SU989470A1 - Ultrasonic flaw detector - Google Patents

Description

(54) ULTRASOUND DEFECT TESTS

- one

This invention relates to Hepaapyma ultrasound testing techniques and can be used for KOHTV products in various industrial sectors.

Known ultrasonic flaw detector containing a synchronizer, a generator of probe pulses, a transducer, a delay stage, the input of which is connected to the output of the synchronizer, a generator of reference pulses, an adder and a threshold stage 1.

The disadvantage of this flaw detector is low control accuracy.

The most sophisticated invention of the technical essence and the achieved result is an ultrasonic flaw detector containing a series, connected synchronizer, probe impulse generator, transducer amplifier, detector and amplitude selector, pulse shaper, series-connected video amplifier and indicator, and sweep generator, on chenny mezkdu synchronizer and indicator G,

A disadvantage of the known flaw detector is the low accuracy of control due to the absence of frequencies of phase-to-phase selesh signals from interference.

The purpose of the invention is to improve the accuracy of control.

The goal is achieved by

10 that the ultrasonic flaw detector is equipped with a pulse-connected reference pulse, in series. which is connected to the output of the pulse driver, and a phase detector, included

15 between the video amplifier and the generator of the reference pulses and connected with the amplifier's course, and the input of the pulse generator is connected to the amplitude output: of which selector.

20

Claims (2)

FIG. 1 is a block diagram of an ultrasonic flaw detector} in FIG. 2 temporary diagrams, according to the work of the scheme. The ultrasonic flaw detector contains a synchronizer 1 connected in series, a generator 2 probing pulses, a converter 3, an amplifier 4, a detector 5, an amplitude selector 6, a pulse former 7, a fender 8 reference pulses, a phase detector 9, video amplification 10 and indicator 11. Between the synchronizer 1 n indicator 11 on the generator 12 sweep. The output of the amplifier 4 is connected to the second input of the phase detector 9. The ultrasonic flaw detector works as follows. Synchronizer 1 starts a horizontal sweep 12 sweep and generator 2 probe pumps. The probe pulse generator 2 excites in the transducer 3 ultrasonic vibrations, which are introduced into the controlled product. The echo signal 13 reflected from de (}) (Fig. 2) is amplified in amplifier 4 and fed to the inputs of the detector 5 "phase detector detector 9. From the output of detector 5, the pulses 14 are sent to amplitude selector 6i where their amplitude selection occurs depending on from the set cutoff level. The maximum amplitudes of the pulses 15 of the detected echo signal are fed to the input of the former 7 pulses. The pulse shaper 7 generates the pulses 16, the fullness and temporal position of which corresponds to the remoteness and the temporary position of the output pulse set of the amplitude selector 6. The generated pulses then arrive at the input of the generator 8 of the reference pulses, which is an autogenerator; the pulse generator 7 is fed. The pulse filling frequency 17 of the generator 8 of the reference pulses is equal to the frequency of the generator 2 of the probing pulses. Thus, let the pulse power of the generator 8 of the pulse reference correspond to the pulse duration of the driver 7, and the oscillation phase of the generator 8 of the reference pulses coincides with the phase of the echo signals of the amplifier 4. The received 8 kmpulses 17 of the generators are sent to another input of the phase detector 9, with which Frequency selection signals 18 from interference. Phase detector 9 introduces the role of a mixer, the output voltage of which is determined by the frequency and phase of two input signals - the reference pulse generator 8 and amplifier 4. Thus, the interference signals, regardless of their amplitude, but different from the useful signal in frequency and phase, the output of the phase detector 9 are missing. The selected useful signals 19, coinciding in frequency to the phase with the pulses 17 of the generator 8 of the reference pulses, from the output of the phase detector 9 through the video amplifier 1O go to the indicator 11. The invention allows to perform quality control with precise accuracy. pipes and reduce their perebrakovku on average by 1%. An ultrasonic flaw detector comprising a series-connected synchronizer, a probe generator, a transducer, an amplifier, a detector and an amplitude selector, a pulse shaper, a series-connected video amplifier and an indicator, and a sweep generator connected between the synchronizer and the indicator, characterized in that accuracy of control, it is equipped with series-connected gene ator of reference pulses, the input of which is connected to the output of the driver owls, and a phase detector, vklyuchenny between the video amplifier and reference oscillator tgmpulsov and connected to the output of the amplifier and shaper kmpulsov input connected to the output amplntudnogch) selector received information sources into account for examination 1. Copyright certificate USSR № 715992, cl. QOlNl 29/04, 1977. 2. USSR author's certificate number 757976, cl. QOIN. 29 / D4, 1976 (prototype).