SU1146558A1 - Method of measuring longitudinal and transverse distribution rate of sound waves in flat articles - Google Patents

Abstract

A METHOD FOR MEASURING THE SPEEDS OF SPREADING OF LONGITUDINAL AND TRANSVERSE SOUND WAVES OF BELT PRODUCTS, which consists in emitting a longitudinal sound wave normally to the surface of the product and receiving the sound waves transmitted through the product, in that, in order to expand its functional capabilities, the device will receive a sound wave transmitted from the product, in order to expand its functional capabilities, the device will receive the sound waves transmitted by the product, in order to expand its functional capabilities, the device will receive a sound wave transmitted by the product, in order to expand its functional capabilities, you will receive a sound wave that is transmitted through the product in order to expand its functional capabilities. immersion liquid, simultaneously with the first longitudinal sound wave, emit in the direction parallel to it a second longitudinal sound wave through a liquid by an emitter located on one th forward with the emitter of the first longitudinal sound wave receiving successively two receivers coaxial with the emitters and arranged on a straight, once the product has passed through .zvukovuyu longitudinal wave. a transverse sound wave passing through the product once, a longitudinal sound wave passing through the product twice and once (O longitudinal sound wave passing through the liquid, and measuring the time intervals between the received signals, which, taking into account known dependencies and the velocity of the longitudinal wave in the liquid, are determined The required meters and the thickness of the product are used 05 following 00

Description

 I The invention relates to a measurement technique and can be used in measuring the propagation velocities of elastic waves in materials. A known method for measuring the propagation speeds of longitudinal and transverse sound waves in flat products consists in emitting a longitudinal sound wave normally to the surface of the product and receiving sound waves transmitted through the product p1. The disadvantage of this method is narrow functionality. The purpose of the invention is to expand the functionality. This goal is achieved by the fact that according to the method of measuring the propagation speeds of longitudinal and transverse sound waves in flat products, consisting in the emission of longitudinal sound waves (the waves are normal to the surface of the product and the ultrasound waves transmitted through the product are received, the product is placed in a bath with immersion liquid, simultaneously with the first longitudinal sound wave, a second longitudinal sound wave is emitted in parallel to the direction of the sound wave through the liquid by the radiator located on the same straight line with the radiator the first longitudinal sound wave is received in succession by two receivers coaxial with radiators and placed on one straight, longitudinal sound wave passed through the product, once a transverse sound wave passed through the product, twice a longitudinal sound wave passed through the product and once through a liquid longitudinal sound wave, and measure the time intervals between the received signals by which, taking into account the known, dependencies and speed of propagation of the longitudinal sound The waves in the fluid determine the desired parameters and the thickness of the product. Fig. 1 shows a device for implementing a method for measuring the propagation speeds of longitudinal and transverse sonic: waves in flat products {in Fig. 2 is a time diagram. 8 A device implementing the method contains a bath with an immersion liquid (not indicated) in which product 1 is placed, two radiators 2 and 3 connected to the generator output and located on one straight product 1, whose surface is parallel to the radiating planes of the radiators 2 and 3, two receivers and 5, coaxial-emitters 2 and 3, and placed on one straight, serially connected amplifier, connected to the outputs of receivers 4 and 5, and a recording device (not shown). A device that implements the proposed method works as follows. The generator causes radiators 2 and 3, which emit longitudinal sound waves. The sound wave from the emitter 2 falls normally on the surface of the product. Receivers 4 and 5 receive successively a longitudinal sound wave passing through product 1 (figure 2, signal I), a transverse sound wave passing through product 1 once (figure 2, signal II), twice passing through product 1 longitudinal sound through a wave (FIG. .2 ,, signal III) and a longitudinal sound wave passing once through a liquid (figure 2, signal IV). The recording device measures time intervals between received signals (between signals II and I, between signals III and II, and between signals IV and III), n6 which, taking into account known dependencies and speed of propagation of longitudinal sound waves in a liquid, determine the speed of propagation of longitudinal waves , transverse sound waves in flat products and the thickness of the product according to the formulas 3Colt ,,) Се. + s / U,) H, - V2Co (t ,, b Cg is the speed of propagation of a longitudinal sound wave in a liquid; 311465 C is the speed distributed by the interfacial and transverse sound waves in the material i5 t is the time interval between signals corresponding to one-time production through the product of transverse and longitudinal waves; tn. is the time interval between the signals corresponding to the double-time production through the product of a longitudinal sound wave and one-time study through the P9 transverse sound wave; the time interval between the signals , Sootvetstvuyuprshi to single proho Deniyu fluid through a longitudinal sound wave and the double passage through the article longitudinal acoustic wave. E ionalnye method allows the possibility

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Claims (1)

METHOD FOR MEASURING SPEEDS OF LONGITUDINAL AND TRANSVERSE SOUND WAVES IN PLANE PRODUCTS, which consists in emitting a longitudinal sound wave normal to the surface of the product and receiving sound waves transmitted through the product, characterized in that, in order to expand its functional capabilities, the product is placed in a bathtub with it , simultaneously with the first longitudinal sound wave, a second longitudinal sound wave is emitted in a parallel direction through the liquid by an emitter located on one straight with the emitter of the first longitudinal sound wave, are received sequentially by two receivers, coaxial with the emitters and placed on the same straight line, the longitudinal sound wave passing through the product once, the transverse sound wave passing through the product once, the longitudinal sound wave passing through the product twice and the longitudinal wave passing through the product once sound wave, and measure the time intervals between the received signals, according to which, taking into account the known dependencies and the propagation velocity of the longitudinal th wave in the liquid determine the desired parameters and thickness of the product. □ 5 words 1 1146558