To more easily and more accurately perform measurement using colorimetric type detection paper even in the case where humidity changes.
The reflectivity of the detection paper 101 in the reflecting spectrum of coloring matter is measured by a reflectivity measuring part 102. Next, the humidity of the atmosphere of the detection paper 101 is measured by a hygrometer 103. Subsequently, a coloring matter correction value obtained by multiplying a value, which is calculated by multiplying the moisture amount held to the detection paper 101 calculated from the humidity measured by the hygrometer 103 by the coefficient of the moisture amount, by the amount of the coloring matter held to the detection paper 101 and the coefficient of absorbance of the coloring matter is calculated in a correction value calculating part 104. Next, the reflectivity measured on the basis of the coloring matter correction value calculated in the correction value calculating part 104 is corrected. Thereafter, a concentration calculating part 106 calculates the amount of the target gas reacted with a detection agent, by the corrected reflectivity.
MARUO YOKO
YAMADA TAKUMI
KUNIOKA TATSUYA
NAKAMURA JIRO
| JP2009069048A | 2009-04-02 |
Hiroro Kurokawa
Shigeki Yamakawa