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The Transient Line Source (TLS) method is used to measure thermal conductivity or thermal resistivity of soil and rock materials. Using the interactive demonstration below, you can learn how to calibrate and test with the TLS. The reference material has been measured by an absolute method and values recorded.
Paper: B. Pilkington, P. de Wilde, S. Goodhew, and R. Griffiths. 2006. Development of a Probe for Measuring In-situ the Thermal Properties of Building Materials. The 23rd Conference on Passive and Low Energy Architecture, Geneva, Switzerland, 6-8 September 2006.
Available at: http://www.unige.ch/cuepe/html/plea2006/Vol2/PLEA2006_PAPER185.pdf
ASTM: ASTM D5334-14, Standard Test Method for Determination of Thermal Conductivity of Soil and Soft Rock by Thermal Needle Probe Procedure, ASTM International, West Conshohocken, PA, 2014, www.astm.org