JP2002340795A5 - - Google Patents
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- JP2002340795A5 JP2002340795A5 JP2001146782A JP2001146782A JP2002340795A5 JP 2002340795 A5 JP2002340795 A5 JP 2002340795A5 JP 2001146782 A JP2001146782 A JP 2001146782A JP 2001146782 A JP2001146782 A JP 2001146782A JP 2002340795 A5 JP2002340795 A5 JP 2002340795A5
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- Prior art keywords
- wavelength
- gas
- region
- detection signal
- carbon dioxide
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Description
この第１発明に係る同位体ガス測定装置では、従来、吸光度を算出するための基準として利用されていた二酸化炭素を含まない参照ガスに対する検出信号に代えて、被測定ガス自体の、二酸化炭素やそのほかの光を吸収する物質が存在しない波長の透過光に対する検出信号を利用する。そのために、第３の試料セルが用意され、例えば、第１、第２及び第３の試料セルには直列的に被測定ガスが流される。被測定ガスが呼気である場合、12ＣＯ2及び13ＣＯ2に対応した第１、第２の波長よりも長波長の領域には、主として水による吸収ピークが数多く存在する。一方、第１、第２の波長よりも短波長側に隣接した領域には、他の物質による吸収ピークは存在しない。そこで、上記第３の波長としては、このような領域の波長を選ぶようにするとよい。 In the isotope gas measuring apparatus according to the first invention, conventionally, instead of the detection signal for the carbon dioxide-free reference gas, which has been used as a reference for calculating the absorbance, the carbon dioxide or the gas to be measured itself is used. A detection signal for transmitted light having a wavelength in which no other light-absorbing substance is present is used. Therefore, the third sample cell is prepared, for example, the first, second and third sample cell Ru are serially the measurement gas flow. When the gas to be measured is exhaled air, many absorption peaks mainly due to water are present in a region having a longer wavelength than the first and second wavelengths corresponding to 12 CO 2 and 13 CO 2 . On the other hand, in a region adjacent to the shorter wavelength side than the first and second wavelengths, there is no absorption peak due to another substance. Therefore, it is preferable to select a wavelength in such a region as the third wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001146782A JP2002340795A (en) | 2001-05-16 | 2001-05-16 | Apparatus for measuring isotope gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001146782A JP2002340795A (en) | 2001-05-16 | 2001-05-16 | Apparatus for measuring isotope gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002340795A JP2002340795A (en) | 2002-11-27 |
| JP2002340795A5 true JP2002340795A5 (en) | 2007-10-25 |
Family
ID=18992369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001146782A Pending JP2002340795A (en) | 2001-05-16 | 2001-05-16 | Apparatus for measuring isotope gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002340795A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2016047169A1 (en) * | 2014-09-22 | 2017-04-27 | 株式会社東芝 | Gas measuring device |
| JPWO2016047170A1 (en) * | 2014-09-22 | 2017-04-27 | 株式会社東芝 | Exhalation diagnostic device |
| WO2016117173A1 (en) * | 2015-01-20 | 2016-07-28 | 株式会社 東芝 | Breath measurement device, breath measurement method, and gas cell |
| CN104964944B (en) * | 2015-06-23 | 2017-10-31 | 广州华友明康光电科技有限公司 | A kind of two-way infrared spectrum analysis system and its detection method |
| US20200348227A1 (en) * | 2018-01-22 | 2020-11-05 | Sekisui Medical Co., Ltd. | Carbon isotope analysis device and carbon isotope analysis method |
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2001
- 2001-05-16 JP JP2001146782A patent/JP2002340795A/en active Pending
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