肺功能仪用定标筒容量校准方法

Method for Volume Calibration of Spirometer Syringes

提出一种以静力称重法为基础并结合负压原理的肺功能仪用定标筒(以下称为定标筒)容量校准方法,设计了定标筒容量校准装置。校准时,定标筒活塞杆拉出,定标筒内形成负压,在压力作用下介质(纯水)进入称量筒;采集环境大气压力、介质质量和温度等数据;计算出20℃时定标筒的容量。根据定标筒容量测量原理,建立其容量测量模型。实测某个定标筒,其容量为3.00196 L的定标筒,测量结果的不确定度为9.6×10^(-4)(k=2)。分析表明,该装置具有可靠性,可实现快速校准并满足定标筒容量校准要求。

A volume calibration method of spirometer syringes(hereinafter referred to as syringes)based on hydro-weighting method and combined with negative pressure principle is presented,and a calibration device for the volume of syringes is designed.During calibration,the medium(pure water)is pumped into the weighing cylinder by the negative pressure formed in syringes when the piston of syringes is pulled out.From the collected data such as ambient atmospheric pressure,medium mass and temperature,the capacity of syringes is calculated at 20°C.The volume measurement model is developed according to the volume measurement principle of syringes.The measured volume of a syringe is 3.00196 L,and the uncertainty of measurement result is 9.6×10^(-4)(k=2).The research shows that the device meets the requirements of syringes capacity calibration and can realize rapid calibration.