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Digital Interferometry: Recovering one optical signal at a time

Anneshwa Dey
03:00 PM, 06-FEB-2023.
Venue: ESB 244

ABSTRACT

Optical interferometry is used for very precise measurements across different metrology fields ranging from medical imaging to gravitational wave detection. Conventional optical interferometry provides a method for measurements that can reach this precision however, they are difficult to achieve outside a heavily controlled environment. Digitally enhanced interferometry (DI) is a form of optical metrology that employs code division multiplexing techniques to discriminate multiple interferometric signals at a single photodetector (PD), without sacrificing the sub-wavelength sensitivity of conventional interferometry. Signals belonging to the various interferometric paths in the optical system are then isolated by digitally demodulating the required signal using correspondingly delay-matched versions of the PRN code, suppressing contributions from other delays. DI shifts measurement complexity away from the optical system, instead relying on the efficient utilisation of digital signal processing (DSP) resources. In this presentation I will explain DI operation and its limitations before outlining my work synthesising perfect auto-correlation codes to improve DI multiplexing performance. I will also briefly outline the work done by my group that utilises DI.

 

BIO OF THE SPEAKER


Anneshwa Dey

PhD student , Centre of Gravitational Astrophysics

Anneshwa Dey is a 2nd Year PhD student in Centre of Gravitational Astrophysics at Australian National University (ANU). Her research is on optimisation of digital interferometry using signal processing algorithms for high resolution optical sensor. Anneshwa completed her undergraduate from India in electronics and communications engineering. She moved to Australia to do Master of Engineering in digital systems and telecommunications at ANU. Outside of research, she enjoys outreach and is a student ambassador for the College of Science










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