Widefield heterodyne interferometry using a custom CMOS modulated light camera.
- 15 November 2011
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 19 (24), 24546-24556
- https://doi.org/10.1364/oe.19.024546
Abstract
In this paper a method of taking widefield heterodyne interferograms using a prototype modulated light camera is described. This custom CMOS modulated light camera (MLC) uses analogue quadrature demodulation at each pixel to output the phase and amplitude of the modulated light as DC voltages. The heterodyne interference fringe patterns are generated using an acousto-optical frequency shifter (AOFS) in an arm of a Mach-Zehnder interferometer. Widefield images of fringe patterns acquired using the prototype MLC are presented. The phase can be measured to an accuracy of ±6.6°. The added value of this method to acquire widefield images are discussed along with the advantages.Keywords
This publication has 15 references indexed in Scilit:
- Multi-frequency Phase Unwrapping for Time-of-Flight camerasPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010
- Heterodyne interferometer for displacement measurement with amplitude quadrature and noise suppressionOptics Communications, 2007
- Real-time phase-front detector for heterodyne interferometersApplied Optics, 2007
- Real-time heterodyne imaging interferometry: focal-plane amplitude and phase demodulation using a three-phase correlation image sensor.Applied Optics, 2007
- Angstrom-range optical path-length measurement with a high-speed scanning heterodyne optical interferometerApplied Optics, 2003
- Three-dimensional intelligent sensing based on the PMD technologyProceedings of SPIE, 2001
- Real-time and high-resolution absolute-distance measurement using a two-wavelength superheterodyne interferometerMeasurement Science and Technology, 1999
- Two-wavelength laser-diode heterodyne interferometry with one phasemeterOptics Letters, 1995
- Microwave interferometer with a differential quadrature phase detectionReview of Scientific Instruments, 1995
- A novel wide dynamic range silicon photodetector and linear imaging arrayIEEE Journal of Solid-State Circuits, 1984