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Title:
GAS COMPONENT DETECTOR
Document Type and Number:
Japanese Patent JP2012220351
Kind Code:
A
Abstract:

To suppress decrease in an infrared light reception amount that is caused by incident angle dependence of a wavelength filter.

An optical path of infrared rays (See a broken line of FIG. 1) is changed to be a substantially U-shaped by a first reflecting mirror 80 and a second reflecting mirror 81. Therefore, an incident angle (an angle formed by a normal direction of the surface of the wavelength filter 5, hereinafter same) of infrared rays of a wavelength filter 5 is nearly zero degree so that influence of incident angle dependence of the wavelength filter 5 can be hardly given as compared with conventional examples. As a result, the amount of infrared rays passing through the wavelength filter 5 to reach a light reception part 4 can be increased and reduction in detection accuracy of gas components can be suppressed.


Inventors:
MATSUSHIMA SHUNSUKE
FURUKUBO HIDEKAZU
Application Number:
JP2011086891A
Publication Date:
November 12, 2012
Filing Date:
April 11, 2011
Export Citation:
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Assignee:
PANASONIC CORP
International Classes:
G01N21/35; G01N21/3504
Domestic Patent References:
JPH11118711A1999-04-30
JPS6413439A1989-01-18
JP2005233958A2005-09-02
JP2002350341A2002-12-04
JP2006017712A2006-01-19
JP2006003233A2006-01-05
JP2001153801A2001-06-08
JP2006300738A2006-11-02
JP2006514745A2006-05-11
JP2007507723A2007-03-29
JPH0924799A1997-01-28
JP2002352347A2002-12-06
JP2003248877A2003-09-05
Foreign References:
US6410918B12002-06-25
Attorney, Agent or Firm:
Keisei Nishikawa
Mizuhiji Katsuhisa
Takeshi Sakaguchi
Hidetoshi Kitade



 
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