Development of efficient FPGA-based phase meters for IR-Interferometers. Optimizations for multichannel interferometers L. Esteban a), M.Sánchez a), J.Sánchez a) a) Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, Avd Complutense Nº22, Madrid, Spain. J. A. López c), O. Nieto-Taladriz c) c) Departamento de Ingeniería Electrónica, ETSI Telecomunicación, Universidad Politécnica de Madrid, Avd Complutense Nº20, Madrid, Spain. P. Pedreira c), P. Acedo c) c) Departamento de Opto-Electrónica y Tecnología Laser, Universidad Carlos III de Madrid, Avd de La Universidad SN, Leganés, Spain.
Online processing concept Pre-processing – De-noising of input carrier signals (interference signals) (TJ-II, W7-X) – Digital Diplexing (W7-X) – Crosstalk elimination... Processing – Phase demodulation of the input signals with a proper algorithm Post-processing – Control signals – Operations over the demodulated signals
Compensation results TJ-II, W7-X
Electron density computation, example TJ-II λ 1 ΔΦ 1, λ 2 ΔΦ 2 Optical pathlength differences Average electronic density Maximun phase shift 10 fringes (periods) CO 2 Maximun phase shift 100 fringes (periods) NdYAG 2 μm
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