SU1469445A1 - Generator of sounding radio pulses for ultrasonic check - Google Patents

Abstract

The invention relates to acoustic non-destructive testing methods and can be used for defectoscopy and the study of the physicomechanical properties of materials by a pulsed acoustic method. The aim of the invention is to increase the stability of the initial and final phase of a radio pulse due to the independence of the driver level of the driver from the duration and period of the video pulses. The generator 1 harmonic oscillations generates a continuous signal from which shaper 3 receives rectangular pulses arriving at the counting input of K-flip-flop 4. When entering the I and K inputs of antiphase pulses from the generator of 5 video pulses at the time T of the arrival of the next counting pulse the controlled amplifier 2 will turn on, in the absence of signals at the I and K inputs, the next counting pulse 1 will turn off the amplifier 2 and the harmonic oscillations will stop. 2 nl. SL

Description

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The invention relates to acoustic non-destructive testing methods and can be used in flaw detection and control of the physical and mechanical properties of materials by a pulsed acoustic method.

The purpose of the invention is to improve the stability of the initial and final phase of a radio pulse due to the independence of the driver level of the driver from the follow-up period and the duration of the video pulse.

FIG. 1 shows a structural diagram of the generator; in fig. 2 - signal plots at various points of the circuit.

The generator of probe pulses contains a generator of 1 harmonic oscillations, an adjustable nasipitel 2

The pulse (Fig. 2e) always contains an integer number of oscillations generated by the generator 1. The pulses (Fig. 2d) control the power amplifier 2, allowing it to work during its appearance. As a result, radio pulses appear at the output of amplifier 2, (Fig. 2e). The delay between the oscillations of the radio pulse and the reference sine wave of the tunable frequency generator is minimized and equal to the time (running one trigger. This

the delay does not depend on the frequency of execution. The operation of the generator is synchronized with the device, which includes it, and the duration of the radio pulse is determined by the duration of the sync pulse. It is very important that when

power, shaper 3 pr mogol -20 change the duration of the sync pulse

impulses, 1K-trigger 4 and a generator of 5 video pulses. The generator 1 and amplifier 2 are connected in series, the input of generator 3 is connected to the output of the generator, the output is connected to the counting input of the 1K-flip-flop 4, the I and K inputs of which are supplied with opposite-phase clock pulses from the direct and inverse outputs of the 5 video pulses the output of the trigger 4 is connected to the 30 with the control input of the power amplifier 2, the output of which is the output of the probe radio pulse generator

the number of oscillations in the radio pulse remains intact. Therefore, the phase of the first and last oscillations, determined by the level of the driver of the driver, is always the same. This ensures a minimum of reverberation noise. The period of the radio pulses is equal to the period of the clock pulses and does not depend on the reference frequency.

Claims (1)

Invention Formula Probe radio pulse generator for ultrasonic testing, containing connected in series The generator works by following the mode, with the generator of harmonic oscillations and, at once. After turning on the power, generator 1 continuously generates a sinusoidal signal (Fig. 2b), and driver 3 generates a direct signal from them. coal pulses (Fig. 2c), rigidly attached to a certain level of sinus signal. Upon the arrival of the sync pulse (Fig. 2a), the trigger 4 is driven by the decay of the first pulse (Fig. 2d) and is reset by the decay of the same pulse after the sync pulse ends (Fig. 3a). Thus, pulses are formed (Fig. 2e), the fronts of which are rigidly tied to a certain level of the sinusoid (Fig. 2b) and are delayed only for the trigger time, and in 40 45 50 1 An adjustable power booster, whose output is the output of a probe pulse generator, and a gating pulse shaper, connected to the control input of a controlled power amplifier, characterized in that, in order to increase the stability of the initial and final phases of the radio pulse, the gating pulse shaper is made in the form of a 1K-trigger, and the probe pulse generator is equipped with a rectangular pulse shaper, which is connected between the output of the harmonic oscillator and the equal in House K-trigger, and video pulses generator, the forward and inverse outputs are connected respectively to I- and K-inputs triggeoe. 69A452 The pulse (Fig. 2e) always contains an integer number of oscillations generated by the generator 1. The pulses (Fig. 2d) control the power amplifier 2, allowing it to work during its appearance. As a result, radio pulses appear at the output of amplifier 2, (Fig. 2e). The delay between the oscillations of the radio pulse and the reference sine wave of the tunable frequency generator is minimized and equal to the time (running one trigger. This the delay does not depend on the frequency of execution. The operation of the generator is synchronized with the device, which includes it, and the duration of the radio pulse is determined by the duration of the sync pulse. It is very important that when change the duration of the sync pulse the number of oscillations in the radio pulse remains intact. Therefore, the phase of the first and last oscillations, determined by the level of the driver of the driver, is always the same. This ensures a minimum of reverberation noise. The period of the radio pulses is equal to the period of the clock pulses and does not depend on the reference frequency. Invention Formula Probe radio pulse generator for ultrasonic testing, containing connected in series harmonic oscillator and, 1 An adjustable power booster, whose output is the output of a probe pulse generator, and a gating pulse shaper, connected to the control input of a controlled power amplifier, characterized in that, in order to increase the stability of the initial and final phases of the radio pulse, the gating pulse shaper is made in the form of a 1K-trigger, and the probe pulse generator is equipped with a rectangular pulse shaper, which is connected between the output of the harmonic oscillator and the equal in House K-trigger, and video pulses generator, the forward and inverse outputs are connected respectively to I- and K-inputs triggeoe.  / yywwwvvvvwvv Zhiishpplepplsh ih fig 2