Improved synthetic-heterodyne Michelson interferometer vibrometer using phase and gain control feedback

Applied Optics
José Henrique GaletiMichael J Connelly

Abstract

Synthetic-heterodyne demodulation is a useful technique for dynamic displacement and velocity measurement using interferometric sensors as it can provide an output signal which is immune to interferometric drift. With the advent of cost effective, high-speed real-time signal processing systems and software, processing of the complex signals encountered in interferometry has become more feasible. In conventional synthetic-heterodyne demodulation schemes, to obtain the dynamic displacement or vibration of the object under test requires knowledge of the interferometer visibility and also the argument of two Bessel functions. In this paper, a new synthetic-heterodyne demodulation method is described leading to an expression for the dynamic displacement and velocity of the object under test that is significantly less sensitive to the received optical power. In addition, the application of two independent phase and gain feedback loops is used to compensate for the nonideal gain and phase response of the anti-aliasing filter required for the signal acquisition of the received wideband interferometer signal. The efficacy of the improved system is demonstrated by measuring the displacement sensitivity frequency response and linearity of...Continue Reading

References

Oct 3, 2013·Applied Optics·José Henrique GaletiEmílio Carlos Nelli Silva
Jan 7, 2014·The Review of Scientific Instruments·Hans-Jürgen von Martens
Jul 21, 2015·Applied Optics·Michael J ConnellyCláudio Kitano

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