Improvement of melting and freezing curves for fixed-point calibration of a transfer reference thermometer by size-of-source-effect correction

Autor:	Bong-Hak Kim, Yong Shim Yoo, Seung-Nam Park, Chul Woung Park
Rok vydání:	2010
Předmět:	Range (particle radiation) Materials science business.industry General Engineering chemistry.chemical_element Field of view Fixed point Signal Optics chemistry Thermometer Calibration Black-body radiation business Tin
Zdroj:	Metrologia. 47:561-566
ISSN:	1681-7575 0026-1394
Popis:	The size-of-source effect (SSE) of a radiation thermometer is a critical uncertainty component in the fixed-point blackbody calibration of a transfer reference thermometer in the low-temperature range where the field of view is comparable to the size of the blackbody cavity opening. The SSE causes the signal difference between the melting and freezing plateaus to increase, and steepens the slopes of the plateaus. We propose a new method that can recover the signals of the melting and freezing curves that are deteriorated by the SSE, and thereby flatten the plateaus. The improvement has been successfully demonstrated using a tin-point blackbody. The signal difference between the melting and freezing plateaus was reduced from 81 mK to 18 mK, and the freezing-point signal was corrected by 1.30 K. In addition, the slopes on the plateaus have been dramatically flattened.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a924c7a8a8af676e3da30db828f4b8d4 https://doi.org/10.1088/0026-1394/47/5/006 Zobrazit plný text záznamu