Abstract: A hygrometer capable of making in situ humidity measurements with good accuracy and excellent time-space resolution is described. Based on the absorption of Lyman-alpha radiation by water vapor, the instrument uses a ...

Abstract: Equations are presented which relate saturation vapor pressure to temperature for moist air. The equations are designed to be easily implemented on a calculator or computer and can be used to convert in either direction. ...

Abstract: A new cryogenic hygrometer designed for airborne research has been developed. It is based on the well-known chilled-mirror technique, but instead of the usual Peltier elements, liquid nitrogen is used for mirror cooling. ...

Abstract: A novel design of a Lyman-alpha hygrometer for surface layer flux measurements is presented using a variable pathlength. The benefit of this device is the capability for in situ calibration during a field experiment with ...