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- W1996540051 abstract "We have developed an instrument to fly on the NASA WB-57F aircraft which measures simultaneously two atmospheric tracers, CO and N<SUB>2</SUB>O. These gases have lifetimes which make them appropriate dynamical tracers in the upper troposphere and lower stratosphere. To measure these species for studies of current interest we need a continuous record with a sensitivity of about 1 ppbv, and an absolute accuracy of about 1 percent. To trace the effect of small scale features requires a response time around 1 second. We describe the details of a tunable diode laser-based instrument designed for automatic operation aboard the WB- 57F aircraft at altitudes between the surface and 65,000 feet. A single diode laser, cooled by liquid nitrogen, is used to provide radiation at absorption lines of CO (2190.018 cm<SUP>-1</SUP>) and N<SUB>2</SUB>O (2190.350 cm<SUP>-1</SUP>). Fully reflective optics directs the infrared beam through a long pass cell (36 m path length) of small volume (0.3 l) operated at relatively low pressure (40 mb). The instrument operates autonomously for up to 8 hours. Calibration is achieved by the introduction of standard, calibrated mixtures into the inlet sample flow." @default.
- W1996540051 created "2016-06-24" @default.
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- W1996540051 date "1999-10-25" @default.
- W1996540051 modified "2023-09-23" @default.
- W1996540051 title "<title>Development of a tunable diode laser instrument for airborne in-situ measurements of carbon monoxide (CO) and nitrous oxide (N<formula><inf><roman>2</roman></inf></formula>O)</title>" @default.
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- W1996540051 doi "https://doi.org/10.1117/12.366443" @default.
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