SU864116A1 - Device for quality control of materials - Google Patents

Description

54) DEVICE TO CONTROL THE QUALITY OF MATERIALS. The invention relates to non-destructive ultrasonic testing and can be used to control the quality of construction objects, etc. A device for controlling the quality of materials is known, which contains a generator of probe pulses, radiations and receiving transducers, an amplifier, a sweep generator and an indicator}. A disadvantage of the known device is low control performance. The closest to the invention to the technical essence and the achieved result is a device for controlling the quality of materials, containing a series-connected synchronizer, probe pulse generator, radiating transducer, receiving transducer, amplifier and cathode-ray tube (CRT), two frequency dividers, a recorder, a sweep generator connected between a synchronizer and a CRT, a sawtooth voltage generator, the output of which is connected to the recorder input, a strobe pulse generator, which input It is connected to the output of the second frequency divider, two mixers, the first inputs of which are connected to the output of the strobe pulse generator, and the outputs are connected to the recorder inputs, the second input of the first mixer is connected to the second output of amplifier 2. A disadvantage of the known device is low monitoring performance. for the loss of time for recording the negative part of the oscillogram of the received signal, as well as the absence of an automatic measurement of the signal propagation time. The purpose of the invention is to increase the productivity of the control. The goal is achieved in that the device is equipped with a key connected between the synchronizer and the first frequency divider, a trigger whose first output is connected to the second key input, and the second output to the second inputs of the sawtooth voltage generator and frequency dividers, a time meter whose first input is connected to the synchronizer output, the second input - to the output of the first frequency divider, the third input to the third output of the amplifier, and the output to the trigger input, and the driver of the labels connected between the synchronizer and the EL T and connected to the second input of the second mixer.

The drawing shows the block diagram of the device.

The device for quality control of materials contains a synchronizer 1 connected in series, a probe pulse generator 2, an emitting transducer 3, a receiving transducer 4, an amplifier 5 and a cathode ray tube (CRT; C, first frequency divider 7, second frequency divider 8, recorder 9-, sweep generator 10 connected between synchronizer 1 and CRT 6, sawtooth voltage generator 11 whose output is connected to the recorder 9, generator 12 whose input is connected to the output of the second frequency divider 8, mixer 13 and 14, the first inputs of which are connected to the output of the generator 12 strobe pulses -, - and the outputs to the inputs of the recorder 9. The second input of the first mixer 13 is connected to the second output of the amplifier b.

In addition, the device contains a key 15 connected between synchronizer 1 and the first frequency divider 7, trigger 16, the first output of which is connected to the second input of the key 15, and the second output to the second inputs of the generator 11 sawtooth voltage and frequency dividers 7 and 8 , time meter 17, the first input of which is connected to the output of synchronizer 1, the second input to the output of the first frequency divider 7, the third input to the third output of amplifier 5, and the output to the input of trigger 16, shaper 18 marks connected between synchronizer 1 and CRT 6 and connect enny to the second input vtorot; of mixer 14, recorder 19, a first input coupled to an output meter 17 times, and the second input - with the output of the first frequency divider 7.

The device works as follows.

Using an external control circuit, for example, a command button to start recording an acoustic signal (not shown in the drawing), the start trigger 16 is brought to a working state. At the inputs of the key 15 and the generator 11 sawtooth voltage from the outputs of the trigger 16 of the start receives the prohibition potential. As a result, zero potentials are set up at the outputs of the switch 15 and the generator 11, which are maintained for the entire period of time when the trigger 16 is in the operating state.

In addition, the output voltage of the start trigger 16 is fed to the inputs of the reset circuits in the zero state of frequency dividers 7 and 8. At the time of installation of the first frequency divider 7, a single pulse is formed at its output, which is fed to the corresponding inputs of time meter 17, time recorder 19, sweep generator 10 and probe pulses generator 2. As a result, the time indicator reads and time measurer 17 begins the countdown of the signal propagation time. The generator 10 generates a voltage sweep of the beam on the screen of the cathode ray tube 9, and the generator 2 probe pulses using the radiating transducer 3 sends into the material of the sounding zone of the product 20 an ultrasonic pulse, which after some time reaches the receiving transducer 4. The pulse transformed by the receiving transducer 4 into the electrical signal, amplified in amplifier 5 and fed to the inputs of the CRT 6, the second input of the first mixer 13 and the third input of the meter 17 of the propagation time acoustic th pulse. As a result, an oscillogram of the received signal modulated on the screen of the received signal by the pulses from the output of the 18-label former, controlled by the output pulses of the synchronizer 1, is displayed on the screen of the CRT 6. the initial surge of the oscillogram, the operator can set the time of signal propagation in the area of the sound of the product, which is necessary, for example, when checking the correctness of the operation of the first time propagation meter first entry acoustic signal. At the time of the signal at the third input of the meter 17, the latter completes the operation of measuring the propagation time of the ultrasonic signal. At the second output of measurer 17, a back end of the pulse is generated, with which the trigger 16 is returned to the initial state. At the same time, the potentials at the output of the trigger 16 are changed in such a way that the key 15 is opened, and the generator 10 of the saw-tooth voltage goes into a working state.

