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|Title:||Electrical analog study of errors in ground temperature measurement|
|Authors:||United States. Army. Corps of Engineers. New England Division.|
Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering.
Cunningham, James P.
Rohsenow, Warren M.
|Publisher:||Arctic Construction and Frost Effects Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (Arctic Construction and Frost Effects Laboratory (U.S.)) ; 70.|
Summary: This report covers an investigation of errors inherent in the measuring of temperatures in the ground using temperature-sensing devices attached to a conducting probe inserted vertically in the ground. Of particular interest is the use of a standard copper-rubber cable. Analogue computer results are presented with ground materials of light snow, heavy snow, and ice, with cables 4.5 ft and 7.5 ft long. Errors are measured 16 hours after immersion of the probe, when a quasi-steady state is reached. The errors occurring with uniform temperature gradients in the ground, at least 1 ft to 1.5 ft from either end of the cable, are shown to be equivalent to an error in depth of less than 1 in. in light snow, and less than 1/8 in. in heavy snow and more conductive grounds. An approximate analytical solution is given and compared with the computer solutions.
|Appears in Collections:||Technical Report|
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|ACFEL-Technical-Report-70.pdf||2.95 MB||Adobe PDF|