WEI Jin-cheng, DU Huan-yong, XU Sha-sha, et al. Development and implementation of trace gas volume fraction testing method[J]. 2011, 30(4): 28-30. DOI: 10.13873/j.1000-97872011.04.007.
An advanced testing method for trace gas volume fraction
based on the ultrasonic theory and CPLD technology is described.It is used in gas insulated switch(GIS)-site.It can help to design and accomplish a primary test method.To take a further step
an advice is given on improved method of relative phase lag method
on the basic of analyzing the calculation formula for volume fraction of binary gas.Experimental results show that the method has the advantage of low cost
high precision and easy to operate than traditional way
and overcomes some troubles in normal test such as complex circuit design
environmental influences
awkward compensation density.Due to these advantages
this method has high value and wide application in industrial control fields.