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Temperature Effects in a Tensiometer-Pressure Transducer System¹

ABSTRACT

A tensiometer-pressure transducer system using nylon hydraulic leads was found to be sensitive to small temperature fluctuations. A suitable model to describe the effect was developed, and the appropriate differential equation was solved in terms of the pressure variation occurring in the system for a sinusoidal pattern of temperature change. Experiments are described in which the measuring system is subjected to a sinusoidal temperature variation and the induced pressure changes recorded. From such records the amplitude and phase shift of the pressure are determined and compared with those obtained from the model solution.

¹ Contribution from the Soil and Water Conserv. Res. Div., ARS, USDA, Phoenix, Ariz.

² Research Civil Engineer and Research Physicist, respectively, US Water Conserv. Lab., Phoenix, Ariz. During 1966 the senior author was on sabbatical leave from the School of Civil Engineering, Univ. of New South Wales, Kensington, N. S. W. Australia.

Received for publication September 26, 1966. Accepted for publication December 14, 1966.