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US 2008/0166267 A1Published application
Ozone gas sensing element, detection apparatus, and measurement method
AssigneeNippon Telegraph and Telephone Corporation
InventorsYasuko Maruo, Shigeo Ogawa, Seizou Sakata, Tohru Tanaka
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Abstract
A sensing element in which a dye that changes in the light absorption characteristic of the visible region upon reaction with ozone gas is deposited in the pores of a porous material is prepared. A change in dye before and after exposing the sensing element to a measurement environment for a predetermined time is measured. The ozone gas amount in measurement target air is measured on the basis of the change in dye.
Claims19
An ozone gas measurement apparatus comprising:
- a light-emitting unit;
- a light-detecting unit;
- a sensing element;
- and
- a signal processing unit, wherein said light-emitting unit emits light having a predetermined wavelength, said sensing element is interposed between said light-detecting unit and said light-receiving unit, and comprises a porous material, and a dye which is deposited in a pore of the porous material and changes in a light absorption characteristic of a visible region upon reaction with ozone gas, said light-detecting unit comprises a light-receiving surface arranged to face said light-emitting unit, receives, via said sensing element, light emitted by said light-emitting unit, and outputs a signal corresponding to a light quantity received by the light-receiving surface, and said signal processing unit calculates an ozone gas amount on the basis of the signal output from said light-detecting unit and a light absorption characteristic, obtained in advance, of said sensing element which contains the dye before reaction with the ozone gas.
2 more elements
Dependencies are inferred from the claim text.