Enhancing selectivity and/or sensitivity of spectroscopic measurements in media
First Claim
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1. An apparatus for enhancing spectroscopic measurements of one or more analytes in a sample, the apparatus comprising:
- optics that collect light scattered from a sample illuminated by a source of optical radiation, the sample containing one or more analytes;
a spatial filter positioned to reduce the strength of light scattered from or around a surface of the sample and collected by the optics;
a spectroscopic apparatus positioned to receive the scattered light collected by the optics, that divides the received light according to wavelength; and
one or more optical detectors that receive the wavelength-divided light from the spectroscopic apparatus.
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Abstract
An apparatus for enhancing the selectivity for spectroscopic measurements of analytes in a turbid medium is described. In one example, spatial filters are used to select only certain radii from the medium to be imaged. This selection is accomplished by placing an optical obstruction on the surface of the medium or at an image plane of the surface later in the optical imaging system. In one implementation, this is achieved by placing a fiber bundle at an image plane of the collecting optical system and then using a spacer of appropriate size at the center of the fiber bundle to act as a central obstruction.
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Citations
9 Claims
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1. An apparatus for enhancing spectroscopic measurements of one or more analytes in a sample, the apparatus comprising:
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optics that collect light scattered from a sample illuminated by a source of optical radiation, the sample containing one or more analytes; a spatial filter positioned to reduce the strength of light scattered from or around a surface of the sample and collected by the optics; a spectroscopic apparatus positioned to receive the scattered light collected by the optics, that divides the received light according to wavelength; and one or more optical detectors that receive the wavelength-divided light from the spectroscopic apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification