一体化湿度校准装置的研制
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摘要
介绍一体化湿度校准装置的原理、实现方法和性能特点。根据分流法原理研制湿度发生单元,根据露点法原理研制湿度控制单元,通过软硬件系统实现闭环控制,组成一体化的湿度校准装置。对其测量不确定度进行了评定,在露点–50~20℃范围内,扩展不确定度U=0.3℃(k=2);在露点–70~–50℃范围内,扩展不确定度U=0.5℃(k=2)。该装置具有自动化程度高、量值准确可靠、平衡时间短、便于移动或携带等特点,能够扩展分流法湿度发生器的应用领域。
The principle,realization method and performance characteristics of the integrated humidity calibration device were introduced. Humidity generating unit was developed by adopting the method of dividing flow,the humidity control unit was developed by the dew point method,and the closed loop control was realized by the software and hardware system. An integrated humidity calibration device was obtained. The uncertainty of measurement of the device was evaluated. The expanded uncertainty was U=0.3℃(k=2) for dewpoint in the range of –50–20℃, and U=0.5℃(k=2) for dewpoint in the range of –70– –50 ℃. The device has the characteristics of high degree of automation,accuracy,reliability,short balance time,easy to move or carry,so it can expand the application of the divided flow humidity generator,and improve the working efficiency of the humidity measurement personnel.
The principle,realization method and performance characteristics of the integrated humidity calibration device were introduced. Humidity generating unit was developed by adopting the method of dividing flow,the humidity control unit was developed by the dew point method,and the closed loop control was realized by the software and hardware system. An integrated humidity calibration device was obtained. The uncertainty of measurement of the device was evaluated. The expanded uncertainty was U=0.3℃(k=2) for dewpoint in the range of –50–20℃, and U=0.5℃(k=2) for dewpoint in the range of –70– –50 ℃. The device has the characteristics of high degree of automation,accuracy,reliability,short balance time,easy to move or carry,so it can expand the application of the divided flow humidity generator,and improve the working efficiency of the humidity measurement personnel.
引文
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[14]张文东,张勇.宽温压力可变标准湿度发生器的研制[J].计量学报,2012(7):326–330.
[2]易洪,孙国华,李占元,等.低霜点湿度检测标准装置的研制[J].陶瓷学报,2008(9):301–304.
[3]国防科工委科技与质量司.化学计量[M].北京:原子能出版社,2002.
[4]崔剑,张学范,辛宗伟,等.一种多路外渗式湿度发生器的研制[J].计测技术,2006,26(增刊):77–80.
[5]JJF 42–2013分流式湿度发生器校准规范[S].
[6]Mamontov G.Mendeleyev Institue for Metrology(VNIIM).Extension of the Frost-Point Temperature Range of the Standard Humidity Generator down to–120℃[C]//in Proceedings of 4th ISHM 2002.Taipei:ITRI,2002:17–24.
[7]JJF 1059.1–2012测量不确定度评定与表示[S].
[8]JJG 499–2004精密露点仪检定规程[S].
[9]黄继昌,徐巧鱼,张海贵,等.传感器工作原理及应用实例[M].北京:人民邮电出版社,1998.
[10]施仁.自动化仪表与过程控制[M].北京:电子工业出版社,1994.
[11]徐德胜.半导体制冷与应用技术[M].上海:上海交通大学出版社,1992.
[12]陈焕生.温度测试技术及仪表[M].北京:水利出版社,1987.
[13]马忠梅,等.单片机的C语言应用程序设计[M].北京:北京航空航天大学出版社,2007.
[14]张文东,张勇.宽温压力可变标准湿度发生器的研制[J].计量学报,2012(7):326–330.