Patent ID: 9194799
Filing Date: 2015-11-24
Classification: G01N

Abstract:
1. A refractometer for multi-wavelength measurement of refractive index of a sample, comprising: a focusing optical system configured to direct an optical beam that includes a range of wavelengths to be incident on an interface between the sample and a prism at a range of angles of incidence including a critical angle, wherein the focusing optical system is configured to produce a linear illumination pattern at the interface so that the wavelength of light of the linear illumination pattern varies as a function of distance along the linear illumination pattern; and a dispersive optical system configured to spectrally spread the optical beam so that the range of wavelengths and the critical angle are independently detectable; wherein the refractometer is configured so that at least portions of the optical beam are totally internally reflected within the prism at a first reflection area and at least portions of the optical beam are totally internally reflected within the prism at a second reflection area.