FOZAN-II, Fast - response Chemiluminescent Airborne Ozone Analyzer.

The design of the FOZAN-II dual-channel automatic fast-response (1 s) chemiluminescent ozone analyzer for a M55 Geophysica high-altitude aircraft is described. Its measured concentrations range is 10-500 mug/m(3) relative error, less than or equal to 10%; operating temperature range, -95...+40 degreesC; and its operating pressure range, 1100-30 mbar (0-22 km). The device has a built-in reference ozone generator (relative error of <6%) allowing one to autocalibrate the device in flight. Solid-state chemiluminescent sensors manufactured with the use of a coumarin 307 dye and a cellulose-acetate-based substrate have an operation-lifetime exceeding 25 h, are highly sensitive, and are rugged. Results obtained during one of the flights near the South Pole in September 1999 are presented