光栅与光电开关在被动体积管流量标准装置中的组合运用

Grating and Optical Switch Combination Using in a Passive Volume Prover Flow Standard Devices

本文针对采用光电开关方式定容积的被动式体积管装置在测量小流量时效率不高的问题,在项目装置设计中,采用光电开关与光栅结合的方式进行容积测量:用光电开关进行大流量段的容积测量;用光栅进行小流量段的容积测量.两种容积测量方式的组合,不仅保证了被动式体积管在测量大流量时有足够的稳定段进行容积快速测量,而且在测量小流量时,可以通过改变累积容量来缩短测量时间.光栅与光电开关在被动式体积管流量标准装置中的组合运用,在相同测量不确定度的情况下,不仅提高了装置的工作效率,还扩大了装置的工作量程.此外本文还提出了被动式体积管运行阶段划分的概念,为如何设定光电开关位置,何时开始采集数据提供了参考依据.

In connection with the low efficiency problem of SVP（small volume prover）with optical switches which was used in the low flow calibration.We used a combination method of optical switches and grating to measure volume in the flow standard.Optical switches were used in the large flow measuring;grating was used in the low flow measuring.Combination of the two volume measurement methods,not only ensured sufficient volume stable segments in the large flow,but also greatly improved the measurement efficiency about an order of magnitude by changing the cumulative volume.Grating and optical switches combination used in the SVP with the same measurement uncertainty,not only improved the efficiency of the device,but also expanded the range of the device work.In addition,the paper also putted forward the concept of SVP running phasing concept which provided a reference for how to set the photoelectric switch positions and when beginning to sample data.