Abstract
This paper reports the investigations of the transient flow rate of the several flow meters and the ultrasonic flowmeter based on the pulsed Doppler method. The reference flow rate is given by the gravimetric method which is newly established in NMIJ. The flow rates are investigated for pulsation flow with 0.5 Hz – 8 Hz frequency. The fluctuations of flow rate by ultrasonic pulsed Doppler method and Coriolis flowmeter are agreed well each other and with the reference flow rate. The influence of the fluctuation of flow rate is less than 2% for the pulsed Doppler method. The result gives new advantage, which is high response for transient flow, for the ultrasonic flowmeter based on the pulsed Doppler method.
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