Method and sensor for detecting a chemical substance using an optically anisotropic material
First Claim
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1. A method for indicating an end of life of a respirator cartridge, an air purifying cartridge or a filtration cartridge by detecting a chemical substance in an analyte, comprising steps of:
- providing an optically anisotropic material forming a porous fiber or slab in a sorbent bed of the respirator cartridge, air purifying cartridge or filtration cartridge;
subjecting the sorbent bed to the analyte;
passing visible light through the anisotropic material by transilluminating the anisotropic material with the light;
collecting at least a portion of the passed visible light; and
detecting a change in a polarization state of the collected visible light, the change being indicative of the chemical substance in the analyte having reached the anisotropic material through the sorbent bed.
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Abstract
A method and sensor for detecting a chemical substance in an analyte. An anisotropic material is subjected to the analyte. Light is passed through the anisotropic material and collected. A change of an optical anisotropy of the collected light is detected, the change being indicative of the chemical substance in the analyte.
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Citations
91 Claims
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1. A method for indicating an end of life of a respirator cartridge, an air purifying cartridge or a filtration cartridge by detecting a chemical substance in an analyte, comprising steps of:
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providing an optically anisotropic material forming a porous fiber or slab in a sorbent bed of the respirator cartridge, air purifying cartridge or filtration cartridge; subjecting the sorbent bed to the analyte; passing visible light through the anisotropic material by transilluminating the anisotropic material with the light; collecting at least a portion of the passed visible light; and detecting a change in a polarization state of the collected visible light, the change being indicative of the chemical substance in the analyte having reached the anisotropic material through the sorbent bed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A sensor for indicating an end of life of a respirator cartridge, an air purifying cartridge or a filtration cartridge by detecting a chemical substance in an analyte, comprising:
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an optically anisotropic material forming a porous fiber or slab provided in a sorbent bed of the respirator cartridge, air purifying cartridge or filtration cartridge, the sorbent bed to be subjected to the analyte; a light supply passing visible light through the anisotropic material by transilluminating the anisotropic material with the light; a collector capturing at least a portion of the passed visible light; and a detector characterizing or quantifying a change in a polarization state of the collected visible light, the change being indicative of the chemical substance in the analyte having reached the anisotropic material through the sorbent bed. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91)
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Specification