SU1120263A1 - Device for automatic search and detection of synchronopulses from sound probe signal - Google Patents

Abstract

DEVICE FOR AUTOMATIC SEARCH AND ISOLATION OF SYNCHROIMPULSES FROM AN ACOUSTIC SIGNAL. A PROBE containing a normally closed key, a constant charge driver, a charge driver proportional to the duration of the enabling pulse, a storage capacitor, a inhibitor pulse driver, a permission pulse driver, the input of the normally closed key being the device input, the output of the constant charge driver is connected with an ungrounded pole of the storage capacitor, with an output of a charge driver proportional to the duration of the enabling pulse, and with the first input a prohibiting pulse generator, the output of which is connected to the control input of a normally closed key and to the input of a permitting impulse generator, and the output of the latter is connected to the input of a charging device proportional to the duration of the enabling pulse, in order to increase the speed of searching for synchronous pulses failure to synchronize, (L it has a shaper envelope of the acoustic signal and a comparator envelope, and the output of a normally closed key is connected to the input of the shaper acoustic guide signal and an input of permitting .vtorym pulse acoustic signal envelope shaper output coupled to an input of comparator envelope output connected to the input of the last .fermirovatel constant charge and a second input of the N :) prohibiting pulses. 35 JO

Description

The invention relates to geophysical studies of wells and can be used in geophysical instrument making, in particular in the equipment of acoustic well logging

A device consisting of a single-shot with a constant dead time ij is known.

Such a device is not sufficiently noise-resistant, since synchronization fails when a certain amplitude noise arrives at the single-vibration input.

It is also known a device containing a normally closed key, a one-oscillator with a constant dead time, a pause duration meter Between pulses. one-shot and control one-shot one-shot prohibitive pulses 21,

A disadvantage of this device is the instability of the resolving time window, the duration range of which is often greater

The closest technical solution to the invention is a device containing a normally closed key, a one-shot with a constant dead time, driver), constant charge, driver, proportional to the duration of the enabling pulse, a memory capacitor, driver forbidding pulse and the driver of the enabling pulse, the input of a normally closed key is the input of the device, and the output is connected to the input of a one-shot with a constant dead time, the exit point. one-shot with constant dead time is connected to the input of the constant-charge former, to the second input of the inhibit impulse former and to the second input of the permitting impulse, the output of the constant-charge former is connected to the ungrounded PTPTROM of the memory conformer .fC output of the former. yes, proportional to the duration of the permissive pulse, and with the first input of the inhibitor impulse generator, the output of which is connected to the control input of a normally closed key and the input form wool l resolving pulse and the output of the latter is connected to the input of charge proportional to the duration of the pulse allowing,

The device mainly solves the problem of separating sync pulses from the signal of an acoustic probe, which follow with a certain frequency

A disadvantage of the known device is that in the event of a system failure, in the most unfavorable case, the search ends after three cycles of the acoustic signal. Taking into account the inertia. operation of the equipment (for example, a time interval meter), considerable intervals of the estimated well section are excluded from consideration. For example, taking into account the transients in the it diagram when synchronization fails, up to 2–5 m of the section under study are excluded.

0 The purpose of the invention is to increase the speed of searching for clock pulses when synchronization fails.

The goal is achieved by the fact that in the device for automatic

5 of searching and extracting sync pulses from the signal of an acoustic probe, including a normally closed key, a constant charge driver, a charge driver, proportional to the duration of the resolving pulse, a memory capacitor, a forbidding driver. the driver of the enabling impulse, the input of the normally closed key being the input of the device; the output of the constant-charge former is connected to the ungrounded pole of the storage capacitor, with the output of the former, proportional to the duration of the permitting pulse, to the first input of the inhibitor impulse whose output is connected to the control input of a normally closed key and to the input of a permitting impulse generator, and the output of the latter is connected to the input of a chargeformer, portion of the duration of the permitting pulse, the shaper envelope of the acoustic signal and the comparator envelope are entered, the output is normally 7 a closed key connected to the input of the shaper envelope of the acoustic signal and to the second input of the shaper of the enabling pulse, the output of the shaper of the acoustic signal envelope is connected to the input of the envelope comparator, after the output, the input of the constant charge driver and the second input of the inhibitor pulse generator.

