Widefield heterodyne interferometry using a custom CMOS modulated light camera | Zendy

Rikesh Patel | Zendy; Samuel Achamfuo-Yeboah | Zendy; Roger Light | Zendy; Matt Clark | Zendy

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Widefield heterodyne interferometry using a custom CMOS modulated light camera

Author(s) -

Rikesh Patel,

Samuel Achamfuo-Yeboah,

Roger Light,

Matt Clark

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.024546

Subject(s) - optics , heterodyne (poetry) , demodulation , interferometry , physics , interference (communication) , phase modulation , computer science , phase noise , telecommunications , channel (broadcasting) , acoustics

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.

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