| 摘要 |
A supersaturation hygrometer formed by a thermo-optical servo system which responds to water vapor changes in the range just above and below water saturation. The system includes a hydrophobic metal chip on which monodisperse submicron salt particles act as centers of water condensation. A change in scattered light from the solution droplets on the chip drives an infrared source which heats the chip to keep the size of the droplets constant. The infrared power is related to the chip ambient temperature difference which is proportional to the ambient water vapor pressure.
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