摘要
混合气体的组分变化将对热式流量计的输出造成一定影响,这是该类流量计在工程应用中的难题.本文从定温热式气体流量计的基本公式出发,结合电路结构,推导了热式流量计在不同气体组分条件下使用时输出信号之间的关联方程,定义了补偿系数.并提出利用补偿系数在流量计标定数据的基础上,进行组分补偿的方法和过程.将该补偿策略分别应用于S IERRA热式流量计以及自行设计的热式气体流量计样机,给出了其在现场煤气流量测量中的实验结果,验证了该补偿策略的有效性和实用性.
The component variation of gas mixture definitely brings measurement errors to the thermal flow meters （TFM）, which results in a difficult problem for the applications of TFM. The relation equations for the outputs of TFM subject to different components are deduced and a compensation coefficient is defined. They are based on the theoretical equations of constant temperature TFM and its circuitry structure. The compensation strategy and compensation procedure are also proposed, based on the compensation coefficient and the calibration data of TFM. This strategy is applied to a commercially available SIERRA TFM and a TFM prototype developed by the authors respectively. The validity and practicability of this compensation strategy are evidenced by the field experiments.
出处
《测试技术学报》
2009年第4期307-312,共6页
Journal of Test and Measurement Technology
关键词
热式流量计
组分补偿
混合气体
补偿系数
物性参数
thermal flow meter
component compensation strategy
gas mixture
compensation coefficient
physical property parameter
