Sensor for determining concentration of gas
First Claim
1. Optical sensor unit for measuring a concentration of a gas, comprising:
- a first gas-permeable layer adjacent to a first side of at least one sensing layer and adapted to pass gas which concentration is to be measured through the first gas-permeable layer towards the at least one sensing layer;
the at least one sensing layer adapted to be irradiated with a predetermined radiation and to emit a corresponding optical response, wherein the optical response depends on the concentration of the gas;
a fluid film or a contact medium interposed between the first gas-permeable layer and a second gas-permeable layer, the fluid film or the contact medium being on a side of the first gas-permeable layer that is opposite the at least one sensing layer,a removable protective layer covering at least the second gas-permeable layer and adapted to be removed before use of the optical sensor unit;
an adhesive layer interposed between the removable protective layer and a structure supporting at least the at least one sensing layer and/or the first gas-permeable layer; and
the second gas-permeable layer interposed between the removable protective layer and the fluid film or the contact medium, wherein the first gas-permeable layer and the second gas-permeable layer confine at least part of the fluid film or the contact medium there-between.
1 Assignment
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Accused Products
Abstract
An optical sensor unit (10) for measuring a concentration of a gas is provided, comprising at least one sensing layer (122) adapted to be irradiated with a predetermined radiation; at least one gas-permeable layer (121) adjacent to one side of the at least one sensing layer (122) and adapted to pass gas which concentration is to be measured through the gas-permeable layer (121) towards the sensing layer (122); a removable protective layer (150) covering at least the gas-permeable layer (121) and adapted to be removed before use of the optical sensor unit (10), wherein the optical sensor unit (10) is adapted to measure an optical response of the at least one sensing layer (122), which optical response depends on the concentration of the gas.
11 Citations
19 Claims
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1. Optical sensor unit for measuring a concentration of a gas, comprising:
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a first gas-permeable layer adjacent to a first side of at least one sensing layer and adapted to pass gas which concentration is to be measured through the first gas-permeable layer towards the at least one sensing layer; the at least one sensing layer adapted to be irradiated with a predetermined radiation and to emit a corresponding optical response, wherein the optical response depends on the concentration of the gas; a fluid film or a contact medium interposed between the first gas-permeable layer and a second gas-permeable layer, the fluid film or the contact medium being on a side of the first gas-permeable layer that is opposite the at least one sensing layer, a removable protective layer covering at least the second gas-permeable layer and adapted to be removed before use of the optical sensor unit;
an adhesive layer interposed between the removable protective layer and a structure supporting at least the at least one sensing layer and/or the first gas-permeable layer; andthe second gas-permeable layer interposed between the removable protective layer and the fluid film or the contact medium, wherein the first gas-permeable layer and the second gas-permeable layer confine at least part of the fluid film or the contact medium there-between. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for measuring a concentration of gas using an optical sensor unit comprising a first gas-permeable layer adjacent to one side of at least one sensing layer and adapted to pass gas which concentration is to be measured through the first gas-permeable layer towards the at least one sensing layer, the at least one sensing layer adapted to be irradiated with a predetermined radiation and to emit a corresponding optical response, the optical response depending on the concentration of the gas, a fluid film or a contact medium interposed and confined between a side of the first gas-permeable layer that is opposite the at least one sensing layer and a second gas-permeable layer, the fluid film or the contact medium being a gel, fluid, buffer solution, or a liquid, the second gas-permeable layer interposed between a removable protective layer and the fluid film or the contact medium, an adhesive layer interposed between the removable protective layer and a structure supporting at least the at least one sensing layer and/or the first gas-permeable layer, and the removable protective layer covering at least the second gas-permeable layer and adapted to be removed before use of the optical sensor unit, wherein the fluid film or the contact medium is adapted to control the water content of the first gas-permeable layer and/or the at least one sensing layer, the method comprising the steps of:
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removing the protective layer from the optical sensor unit, attaching the optical sensor unit to an object releasing gas using the adhesive layer, receiving gas which concentration is to be measured in the at least one sensing layer after passing the first gas-permeable layer, irradiating the at least one sensing layer with the predetermined radiation, and sensing the optical response of the at least one sensing layer, which depends on the concentration of the gas. - View Dependent Claims (18, 19)
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Specification