SU634198A1 - Ultrasonic device for material quality control - Google Patents

Description

Consequently, the synchronized 8, the first block of anti-splices 9, the delay stage 10, and the sweep generator 11, the output of which is connected to the second input of the block 9, the retium input of which is connected to the output of the delay cascade; the second block 12 coincidences, the first input of which is connected to the output of block 9, the second input to the output of block 5, and the output to the second inputs of the selector 4 and counter 6; electron beam tube 13, connected between the outputs of the block 3 and the generator 11 sweep; a cascade of coincidence 14, connected between the output of the counter and the input of the digital indicator and connected to the third output of the control unit, and the recorder 15, connected between the outputs of the counter and the control unit. The input of the probe pulse generator is connected to the output of the anti-coincidence unit 9.

The device works as follows. The generator 1 of the probe pulses using n & transducer 2 excites elastic oscillations in the sample under study, which, reflecting from the faces of it, are received again by the transducer, converted into electrical impulses and amplified in the receiving unit 3.

The pulses from the output of the receiving unit are fed to the input of the selector 4, which selects two signals characterizing the speed and attenuation of ultrasonic vibrations. These signals are received by the control unit 5, which produces an electrical impulse, the duration of which characterizes the propagation velocity or the attenuation of ultrasound. In the counter b, the counting of pulses takes place, followed by an indication of their number on the indicator 7.

The indication time is determined by the corresponding time interval that block 5 produces and which is prohibiting for cascade 14 matches.

Timing pulses to start generator 1 and. sweep generator 11 are generated as follows:

In the initial state, the anti-coincidence unit 9 in the absence of a counting pulse from the generator 11 and a sweep delay pulse from the Skier stage 10 is open and the synchronization pulse from the synchronizer 8 passes to the start of the delay stage, the pulse of which starts the generator 11.

Consequently, the pulse repetition frequency of the starting pulses of the generator 1 and the sweep generator 11 is determined by the total duration of the sweep and the delay of the sweep, since the pulses of these blocks are prohibitive for block 9 anti-coincidence,

The pulses for starting the selector 4 and the counter 6 are generated as follows.

The impulse from the anti-coincidence unit 9 is supplied to the anti-coincidence unit 12, for which the impulse IMPULSE is the impulse from unit 5. Therefore, at any pulse frequency from unit 9, units 4.6 will not start until the measurement process is completed.

A set of blocks is indicated which ensures an increase in labor productivity due to the fact that the start of the probe pulse generator is carried out from the output of the anti-coincidence unit 9 and, therefore, the start frequency of the generator 1 does not depend on the measurement time. Due to the fact that the recorder is connected directly to the output of the counter, the registration of measurement results does not depend on the indication time, which also improves the performance of the control.

Claims (1)

1. Technical description of the device US-114, the manufacturer. Electrotochpribor, Chisinau, 1976. 2, USSR Author's Certificate No. 539268, cl. G01 N 29/04, 1975.