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Published in Soil Sci Soc Am J 57:930-934 (1993)
© 1993 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Test of a Heat-Pulse Probe for Measuring Changes in Soil Water Content

Keith L. Bristow*

CSIRO Division of Soils, Private Mail Bag, P.O. Aitkenvale, Townsville, QLD 4814, Australia

Gaylon S. Campbell

Dep. of Agronomy and Soils, Washington State Univ., Pullman, WA 99164

Kees Calissendorff

Soiltronics, 1111 Myrtle Drive, Burlington, WA 98233

*Corresponding author.

ABSTRACT

The maximum temperature rise measured at some distance from a line heat source can be used to determine the volumetric heat capacity and hence water content of porous media. We describe a simple heat-pulse device for determining the volumetric heat capacity and hence water content of porous media. The device consists of three needle probes (0.813-mm diam., 28 mm long) mounted in parallel. The heater probe contains a heating element while the sensor (mounted 6 mm from the heater) and reference probe (mounted 20 mm from the heater) contain thermocouples. The reference probe can be used to automatically correct for changes in background temperature. Measurements made at three depths during drying of a laboratory soil column yielded accurate changes in soil water content provided actual heater-to-sensor probe spacings were used in the calculations. We describe a simple procedure for checking on the probe spacings once the probes have been installed. These heat-pulse devices should prove useful for monitoring wetting or drying changes in soil water under both laboratory and field conditions.

Received for publication October 8, 1992.


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