SU573071A1 - Device for ultrasonic quality control of materials - Google Patents

Description

The device relates to the field of non-destructive methods and means of quality control of materials and can be used to measure the acoustic parameters of materials.

A device for measuring the propagation time of ultrasonic vibrations in materials under interference conditions is known, comprising a synchronizer, an ultrasonic vibrations generator, transmitting and receiving electroacoustic transducers, a delay circuit, an amplifier, and an integrated driver of delayed pulses.

transmitting and receiving electro-acoustic transducers, an amplifier of received signals and an integrated driver of delayed pulses, a delay unit, the input of which is connected to the output of the synchronizer, and an indicator.

This device has low reliability in the presence of interference.

In order to increase the reliability of control, the proposed device is equipped with a pulse-width discriminator and a shaper of temporary gates, one input of which is connected to the output of the delay unit, the other input to the shaper

However, this device has low reliability and performance, since the time of a single measurement with significant sound bases is long.

The closest to the proposed invention is device ₂ with ultrasonic quality control of materials, comprising connected electroacoustic sequentially synchronizer generator of ultrasonic vibrations pezaderzhannyh pulses, and an output coupled to an indicator, the discriminator input is connected to shaper delayed pulses, and the output -. With the indicator • On FIG. 1 shows a block diagram of a proposed device ₂₀ ; in FIG. 2 is an embodiment of an integrated driver of delayed pulses, ¹ in FIG. h, 3 - stress diagrams of individual units of the device.

. The proposed ultrasonic device contains electro-acoustic sequentially interconnected synchronizer 1, ultrasonic oscillation generator 2, transmitting electro-acoustic 5 transducer 3, receiving electro-acoustic transducer 4, amplifier 5, integrated driver 6 of delayed pulses, pulse-width discriminator 7, indicator 8. K the output of the synchronizer is connected in series to the delay unit 9 and the time gate driver 10, the output of which is connected to the indicator.

The device operates as follows.

The synchronizer 1 generates a continuous sequence of pulses (Fig. 3, a), which starts the ultrasonic oscillation generator 2 and enters through the delay unit 9 (Fig. 3, f) to the start input of the shaper 10 of the temporary gate.

The ultrasonic oscillation generator 2 generates pulses exciting the transmitting electro-acoustic transducer 3. The ultrasonic vibrations pulses that have passed the test sample 11 are received by the receiving electro-acoustic transducer 4 and amplified by an amplifier 5, the output signal of which together with the interference is shown in FIG. 3.6. The output of the amplifier 5 is connected to the input of the integrated driver 6 of the delayed pulses, which converts the signal from the output of the amplifier 5 into video pulses (Fig. 3). These pulses are fed to the input of the stop driver 10 of the time gate and to the pulse-width discriminator 7, which is configured to follow the pulses of the synchronizer 1, which, in turn, is equal to the period of the useful signal at the output of the amplifier 5. From the output of the pulse-width discriminator 7 to indicator 8 input pulses of resolution indication (Fig. 3, d) and pulses of the shaper 10 of the temporary gate.

Thus, if the interference at the output of the amplifier 5 forms a continuous signal with a useful signal (Fig. 3, b), then the period of the signal from the output of the integrated driver 6 of the pulses delayed by it—] (Fig. 3, d) differs from the period of the synchronizer pulses 1, and there will be no resolution permission (Fig. 3, h).

The integrated delayed pulse shaper can be performed, for example, according to the block diagram shown in FIG. 2.

The scheme works as follows. The c-output signal of the amplifier 5 is supplied to the former 12, which converts the signal into video pulses (Fig. 3, c). These pulses are fed to circuit 13 And to the second input of which 15 pulses are received from the output of the reference oscillator 14. At the output of circuit 13 I, pulse trains (Fig. 3, d) are formed, which are fed to the input of adder 15, at the output of which pulses 20 are generated (Fig. . 3, e) upon its overflow.

This goal is achieved by the fact that the measurement of the time interval is carried out for several periods of following the pulses of the generator of ultrasonic vibrations. At the same time, the interference that is not fused to the useful signal is eliminated by the adder, but the interference fused to the useful signal using the latitude-30 pulse correlator discriminator.

