Nanobalance: An automated interferometric balance for micro-thrust measurement

The paper is concerned with a new instrument, nanobalance, measuring thrust and noise of space micro-thrusters in the range 0-1 mN with submicronewton accuracy. Low-noise micro-thrusters will be essential for upcoming “drag-free” space missions like GOCE, SMART-2, LISA, and Darwin. Nanobalance depar...

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Bibliographic Details
Published in:	ISA transactions 2004-04, Vol.43 (2), p.169-187
Main Authors:	Canuto, Enrico, Rolino, Andrea
Format:	Article
Language:	eng
Subjects:	Applied sciences Automation Computer science control theory systems Control theory. Systems Digital control Exact sciences and technology General equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy Opto-mechatronics Physics Servo and control equipment robots Thrust stand
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Summary:	The paper is concerned with a new instrument, nanobalance, measuring thrust and noise of space micro-thrusters in the range 0-1 mN with submicronewton accuracy. Low-noise micro-thrusters will be essential for upcoming “drag-free” space missions like GOCE, SMART-2, LISA, and Darwin. Nanobalance departs from traditional thrust measuring concepts so as to exploit sensitivity of in-vacuum Fabry-Pérot interferometers to subnanometric displacements. That is achieved by an optical cavity embraced by two equal pendulums suspended at a constant distance, one of which carrying the micro-thruster under test. Any thrust, changing the optical path length of the injected laser beam, is detected as the frequency variation restoring a standing wave in the cavity. The paper presents the measurement principles, the error budget as derived from recent tests as well as instrument automation, which is essential for facilitating instrument setup and adaptation from measurement trial to trial. The authors are responsible for instrument automation and measurement processing.
ISSN:	0019-0578 1879-2022