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26 November 2001 Multi-axis interferometer system for vibration measurement with oblique angles
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This paper reports an experiment that demonstrated the functionality of a commercial heterodyne interferometer with an oblique-angle fold mirror in the laser feed path. The key issue investigated is whether the oblique angle fold mirrors introduce unacceptable levels of polarization mixing. The manufacture's specifications recommend that only orthogonal fold mirrors be used to control polarization mixing. However, this constraint limits the use of the interferometer for applications such as the measurement of structural dynamics. In the experiment, an orthogonally-fed interferometer was compared to an oblique angle interferometer at roughly 45°. The result indicated a linear relationship between the two measurements to within 0.5 percent. As a result, no evidence of the λ/2 wavelength sinusoidal bias characteristic of polarization mixing errors was found. A 9 percent error did however exist between the intended and observed scaling between the two measurements. While hardware alignment errors are a likely cause of this disagreement, a third axis of measurement is recommended for future investigations.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew Vellone, Lisa M. R. Hardaway, Jason D. Hinkle, and Lee D. Peterson "Multi-axis interferometer system for vibration measurement with oblique angles", Proc. SPIE 4448, Optical Diagnostics for Fluids, Solids, and Combustion, (26 November 2001);

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