Towards a FPGA-controlled deep phase modulation interferometer

Published

May 11, 2015

Author(s)

Marcelo Teran, Victor Martin, Lluis Gesa, Ignacio Mateos, Ferran Gibert, Nico Karnesis, Juan Ramos Castro, Thomas Schwarze, Oliver Gerberding, Gerhard Heinzel, Felipe Guzman, Miquel Nofrarias

Abstract

Deep phase modulation interferometry was proposed as a method to enhance homodyne interferometers to work over many fringes. In this scheme, a sinusoidal phase modulation is applied in one arm while the demodulation takes place as a post-processing step. In this contribution we report on the development to implement this scheme in a fiber coupled interferometer controlled by means of a FPGA, which includes a LEON3 soft-core processor. The latter acts as a CPU and executes a custom made application to communicate with a host PC. In contrast to usual FPGA-based designs, this implementation allows a real-time fine tuning of the parameters involved in the setup, from the control to the post-processing parameters.

Citation

Journal of Physics: Conference Series

Pub Type

Journals

Keywords

laser interferometery, optical metrology, instrumentation, phasemeter

Citation

Teran, M. , Martin, V. , Gesa, L. , Mateos, I. , Gibert, F. , Karnesis, N. , Ramos Castro, J. , Schwarze, T. , Gerberding, O. , Heinzel, G. , Guzman, F. and Nofrarias, M. (2015), Towards a FPGA-controlled deep phase modulation interferometer, Journal of Physics: Conference Series (Accessed January 15, 2025)