APPARATUS AND METHOD FOR ANGULAR COLORIMETRY Russian patent published in 2011 - IPC G01N21/47 

FIELD: physics.

SUBSTANCE: apparatus for measuring the reflectance properties of an object having a front reflecting surface and at least one back reflecting surface includes a sample stage for placement of the object, a light source, a detector configured to detect reflected light from the object, and a positioning device configured to provide a plurality of angular positions for the light source and the detector relative to the object on the sample stage such that incident light on the object is specularly reflected towards the detector and the reflected light received at the detector includes a front surface reflection from the object and at least one back surface reflection from the object. The method involves illuminating the object at varying angles of incidence, collecting reflected light from the front and back reflecting surfaces of the object at respective specularly reflected angles, wavelength resolving the reflected light into a colour spectrum, and analysing an intensity of the colour spectrum as a function of wavelength.

EFFECT: invention increases measurement accuracy.

28 cl, 21 dwg