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作 者:郭立功[1] 任立太 王金涛[1] 暴雪松[1] 佟林[1] 常旭 GUO Ligong;REN Litai;WANG Jintao;BAO Xuesong;TONG Lin;CHANG Xu(National Institute of Metrology,Beijing 100029,China;China Jiliang University,Zhejiang,Hangzhou 310018,China)
机构地区:[1]中国计量科学研究院,北京100029 [2]中国计量大学,杭州310018
出 处:《计量科学与技术》2024年第6期18-24,17,共8页Metrology Science and Technology
基 金:国家重大研发计划NQI专项项目(ZLJC1803);中国计量科学研究院基本业务费项目(AKYZZ2110)。
摘 要:为更好地实现肺功能仪用定标筒(以下称为定标筒)的量值溯源,开展了定标筒容量校准方法研究和校准装置研制。通过测量定标筒活塞杆缓缓抽出产生负压吸入称量筒内的纯水质量,以及测量开始、结束时称量筒和定标筒的大气的温度、湿度、压力等参数计算吸入的纯水体积V_(201),应用范德华方程计算开始、结束时的空气体积,计算体积之差得到容量测量结果的修正值ΔV,从而得到标准温度下定标筒的容量V20。对标称容量为1 L和3 L的定标筒进行容量测量,多组测量结果的重复性均小于0.06%,测量不确定度均小于0.1%(k=2)。与常规静力称量法容量测量结果的差值均在0.05%以内,证实定标筒容量校准装置的容量测量结果与常规静力称量法的容量测量结果等效。采用的容量校准方法和校准装置,满足对容量测量要求为重复性0.05%、允差为±0.5%的定标筒开展容量校准的要求;也将为密闭腔体容积校准规范的编写提供重要的技术支撑。To better realize the traceability of spirometer syringes used in spirometry,research on the method of calibrating the capacity of the syringes and the development of a calibration device have been conducted.The volume V20 of the syringes at standard temperature is obtained using the developed calibration device,which is calibrated on the negative pressure principle by measuring the mass of pure water inhaled into the weighing cylinder when the piston rod of the syringe is slowly withdrawn to generate negative pressure.The temperature,humidity,and pressure of the atmosphere in the weighing cylinder and calibration cylinder are measured at the beginning and end of the measurement.The volume of pure water drawn in is calculated as V_(201),the volume of air at the beginning and end of the measurement is calculated by applying the van der Waals equation,and the difference in volume is calculated to obtain a correction valueΔV for the volumetric measurement.The sum of V_(201)andΔV is V20.Volume measurements were carried out on syringes with nominal capacities of 1 L and 3 L.The repeatability of the results of several sets of measurements was less than 0.06%,and the measurement uncertainty was less than 0.1%(k=2).The difference between the volume measurement results and those of the conventional static weighing method was within 0.05%,confirming that the measurements of the calibrated device were equivalent to those of the conventional static weighing method.The calibration method and calibration device in this paper satisfy the requirements for carrying out capacity calibration for syringes with a capacity measurement requirement of 0.05%repeatability and a tolerance of±0.5%.They will also provide important technical support for the preparation of the calibration specification for the volume of confined cavities.
分 类 号:TB938.3[一般工业技术—计量学]
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