发明名称 |
Method for calibration of chemical sensor in measuring changes in chemical concentration |
摘要 |
Changes in the concentration of a chemical, such as a gas, are determined using a non-linear chemical sensor which is subject to shifts in calibration over time. In order to minimize errors caused by such shifts in calibration a first infrared signal (Ig(1)) is measured and using an absorption value under an assumed chemical concentration (C(1)), a zero chemical signal Io(1) is calculated using the known physical law and mathematical relation Absorption=1-Ig/Io. A second infrared signal (Ig(2)) is then measured and the absorption value is calculated using the previously calculated zero chemical signal. A second concentration (C(2)) is then determined and the change in concentration is calculated by subtracting C(2) from C(1).
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申请公布号 |
US6360582(B1) |
申请公布日期 |
2002.03.26 |
申请号 |
US20000484829 |
申请日期 |
2000.01.18 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
CHELVAYOHAN MAHESAN;KROGER PATRICK L. |
分类号 |
G01N21/35;G01N33/00;(IPC1-7):G01N21/01;G01N27/00 |
主分类号 |
G01N21/35 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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