LIU Man-lin, YANG Wang, XUE Wei-cai. Calibration of measuring error caused by interferometric imaging distortion[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2349-2354
LIU Man-lin, YANG Wang, XUE Wei-cai. Calibration of measuring error caused by interferometric imaging distortion[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2349-2354 DOI: 10.3788/OPE.20111910.2349.
Based on the wavefront aberration theory and interferometric theory
the influences of imaging distortion in an interferometer on measuring results are analyzed and calibration and correction methods for the imaging distortion are proposed. The measurement errors caused by misalignments of the test surface (tip/tilt and disfocus) are discussed mainly. An experiment is carried out to measure the same surface under different number of fringes. The test results show that the surface shapes are 30.96 nm PV and 6.32 nm RMS for 3 fringes
and 41.25 nm PV and 8.22 nm RMS for 10 fringes
respectively. After the calibration
the difference of the results are declined to 1.42 nm PV and 0.4 nm RMS. The experiment proves that the calibration solution referred in this paper can improve the measurement accuracy.
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