Logarithmic signals from continuous-scan porosimetry

5 Logarithmic signals from continuous-scan porosimetry 

The signals produced by the strain gauge can be amplified linearly or logarithmically. In the linear mode the displacement of the X-V recorder along the X or pressure axis is inversely proportional to the pore radius as given by equation (10.24) 

When the strain gauge signal is fed to the recorder as the logarithm of the pressure the following relationships exist using A as — 2ycos0 

Combining equations (20.1) and (20.2) and taking derivatives of each side, yields 

Equation (20.3) is in the form of first-order decay equation which describes a first-order chemical reaction or radioactive decay. It es- 

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