SU597925A1 - Ultrasonic pulsed thickness meter - Google Patents

Description

one

This invention relates to a congruent technique and can be used for the ultrasonic measurement of the topsheet products 83 of various materials.

Known. ultrasonic pulse thickness gauges containing a synchronizer, a generator, a split-combined searcher, an amplifier, a fi ut uti4Kgel sensor, a counter, synchronizer pulses, a measuring circuit whose principle of operation is based on measuring the time interval between the cHHpOHKf pulse and the reflected pulse. However, such thickness gauges have low accuracy when measuring small thicknesses.

The closest technical solution to the present invention is ultrasound (a hot pulsed thickness gauge containing a piezo transducer; a measurement cycle time reference, to the output

which are connected in parallel with the installation unit zero, the driver of the time interval, the reflection pulse selector and the driver of the probe pulses, the output of which is connected to the transducer

The output of the reflection pulse selector is connected to the second time interoperator, the output of the time interval generator is connected to the first input of the coincidence circuit, to the second of which the reference pulse generator is connected, and the output of the coincidence circuit is connected to the counter pulses, in the upstream input is connected to the output of the zero setting unit.

The principle of operation of the device is based on measuring the time interval proportional to the parameter being measured (thickness) with the help of a standard pulse generator and pulse counter q2 A disadvantage of the known device is that when changing the thickness of the measured thicknesses it is necessary to significantly change the frequency of the following standard pulses which limits the use of the known device, as well as the presence of systematic error caused by the signal delay in the forgator circuit and the pulse of pulses and in the selector from Agen pulses.

The circuit of the invention of bcc extends the range of controlled products and increases the accuracy of measurements.

For this, the thickness gauge is provided with an additional counter, the first input of which is connected to the reflector selector selector, the second to the zero setting blush, and the output to the shaper of time intervals, while the output of the reflected pulse selector is connected to the second input of the probe pulse former.

In order to increase the measurement accuracy, the Ton gage is equipped with a time base circuit, the input of which (connected to the measurement cycle time generator, and the output to the (time interval former,

The drawing shows the block diagram of the ultrasonic pulse thickness gauge,

. The device contains a probe pulse shaper 1, a piezo transducer 2, a reflected pulse selector 3, a pulse counter 4, a shaper shaper 5, a time delay circuit 6, a coincidence circuit 7, a generator of reference pulses 8, a reference pulse counter 9 with a display device, block 10 set zero, setting unit 11 of the measurement cycle time.

The device works as follows

The pulse of the setting unit 11 of the measurement cycle time through the zero-setting unit 10 resets the counters 4 and 9 to the zero position, starts the shaper 1 of the probe pulses, which excites the piezoelectric transducer 2, prevents the probe pulse through the selector 3 of the reflected pulses, and through the circuit 6, the delay time includes shaper 5 time intervals,

ensuring that the ita input of the counter 9 reference reference pulses from the generator 8 reference pulses passes through the circuit 7.

Ultrasonic vibrations reflected from the opposite face of the product are converted into electrical pulses, which through the reflected pulse selector 3 are fed to the second trigger input of the probing pulse former 1 and to the input of counter 4, Poile filling the counter 4 with these pulses, the driver 5 of the time intervals is closed, and the count

reference reference pulses are terminated with the arrival of a pulse from the setpoint generator 11, the measurement measurements,

Thus, the introduction of an additional counter allows the range of monitored products to be expanded without changing the pulse repetition rate, and the introduction of a time delay circuit improves measurement accuracy.

Claims (2)

1. Ultrasonic pulse thickness gauge containing a piezo-transducer, a unit for setting the time of the measurement cycle, the output of which is connected in parallel with the zero setting unit, the selector of reflected them. Pulses "shaper of probe pulses, the output of which is connected to a Psezopre generator, and to the second input of the selector of reflected pulses, connected in series with Ovpadadesh and a counter, as well as connected in parallel to the shaper of a time interval and generator of reference pulses, whose outputs are connected to different inputs of the coincidence circuit and the output of the unit ustan | in JSH zero is connected to the second input of the counter, i characterized by the fact that, in order to expand the range of controlled products, it is equipped with an additional counter com, the first input of which is connected to the selector of reflected pulses, the second - to the zero setting block, and the output to the time interval shaper, while the output of the reflected pulse selector is connected to the second input of the probe pulse shaper. 2. A thickness gauge according to claim 1, about tl and h ayush and. so that, in order to improve the accuracy of measurements, it is equipped with a time delay circuit, the input of which is connected to the unit of time of the measurement cycle, and the input to the driver of the time intervals. Sources of information taken into account in the examination; 1. Author's certificate № 326509, class, Q 01 N 29/04, 1970. 2, Accepted UK application No. 1323079, C 9/66, 1973.