SU753271A1

SU753271A1 - Device for measuring speed of ultrasound

Info

Publication number: SU753271A1
Application number: SU782679739A
Authority: SU
Inventors: А.Г. Сейлюс; А.Г. Зиманас
Original assignee: Вильнюсский Инженерно-Строительный Институт
Priority date: 1978-10-12
Filing date: 1978-10-12
Publication date: 1981-09-07

Description

1one

Изобретение относитс к области неразрушающих испытаний ультразвуковым методом и может быть использовано дл измерени скорости ультразвука .The invention relates to the field of non-destructive testing by an ultrasonic method and can be used to measure the speed of ultrasound.

Известен измеритель скорости ультразвука , содержащий генератор импульсов , формирующий каскад, усилитель, детектор и частотомер 1.Known speed meter ultrasound, containing a pulse generator, forming a cascade, amplifier, detector and frequency meter 1.

Недостатком известного устройства вл етс низка точность измерений.A disadvantage of the known device is the low measurement accuracy.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс устройство дл измерени скорости ультразвука, содержащее последоварельно соединенные генератор зондирующих импульсов, модул тор, излучающий преобразователь , приемный преобразователь, усилитель и детектор 2 .The closest to the invention in technical essence and the achieved result is a device for measuring the speed of ultrasound, containing a series connected probe pulse generator, modulator, radiating transducer, receiving transducer, amplifier and detector 2.

Недостатком известного устройства вл етс низка точность измерений ввиду того, что косвенно приходитс измер ть врем распространени ультразвука .A disadvantage of the known device is the low measurement accuracy due to the fact that it is indirectly necessary to measure the propagation time of ultrasound.

Цель изобретени - повьииение точности измерений.The purpose of the invention is to increase the measurement accuracy.

Это достигаетс тем, что предлагаемое устройство снабжено селектором , включенным между модул тором и This is achieved by the fact that the proposed device is equipped with a selector connected between the modulator and

детектором, блоком измерени толщины и измерителем отношени частот, включенным между блоком измерени толщины и селектором.a detector, a thickness measuring unit and a frequency ratio meter connected between the thickness measuring unit and the selector.

На чертеже представлена блок-схема устройства.The drawing shows the block diagram of the device.

Устройство дл измерени скорости ультразвука содержит последовательно соединенные генератор 1 зондирующих A device for measuring the speed of ultrasound contains a series connected probe generator 1

10 импульсов, модул тор 2, излучающий преобразователь 3, приемный преобразователь 4, усилитель 5, детектор 6, селектор 7, выход которого подключен к входу модул тора 2. Выход селекто15 ра соединен с первым входом блока 8 отношени частот, второй вход которого соединен с выходом блока 9 измерени толщины.10 pulses, modulator 2, radiating converter 3, receiving converter 4, amplifier 5, detector 6, selector 7, the output of which is connected to the input of modulator 2. The output of the selector is connected to the first input of the frequency ratio unit 8, the second input of which is connected to the output of the thickness measuring unit 9.

Устройство работает следуквдим об20 разом.The device works on the same time.

Claims

The high-frequency oscillations produced by the generator 1, the frequency of which corresponds to the resonant frequency of the transducers 3 and 4, go to the modulator 2 and then to the radiating transducer 3, which is in direct contact with the controlled product 10. The ultrasonic waves that pass through the controlled product go to the receiving transducer 4, is converted into an electrical signal, which is amplified by a wideband amplifier 5, and transmitted to an amplitude modulated oscillation detector 6. From the output of the detector 6, the signal through the selector 7 enters the modulator 2 and again to the transducer 3. The frequency of the self-excited low-frequency oscillations f is determined by the speed of propagation of ultrasonic waves. C in the product and the thickness of the product 6 f e The unit 9 for measuring the thickness of the product generates a signal whose frequency f is inversely proportional to the thickness of the product 6f a T where a is the proportionality factor. Thus, the described invention makes it possible to measure the propagation velocity of ultrasound with high accuracy. An apparatus for measuring the speed of ultrasound, comprising a series-connected probe pulse generator, a modulator, a radiating transducer, a receiving transducer, an amplifier and a detector, characterized in that, in order to improve the measurement accuracy, it is equipped with a selector connected between the modulator and the detector, a thickness measuring unit and a frequency ratio meter connected between the thickness measuring unit and the selector. Sources of information taken into account in the examination 1. V. Nosov. Designing ultrasonic measuring equipment. M., Mechanical Engineering, 1972, p. 99

2. USSR author's certificate number 391466, cl. G 01 N 29/00, 1973 (prototype).