The flow head of an orifice-type capacitive flow sensor for a conducting liquid consists of a vertically mounted metallic orifice plate in a horizontal pipeline made of insulating material and a rigidly grounded metallic ring or sensing ring placed surrounding the pipeline at a small distance from the orifice plate where the capacitance between the orifice plate and the sensing ring follows a linear relationship with flow rate as reported in the literature. In this paper, a further study on the effect of position of the sensing ring on the sensor capacitance has been carried out along with the modification of the simple parallel plate capacitance principle described in the earlier work by the real disk-type capacitance principle. From this paper, it has been observed that for any position of the sensing ring near the orifice plate, the sensor capacitance decreases linearly with the increase of flow rate and follows the modified capacitance principle similarly as that observed in earlier work. It has also been observed that the sensing ring distance-sensor capacitance product increases almost linearly with the increase of sensing ring distance. From the experimental study of the proposed orifice type capacitive flow sensors installed on two different pipelines, the said modified theory of the sensor appears to be verified in the present paper where the experimental results are reported.

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孔板式电容流量传感器传感环位置的进一步研究

用于导电液体的孔板式电容式流量传感器的流量头由垂直安装在由绝缘材料制成的水平管道中的金属孔板和围绕管道放置的与管道保持一小段距离的刚性接地金属环或传感环组成。孔板，其中孔板和传感环之间的电容与文献中报道的流速呈线性关系。在本文中，随着真实盘式电容原理对早期工作中描述的简单平行板电容原理的修改，进一步研究了传感环的位置对传感器电容的影响。从本文中可以看出，对于靠近孔板的传感环的任何位置，传感器电容随着流速的增加线性减小，并遵循与早期工作中观察到的类似的修正电容原理。还观察到传感环距离-传感器电容乘积随着传感环距离的增加几乎呈线性增加。从安装在两条不同管道上的孔板式电容流量传感器的实验研究来看，所述传感器的改进理论似乎在报告实验结果的本文中得到了验证。还观察到传感环距离-传感器电容乘积随着传感环距离的增加几乎呈线性增加。从安装在两条不同管道上的孔板式电容流量传感器的实验研究来看，所述传感器的改进理论似乎在报告实验结果的本文中得到了验证。还观察到，传感环距离-传感器电容乘积随着传感环距离的增加几乎呈线性增加。从安装在两条不同管道上的孔板式电容流量传感器的实验研究来看，所述传感器的改进理论似乎在报告实验结果的本文中得到了验证。