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

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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 Saturated P H2O (mb) ! T (K)P (mb) ? 10 F , 15 F (F) 10, 15 F, (F) No Argon steps are needed for LPAC measurements (F) , 150, , 150, 200, 350 Resolution (cm -1 ): N of scans: | ? (to ensure good S/N) | SPAC, 20m | LPAC, 512m (F) Only foreign measurement: H 2 O + Air(  1.5atm) F Foreign measurement: H 2 O + Air(  1.5atm), in addition to the pure one

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

LPAC Window problems

LPAC Measurements New water vapour injection system Sample Gauge Air

LPAC S/N Measurements 700 – 2100 cm cm -1 resolutionSet aperture for 1300 cm -1 LWP filter 1300 cm cm -1 resolution