半逆位相パルスを用いた超音波時間領域相関法による流速分布計測高度化に関する研究

抄録

This paper presents an application of a novel ultrasonic pulse, half-inversion pulse, to the velocity profile measurement using Ultrasonic Time-Domain Correlation (UTDC) method. UTDC is a type of flow metering method that is applicable to the on-site calibration. The advantages of this method are the possibility of no-limitation of velocity range and applicability to flow fields without enough reflectors. Previous studies reported, however, that UTDC has also a limitation of velocity range because of the false detection. To overcome the false detection, we have developed a new waveform of pulsed ultrasound. Experimental measurements were performed at the national standard calibration facility of water flowrate in Japan. The results indicate that UTDC employing half-inversion pulse can measure velocity profiles and flowrates with higher accuracy than the conventional method.