ZHANG Peng, ZHANG Yuan, JIN Guang, ZHONG Xing, ZHANG Lei, YAO Jin-song. Measurement of space membrane mirror shaping based on fringe projection[J]. Editorial Office of Optics and Precision Engineering, 2011,19(6): 1185-1191
ZHANG Peng, ZHANG Yuan, JIN Guang, ZHONG Xing, ZHANG Lei, YAO Jin-song. Measurement of space membrane mirror shaping based on fringe projection[J]. Editorial Office of Optics and Precision Engineering, 2011,19(6): 1185-1191 DOI: 10.3788/OPE.20111906.1185.
Measurement of space membrane mirror shaping based on fringe projection
In consideration of the inconvenience of dynamic measurement and the measuring limitation for surface shapes of mirrors in exciting measuring method
a shape measurement method based on sinusoidal fringe projection was proposed
and a test platform was built. Analysis and deduction indicates that the measurement uncertainty of the method is less than 0.385 m and that of the platform is less than 4.25 m. A standard spherical mirror was measured on this test platform to verify the feasibility of the platform. Finally
surface figures and surface figure errors of a
Ф
300 mm electrostatic stretching membrane mirror were measured with the proposed method and surface shape control algorithm.Results show that the measured values of center sag are consistent with theoretical ones. Furthermore
the RMS and PV values of shape surface are 5.214 m and 39.327 m
which has reduced about 30.17% and 23.7%
respectively.The results display that the shape measurement platform based on sinusoidal fringe projection meets the need of membrane mirrors for shape measurement and the membrane mirror surface shape control algorithm can control the membrane mirror to obtain the required surface shape and improve the surface accuracy.
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references
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