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We present an ultrasonic transit-time gas flow meter (UFM) that features a 40-kHz 2D-phased array for transmitting ultrasonic sound waves up- and downstream to two single element receivers. This allows us to electronically compensate for the well-known parasitic sound drift effect, and, thus, increasing the measurement range by improving the signal-to-noise-ratio (SNR). A regular double-path UFM consists...
The arrival time detection probability and the measurement range of transit-time ultrasonic flow meters are undermined by the sound drift effect. One solution to this problem is utilizing a phased-array beam steering technique to compensate the bend of the ultrasonic beams. The design, the fabrication and the characterization of two-dimensional flexural ultrasonic phased arrays is investigated in...
Transit-time ultrasonic flow meters, measuring the time difference between upstream and downstream propagation of ultrasonic beams, have been widely utilized to obtain the average velocity of flow in many applications including natural gas flow rate measurement. The signal-to-noise ratio (SNR) of the ultrasonic signals frequently suffers from the sound drift effect, and thus, the arrival time detection...
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