| 摘要 |
FIELD: physics, measuring. ^ SUBSTANCE: for determination of the rate of flux, shape a transmitted ultrasonic signal, synchronised on a phase, in the form of two harmonious components with the frequencies which relation of the total to their difference is multiple to four, and the basic ultrasonic signal, which frequency is set to an equal half-sum of these frequencies. The accepted signal gained after passage in fluid medium between two points, spatially carried in a stream direction, immix in one mixer with a sinus basic signal, and in other mixer - with a cosine basic signal. For each signal conversed in mixers spend a partite filtration on the frequency equal to semidifference of frequencies of two harmonious components, digitisation and transformation of a lumped signal to the numeral shape with reception of readout of the digitisation having an identical phase. Digitisation readout average, then times of passage of each of two ultrasonic signals transmitted in opposite directions, spot on values conversed to the numeral shape of a lumped signal having major amplitude after a filtration. The phase detrusions arising in each ultrasonic signal as a result of passage on a stream, spot under the relation of amplitudes of the signals gained after their partite filtration. ^ EFFECT: increase of measurement accuracy of the rate of flux, cutting of volume of numeral processing. ^ 2 dwg |
