FIELD: physics.
SUBSTANCE: several fibres are combed. A given number of samples of given mass and configuration are taken from the fibrous web. A packet of given configuration, size and mass is created by piling the samples. The packet is placed between radiating and receiving acoustic oscillation sensors, with the plane of the packet normal to the direction of propagation of the oscillations. Parametres of the fibres are determined from the value of the transmitted acoustic signal. Initially, the measurement base between the sensors is measured, achieving antinodes or nodes of a standing acoustic wave on the receiving sensor in the absence of a sample in between. A standard packet of fibres is then placed between the sensors and where parametres of the said packet are predetermined using standard methods. By varying the measurement base, antinodes or nodes of the standing wave are obtained on the receiving sensor. The ratio of bases with the standard sample and without a sample is used to determine the coefficient of proportionality. Further, by putting the test sample between the sensors and changing the base, antinodes or nodes of standing waves are obtained at the receiving sensor and parametres of fibres of the test sample are determined from the value of the measurement base multiplied by the coefficient of proportionality.
EFFECT: increased accuracy, objectiveness and efficiency of monitoring average parametres of fibres in a mass in laboratory conditions.
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