SU601609A1 - Device for measuring ultrasound propagation velocity in moving sheet material - Google Patents

Description

As a result of dry friction between the spherical orifice bodies 1 and the moving sheet material, a noise-like signal is generated in the latter.

This signal is distributed along the sheet plane and is partially emitted into the air.

A noise-like ultrasonic signal in air is received by receivers. At the output of the heat exchanger 6, a signal is delayed relative to the signal at the output of the I 4 by 4 (a time interval equal to the propagation time of the oscillations along the sheet material in the longitudinal direction, and the output of the receiver 5, respectively, in the transverse direction.

To determine the propagation velocity of ultrasonic oscillations, in the longitudinal direction "a switch 7 sends a control signal so that the electrical signal from the output 1 of the receiver 6 is connected to one input of the correlometer 8, to the other input of the correlometer the signal received at the output of the receiver 4, and By this signal: m is calculated by the mutual correlation function. At ET01M, the signal from receiver 4 in the correlometer 8 is delayed relative to the signal from receiver 6 by the time at which the maximum of the mutual correlation function is obtained. Then the delay time T is equal to the propagation time of the ultrasound | razvuko; output oscillations on the sheet material in the longitudinal direction between 0: battle receivers.

The time interval T is supplied to a functional converter 9, which converts the interval T to a function - and this

the function is multiplied by the length of the distance LI.

The original result V - is given in

1 in digital form in the recorder 10.

To measure the rate of propagation of ultrasonic vibrations in the transverse direction of the sheet, a switch 7 is fed a directing signal so that the signal from the output of receiver 5 is connected to one input of the correlometer 8.

Further, the measurement circuit operates as in measuring the propagation velocity of ultrasonic vibrations in the longitudinal direction of the sheet.

The invention makes it possible to desaturate a continuous measurement of the velocity of propagation of acoustic oscillations in the sheet material in the transverse and longitudinal directions of the sheet with high accuracy and reliability.

Formula 3 about ip e iH and

An apparatus for measuring the velocity of propagation of ultrasound in a moving sheet material, comprising a radiator and

Receiver, the axis of which is perpendicular to the direction of movement of the material, the support roller, located under the receiver, functional preO: b (disperser and recorder connected to the output of the converter,

characterized in that, in order to increase measurement reliability, it is equipped with a second and third receivers, a switch whose inputs are connected to the first and third receivers, a correlometer, the first KOTOiporo input is connected to the switch, the second input is connected to the second receiver, and a functional converter, the input of which is connected to the switch, the radiator is made in the form of a stationary body and is installed under the second receiver.

Sources of information taken into account in the examination:

1. Copyright certificate in the USSR № 32373-8, cl. G 01 N 33/34, 1970.

2. For the number 21589.35, cl. G 01 N 29/04, 1975, according to which a positive decision was taken to issue an author's certificate.

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