SU1295327A1 - Ultrasonic device for quality control of materials - Google Patents

Abstract

The invention relates to non-destructive testing of materials using ultrasound. The purpose of the invention is to increase the productivity of control and accuracy. Synchronizer 1 starts the probe 2 generator; pulses, turns on the delay element 16, sets the time interval meter 15 to the Start position and switches the trigger 10, which puts the memory elements 7 and 11 into the recording and storage modes. After a certain time interval, a strobe signal is sent from the driver 17, which opens the analog key 5, from the output of which the ultrasonic pulse signals go to the first inputs of the comparators 8 and 12, pass through the peak detector 6, the memory elements 7 and 11, go to the second inputs Comparators 8 and 12; Comparators 8 and 12 are triggered when ultrasound signals having a maximum amplitude arrive at their inputs. These signals, passing through elements 9 and 13 AND, 14 OR to the input of the time interval meter, stop the measurement process. Thus, the measurement of the time interval from the moment the probe pulse is introduced into the product to the occurrence of the maximum value of the echo signal in one probe cycle occurs. This leads to an increase in the productivity of monitoring and the accuracy of determining the coordinates of defects, 2 or more. (L with

Description

 This invention relates to non-destructive testing of materials using ultrasound.

The purpose of the invention is to improve the performance of the control and accuracy of determining the coordinates of defects,

FIG. 1 shows the block diagram of the device proposed in FIG. 2; the time diagram of the device operation.

The device contains serially connected synchronizer 1, probe pulse generator 2, receiving-transmitting converter 3, amplifier 4, analog switch 5 and

peak detector 6, as well as memory element 7 of the comparator 8, element 9, counting trigger 10, memory element 11, comparator 12 and element 13.

The counting trigger 10 is connected to the inputs of the elements 7 and II of the memory and the elements of AND 9 and 13, the outputs of the elements of AND 9 and 13 are connected to the inputs of the element OR 14, and the output of the element OR 14 is connected to the input of the meter 15 time intervals.

In addition, a delay element 16 and a pulse shaper 17 are connected in series, the output of which is connected to the input of the analog switch 5.

The device works as follows.

The synchronizer starts the generator 2 probe pulses, providing excitation of ultrasonic vibrations. The test is a monitored product, the pulses of ultrasonic vibrations are sensed by the transmitter and receiver transducer 3 and from its output are fed to the input of amplifier 4. From the output of amplifier 4, a signal amplified by amplitude is fed to the input of analog switch 5.

At the same time, the synchronizer 1 turns on the delay element 16, sets the time interval meter 15 to the Start position and switches the trigger 10, which places the memory elements 7 and 11 in the recording and storage modes, respectively. After a time interval depending on the beginning of the zone of the monitored section, the signal from the output of the delay element 16 is fed to the input of the gate generator 17, the duration of which is determined by the control zone.

The strobe from the output of the imaging unit 17 opens an analog key 5, the signal from the output of which is fed to the peak detector 6 and to the second inputs of the comparators 8 and 12. The signal amplitude from the output of the peak detector 6 is fed to the inputs of the memory elements 7 and 11.

Since the memory element 7 is in the Record mode, and the memory element 11 is in the Storage mode, the signal amplitude is memorized by the element

7, and is fed to the first input of the comparator 8. At the same time, the second inputs of the comparators 8 and 12 are supplied with a video signal from the output of the analog key 5.

Comparators Threshold

8 and 12 are determined by the amplitude of the signals of the memory elements 7 and 11.

The video signal level from the output of the analog key 5 exceeds the value of the signal from the output of elements 7 and 11 (attenuation of the signal amplitude by U value when stored in the memory elements and the peak detector),

Therefore, co-workers 8 and 12 are triggered when a video signal arrives at their second inputs, exceeding in size by the value of q the signal at their first inputs.

The signal from the output of the comparator 8 is fed to the input element And 9, and from the output of the comparator 12 - to the input

element and 13.

The trigger 10 alternately switches the elements 9 and 13, and alternately switches the elements 7 and 11 of the memory from the recording mode to the storage mode, and vice versa.

When switching on the element AND 9 through the element OR 14, a Stop signal is generated, which arrives at the second input of the meter 15 intervals

time, i.e. the time interval is measured from the moment the probe pulse is inserted into the product to the occurrence of the maximum value of the echo signal (reflected from the defect recorded in the memory element 7).

When switching on the element I-13 through the element OR 14, the Stop signal is generated, i.e. the measurement of the time interval from the moment the probe pulse is inserted into the product to the occurrence of the maximum value of the echo signal (reflected from the defect) recorded in the element,

those 12 memories. The peak detector 6 is reset by the synchronizer signal I, directly on its second input.

Thus, the measurement of the time interval determining the coordinate of the defect occurs in one probing cycle, which improves the monitoring performance and the accuracy of determining the coordinates of the defects.

The memory element 7 records the amplitude of the echo signal in an odd clock, the memory element 11 records the even clock of the synchronizer.

The proposed device allows to reduce the measurement time of the time interval, as well as to improve the measurement accuracy.

Claims (1)

Invention Formula Ultrasonic device for quality control of materials, containing a synchronously connected synchronizer, probe pulse generator, receiving-transmitting transducer, amplifier, analog switch, peak detector, sequential Editor O. Bugir Order 613/32 Compiled by A. Elkin Tehred A. Kravchuk Proofreader S.Sh Circulation 777 Subscription  .VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production printing enterprise, Uzhgorod, st. Project, 4 fO 20 a delay element, the input of which is connected to the synchronizer output, and a gating pulse shaper and a time interval meter, characterized in that, for the purpose of performance monitoring and accuracy of determining the coordinates of defects, it is equipped with two electrical circuits the comparator and the AND element, the trigger and the OR element, the first inputs of the memory elements are combined and connected to the peak detector output, the synchronizer output is connected to The first input of the time interval meter, to the second input of the peak detector and the trigger input, the outputs of which are connected to the second inputs of the memory elements and the second inputs of the I elements, the outputs connected to the inputs of the SHSh element connected to the second input of the meter -25 time intervals, and the output of the gating pulse generator is connected to the second input of the analog switch. Proofreader S. Shekmar