Abstract
A Lyman-alpha hygrometer with a reduced sampling volume has been developed in order to measure small-scale, fast fluctuations of humidity in laboratory. It is combined with an X-wire anemometer probe to measure the local value of the turbulent flux or with a resistant wire temperature probe to measure humidity-temperature mixed statistics. In order to determine the influence of the flow distortion by the probe itself on these measurements, the structure of the flow is investigated experimentally both inside the hygrometer sampling volume and at the location of the velocity or temperature probe. This investigation includes flow visualizations, measurements with a single hot wire in a calibration tunnel and measurements with a X-wire probe and a temperature resistance wire probe in a large turbulent boundary layer.
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