SU1108206A1 - Apparatus for determining the time of propagation of elastic waves through rock body - Google Patents

Abstract

A DEVICE FOR DETERMINING THE TIME OF SPREADING OF ELASTIC WAVES IN THE MASSIF OF HORNB1X BREED, containing two sensors, the outputs of which through appropriate amplifiers are connected to the inputs of the OR element, the output of which is connected to the input of the differential discriminator, the first output of which is connected to the input of the forming key, and the second output is connected to the input of the forming discriminator. the input of the first element And, to the other input of which the generator output is connected, and the output of the first element And is connected to the counting input of the first reversible counter, the control input of which It is connected to the output of the forming key, the trigger, the unit output of which is connected to the first input of the second element I, the second input of which is connected to the generator output, and the second reversible counter, the code output of which is connected to the display unit, characterized in that increase measurement accuracy and simplify the design of the device, the output of the forming key is connected to the clock input of the tripper, the output of the second element I is connected to the counting input of the second reversal (A meter, and the zero output of the first reversible The meter is connected to the control of the second reversible meter input. 13 о СХ) ю о Oi

Description

Hera. The first impulse to / pochkaza111 .1Y the trigger should be to put it in position “1”, and the second impulse to the position “O. Connecting the output of the second element AND to the counting input of the first reversible10 counter is necessary in order to |> 1 pass the generator pulses in the time interval corresponding to the location of the trigger to position “I.

Connecting the control input of the NERVO1CH) reversible counter to the output of the second reversible counter is necessary to switch the first reversible counter to the “Subtract at the time” mode corresponding to zeroing of the second reversible counter.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - time diagrams of his work.

The device contains two sensors 1 and 2, the outputs of which through the corresponding amplifiers 3 and 4 and the element OR 5 are connected to the input of the differential discriminator 6, the first output of which is connected to the first input of the first element And 7, the second input of which is connected to the output of the generator 8, trigger 9 The output of which is connected to the first input of the second element I 10, the second input of which is connected to the output of the generator, and the output to the counting input of the second reversible counter 11, the control input of which is connected to the output of the first reversing counter 12, and the code output is with the input of the display unit 13, and the preemptive key 14, whose input is connected to the second output of the differential discriminator, and the output to the trigger input of the trigger and the control input of the second reversible counter, the counting input of which is connected to the output the first element AND 6. In addition, the differential elements 15 and 16, the element OR 17 and the key 18 are included in the differential discriminator.

The device works as follows.

Elastic waves, excited by a source (not shown), propagate in the array and reach sensors 1 and 2, causing them to trigger, the sensor working closest to the source, for example sensor 1, triggered first. The signal from this sensor after amplification by amplifier 3 ( 2, a; the signal at point A) passes through the element OR 5 and enters the input of the differential discriminator 6, causing the successive triggering of the threshold elements 15 and 16 of the lower Uj and upper Vi levels, respectively. When triggered, the threshold elements form pulses that pass through the OR element 17 to the key 18, from the output of which a rectangular impulse equal to the duration of the rise time tj is removed.

Signal.K in gochka.L (fsh L. o I. UMog right mr, 1nyn MMiiy.ibc:) give; s on the right side of the Huni input e. And 7 and opens eio at time tf. during which the counting imperials of the generator 8 fill the peBeiKiiBHiiii counter 12. |: 1 operating in the mode “C ,, iyuzhna ((jiiir. 2. c). At the time of injection. corresponding to the triggering lopoiOBoro element 16 i iHHeio level sishala at point L. ( )) () 1shir t "11i1Y key 14 gives out ie | i0 out) С (i (inr. 2. g), which comes, firstly, to the control input of the reversing counter 12 and puts it into countdown mode, t . E. In the mode “E Read (the counter will start in this mode later - - - with the arrival of the next batch of pulses from the output of the element And 7) and. Secondly, the tripper clock input 9, setting it to the position "1 (initially, the trigger was found, 1c to the position" O), while the potential level Q and corresponding) to the logic level "1, from the single output of the trigger (Fig. 2e) is fed to the control input of the AND element 10 and opens it. allowing the input of counting pulses of the generator 8 to the input of the revision counter 11, operating in the “Addition” mode (FIG. 2, e).

The signal from sensor 2 after amplification by amplifier 4 (Fig. 2, a, the signal at point B) is fed through the element OR 5 to the differential discriminator 6, causing the threshold elements 15 and 16 of the lower and eepXHeio levels to be triggered and the key 18 is formed at the output an impulse equal in duration to the rise time i

C signal at point B (Fig. 2, b). This rectangular pulse reopens element 7, through which the counting pulses of the generator 8 begin to arrive at the input of the reversing counter 12 (Fig. 2. c). The content of the latter is reduced (so

as previously, the counter was transferred to the “Subtraction” mode and after a time equal to t, becomes zero. At this point in time, the signal "Resetting from the output of the reversible counter 12 (Fig. 2, g) received at the control input of the reversible counter 11, transfers it to the Subtract mode, the measurement error correction cycle D1 t -tj begins.

In the Subtract mode (Fig. 2, h), the content of the counter 1 1 decreases (by an amount proportional to t) until the generating key 14 operates, the second pulse from the output of which (Fig. 2, d) returns the trigger 9 on the clock input to the initial position "O (Fig. 5 2, d), the resolving potential from the control input of the element 10 is removed, the flow of the generator 8 pulses to the reversible counter 11 stops. a count displaying the ICMs expanding ia4t in .iav4iitH i4). spool:

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Signal

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Claims (1)

DEVICE FOR DETERMINING THE TIME OF ELASTIC WAVES PROPAGATION IN A ROCK ARRAY, containing two sensors, the outputs of which are connected through inputs of OR to the inputs of an OR element, the output of which is connected to the input of a differential discriminator, the first output L-P / G ] ΐΰ eleven 13 which is connected to the input of the forming key, and the second output is connected to one input of the first element And, the output of the generator is connected to the other input, and the output of the first element And is connected to the counting input of the first reversible counter, the control input of which is connected to the output of the forming key, trigger, a single output of which is connected to the first input of the second element And, the second input of which is connected to the output of the generator, and a second reversible counter, the code output of which is connected to the display unit, characterized in that, with Strongly improve the measurement accuracy and simplify the construction of the device for forming the output switch is connected to the clock input of the flip-flop, the output of the second AND element is connected to the counting input of the second down counter, and the output of the first zero-down counter connected to the control input of the second down counter.