FIELD: measurement technology. SUBSTANCE: thermal area in form of sinusoidal thermal field is formed in measuring channel; formed thermal area is recorded at fixed distance from axis of flow; direct component of product of signals of thermal fields being formed and recorded is separated; magnitude of flow rate is determined by formula. Device has sinusoidal signal generator 1, thermal sinusoidal field shaper 2, measuring channel 3, recorder 4, first amplitude detector 5 and second amplitude detector 7, multiplier 6, low-pass filter 8, amplifier 9, analog signal dividing unit 10 and computer 11. EFFECT: enhanced accuracy of measurement. 3 cl, 1 dwg
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