FAST RESPONSE INSTRUMENTATION FOR THE MEASUREMENT OF TURBULENT FLUXES IN THE LOWER ATMOSPHERE AND A FILM READER SYSTEM AND ANALOG STATISTICAL ANALYZER.
IOWA ENGINEERING EXPERIMENT STATION AMES
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The goal of the research was to develop rapid reponse instrumentation suitable for the measurement of the turbulent fluxes of momentum, heat, and water vapor in the boundary layer. The instrumentation selected and developed for the measurement of mass transport and temperature was a gated continuous-wave two-head sonic anemometer. An infrared technique was developed to measure specific humidity over a one-meter open path. In order to establish the specifications for these two instruments so that they would be compatible with the flux calculations to be undertaken, a careful study and error analysis was made of the flux calculations. The analysis was directed both toward the determination of tolerance limits on the instruments and the development of efficient programs of calculation. The development of a film reader which can be used in the analog processing of fluctuation data to extract statistical properties is also discussed.