SU1499116A1 - Ultrasonic depth-meter - Google Patents

Abstract

This invention relates to ultrasonic non-destructive testing. The aim of the invention is to increase the sensitivity of thickness control due to the formation of a two-pulse sounding signal and in-phase summation of pulses in the receiving path. The two-pulse probe signal is generated by delaying the excitation pulse for a time equal to its duration and summing the resulting pulses. In the receiving path, the received pulse is delayed at the same time, summed with the non-delayed one, and a double amplitude pulse of the initial duration is extracted. 2 Il.

Description

The invention relates to the field of ultrasonic non-destructive testing and can be used in various fields of engineering to control the thickness of products made from a material with a high attenuation of ultrasound.

The purpose of the invention is to increase the sensitivity of the thickness control by forming a two-pulse probing signal and in-phase summation of pulses in the receiving path.

Figure 1 shows the structural diagram of the ultrasonic thickness gauge; Fig. 2 shows time diagrams of voltages at the main points of the circuit.

The thickness gauge of the series-connected synchronizer 1 and probe signal generator 2, subsequently connected converter 3 and receiving amplifier 4, indicator 5, are connected in series to the first electrical delay line 6 connected to the output of probe signal generator 2, the first adder 7, the second input of which is connected to the input the first electrical delay line 6, and the power amplifier 8, the output of which is connected to the converter 3, successively connected to the second electrical line 9 of the transistor, identical to the first connected to the output of the receiving amplifier 4, the second adder 10 and the first circuit And 11, the output of which is connected to the indicator 5, and the second circuit And 12, the first input of which is connected to the input of the second electrical delay line 9, the second input to the output of the second electrical 9 delay lines, output - with the second inputN

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the first circuit 1-1 and 11, and the second input of the second adder 10 is connected to the passage of the second electrical line 9 delay

The thickness gauge works as follows. Ee.

Synchronizer 1 generates video pulses of duration f. These pulses are controlled by a satellite for the generator 2 of probe signals, the output of which is circled by a radio pulse - a duration (Fig. 2a). The received radio pulse arrives at the input of the first electric pulse with time 6 delays i (AiG.2b) and to the second input of the first adder 7. Thus, the output of cyt-iMaTopa 7 produces the required double signal duration (Fig. 2b), which after amplification in the amplifier 8 can be transferred to the converter 3 and radiated in print lee

Reflection of the 1st signal after amplification in the input amplifier A is received with a time delay equal to the propagation time tp (.p of the ultrasonic signal in the product (fig.2g). This signal goes to the delay line 9 with the delay time G (fig.2d) Received and delayed signals are fed to the adder 10, the output of which produces the signal shown in php1, 2e. Such processing improves the signal-to-scrap ratio V / times due to accumulation. However, the duration of the Tto is equal to Z. keeping the same signal duration the delayed signals (Fig. 2d) are also simultaneously fed to the second circuit 12, which shortens the signal to duration d. Signals from the cyNtMaTopa 10 and second circuit 12 outputs are fed to the inputs of the first circuit 1 I. In this case, the output signal of the first circuit And II (Fig.2i) has a duration of G. In this way, while maintaining the same resolution, the resolution is

threshold sensitivity of m2 times. The signal from the hIXo of the first circuit AND 1 1 is the output and is fed to the indicator 5.

The use of a double-pulse probe signal after optimum optimization of the processing of echo pulses with coherent intraperiod summation allows, without loss in radial resolution, to increase the threshold sensitivity by 1, A times.

Claims (1)

Invention Formula An ultrasonic thickness gauge containing a serially connected c1P1 synchronizer and probe signal generator, a serially connected transducer and receiving amplifier, and an indicator that differs from the fact that, in order to increase the sensitivity due to the formation of a two-pulse probe signal and the in-phase summation of pulses the receiving path, it is equipped with series-connected first electrical delay line connected to the generator input of the probe 1 h generator, their signals, the first summation, second input d which is connected to the input of the first electrical delay line, and by a power amplifier, the output of which is connected to a converter connected in series by a second electrical delay line, with a delay time like that of the first line connected to the output of the receiving amplifier, the second adder and the first AND circuit , the output of which is connected to the indicator, and the second And circuit, the first input of which is connected to the input of the second electric delay line, the second input to the output of the second electric delay line, the output to the second input the first circuit And, and the second input of the second adder - with the input of the second electrical delay line. Tszig.1 F1 / g.1