Patent ID: 7568379

Claim:
A method for measuring the porosity of an element by means of a device comprising: a measuring chamber in which the element is disposed, a solvent tank associated with an adsorption valve, arranged between the solvent tank and an inlet of the chamber, a pump associated with a desorption valve, arranged between an outlet of the chamber and the pump, a pressure sensor, and control means for controlling the adsorption and desorption valves, said measuring method comprising measurement of the pressure in the chamber by means of the pressure sensor, and a measuring cycle for measuring the porosity by ellipsometry, at different predetermined pressure, wherein, during the cycle for measuring the porosity by ellipsometry, said control means control opening of the adsorption and desorption valves according to the measured pressure, the relative pressure in the chamber being successively regulated to different predetermined values, while maintaining a continuous flow of solvent in the chamber between the tank and the pump.