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Progress in water vapour spectroscopy at RAL

Progress in water vapour spectroscopy at RAL. Dr Robert McPheat CAVIAR Progress Meeting Cambridge, 19/02/2011. 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 Cambridge, 19/02/2011

  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 Measurements 14.25 hPa water vapour Wavenumber / cm-1

  7. LPAC Temperature Calibration T = 1.0040596 Tprt + 0.22685440 TLPAC / °C TSPRT / °C

  8. LPAC Temperature Calibration TLPAC = 1.0040596 × TSPRT + 0.22685440 LPAC PRTs Std. Dev. Corrected LPAC temperature - TSPRT Days

  9. LPAC Humidity Calibration

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