Instrument Overview
Ozone is measured with a compact and lightweight 2B Technologies, Inc. Model 205 Ozone Monitor as the platform base. The 2B ozone instrument uses the ultraviolet (UV) absorption method to measure ozone concentrations (accurate to 1 ppbv or 2% of reading). The instrument records 2-second measurement data at 10-second intervals to give a dynamic view of the vertical profiling of ozone in the lower atmosphere. Temperature and relative humidity has been added to the data stream, due to the inclusion of a Vaisala Temperature and Humidity probe and a Garmin GPS receiver.
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Ozone Instrument Details
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Ozone absorption measurements take place every two seconds in the ozone monitor although we record data averages over 10 seconds. Air, after traveling into the inlet and through a Teflon particle filter, is pulled through an ozone scrubber for every other measurement. This “zero” reference measurement, alternates between Cell 1 and Cell 2. A mercury lamp illuminates these cells and at the opposite end of each cell is a detector that makes a measurement of light that has not been absorbed by ozone. A flowmeter has been installed to monitor instrument flow, as flow through the cells must remain at approximately 1L/min.
Additional components installed in the suitcase include a fan, strip heaters, a flash card data writer, a 12-V rechargeable battery, a micro-SD backup data writer, Vaisala Temperature and Humidity probe, Garmin GPS receiver, and an additional zero cycle (to calculate instrument drift).
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