Solar UV measurements with Robertson–Berger type instruments: influence of the detector’s internal humidity status

Measuring ultraviolet (UV) radiation is an intrinsic part of undertaking an UV effect study, but the science of UV measurement is not usually the main interest of the plant scientist. Nonetheless, if the UV measurement is not carefully calibrated and characterized then the trial results may be misleading, or unrealistic in terms of what might be expected from ozone depletion. This paper discusses the various methods of measuring UV radiation, and their applicability for field and forest research.