Optical filter for spectroscopic measurement and method of producing the optical filter
First Claim
Patent Images
1. An optical filter comprising:
- a generally circular substrate having a top surface and a bottom surface; and
a plurality of optical coatings deposited on said top surface of said substrate such that said coatings vary linearly in thickness in a first direction across said top surface, said coatings remaining substantially constant in thickness across said top surface in a second direction substantially perpendicular to said first direction.
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Abstract
An optical filter used in applications involving spectroscopic measurements is fabricated by depositing layers of optical coatings onto a substrate. The layers are deposited so as to have a substantially constant thickness in a first direction along the surface of the substrate, and a gradually increasing thickness along a direction perpendicular to the first direction. The structure of the optical filter allows for large scale production of the filter so that costs in producing the filter are greatly reduced. The filter may be used in a variety of applications including, but not limited to chemical analysis, blood glucose monitoring, and the like.
1049 Citations
21 Claims
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1. An optical filter comprising:
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a generally circular substrate having a top surface and a bottom surface; and a plurality of optical coatings deposited on said top surface of said substrate such that said coatings vary linearly in thickness in a first direction across said top surface, said coatings remaining substantially constant in thickness across said top surface in a second direction substantially perpendicular to said first direction. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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2. An optical filter comprising:
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a substrate having, a top surface and a bottom surface; and a plurality of layers of optical coatings varying in thickness in a first direction along, said substrate, said layers providing optical transmission characteristics for said optical filter to provide an optical filter which transmits more than one wavelength passband through said filter at each location across the surface of said filter. - View Dependent Claims (12, 13)
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14. An optical filter comprising:
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a generally circular substrate having a surface and a plurality of rotational positions around said surface; and a plurality of optical coatings deposited on said surface which vary linearly in thickness in a first direction across said surface and remain substantially constant in thickness in a second direction substantially perpendicular to said first direction, providing transmission characteristics as a function of wavelength and said rotational positions. - View Dependent Claims (15, 16, 19, 20, 21)
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17. An optical filter comprising:
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a generallv circular substrate having a surface and a plurality of rotational positions around said surface; and a plurality of optical coatings deposited on said surface which vary in thickness in a first direction and remain substantially constant in thickness in a second direction substantially perpendicular to said first direction, providing transmission characteristics as a function of wavelength and said rotational positions, said transmission characteristics including a plurality of passbands for each of a plurality of wavelengths. wherein said wavelengths are in a range from 700 to 1,400 nanometers. - View Dependent Claims (18)
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Specification