Mid-infrared scanning system that differentiates between specular and diffuse scattering
US9546905B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Jul 6, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/556
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring diffuse and specularly reflected light from a sample to provide a reflection spectrum as a function of wavelength and as a function of position on a sample is disclosed. The apparatus includes a MIR light source that generates an illumination beam of linearly polarized light. An illumination system illuminates a location on a specimen with part of the illumination beam. A linear polarization filter characterized by a polarization axis that defines a direction of polarization of linearly polarized light that is reflected by the linear polarization filter, a first detector that measures an intensity of light leaving the linear polarization filter and a light collection system collects light reflected from the location on the specimen and directs that light to the linear polarization filter. A controller measures an output from the first detector for each of a plurality of different polarization axis positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.