计数器在主动式体积管流量标准装置中的应用

Application of Counter in Active Volume Tube Flow Standard Device

针对主动式体积管流量标准装置中光栅卡性能不稳定有时无法锁存数据的问题,提出使用计数器代替光栅卡进行标准体积值测量的方法。主动式体积管使用光栅尺作为测量标准器,根据光栅尺信号的特点,采用双计时法实现光栅尺信号采集;通过自制同步电路与ADAM4080计数器搭配使用,解决了信号采集丢失脉冲的问题,确保了流量测量的准确性。经对比实验证明,本文研制的系统与原系统的标准流量采集误差小于0.005%,验证了该方案的可行性。

In order to solve the problem that the performance of the grating card in the active volume tube flow standard device is not stable and sometimes the data cannot be locked,a method of measuring the standard volume value by using a counter instead of the grating card is proposed.The active volume tube uses grating ruler as the measurement standard.According to the characteristics of grating ruler signal,double timing method is adopted to realize grating ruler signal acquisition.The problem of missing pulse in signal acquisition is solved by using the self-made synchronous circuit and ADAM4080 counter,which ensures the accuracy of flow measurement.The experimental results show that the difference between the developed system and the original system in standard flow collection is less than 0.005%,which verifies the feasibility of the scheme.