Polyimide waveguides as optical sensors
First Claim
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1. A polyimide waveguide consisting of at least two layers of a polyamideimide or perfluorinated polyimide coated onto a substrate and contacting a cover layer of liquid in the vapor phase at the surface of the polyamide-imide or perfluorinated polyimide.
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Abstract
The invention relates to a polyimide waveguide which is used as an optical sensor for the quantitative determination of liquids in the vapor phase, as well as for the determination of NH3, "NH4 OH", NO2 and N2 O5. The polyimide waveguide is composed of a cover layer, one or two layers of a polyamide-imide or a perfluorinated polyimide and a substrate.
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Citations
17 Claims
- 1. A polyimide waveguide consisting of at least two layers of a polyamideimide or perfluorinated polyimide coated onto a substrate and contacting a cover layer of liquid in the vapor phase at the surface of the polyamide-imide or perfluorinated polyimide.
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10. A device for detecting the presence of and measuring the relative amount of a molecule in a vapor comprising
a polyimide waveguide consisting essentially of at least one layer of a polyamide-imide or perfluorinated polyimide coated onto a substrate; - means for directing a polarized light onto the polyimide waveguide and coupling the polarized light into the layer of polyamide-imide or perfluorinated polyimide;
an area adjacent the surface of the polyimide waveguide for receiving the vapor of the liquid so that the vapor is in contact with the polyamide-imide or perfluorinated polyimide layer; means for coupling the polarized light out of the polyimide waveguide, and means for measuring the intensity of the phase shift of the polarized light. - View Dependent Claims (11, 12, 13, 14, 15, 16)
- means for directing a polarized light onto the polyimide waveguide and coupling the polarized light into the layer of polyamide-imide or perfluorinated polyimide;
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17. The method for detecting the presence of a vapor comprising
directing and coupling a polarized light into the polyamide-imide or perfluorinated polyimide layer of a polyimide waveguide including a polyamide-imide or perfluorinated polyimide layer coated on a substrate; -
contacting the surface of the polyamide-imide or perfluorinated layer with a vapor to induce an anisotropic interaction to cause an optical phase shift of the polarized light in the polyimide waveguide; and measuring the intensity of the optical phase shift caused by the anisotropic interaction.
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Specification