24-10-2012, 10:52 AM
Design and Performance Assessment of a Stable Astigmatic Herriott Cell for Trace Gas Measurements on Airborne Platforms
ABSTRACT
The present paper discusses a new, more stable, astigmatic Herriott cell employing carbon fiber stabilizing rods.
Laboratory tests using a near-IR absorption feature of CO at 1564.168-nm revealed a factor of two improvement in
measurement stability compared with the present commercial design when the sampling pressure was changed by +/-2 Torr
around 50 Torr. This new cell should significantly enhance our efforts to measure trace gases employing pathlengths of 100
to 200-meters on airborne platforms with minimum detectable line center absorbances of less than 10(exp -6).