| タイトル | Laboratory evaluation of an airborne ozone instrument that compensates for altitude/sensitivity effects |
| 著者（英） | Hudgins, C. H.; Gregory, G. L.; Edahl, R. A., Jr. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1983-02-01 |
| 言語 | eng |
| 内容記述 | One problem encountered in the use of air-quality instrumentation on aircraft is the variation of instrument sensitivity with pressure as the result of altitude changes of the aircraft. Many instruments experience sensitivity changes of as much as a factor of 2 at altitudes of 6 km. Discussed are recent modifications to a chemiluminescent (ethylene) ozone detector that allow the instrument to automatically compensate for pressure/sensitivity effects. The modification provides automated mass flow rate control for both the sample and ethylene gas flows. The flow control systems maintain flow rate to within 15 percent for a 100-torr instantaneous pressure change, and flow rates are returned to the desired set points within 10 s after the pressure change. During simulated altitude changes (300 m/min from mean sea level to 3-km altitude), flow rates were controlled to within 3 percent of the set point. Laboratory data are summarized verifying the operation of the instrument for a pressure range of 760 torr (sea level) to 350 torr (approximately 20,000 ft) and an ozone concentration range from 20 to approximately 700 ppb. |
| NASA分類 | AIRCRAFT INSTRUMENTATION |
| レポートNO | 83A45618 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/402560 |
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