Abstract
This paper proposes a method of measuring the irradiance from powerful optical-radiation
sources, based on heating a solid-state radiation element, after which a photoelectric method is
used to record the flux re-emitted by the element. The spectral range in which the
secondary flux is recorded is chosen in a region where the emissivity of the material of the
element is independent of temperature. A prototype of the measurement device has been developed.
Comparative measurements of the irradiance in the 10– 100-W/cm2 range from a continuous
electric-arc source (a dismountable-metal xenon lamp with a power of 55 kW), using the prototype
and a disk graphite calorimeter, showed satisfactory agreement of the results. The
measurement error is about 10%.
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