| US 7,615,192 B2 | ||
| Ozone gas measurement apparatus | ||
| Yasuko Maruo, Kanagawa (Japan); Shigeo Ogawa, Kanagawa (Japan); Seizou Sakata, Tokyo (Japan); and Tohru Tanaka, Tokyo (Japan) | ||
| Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (Japan) | ||
| Filed on Mar. 13, 2008, as Appl. No. 12/75,639. | ||
| Application 12/075639 is a division of application No. 10/650533, filed on Aug. 27, 2003, granted, now 7,364,700. | ||
| Claims priority of application No. 2002-351034 (JP), filed on Mar. 12, 2002; and application No. 2002-249503 (JP), filed on Aug. 28, 2002. | ||
| Prior Publication US 2008/0166267 A1, Jul. 10, 2008 | ||
| Int. Cl. G01N 33/00 (2006.01) | ||
| U.S. Cl. 422—68.1 [422/83; 422/86; 422/88] | 19 Claims |
| 1. 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, wherein the porous material is transparent, and wherein a thin water
film is formed in the pore, 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.
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