Widefield heterodyne interferometry using a custom CMOS modulated light camera
Patel, Rikesh and Achamfuo-Yeboah, Samuel and Light, Roger and Clark, Matt (2011) Widefield heterodyne interferometry using a custom CMOS modulated light camera. Optics Express, 19 (24). pp. 24546-24556. ISSN 1094-4087
In this paper a method of taking widefield heterodyne inter- ferograms 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 modu- lated 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.
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