利用3种不同的滤波器对汽车板表面波纹度进行测量，通过与标准样板进行对比，对不同的评价长度和测试速率下的试验结果进行了比较和分析。结果表明：用2RC滤波器得到的波纹度受评价长度的影响很大，评价长度越大，波纹度越大；用指数滤波器得到的波纹度轮廓中高频分量相对较少，随着评价长度的增大，波纹度有所减小；用λ_c=0.8 mm、高斯滤波器以及5级多项式回归得到的W_a0.8-8及W_a0.8波纹度轮廓中，含有较少的高频分量，评价长度越大，波纹度越大；在一定的速率范围内，测试速率对波纹度W_sa测量值的影响较小。

The surface waviness of the automobile plate was measured by three different filters, by comparing with the standard sample blocks, the test results were compared and analyzed with the different evaluation lengths and test rates. The results show that the waviness contour obtained by 2RC filter was greatly influenced by the evaluation length, the longer the evaluation length was, the greater the waviness was. The high-frequency component in the waviness contour obtained by exponential filter was relatively small, with the increase of evaluation length, the waviness decreased. The W_a0.8-8 and W_a0.8 waviness contour obtained by λ_c=0.8 mm, Gaussian filter and 5 stage polynomial regression contained less high-frequency components, and the longer the evaluation length, the greater the waviness. Within a certain speed range, the influence of test rate on the measurement value of waviness W_sa was small.