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- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 definition "Hygrometers measure water. Some measure water vapor content, some measure liquid water. The NOAA Lyman-alpha Total Water Hygrometer measures the amount of all water that enters the sensor, be it in any form-- solid, liquid or gas. The instrument ionizes the water molecules themselves as they pass through. Using a high intensity direct current discharge lamp, light at 121.6nm (called Lyman-alpha light) photodissociates water molecules producing excited OH radicals. Fluorescence is produced as the OH radical emits photons at 309nm. Making use of a phototube sensitive to this wavelength and a counter, the amount of OH can be calculated. The ambient air in the sample diminishes this signal by an amount proportional to the mixing ratio, so knowing the ambient pressure and temperature yields the mixing ratio from which the total water is determined. The instrument is periodically calibrated in flight by injecting a known amount of water vapor directly into the sample. Additional information available at 'http://ghrc.msfc.nasa.gov/uso/readme/c4enlh.html'" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 id "1654612" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_id 2ac83116-414b-44ce-a075-eb65f42e8232 @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_id bb5a51d9-0ded-40ed-9bfd-7cb0e788f1a5 @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_id ff564c87-78f2-47eb-a857-a4bdc0a71ae5 @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_label "Hygrometers" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_label "In Situ/Laboratory Instruments" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_label "Instruments" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 path_label "Temperature/Humidity Sensors" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 prefLabel "FPH" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 reference "" @default.
- 46a7ac7c-61e2-42d2-bffb-a55b306eefe8 tag "Instruments" @default.