| 摘要 |
An instrument for determining ozone concentration in a gaseous fluid includes a chamber, at least one filter adapted to remove particulates from gaseous fluid entering the chamber, and at least one filter adapted to remove ozone from gaseous fluid entering the chamber. At least one element is arranged to draw gaseous fluid into the chamber. An ultra-violet source located at one end of the chamber and configured to generate a substantially collimated beam of radiation having a wave length in the range 240 to 290 nm, and an ultra-violet sensor is arranged at the other end of the chamber and configured to receive the ultra-violet light emitted by the said ultra-violet source.
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