A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Several meters working on the Doppler principle were tested. The Doppler meters depend on reflections from particles or bubbles in the fluid to measure velocity. Although they were linear, they were too inaccurate and inconsistent. Two meters working on the transit time principle were tested and worked very well. These meters measure upstream and downstream transit times for signal reflections from the inner pipe surfaces. However this type of meter is available at present only for permanent installations, not as a survey meter. Finally, the currently used Hall meters were calibrated and recommendations were made as to their proper use. The report recommends that an effort be made to develop a transit time meter in a portable configuration for irrigation survey work. 14 figs., 5 tabs. (ERA citation 13:036644)
Several meters working on the Doppler principle were tested. The Doppler meters depend on reflections from particles or bubbles in the fluid to measure velocity. Although they were linear, they were too inaccurate and inconsistent. Two meters working on the transit time principle were tested and worked very well. These meters measure upstream and downstream transit times for signal reflections from the inner pipe surfaces. However this type of meter is available at present only for permanent installations, not as a survey meter. Finally, the currently used Hall meters were calibrated and recommendations were made as to their proper use. The report recommends that an effort be made to develop a transit time meter in a portable configuration for irrigation survey work. 14 figs., 5 tabs. (ERA citation 13:036644)
Calibration of Irrigation Flow Meters
W. L. Trimmer (author)
1988
50 pages
Report
No indication
English
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