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Low-Noise Thrust Generation by Laser-Ablative Micropropulsion

Scharring, Stefan and Karg, Stephanie and Lorbeer, Raoul-Amadeus and Dahms, Nancy and Eckel, Hans-Albert (2015) Low-Noise Thrust Generation by Laser-Ablative Micropropulsion. In: Konferenz-DVD. 30 th International Electric Propulsion Conference IEPC 2015, 4.-10. Juli 2015, Kobe, Japan.

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Abstract

Aiming for the generation of high-precision thrust in the μN range, laserinduced ablation of propellant material is employed in order to reduce thrust noise by avoiding moving parts inside the thruster. Focused high-intensity laser pulses are used for thrust generation by the recoil of the jet of the ablated material. Whereas a single laser pulse yields an extremely low impulse bit down to 1 nNs in a 40 μm focal spot on aluminum, a broad thrust range can be accessed by the variation of the laser pulse repetition rate up to several hundreds of kilohertz. Thrust measurements with a highly sensitive torsional balance, calibrated by photon pressure, yield coupling coefficients up to 15 μN per Watt average laser power and beyond. The concept of 3D electro-optical beamsteering is discussed which is essential to ablate every part of the propellant. A detailed study for the determination of the optimum laser parameters is carried out.

Item URL in elib:https://elib.dlr.de/97576/
Document Type:Conference or Workshop Item (Speech)
Title:Low-Noise Thrust Generation by Laser-Ablative Micropropulsion
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Scharring, Stefanstefan.scharring (at) dlr.deUNSPECIFIED
Karg, Stephaniestephanie.karg (at) dlr.deUNSPECIFIED
Lorbeer, Raoul-Amadeusraoul.lorbeer (at) dlr.deUNSPECIFIED
Dahms, NancyUNSPECIFIEDUNSPECIFIED
Eckel, Hans-AlbertHans-Albert.Eckel (at) dlr.deUNSPECIFIED
Date:July 2015
Journal or Publication Title:Konferenz-DVD
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Laser ablation, elektrische Antriebe, Mikroantriebe, Kurzpulslaser, Laserantriebe, gepulste Antriebe
Event Title:30 th International Electric Propulsion Conference IEPC 2015
Event Location:Kobe, Japan
Event Type:international Conference
Event Dates:4.-10. Juli 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Studies and Concepts
Deposited By: Scharring, Stefan
Deposited On:09 Sep 2015 11:25
Last Modified:31 Jul 2019 19:54

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