In-situ measurement of thermal conductivity using the continuous-heating line source method and WHOI outrigged probe

The outrigged thermal probes of a "pogo" marine geothermal probe have been adapted to measure thermal conductivity in-situ by the continuous-heating line source technique. The instrumental uncertainty in applying the analytical theory to a single-probe and double-probe configuration is found to be 3 and 6 percent, respectively. The in-situ outrigged single probe <.32 cm dia.) is essentially a scaled-up version of the needle probe (.08 cm dia.). The main advantage of the outrigged probe over a larger radius probe <e.g., violin-bow probe) is that for short-time temperatures (