SU1213348A1 - Ultrasonic thickness gauge - Google Patents

Description

 21: i

Iaoborepipa refers to the measuring tech: to her, and to the non-destructive itrol 10 products with one-sided access to the pk surface.

The purpose of the invention is to improve the accuracy of measurement

The drawing shows the structure of the ultrasonic sensor circuit.

The thickness gauge contains a control unit 1, a generator 2 probeprupples1;: x x pulses, ultrasonic transducers 3 n 4, multiplexer 5, amplifier 6, shaper 7 inter-time, demultiplexer 3 reversible counter 9, counter iO and generator 11 of counting pulses. Ultrasonic transducer 3 is made so that M3 is balanced and ultrasonic receiving transducer 4 is tuned to receive the surface ;: waves The control unit 1 is connected by a nepBFjLM output to the control input, the generator 2, of the impulses, which are connected to the input and the ultrasonic a 3-and 7-formaker transducer over the intervals, and an output once a two-way combined transducer, 3 subframes, sequentially connected to the multiplexer 55 whose second input is connected to the output of an ultrasonic when many preobt) 4 azovatel surface zo, lN5 amplifier b, builder slots 7 and DeMouy, 8. t1tipleksoru first vp;: od which poddslk chen to .In 1ruYu; ene entry reversible counter 9 vmitayu 7y in :; It is connected to the input of the counter 10 and is equipped with a remote control 8,

The generator 11 of the counting and 1-1 pulses is connected to an input, a 2-down counter 9 5 VE-soda which is connected to / to the input of the unit 1 ut, equal to 1 and the second output of the latter is connected to the control inputs of the multiplexer 5 to multiplexer 9,

That, lsh, the inomer works the next time.

Before the first cycle is measured, the signal from the block I ulu; the alenil arrives at the control inputs of the multiplexer 5 and the demultiplexer 8, as a result, the multiplexer 5 connects the code of the co-ed ultrasound

five

0

five

0

five

348

the distributor 3 with the inputs of the amplifier 6, and the demultiplex, t1exor 8 - the output of the driver 7 time intervals with the sum of the FP1-1-1 input of the reversing counter 9, then the control unit 1

L-10

... -... Raz; where b is the distance between

converters 3 and 4; d - a non-positive positive number 5 which determines the accuracy of the measurement, triggers a generator 2 of probing 1 mp 5, which the same time excites the combined ultrasonic transducer 3. Transducer 3 emits ultrasonic waves into the product. A longitudinal wave pulse, reflected from the opposite surface of the product, is returned to the 3 tf transducer to be transformed into an electrical one: - a bulk, which, through a multi-n, iieKcop 5; enters the input of amplifier 6.

The pulse of the generator 2 simultaneously with the excitation of the converter 3 sets the output signal of the generator 7 with a high level. The signal from the output of amplifier b returns the shaper of 7 time intervals to the initial state, i.e. a low-level signal is set at its output in the following manner; a shaper of 7 time intervals during the first measurement step of the thickness of the cut L -10 is -... pulse duration

bone 5 is equal to the transit time of the ultrasonic pulse through the thickness of the product.

These IT-guides, passing through the demultiplexer 8j, are fed to the sum-reversing reversing counter 9, which measures the duration of the number and is pulsed using the generator pulses 1 of the counting pulses and the summation 1-cycle, the measurement parts,

At the beginning of the second measurement cycle, the sigpa, n from control unit 1, switches on thu, pitip, pexor 5 and demultiplexer 8: input of amplifier 6 connects with ultrasonic receiving converter 4, and output of shaper 7 connection time intervals (; It is equipped with the counter input 9 and the counter input 10. After the switching in the multiplexer 5 and the de-multiplexer 8, the control unit 1 starts to run periodically

2 probe pulse generator, which is triggered by the combined ultrasonic transducer 3..

The surface wave impulse from transducer 3 reaches the ultrasound transducer 4 and is converted into an electrical signal. This signal passed through the multiplexer 5 and amplified by the amplifier 6, is fed to the shaper 7 time intervals. In the same way as described above, the shaper 7 receives a signal from the generator 2 of the probe pulses at the time of excitation of the converter 3. Then the shaper 7 of the time intervals triggers a pulse at each excitation of the combined ultrasound L. Kondrykinsky

Editor V. Petrash Tehred A. Babinets

Order 774/51 Circulation 671 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 1 13035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

1,1348

the second transducer 3 in the second measurement cycle. These pulses pass through the demultiplexer 8 to the subtracting input of the counter 9. 5 The formation of the pulses is repeated until the zero state is reached in the reversing counter 9. At the same time, the number of these shafts formed in the second measurement cycle 10 is counted by the counter 10. The contents of the counter 10 are the result of the measurement and determine the thickness of the item being monitored.

15 When the zero state is reached, the reversible counter 9 generates a signal that informs the control unit 1 about the end of the second thickness measurement cycle.

Proofreader M. Demchik

Claims (1)

ULTRASONIC THICKNESS THERMOMETER, comprising a series-connected probe pulse generator and a combined ultrasonic transducer, a receiving ultrasonic surface wave transducer, a series-connected amplifier and a time interval shaper, the second input of which is connected to the output of the probe pulses, and a counting pulse generator, characterized in that, for the purpose of to increase the accuracy of measurement, it is equipped with a reversible counter, to the input of which a counter pulse generator is connected , a counter, a multiplexer, the inputs of which are connected to the outputs of the ultrasonic transducers, and the output is connected to the input of the amplifier, a demultiplexer connected to the output of the shaper of the time intervals, and the first output is to the summing input of the reverse counter, the subtracting input of which is connected to the input of the counter and the second demultiplexer output, and a control unit, the first output of which is connected to the control input of the probe pulse generator, the second output - with the control inputs of the multiplexer and demultiplex a and input - with the output of the reversible counter. > '213348