SU447605A1 - Instrument for measuring the attenuation coefficient of ultrasonic waves - Google Patents

Description

(54) DEVICE FOR MEASURING THE DIFFUSION RATIO OF ULTRASONIC WAVES

one

The invention relates to the field of laboratory and production control of the physicomechanical properties of textile materials in the chemical and light industries.

A device for determining the attenuation coefficient of ultrasonic waves in a filament is known, which contains a piezoelectric transducer connected to a pulse generator, two piezo receivers electrically connected by means of amplifiers to a transducer and a recording device.

However, such a device has a low accuracy of measurement due to the disturbance caused by interference phenomena in the sound of a complex textile yarn.

The purpose of this invention is to improve the accuracy of measuring the attenuation coefficient of ultrasound in complex textile yarns.

For this purpose, two signal rationing units are introduced into the proposed device, each of which consists of an electronic key, a diode limiter and a trigger, and.

 a time synchronization circuit, and measurement of indicators is made on the first burst of the ultrasonic signal.

The drawing shows a block diagram of the device. ,

The device consists of a piezoelectric radiator 1 connected to a pulse generator 2, two piezoelectric receivers 3 and 4, electrically connected by means of amplifiers 5 and 6 to conversion and recording devices. The converting device is equipped with two signal-conditioning blocks, each of which consists of an electronic key 7 and 8 and flip-flops 9 and Yu, a time synchronization circuit 11 that is electrically connected to the generator of infrared pulses 2 and the signal normalization blocks, the outputs of which use keys 12 and 13 are connected to the recording device with voltmeters 14 and 15.

The device works as follows.

The time synchronization circuit 11 generates three identical pulses that simultaneously arrive at the probe

a oscillating generator 2, triggers 9, 10, and locking electronic switches 12, 13. The probing generator sends a square-shaped pulse to the piezoelectric emitter 1, which excites ultrasonic oscillations in the filament that propagate both to the left and right of it. Piese, the receiver 3 located at a distance v converts the ultrasonic wave into an electrical signal amplified by the amplifier 5.

The first positive surge napr. ki, passed the diode limiter, acting & on the trigger U, the voltage drop from the trigger closes the electronic key 13, Thus, only the first positive half-cycle of the electric signal, the amplitude of which will be measured, passes through the pulse voltmeter 15.

Similarly, the channel of the second piezo receiver 4,

four

Subject invention

An instrument for measuring the attenuation coefficient of ultrasonic waves, an nahfmer, in textile fibers, containing a piezoelectric emitter connected to a pulse generator, two piezoelectric receivers electrically connected with amplifiers to a converter and recording device Q ;.T.JI and.h u with the fact that, in order to increase the measurement accuracy — caffidi (the attenuation of ultrasound in complex textile yarns; the conversion device is equipped with two signal rationing blocks, each of which consists of an electronic a key, a diode limiter, and a trigger; and a time synchronization circuit electrically connected to the pulse generator and signal normalization units, the outputs of which are connected to the recording device.