Synchronizer 1 generates an intermittent sequence of electrical pulses with a constant duty cycle. The output pulses of synchronizer 1, after being converted in tag maker 18, are used to measure the propagation time of the ultrasonic signal. The output pulses of the synchronizer1 are constantly fed to the inputs of the marker maker 18, the second frequency divider 8, the key 15 and the first input of the time meter 17. During the working cycle through the meter 17, these pulses enter time peiHCTpaTOp 19, which is a pulse counter with a digital indicator. Therefore, at the time of completion of the operating cycle of the meter 17, a number appears on the digital indicator of the recorder 19, which is the result of measuring the propagation time of the acoustic signal in the area of the sound of the product 20.

The division factors of the first and second dividers 7 and 8 of the frequency are chosen in such a way that, while simultaneously receiving a sequence of pulses from synchronizer 1, the intervals between the pulses at the output of the frequency dividers increase at a constant speed.

The output pulses of the second divider 8 frequency excite the generator 12 strobe pulses. As a result of the operation of generator 12, pulses of standard duration appear at its outputs. At the output of the mixer 14, the signal appears only with the simultaneous appearance of pulses at two inputs. The output signal of the mixer 13 is fed to the input of the pen control channel of the self-recording pen 9, as a result of which the carrier is marked on the media with the pen carriage coordinate at a given time.

The mixer 13 is a gated amplifier that counts the instantaneous amplitudes of the output signal of the amplifier 5 during the duration of the strobe pulse output from the generator 12 of strobe pulses. The output voltage of the mixer 13 is fed to the input of the control channel by the position of the carriage of the recorder pen 9 along the ordinate axis and causes a corresponding movement of the carriage. From the output of the generator 11 abscissa axis. As a result, during the strobe pulse, a mark appears on the recorder tape, the coordinates of which are proportional to the amplitude of the ultrasonic signal at a given time and reference number.

The first count occurs at the time of arrival of the signal at the location of the receiving transducer 4, and each follow-up count is performed at a time away from the previous one by a constant value specified by the ratio of the division factors

the first and second dividers are 7 and 8 frequencies. As a result, an oscillogram of the ultrasonic signal appears on the tape of chart 9, starting from the moment the signal arrives at the receiving point, and the initial non-informative part (zero line of the oscillogram between the moment of sounding and the moment the signal begins to be received is not recorded.

The proposed device allows to increase the performance of the control.

Claims (1)

Invention Formula Quality control device 5 materials containing sequentially connected synchronizer, probe pulse generator, transducer emitter, receiving transducer, amplifier - and electron beam tube (CRT}, two frequency dividers, a recorder, a sweep generator connected between the sync synchronizer and the CRT, sawtooth voltage generator, the output of which pod5 is connected to the recorder input, strobe pulse generator, the output of which is connected to the output of the second frequency divider, two mixers, the first inputs of which are connected to the generator output 0 gates and outputs to the recorder inputs, the second input of the first mixer is connected to the second output of the amplifier, characterized in that, in order to increase the control performance, it is equipped with a key connected between the synchronizer and the first frequency divider, trigger, the first output of which is connected to the second input of the key, and the second output - to the second inputs of the generator 0 sawtooth voltage and frequency dividers, a time meter, the first input of which is connected to the synchronizer output, the second input to the output of the first frequency divider, 5, the third input- to the third output of the amplifier, and the output to the trigger input, and the label driver connected between the synchronizer and the CRT and connected to the second input of the second mixer. I Information sources, taken into account in examination 1, USSR Copyright Certificate five No. 270318, cl. G 01 N 29/04, 1970. 2. USSR author's certificate  600438, cl. G 01 N 29/04, 1978 (prototype).