Measurement devices for cryogenic turbulence research

Recent interest in the study of turbulence using liquid and gaseous helium has prompted the need for high-quality fluid dynamical measurements in a cr yogenic environment. To meet this need we have been developing two measurem ent tools specifically designed to operate below 10 K. The first is a high- accuracy pressure transducer capable of resolving over five orders of magni tude in pressure at both room temperature and at low temperatures. The seco nd is a I MHz cryogenic thermal sensor that can be used as a hot film anemo meter to measure velocity fluctuations. In this paper we report on the desi gn features of the devices and measurement results. (C) 2001 Elsevier Scien ce Ltd. All rights reserved.