| 摘要 |
A method for determining the fibre orientation of a product made of fibres comprises the steps of directing a polarized light beam at right angles to the plane of the paper constituting the product, reflecting the intensity of light in two planes at right angles to each other, forming from the intensity of relfected light two quantities, one of which is produced by passing the reflected light through a polarizer the plane of which is parallel to the plane of polarization of the light beam, while the other quantity is produced by passing the reflected light through a polarizer the plane of which is perpendicular to the plane of polarization of the light beam, forming differences of these quantities in both planes and using the ratio and/or difference of these differences as an index value for the anistrophy of fibre orientation.
|
