Abstract
A wavelength-independent, direct-reading radiometer has been developed to facilitate radiant power measurements in the near ultra-violet, visible and infra-red range. The sensor probe of the radiometer is designed to convert all incident radiant energy into heat, thereby providing a wavelength-independent method of light measurement. The amount of heat developed is measured with a specially designed `black-body' thermistor bolometer. The bolometer probe dimensions are less than 1 cm × 1 cm × 4 cm so that radiant power measurements can be made in confined areas. The instrument provides direct read-out of incident radiant power in units such as mw cm-2 or erg cm-2 sec-1. The instrument can be used over the range from less than 10-4 w cm-2 to more than 0.25 w cm-2. Depending on the type of window material used in the probe, the radiometer can provide wavelength-independent measurements from 250 nm to more than 40 μm.
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