Patent ID: 8488112

Claim:
A method for contactless measurement of a density of a porous material, the method comprising: determining an optical path corresponding to a crossing of an object, made of the porous material, by an optical coherence tomography technique using a light beam, the porous material being translucent or transparent to the light beam, determining a thickness of the object, determining a refractive index of the porous material, at a central wavelength of the light beam, from the determined optical path and thickness, and determining the density of the porous material from the determined refractive index, wherein the object is spherical and hollow and has outer and inner diameters, the inner diameter and the optical path are determined by optical coherence tomography, the outer diameter is determined by backlit shadowgraphy, and the thickness of the object is determined by calculating half the difference between the determined outer and inner diameters.