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Proceedings Paper

Real-time phase demodulation of heterodyne speckle interference patterns using correlation image sensor
Author(s): Akira Kimachi
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Paper Abstract

A real-time method for heterodyne speckle pattern interferometry using the correlation image sensor (CIS) is proposed. The CIS demodulates the interference phase of heterodyned speckle pattern waves from a singleframe set of temporal correlation images between the beat signal of incident light and three-phase sinusoidal reference signals at each pixel at an ordinary video frame rate. The proposed method does not suffer loss of spatial resolution or decrease in signal-to-noise ratio that would happen for a high-speed image sensor. In-plane and out-of-plane deformation measurement systems are developed with a 200 × 200-pixel CIS camera. The experimental results obtained on these systems show good linearity of the change in speckle interference phase to the voltage applied to a piezoelectric actuator that moves the object.

Paper Details

Date Published: 3 August 2010
PDF: 8 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779007 (3 August 2010); doi: 10.1117/12.859391
Show Author Affiliations
Akira Kimachi, Osaka Electro-Communication Univ. (Japan)


Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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