Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL,...
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Transcript of Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL,...
![Page 1: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/1.jpg)
Progress in water vapour spectroscopy at RAL
Dr Robert McPheatCAVIAR Progress Meeting
NPL, 29/09/2010
![Page 2: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/2.jpg)
Plan for mid-IR measurements
800 – 2100 cm-1, 12.5 – 4.8 µm
Saturated PH2O (mb) !
T (K) P (mb) P (mb)
13.8 285 ? 10F
19.1 290 10, 15F 27.8 296 20(F) 10, 15F, 20
62 310 50 20(F)
No Argon steps are needed for LPAC measurements
135 325 100 20(F)
270 340 100, 150, 200
510 355 100, 150, 200, 350
Resolution (cm-1):
N of scans:
0.01 0.02 | 0.05
0.003
? (to ensure good S/N)
| 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
![Page 3: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/3.jpg)
LPAC measurements
512 m path length, 31 imagesHigh accuracy Baratrons & PRTsRoom kept at 297 KInitial problems stable WV pressure
![Page 4: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/4.jpg)
LPAC Window problems
![Page 5: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/5.jpg)
LPAC Measurements
New water vapour injection system
Sample
Gauge
Air
![Page 6: Progress in water vapour spectroscopy at RAL Dr Robert McPheat CAVIAR Progress Meeting NPL, 29/09/2010.](https://reader033.fdocuments.us/reader033/viewer/2022051516/56649d565503460f94a34767/html5/thumbnails/6.jpg)
LPAC S/N Measurements
700 – 2100 cm-1 0.003 cm-1 resolution Set aperture for 1300 cm-1 LWP filter 1300 cm-1 0.006 cm-1 resolution