|Physics supporting oil leak detection approach||- Oil Leak Physics|
Change in thermal conductivity, as water is added to soil
Change in volumetric heat capacity as water is added to soil.
From “Soil Temperature Changes with Time and Depth: Theory” by D. L. Nofziger.
One might expect a similar effect as oil (from a leaking pipe) is added to soil.
“The amplitude of a temperature variation at the surface is normally about equal to that of the corresponding one for air. It decreases exponentially with distance from the surface, at a rate dictated by the time necessary for one complete cycle. This behaviour is shown above for the annual temperature variation. For depths below 5 to 6 m, ground temperatures are essentially constant throughout the year.” – Canadian Building Digest, “CBD-180. Ground Temperatures” by G.P. Williams and L.W. Gold.
From the above information, it seems that one would need to:
NEdT = Noise Equivalent differential Temperature
ADC enob = effective number of bits in the Analog-to-Digital converter (ADC)