基于双速度探头的微小流量热式气体流量计
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摘要
针对传统热式流量计测量微小流量精度不高的问题,基于对流换热原理,采用2个参数一致的铂热电阻获取流量信号的方法,研制了一种双速度探头热式流量计。分析了流量测量原理以及环境温度补偿,简述了铂热电阻加工工艺,拟合建立了流量测量函数关系式。流量计在音速喷嘴气体流量标准装置上实验的结果表明该方法可实现对微小流量的测量。
Aiming that traditional thermal flowmeter can't measure micro flow accuracy, a dual speed probes thermal flowmeter was developed based on convection heat transfer principle,which used two platinum resistances with same parameters to acquire the signal of flow rate.The measurement principle and temperature compensation were analyzed,the platinum resistance process was briefly described and the function equation was proposed.Flowmeter was tested on standard device for gas flow rate of sonic nozzle.Experiments show that the flowmeter can effectively measure the micro flow.
Aiming that traditional thermal flowmeter can't measure micro flow accuracy, a dual speed probes thermal flowmeter was developed based on convection heat transfer principle,which used two platinum resistances with same parameters to acquire the signal of flow rate.The measurement principle and temperature compensation were analyzed,the platinum resistance process was briefly described and the function equation was proposed.Flowmeter was tested on standard device for gas flow rate of sonic nozzle.Experiments show that the flowmeter can effectively measure the micro flow.
引文
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[2] ASHHAB M S,AL-SALAYMEH A.Optimization of hot-wire thermal flow sensor based on a neural net model [J].Applied Thermal Engineering,2006,26(8-9):948-955.
[3] 文小玲,刘翠梅,易先军,等.铂电阻测温的非线性补偿算法分析[J].传感器与微系统,2009,28(8):33-36.
[4] 梁国伟,王芳,郑永军,等.基于热传递铂膜气体流量计实验研究[J].中国计量学院学报,2006,17(1):36-39.
[5] 徐英,吴海涛,张涛.基于可调恒流源技术的热式气体质量流量计[J].传感器与微系统,2016,35(5):64-66.
[6] 顾宇,叶寒生,冯超,等.一种恒功率热式气体流量计温度补偿实现[J].仪表技术与传感器,2015(10):38-39.
[7] 修吉平,魏华胜,南海,等.热导式智能气体流量测量仪的研究与应用[J].中国机械工程,1995(6):38-39.
[8] 汪余景,翟军勇.基于恒温差的热式空气流量计[J].仪表技术与传感器,2017(6):41-43.
[9] 王安敏,孟海彦,李锋,等.基于ADS1248的铂电阻高精度测温装置[J].仪表技术与传感器,2017(9):52-54.
[10] 王俊杰,张伟.最小二乘法在铂热电阻测温中的应用[J].仪表技术与传感器,1999(5):35-36.