Fig. 1 shows the structural electrical circuit of the device; j in Fig. 2 - signal plots at various points of the circuit, explaining its operation.

The device consists of a normally closed key 1, a shaper 2 of the envelope of the acoustic signal, a comparator 3 of the envelope, a shaper of constant charge 4, a shaper of 5 charge proportional to the duration of the enabling pulse, the memory capacitor b, the forge 7 forbidding pulses ,.

D. Former 8 permitting impulses%.

The output of a normally closed key 1 included in the input circuit of the device is connected to the input of the driver 2 of the acoustic signal envelope - and to the second input of the driver 6 of the enabling pulses, the output of the driver 2 of the acoustic signal envelope is connected to the input of the comparator 3 envelope, the output of which is connected to the input of the driver 4 constant charge and the second input of the generator 7 prohibiting a pulse The output of the generator 4 of a constant charge is connected to the output of the generator 5 of the charge, proportional to the duration of a pulse with an ungrounded pole of the storage capacitor bis first input prohibiting pulse shaper 7. The output of the latter is connected to the first input of the shaper 8 of the enabling pulses and to the control input of the normally closed key 1. The output of the shaper 8 of the enabling pulses is connected to the input of the shaper of charge 5 proportional to the duration of the enabling pulse.

The device works as follows.

The device receives a sequence of acoustic signals, consisting of the actual acoustic signals and sync pulses (Fig. 2a), which through a normally closed key 1 enters the input of the driver 2 of the acoustic signal envelope and the second input of the driver 8 of the enabling pulses, C of the driver 2 of the acoustic signal envelope signal (Fig.26), the signal enters the comparator 3 envelope (figv). Under the action of the trailing edge of the output pulse of the comparator 3 envelope, the formers 4 and 7 are triggered. Former 4 generates DC current pulses, the former 7 controlled by the voltage from the memory of the common capacitor b, is the inhibitory pulse (Fig. 2d) arriving at control input of normally closed key 1.

Under the influence of the trailing edge of the inhibiting impulse of the former 7, the permit impulse 8 is started, which is closed by the first arriving impulse from a normally closed

0 key 1 (sync pulse) (figd).

Under the influence of the output impulse of the imaging unit 8, the imager of charge 5 is started, proportional to the duration of the permissive impulse, which generates impulses

5 current of opposite polarity with respect to current pulses formed by driver 4.,

In the proposed device, the generator of the acoustic signal envelope 2 is a full-wave rectifier loaded on an integrator with an integration time T ", er, where

5 sync pulse duration.

Thus, at the output of the imager 2 of the envelope of the acoustic signal, the amplitude of the envelope of the acoustic signal itself is always higher.

0 amplitudes of the sync pulse envelope and. random noise, since the duration of the acoustic signal is much longer than the duration of the sync pulse and random noise.

five

Obviously, in the first measurement cycle, when the comparison threshold is set to UQ, the device searches for an acoustic signal and extracts the sync pulse of the acoustic probe following this cycle.

The proposed device, in comparison with the known one, is characterized by simplicity of circuit implementation, has a high speed of searching for syn5 pulses after a synchronization failure and is rather noise-resistant.

Claims (1)

DEVICE FOR AUTOMATIC SEARCH AND ISOLATION OF SYNCHRONOUS PULSES FROM ACOUSTIC SIGNAL. A PROBE containing a normally closed key, a constant-charge driver, a charge-proportional generator, a storage capacitor, a inhibit generator, an enable pulse, and the normally-closed 'key input is the device input, the output of the constant-charge generator is connected to the non-grounded pole capacitor, with the output of a charge former proportional to the duration of the resolving pulse, and with the first input of the forms of the inhibitor of the inhibit pulse, the output of which is connected to the control input of the normally closed key and with the input of the resolver of the enable pulse, and the output of the latter is connected to the input of the driver of the charge, proportional to the duration of the enable pulse, characterized in that, in order to increase the speed of the search for clock pulses during synchronization failures , it has an acoustic envelope shaper and an envelope comparator, the output of a normally closed key being connected to an acoustic envelope shaper input signal and with the second input of the resolver pulse shaper, the output of the envelope shaper of the acoustic signal is connected to the input of the envelope comparator, the output of the latter is connected to the input of the constant-charge shaper and to the second input of the inhibit pulse generator.