新一代的温度固定点.pdf

31 1 Vol.31　No.1 　2005 1 CHINA EASURE ENT TECHNOLOGY Jan, 2005 　　　　　 李言于谟, 赵明坚, 陈德明 (Hart Scientific, Inc, USA) 　:。 , , , , 。, 、, , 。, , 0.0001℃。,、、, 0.001℃～0.005℃。 :;;;; :TB942　　　　:A　　　　:1672-4984(2005)01-0006-04 New generation of fixed points LIXu-mo, ZHAO ing-jian, CHEN De-ming (Hart Scientific, Inc., USA) Abstract:In this paper,the new techniques toimplement new generation of fixed points are reported.Comparedwith thetraditional techniques, the new techniques have some obvious advantages in their architectures, easy operating as well as high efficiency, and areespecially suitableto verification for both the second class and industrial thermomenters.A new recurrence method of triple- point ofwater,without using cold-producingmedium likeliquid nitrogen and dry iceetc., can form three-phaseequilibrium ofwater automatically and makes it maintain a few ten hours.The recurrence set of the melting point of Ga, shelled by stainless steel, can provide amelting plateau that lasts a week and uncertainty of 0.0001℃.The frezzing points of pure metals for the second class calibration, including In, Sn,Zn and Al, have uncertainties between 0.001℃and 0.005℃. Key words:Fixed point;Temperature;casmement;Calibition;Umcertainty 1　　 , , , ,, , ,。 。 , , , 。 , , , ,( 。, , )。 , 。 2　 ,,,, , 。450mm 。 。,