Fig. 5
From: Mid-spatial frequency error generation mechanisms and prevention strategies for the grinding process
Amplitude frequency spectrum (0.4 1/mm < spatial frequency < 3.4 1/mm) of the same sample as displayed in Fig. 5 after polishing. The surface error is displayed as spatial frequencies (1 / mm) and the amplitude is given in nanometres. The frequency peaks are labelled (a, b, c, d, e, and f) according to Table 2. Fourier transformation: Normalized, unity window