SIZE OF SOURCE EFFECT OF A TRANSFER REFERENCE THERMOMETER SUITABLE FOR INTERNATIONAL COMPARISONS NEAR TO ROOM TEMPERATURE

Yong Shim Yoo, Bong-Hak Kim, Chul-Woung Park, Dong-Hoon Lee, Seung-Nam Park

Abstract

We measured the size-of-source-effect (SSE) of a transfer reference thermometer (TRT) for the low-temperature mode with the spectral range from 8 µm to 14 µm by using the direct method. The measurements were carried out for various blackbody temperatures from 10 °C to 300 °C. The size of source changed from 10 mm to 80 mm in diameter. Taking the radiation from the masked area of the aperture plate and its surroundings into account, we observed that the SSE curves measured at various temperatures overlaps well. The SSE functions show a two-step saturation behaviour unusually. Excluding the data obtained near the room temperature, the values of the SSE functions agrees within 0.05 %.

Keywords

radiation thermometry, size of source effect, international comparison

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IMEKO-WC-2009-TC12-233.pdf

DOI

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IMEKO TC

TC12 - Temperature and Thermal Measurements

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