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Moderate-coherence sensing with optical cavities: ultra-high accuracy meets ultra-high measurement bandwidth and range

Engineering and Technology

Moderate-coherence sensing with optical cavities: ultra-high accuracy meets ultra-high measurement bandwidth and range

J. Dickmann, L. S. Neto, et al.

Discover a groundbreaking advancement in interferometric sensors by Johannes Dickmann, Liam Shelling Neto, Steffen Sauer, and Stefanie Kroker. This innovative approach leverages a cavity-based concept with a laser of moderate coherence, achieving unparalleled accuracy and an extended measurement range. Experience length sensing with an incredible precision of 1 nm over 120 µm, making cutting-edge technologies more accessible!

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Playback language: English
Abstract
Interferometric sensors, known for their high accuracy, often have limited measurement range due to the periodicity of their signal. This paper introduces a cavity-based interferometry concept using a laser with moderate coherence, combining ultra-high accuracy with ultra-high measurement bandwidth and range. Mid-fringe detection and interferometric visibility measurements are combined. Experimental results for length sensing show 1 nm accuracy with a 120 µm range (0.00083% relative uncertainty) and a bandwidth from 0 Hz to 20 kHz.
Publisher
Communications Engineering
Published On
Jan 25, 2024
Authors
Johannes Dickmann, Liam Shelling Neto, Steffen Sauer, Stefanie Kroker
Tags
interferometric sensors
cavity-based interferometry
laser technology
length sensing
high accuracy
measurement range
ultra-high bandwidth

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