OPTICAL ANALYZER FOR IDENTIFICATION OF MATERIALS USING TRANSMISSION SPECTROSCOPY
First Claim
1. An optical analyzer system for identifying materials through transmission spectra analysis, the system comprising:
- a light source;
a sample holder system;
a sample aperture located between the light source and the sample holder system;
an optical efficiency enhancing element positioned between the light source and sample aperture, wherein the optical efficiency enhancing element is an optical homogenizer being a solid or hollow polygonal waveguide with an elliptically distorted polygonal cross section;
an optical spectrometer module operating in either of the 700-1100 nm spectral range or the 900-1700 nm spectral range, the optical spectrometer module positioned to receive light from the light source passing through the sample aperture and a sample within the sample holder system; and
a computer or microprocessor system interfaced with the optical spectrometer, wherein the computer or microprocessor system controls the collection of spectral data, storage of the collected spectral data, and processing and analysis of the spectral data.
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Abstract
A device and method for identifying solid and liquid materials use near-infrared transmission spectroscopy combined with multivariate calibration methods for analysis of the spectral data. Near-infrared transmission spectroscopy is employed within either the 700-1100 nm or the 900-1700 nm wavelength range to identify solid or liquid materials and determine whether they match specific known materials. Uses include identifying solid (including powdered) and liquid materials with a fast measurement cycle time of about 2 to 15 seconds and with a method that requires no sample preparation, as well as quantitative analysis to determine the concentration of one or more chemical components in a solid or liquid sample that consists of a mixture of components. A primary application of such analysis includes detection of counterfeit drug tablets, capsules and liquid medications.
20 Citations
3 Claims
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1. An optical analyzer system for identifying materials through transmission spectra analysis, the system comprising:
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a light source; a sample holder system; a sample aperture located between the light source and the sample holder system; an optical efficiency enhancing element positioned between the light source and sample aperture, wherein the optical efficiency enhancing element is an optical homogenizer being a solid or hollow polygonal waveguide with an elliptically distorted polygonal cross section; an optical spectrometer module operating in either of the 700-1100 nm spectral range or the 900-1700 nm spectral range, the optical spectrometer module positioned to receive light from the light source passing through the sample aperture and a sample within the sample holder system; and a computer or microprocessor system interfaced with the optical spectrometer, wherein the computer or microprocessor system controls the collection of spectral data, storage of the collected spectral data, and processing and analysis of the spectral data. - View Dependent Claims (2, 3)
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Specification