This standard specifies the measurement method for measuring the surface waviness of flat panel display substrate glass using a stylus type surface roughness measuring instrument. This standard is applicable to measuring the surface waviness of substrate glass for flat panel displays. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 32642-2016 Measurement Method for Surface Roughness of Glass on Flat Panel Display Substrates 3 Terms and Definitions The terms and definitions defined in GB/T 32642-2016 and the following apply to this document. 3.12CR filter A filter connected in series with two sets of R-C circuits with equal time constants. The standard transmission rate at the cutoff wavelength is 75%. 3.2 Gaussian phase correct filter takes the Gaussian distribution as the weight function, and specifies the integrated curve in the cross-section curve as the phase compensated filter ripple curve. The transmission rate at the cutoff wavelength is 50%. 3.3 Pre travel (and post travel) Lp The portion subtracted from the tracer length to avoid profile distortion caused by the transient response of the cut-off filter. Note: It is recommended to use a 2CR filter at the beginning of the tracer length stage and without a back stroke, with a pre stroke of 2 times the cutoff wavelength; It is recommended that when using a phase correction filter, both the pre stroke and post stroke should be the same as the cutoff wavelength input. 3.4 Measure the evaluation length L. A trace length after deducting pre stroke and post stroke. The length of the measured sample should include the length of the profile curve for waviness. 3.5 Long wavelength cutoff. Excluding natural factors, when the tracer profile curve passes through a high pass wavelength filter that eliminates the influence of ripple factors, the amplitude attenuation rate becomes 75% of the wavelength
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