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- fe1fa30a-adc4-4019-a176-f471e4f8f49c definition "Laser hygrometers measure the amount of water vapor directly via absorption of laser light. If the initial strength of the laser and the path length through which it travels is known, measuring the diminution of its intensity will give an indication of the amount of water vapor present. The JPL Laser Hygrometer uses this principle in an open-path instrument; that is, the laser path is in the free stream passing by the aircraft. A tunable diode laser operating at 1.37mm is mounted in a window blank (an aluminum panel which replaces the passenger window) on the port side of the NASA DC-8. The laser and detector are mounted on a circular aluminum disk in the upper rectangular 'arm' of the instrument. Exactly 25cm away is a 0.5 inch diameter mirror from which the laser beam is reflected. This gives a path length of 50cm- from the laser, down to the mirror and back to the detector. The length of the arms insures that the instrument is well outside the boundary layer of the aircraft minimizing effects of the aircraft itself upon the measurements. Additional information available at 'http://ghrc.msfc.nasa.gov/uso/readme/c4djlh.html' [Summary provided by Global Hydrology Resource Center]" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c id "1655849" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_id 46238695-5577-4fad-91bf-0a2fdf8a9b19 @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_id 93e67fc7-3a57-4cf0-a0f9-7f76cded167c @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_id c8fe757b-b530-4d67-a553-e4903f4430a5 @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_label "Active Remote Sensing" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_label "Earth Remote Sensing Instruments" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_label "Instruments" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_label "Lidar/Laser Spectrometers" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c path_label "Spectrometers/Radiometers" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c prefLabel "JPL LASER HYGROMETERS" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c reference "" @default.
- fe1fa30a-adc4-4019-a176-f471e4f8f49c tag "Instruments" @default.