 6 where the time information is . Each trigger from block 38 is reset after reading the area to which it is connected. FIG. 4 shows a consecutive time code 43 corresponding to a time instant 44. To eliminate the possibility of skipping recording of a seismic signal in this interval (Fig. 4), a signal for recording a code with a duration equal to the analysis time using a block is generated by the signal of comparator 21 (circuit 28) 32. Block 37 of the elements OR, block 34 of the trigger, the counter 35 form in some way a decoder counter and serve to determine the areas of block 6, the time,

codes from these areas. At the end of the recording of the time code 43 corresponding to the time point 44 of the entry of the wave, the bus control unit

codes for control when reading

18 toggles switch output

chains 9 to chain 11. From this point on, they begin to record again on the seismogram of mark 39 with an interval of 40. The use of the invention in comparison with the known one allows 35 to increase the accuracy of determining the moment of arrival of waves not less than an order of magnitude. Gives the opportunity to operab6

but, do not remove the tape from the drum, perform a BpeN56HH counting corresponding to the time of entry of the waves. Allows you to change the detail (interval) of timestamps depending on the presence or presence of a seismic signal.

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Claims (1)

10 claims five 0 five A device for recording seismic information containing a seismic receiver, an amplifier and a recorder connected in series, as well as a time service block, characterized in that, in order to increase the information content of the recorded information by changing the detail of time marks, the device has a seismic signal selector input connected to the input of the amplifier, the control unit, one input of which is connected to the output of the seismic signal selector, and the second to the synchronization bus of the time service unit, b register register, informational inputs of which are connected to the time service unit, and control inputs to the output of the control unit, electronic switch, one input of which is connected to the output of the register unit, and two other inputs to the synchronization bus of the time service unit, control inputs are connected to the unit control, the output of the electronic switch is subregional to the control input of the recorder.