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Dispersion Interferometry for Relative Atmospheric Pressure Measurement

Uittenbosch, Hugo and Mahnke, Peter and Lorbeer, Raoul-Amadeus and Kliebisch, Oliver (2023) Dispersion Interferometry for Relative Atmospheric Pressure Measurement. SAMOP23, 2023-03-05 - 2023-03-10, Hannover. (Unpublished)

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Second harmonic interferometry is a common method in fusion research to measure dispersive phase shifts, i.e. for line-average electron densities [1]. Using this technique, a contact-less, relative barometer is implemented by measuring the pressure-dependent dispersive phase shift in air. This change in phase is converted into a change in pressure via the Ciddor equation [2]. In order to minimize the footprint of the experimental setup, a single crystal dispersion interferometer (SCDI) [3] is improved upon by generating a reference beam which contains both the fundamental and second harmonic beam coaxially, thereby reducing the system complexity. The device is used to measure changes in the dispersion of air in a pressurized chamber between 101 to 105 Pa and compared against a piezoresistive pressure transceiver. The deviation between both sensors was found to be less than 150 Pa. [1] Drachev, V. P., et al. "Dispersion interferometer for controlled fusion devices." Rev. Sci. Instrum. 64(4) (1993) [2] Ciddor, Philip E. "Refractive index of air: new equations for the visible and near infrared." Appl. Opt. 35(9) (1996) [3] Lee, Dong-Geun, et al. "The new single crystal dispersion interferometer installed on KSTAR and its first measurement." Rev. Sci. Instrum. 92(3) (2021)

Item URL in elib:https://elib.dlr.de/196034/
Document Type:Conference or Workshop Item (Speech)
Title:Dispersion Interferometry for Relative Atmospheric Pressure Measurement
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:8 March 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Two color interferometry, dispersion interferometry, second harmonic interferometry
Event Title:SAMOP23
Event Location:Hannover
Event Type:national Conference
Event Start Date:5 March 2023
Event End Date:10 March 2023
Organizer:Deutsche Physikalische Gesellschaft e. V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Aircraft Systems
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Solid State Lasers and Nonlinear Optics
Deposited By: Uittenbosch, Hugo
Deposited On:25 Jul 2023 10:46
Last Modified:24 Apr 2024 20:56

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