J. Raymond

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In biomedical ultrasound, experimental work may be performed at various temperatures whereas hydrophone calibration data are typically specified at only one temperature. It is necessary to know the temperature dependence, if any, of hydrophone sensitivity. Comparison of the results of a three-transducer reciprocity calibration of an Imotec type 80-0.5-4.0(More)
The in situ thermal conductivity of the subsurface has been measured with a novel thermal response test using heating cables inserted in a vertical ground heat exchanger. An electric current is applied along the cables to heat the borehole prior to measuring water temperature recovery at various depths inside the ground heat exchanger piping. The(More)
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