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Progress in water vapour spectroscopy at RAL

Progress in water vapour spectroscopy at RAL. Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010. Plan for mid-IR measurements. 800 – 2100 cm -1 , 12.5 – 4.8 µm. | SPAC, 20m | LPAC, 512m. (F) Only foreign measurement: H 2 O + Air(  1.5atm)

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Progress in water vapour spectroscopy at RAL

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  1. Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010

  2. Plan for mid-IR measurements 800 – 2100 cm-1, 12.5 – 4.8 µm | SPAC, 20m | LPAC, 512m (F) Only foreign measurement: H2O + Air(1.5atm) F Foreign measurement: H2O + Air(1.5atm), in addition to the pure one

  3. LPAC measurements 512 m path length, 31 images High accuracy Baratrons & PRTs Room kept at 297 K Initial problems stable WV pressure

  4. LPAC Window problems

  5. LPAC Measurements Gauge Air Sample New water vapour injection system

  6. LPAC S/N Measurements 700 – 2100 cm-1 0.003 cm-1 resolution Set aperture for 1300 cm-1 LWP filter 1300 cm-10.006 cm-1 resolution

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