DEVICE FOR MEASURING THE BIDIRECTIONAL SCATTERING FUNCTION (EMBODIMENTS) Russian patent published in 2023 - IPC G01N21/01 G01N21/47 

FIELD: optical measurement methods.

SUBSTANCE: claimed device for measuring the bidirectional scattering function comprises an illuminating unit, including a light source with an output condenser, a photodetectors unit located along a quarter-circle arc configured for its azimuth rotation around the normal to the surface of the measured sample, placed in the centre of the curvature of the arc. The measured sample is fixed on the turntable by means of fasteners and configured for its rotation around the normal to the surface of the measured sample by the azimuth angle 0°¸ 360°, and the illuminating unit is equipped with a reflector of radiation from the light source. An input condenser and a monochromator are located between the light source and the output condenser, and along the propagation of radiation from the lighting unit, a beam splitter is installed that directs radiation into the correction unit with the light flux detector and into the unit of rotary mirrors that direct the radiation along the sides of the quadrangle to the measured sample located also at the top of the quadrilateral adapted for rotation around the optical axis of the elements of the illuminating unit. In this case, the photodetectors unit is configured for additional polar rotation along the arc on which they are located, and a focusing lens with a field diaphragm is installed in front of the input surface of each photodetector, and the normal to the input surface of the photodetector is oriented to the optical axis of the latter at an angle exceeding its angular field of view.

EFFECT: expansion of the functionality of measurements, which increases the accuracy of measurements of the scattering properties of samples with additional characteristics.

3 cl, 2 dwg