P52 - Modelling Membrane-Based Compact Fiber-Interferometric Gas Pressure Sensors in Cryogenic Environments

Event
SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg
Band
Poster
Chapter
Poster Session
Author(s)
D. Hartwig, C. Reinhardt, L. Stankewitz, S. Croatto, S. Karstensen, J. Schaffran, A. Lindner - Deutsches Elektronen-Synchrotron DESY, Hamburg (Germany), H. Masalehdan, N. Sültmann, R. Schnabel - Universität Hamburg, Hamburg (Germany)
Pages
336 - 337
DOI
10.5162/SMSI2025/P52
ISBN
978-3-910600-06-5
Price
free

Abstract

Ultra-thin nanomechanical membrane oscillators are used in various technological applications. Recently, the ability to sense gas pressures across a ten-decade measurement range was demonstrated by interrogating the motion of a silicon-nitride trampoline membrane with a free-space interferometer. To increase the flexibility and compactness of this sensing solution, the use of optical fibers is a promising pathway toward broad applicability. Here, we model the interface between an optical fiber and a silicon-nitride membrane, and verify pressure readings from a prototype sensor inside a cryogenic vacuum system using a rarefied gas simulation. We find the fiber-based sensor to have a comparable readout sensitivity to a free-space setup while delivering predictable and precise pressure readings even in cryogenic environments.

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