A meter for ultraviolet dose and irradiance

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Abstract
A compact, portable, battery-powered meter has been developed to monitor and to integrate ultraviolet irradiance. The meter has been designed to accept signals from either a thermopile or a solid-state (GaAsP) diode detector. A variable scale factor is provided to accommodate a range of different detector sensitivities. The measurable irradiance range is 100 mu W cm-2 to 100 mW cm-2 and that of dose is 200 mJ cm-2 to 200 J cm-2. The meter can be operated manually or for a range of preset times. The irradiance, dose and elapsed times are displayed. Outputs from the preamplifier and from the scaling amplifier are available for interfacing the instrument with a computer or chart recorder. The meter has been designed to have an overall measurement uncertainty of the order of 1% in order to ensure that the major error contribution lies with the detecting devices.

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