Claims (2)

The device relates to the field of non-destructive methods and means of controlling the quality of materials and can be used to measure the acoustic parameters of materials. A device for measuring the propagation time of ultrasonic oscillations in materials under interference conditions is known, which comprises a synchronizer, an ultrasonic oscillator, a receiving and transmitting electroacoustic transducers, a delay circuit, an amplifier, and an integral delayed-pulse driver. However, this device has low reliability and performance, as the time of a single measurement with significant sound bases is long. The closest to the proposed invention is a device for ultrasonic quality control of materials, comprising an ultrasonic oscillator, emergency and receiving electroacoustic transducers connected to electroacoustically synchronized, a received signal amplifier and integral driver of delayed pulses, a delay unit, whose input is connected to the synchronizer output, and shshchikator. This device has low reliability in the presence of interference. In order to enhance the control, the proposed device is equipped with a pulse-width discriminator and a temporary gate driver, one input of which is connected to the output of the delay unit, another input to the driver of delayed pulses, and the output is connected to the indicator, the input the discriminator is connected to the driver of the delayed pulses, and the output - with the indicator. Fig, 1 shows a block diagram of the proposed device; in fig. 2 shows an embodiment of an integrated delay pulse generator; FIG. 3 - plots of individual units of the device. The proposed ultrasound device contains electro-acoustic sequentially interconnected synchronicator 1, oscillator 2 ultrasonic, transmitting electroacoustic transducer 3, receiving electr acoustic transducer 4, amplify 5, integrated driver 6 delayed pulses, pulse-width discriminator 7, indicator 8. To synchronizer output connected sequentially connected block 9 delay and shaper 10 temporary gate, the output of which is connected to the indicator. The device works as follows. The synchronizer 1 generates a continuous sequence of pulses (Fig, 3, a), which starts the generator of ultrasonic vibrations and arrives at the input 9 of the delay (Fig, 3, e) at the input of the start of the time generator 10 of the gate. The ultrasonic oscillator 2 generates pulses that excite the transmitting electroacoustic transducer 3. The ultrasonic vibrations pulses that have passed through the test sample 11 are received by the receiving electroacoustic transducer 4 and amplified by an amplifier 5, the signal to the outputs of which, together with the interference, is shown in FIG. 3.6. The output of the amplifier 5 is connected to the input of the integrated shaper 6 delayed pulses, which converts the signal from the output of the amplifier 5 into video pulses (Fig. 3). These pulses are fed to the input of the stop imager 10 temporary gates and to the pulse-width discriminator 7, which is configured to send the pulses of synchronizer 1, which, in turn, is equal to the period of the useful signal at the output of the amplifier 5. 7, the indication resolution pulses (Fig. 3e) and the generator of the 10 temporary gates arrive at the input of the indicator 8. Thus, if the interference at the output of the amplifier 5 forms a continuous signal with the useful signal (Fig. 3, b), then the signal following period from the output of the integrated former 6 delays and pulses (Fig. 3, e) differs from the pulse period of the synchronizer 1, and the resolution of the indication will not (Fig. 3.3). The integral delayed pulse driver can be executed, for example, according to the block diagram shown in FIG. 2. The scheme works as follows. the signal from the c-output amplifier 5 enters the shaper 12, which converts the signal into video pulses (Fig. 3, c). These pulses come to the circuit 13 and to the second input of which impulses come from the output of the reference oscillator 14. At the output of the circuit 13 I, a burst of pulses (Fig. 3, d) is received, arriving at the input of the adder 15, at the output of which pulses are generated (Fig. 3 , e) at its overflow. This goal is achieved by the fact that the measurement of the time interval is carried out for several periods of the pulse of the generator of ultrasonic vibrations. At the same time, the interference is not combined with the useful one, it is eliminated by the adder, and the interference is combined with the useful signal - with the help of the patch-pulse discriminator of the correlator. Apparatus of the Invention A device for ultrasound quality control of materials, comprising a synchronizer connected in electroacoustic series, an ultrasonic oscillator, transmitting and receiving electroacoustic transducers, an amplifier of received signals and an integral delay pulse generator, a delay unit whose input is connected to the synchronizer output, and an indicator e with the fact that, in order to increase the reliability of the control, it is equipped with a pulse-width discriminator and Telem time gate one input of which is connected to the output of the delay unit, the other input - a delayed pulse shaper, and the output is connected to an indicator, the input of the discriminator is connected to the delayed pulse shaper, the output - to the indication. .one 12 JUVVA uz.Z