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- W4254334951 abstract "A microcomputer-based ultrasonic gas flowmeter with transit-time method is presented. Modules of the flowmeter are designed systematically, including the acoustic path arrangement, ultrasound emission and reception module, transit-time measurement module, the software and so on. Four 200 kHz transducers forming two acoustic paths are used to send and receive ultrasound simultaneously. The synchronization of the transducers can eliminate the influence caused by the inherent switch time in simple chord flowmeter. The distribution of the acoustic paths on the mechanical apparatus follows the Tailored integration, which could reduce the inherent error by 2–3% compared with the Gaussian integration commonly used in the ultrasonic flowmeter now. This work also develops timing modules to determine the flight time of the acoustic signal. The timing mechanism is different from the traditional method. The timing circuit here adopts high capability chip TDC-GP2, with the typical resolution of 50 ps. The software of Labview is used to receive data from the circuit and calculate the gas flow value. Finally, the two paths flowmeter has been calibrated and validated on the test facilities for air flow in Shaanxi Institute of Measurement & Testing." @default.
- W4254334951 created "2022-05-12" @default.
- W4254334951 date "1972-07-01" @default.
- W4254334951 modified "2023-10-14" @default.
- W4254334951 title "Measured discrimination of boundary-layer pressure fluctuations by round, square and rectangular transducers" @default.
- W4254334951 doi "https://doi.org/10.1016/0041-624x(72)90381-2" @default.
- W4254334951 hasPublicationYear "1972" @default.
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