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Method of measuring the irradiance from powerful optical-radiation sources

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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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