Blocker device for eliminating specular reflectance from a diffuse reflection spectrum
First Claim
1. An apparatus for obtaining a diffuse reflectance spectra comprising:
- means for providing an incident energy beam;
means for directing the incident energy beam to a sample;
means for collecting energy that is diffusely reflected from the sample;
blocking means positioned on or adjacent to the sample to substantially eliminate energy that is specularly reflected off the sample.
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Accused Products
Abstract
Diffuse reflectance spectra may be obtained that are free from the distortions caused by specular reflections by using an apparatus and method for physically blocking out specularly reflected energy. The apparatus consists of a blocker that is positioned substantially in contact with the surface of the sample at the region wherein an input beam of energy is focused on the sample. Specularly reflected energy that would otherwise be reflected to a detector is physically blocked by the blocker. That part of the input energy beam that penetrates into the sample is diffusely reflected. Part of the diffusely reflected energy passes under the blocker where it is collected and focused on the detector. The blocker is found to have particular application in the field of infrared spectroscopy of inorganic compounds, particularly compounds having a powdered structure.
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Citations
20 Claims
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1. An apparatus for obtaining a diffuse reflectance spectra comprising:
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means for providing an incident energy beam; means for directing the incident energy beam to a sample; means for collecting energy that is diffusely reflected from the sample; blocking means positioned on or adjacent to the sample to substantially eliminate energy that is specularly reflected off the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus responsive to a distribution of energy in a reflectance spectra, comprising
means for directing an incident energy beam to a sample; -
means for receiving energy reflected from the sample; and blocking means positioned on or adjacent to the sample to block out energy specularly reflected off the sample. - View Dependent Claims (11, 12, 13, 14)
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15. A method for blocking out specularly reflected energy, comprising
directing energy to a sample; -
positioning a blocking element on or adjacent to the sample so that the specularly reflected energy from a surface of the sample is separated from energy diffusely reflected from the sample; collecting the energy diffusely reflected from the sample. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification