SU1097936A1 - Ultrasonic device for material quality control - Google Patents

Abstract

ULTRASONIC DEVICE FOR CONTROL. MATERIAL QUALITY, containing a series-connected synchronizer, a probe pulse generator, a radiating converter, a receiving amplifier amplifier, a first threshold stage and a time interval meter, the second input of which is connected to the synchronizer output, a voltage generator connected to the second amplifier input, and a control unit characterized in that, in order to increase the reliability of the control, the control unit is made of serially connected pulse generator, the connected input ohm with the output of the first threshold stage, the analog key, the memory element, the second threshold stage and the second pulse generator, the first output of which is connected to the third input of the time interval meter, and the second output - with (L input of the voltage generator. cf s)

Description

This invention relates to a technique for the testing of materials and products using ultrasound.

An ultrasonic device for quality control of materials is known, which contains a series-connected synchronizer, a probe pulse generator, an emitting transducer, a receiving transducer, an amplifier, a threshold stage, a pulse shaper, and a time interval meter, the second input of which is connected to the output of the synchronizer Cl3.

A disadvantage of the known device lies in the low reliability of the control associated with the dependence of the measurement results on the amplitude of the probe pulses.

The closest to the invention in technical essence and the achieved result is an ultrasound device for controlling the quality of materials, containing a series-connected synchronizer, probe pulse generator, radiating transducer, receiving transducer, amplifier, first threshold stage, and time interval meter, the second input of which is connected to the synchronizer output, a voltage generator connected to the second input of the amplifier, and a control unit 23.

The disadvantage of this device is also in the low accuracy of the control associated with the change in the gain of the amplifier during the measurement.

The purpose of the invention is to increase the reliability of the control.

The goal is achieved by the fact that in an ultrasound device for controlling the quality of materials containing a synchronously connected synchronizer, a probe pulse generator, a radiating transducer, a receiving transducer, an amplifier, a first threshold stage and a time interval meter, the second input of which is connected to the synchronizer output, a voltage generator, connected to the second input of the amplifier, and the control unit of the latter is made of a series-connected pulse former connected You are a first input of a first threshold swing cascade analog key memory element, and the second threshold stage vtorog pulse shaper, a first output connected to the third input meter intervals, the second output - with an input voltage generator.

The drawing shows a structural diagram of the proposed device for quality control of materials.

The device contains the following but connected synchronizer 1, probe pulse generator 2, radiating transducer 3, receiving transducer 4, amplifier 5, first threshold cascade-6 and time interval meter 7, voltage generator 8, control unit 9, connected in series connected pulse shaper 10 analog key 11, memory element 12, second threshold stage 13, and second driver 14 pulses.

The device works in the following way.

5-Synchronizer 1 starts the generator 2 probe pulses, providing excitation in the radiating transducer 3 pulses of ultrasonic vibrations. The impulses of ultrasonic oscillations passed through the controlled product 15 are sensed by the receiving transducer 4 and from its output are fed to the input of the amplifier, to the second input of which is applied changing according to a predetermined

law, the voltage smoothly regulating its gain.

The first threshold stage 6, triggered at a low level, generates pulses that feed to the input.

0 Stop the meter 7 time intervals, to the input of the Start of which pulses are output from the synchronizer output.

From the output of the first threshold stage 5 and the pulses also arrive at the start of the driver 10 pulses of the control unit 9. The shaper 10 produces pulses of a duration longer than the first half period,

0 but less than the duration of the first period of the received signal. When this condition is fulfilled, the analog key 11 passes the output of the first half-cycle of ultrasonic oscillations to the SRI, the voltage amplitude of which is memorized by the element 12 Ps1m a: and, and from its output is fed to the input of the second threshold cascade 13;

The trigger threshold of the second threshold stage 13 determines the required level of amplitude of the first half-cycle of pulses at the output of amplifier 5, at which counting and indication in the meter 7 of ultrasound propagation time in the controlled product should be performed. It is chosen by the obviously large threshold of operation of the first threshold stage 6. In the original condition the coefficient

0 amp gain 5 is max. In this case, the threshold stage 13 is maintained in the on state by voltage from the output of the memory element 12. As the gain of the amplifier amplitude 5 decreases, the amplitude

the signal on, its output decreases, which causes the threshold stage 13 to be turned off. A voltage drop from its output triggers the pulse shaper 14. The pulses produced by shaper 14 are reset by the meter 7 time intervals and affect the control input of the generator 8, after which the gain factor of the amplifier is stabilized, the time meter ultrasound is measured at the normalized amplitude of the first

entry Upon returning the mold 14 to the initial state, the voltage generator 8 is initialized. The gain of amplifier 5 becomes

maximum, and the device returns to its original state.

Automatically setting the normalized amplitude of the first entry of the ultrasonic pulse

at the output of amplifier 5 and stabilization of the gain factor of the amplifier for the measurement time increases the reliability of control.

Claims (1)

ULTRASONIC DEVICE FOR CONTROL. QUALITY OF MATERIALS, which contains a serially connected synchronizer, a probe generator (manual pulses, an emitting transducer, a receiving transducer amplifier, a first threshold stage and a time interval meter, the second input of which is connected to the synchronizer output, a voltage generator connected to the second input of the amplifier, and control unit, characterized in that, in order to increase the reliability of control, the control unit is made of series-connected pulse shaper connected by input to an output of a first threshold stage, an analog key, a memory element, a second threshold stage and a second pulse shaper, the first output of which is connected to the third input of the time interval meter, and the second output is connected to the input of a voltage generator.