| 摘要 |
An NDIR instrument used for measuring the carbon dioxide content of a gas sample includes an electrically modulated incandescent lamp (28) disposed at one end of a sample cell (22) for containing the gas to be analyzed, and a first pyroelectric detector (32) at the other end of the cell. The instrument (10) correctly determines the concentration of carbon dioxide despite "leakage" of the broad-band infrared radiation emitted by the lamp through the sample to be analyzed. The temperature of the first pyroelectric detector may be regulated. The intensity of the radiation emitted by the lamp may be controlled by a feedback loop.
|
