| 摘要 |
PURPOSE:To simplify the structure of a detector, to facilitate its fitting, and to generate highly reliable data by transducing light incident to two detectors through two pinholes into two sequences of electric signals, finding their correlation and performing arithmetic, and finding the velocity and quantity of fluid. CONSTITUTION:The surface state of fluid having a constant velocity is maintained for a short time, so a detector 1 detects light at points 10 and 11 the fluid surface 8 to obtain voltage waveforms, whose correlation is found by a correlator 9 to find momentary autocorrelation time T1. Similarly, a detector 2 detects light at points 12 and 13 on the surface 8 to find autocorrelation time T2. The surface velocity of the fluid is found from the time data T1 and T2 and the distance between the detectors. Similarly, the distance from pinholes to the fluid surface are found from the distances between the detectors and a slit and the time data T1 and T2, and then flow rate is found from known distance to the bottom of a groove flume where the fluid flows, the time data T1 and T2, the velocity of fluid etc. |
