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A Two-Dimensional Surface Profile Imaging Technique Based on Heterodyne Interferometer

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Abstract:

A two-dimensional surface profile imaging technique based on heterodyne interferometer is proposed. A piezo translator vibrated grating is used to generate a heterodyne signal. A high speed CCD camera is used to extract the interference signal using a five step method. The uncertainty in the displacement measurement is approximately 0.035 µm within a measurement range of 1.7 µm, confirming the two dimensional heterodyne interferometer is valid for measuring the surface profile. The method is also available for low coherence heterodyne interferometer due to the optical frequency shifts caused by the vibration of grating independent on the wavelength.

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Periodical:

Key Engineering Materials (Volumes 295-296)

Pages:

477-482

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.295-296.477

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Online since:

October 2005

Authors:

K.W. Wang, Z.J. Cai, Li Jiang Zeng

Keywords:

Grating, Heterodyne Detection, Interferometric Imaging, Surface Profile

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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