| 摘要 |
FIELD: physics. ^ SUBSTANCE: device has a radiation source, a polariser, powder of the analysed object with particle size of 10-35 mcm, an analyser, an apodisation diaphragm and a CCD camera, all lying on an optical axis. The apodisation diaphragm is in form of two identical discs with centre holes in form of asymmetrical figures in the plan view, at least one of which can turn about their common optical axis. Between the analyser and the CCD camera there is an input mirror through which radiation from an extra light source is directed through an extra objective lens to the analysed object which lies from the extra objective lens at a distance determined using Newton's formula. Radiation from the analysed object in the reflected light and radiation passing through the powder of the analysed object is directed to the matrix of the CCD camera. ^ EFFECT: higher measurement accuracy. ^ 2 cl, 1 dwg |
