A sensor for water flux in soil. “Point source” instrument

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<jats:p>The theoretical analysis and laboratory calibration of a sensor to measure fluid flux in soil or other porous medium shows that a flow velocity of 10<jats:sup>−4</jats:sup> cm sec<jats:sup>−1</jats:sup> can be readily measured, and that sensor output is uniquely related to flux. The flow to be measured causes asymmetry in the temperature field,generated by an approximation to a point source of heat located centrally in the instrument. The temperature difference due to this asymmetry gives rise to the output of the instrument.</jats:p>

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