FIELD: metrology.
SUBSTANCE: method for measuring the coefficient of sound reflection from a material sample consists in irradiating the sample with a traveling spherical sound wave, registering an interference signal, irradiating sound wave and sound wave reflected by the sample by a receiver, changing the frequency of the irradiating signal, determining the reflection coefficient by the maximum and minimum of the recorded interference signal. The reference direction of incidence of a flat sound wave on the sample is set, based on the location of an emitter, the receiver and the sample under study in the experiment, an interval of change in the frequency of the irradiating signal necessary for observing the maximum and minimum of the interference signal is set; based on the size of the sample and the interval of change in the frequency of the irradiating signal, a step value, a number of elements and coordinates of nodes of a flat lattice oriented along the normal to a given reference direction are determined; keeping the position of the emitter unchanged, the receiver is sequentially installed in lattice nodes, for each position of the receiver, the sample is irradiated with a sound wave in the frequency range that covers the set interval of the frequency change, and signals of interference, irradiating sound wave and sound wave reflected by the sample are recorded by the receiver, weighted summation of interference signals registered by the receiver is performed and a total signal uΣ(ƒ) is obtained, characterizing the interference of flat traveling sound wave and sound wave reflected by the sample incident on the sample; the reflection coefficient is determined by the maximum and minimum of the total interference signal uΣ(ƒ).
EFFECT: increase in the accuracy of measurements.
1 cl, 6 dwg
