Photoelectric gas analyzer
An analyzer for measuring the combined NO and NO2 concentrations includes a hollow cathode lamp with nitrogen/oxygen filling emitting radiation which is alternatingly passed through two narrow-band interference filters, one having a transmission range clearly outside any NO absorption bands and its...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | An analyzer for measuring the combined NO and NO2 concentrations includes a hollow cathode lamp with nitrogen/oxygen filling emitting radiation which is alternatingly passed through two narrow-band interference filters, one having a transmission range clearly outside any NO absorption bands and its NO2 absorption equals the difference of the absorption coefficients for NO and NO2 in the transmission band of the other filter. These two beams pass through a measuring gas cell and are photoelectrically detected for further processing. |
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