阀盖与阀座是构成燃气表计量误差的主要因素，为定量评价燃气表阀气密性好坏，使用激光三角位移传感器扫描二维气浮平台上气阀工作面的表面轮廓，经高斯低通滤波后计算其表面粗糙度参数，以判断燃气表阀气密性合格与否。结果表明：合格与不合格燃气表阀表面粗糙度值存在较大差异，激光三角法测量结果与触针式粗糙度测量仪测量值也存在偏差，但不影响燃气表阀气密性合格与否的判断。通过测量燃气表阀表面轮廓可判断其气密性好坏，为定量评价燃气表阀合格与否提供了科学依据。%Valve bonnet and valve seat are the main factors that compose the metering error of gas meter. For evaluating the tightness of gas meter valve in a quantitative way, laser displacement sensor based on triangulation was applied to scan surface profile of the valve working face which was on the two-dimensional air floating stage. And then, surface roughness parameters were calculated through a Gaussian filter, which could judge the tightness of gas meter valve qualified or not. The results indicate that surface roughness has a big difference between the qualified and unqualified workpiece. Besides, there is a little deviation between the experimental value and the roughmeter measuring value, which has no impact on the testing result. The tightness of gas meter valve can be judged by measuring the valve surface profile, which provides a scientific basis for evaluating the quality of gas meter valve in a quantitative way.
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