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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 13 — May. 1, 1997
  • pp: 2776–2782

Coating techniques in optical interferometric metrology

J. J. J. Dirckx and W. F. Decraemer  »View Author Affiliations


Applied Optics, Vol. 36, Issue 13, pp. 2776-2782 (1997)
http://dx.doi.org/10.1364/AO.36.002776


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Abstract

In optical interferometry diffuse reflectivity of the surface under study should be high and homogeneous. Application of a white reflective coating can strongly improve measurement results. The optical properties of bronze powder, TiO2 powder, white Chinese ink, and MgO coatings are discussed. Measurements of reflected intensity distribution show that white Chinese ink and MgO have superior optical characteristics, and electron microscopy shows that these coatings cause thickness artifacts of less than 7.5 and 17 μm, respectively. The effect on deformation measurements is demonstrated by moiré topography on a thin membrane that is deformed under small static pressures. The membrane center displacement varies from 15 to 100 μm, and within a measuring precision of 2.5 μm no artifacts on this deformation are found.

© 1997 Optical Society of America

Citation
J. J. J. Dirckx and W. F. Decraemer, "Coating techniques in optical interferometric metrology," Appl. Opt. 36, 2776-2782 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-13-2776


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References

  1. J. Tonndorf and S. M. Khanna, “Tympanic membrane vibrations in human cadaver ears studied by time-averaged holography,” J. Acoust. Soc. Am. 52, 1221–1233 (1972).
  2. S. M. Khanna, Fowler Memorial Laboratory, Columbia University, New York, N.Y. 10032 (personal communication, 1996).
  3. J. J. J. Dirckx and W. F. Decraemer, “Human tympanic membrane deformation under static pressure,” Hear. Res. 51, 93–106 (1991).
  4. J. J. J. Dirckx, W. F. Decraemer, and G. Dielis, “Phase shift method based on object translation for full field automatic 3-D surface reconstruction from moire topograms,” Appl. Opt. 27, 1164–1169 (1988).
  5. K. S. Konradsson, A. Ivarsson, and G. Bank, “Computerized laser Doppler interferometric scanning of the vibrating tympanic membrane,” Scand. Audiol. 16, 159–166 (1987).

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