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Foken, T; Buck, AL; Nye, RA; Horn, R: D. A Lyman-alpha hygrometer with variable path length, J. Atmos. & Ocean. Techn, 15, 211-214 (1998)
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 only a short interruption of the measurements of 5 min or less. A description of the device, its operating specificationi, and an example of the calibration process are included.

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