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Related Experiment Videos

Nanobalance: an automated interferometric balance for micro-thrust measurement.

Enrico Canuto1, Andrea Rolino

  • 1Politecnico di Torino, Dipartimento di Automatica e Informatica, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. enrico.canuto@polito.it

ISA Transactions
|April 22, 2004
PubMed
Summary

A new nanobalance instrument precisely measures space micro-thruster thrust and noise. This innovation is crucial for future drag-free space missions requiring highly accurate propulsion systems.

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Area of Science:

  • Spacecraft propulsion
  • Precision measurement instrumentation
  • Optical physics

Background:

  • Low-noise micro-thrusters are critical for advanced space missions (e.g., GOCE, LISA).
  • Existing thrust measurement methods have limitations for micro-thruster applications.
  • Submicronewton accuracy is required for drag-free and formation-flying missions.

Purpose of the Study:

  • Introduce and validate the nanobalance, a novel instrument for measuring micro-thruster performance.
  • Demonstrate the nanobalance's capability to measure thrust and noise with submicronewton accuracy.
  • Detail the instrument's design principles, error analysis, and automation for practical use.

Main Methods:

  • Utilized in-vacuum Fabry-Pérot interferometers sensitive to subnanometric displacements.

Related Experiment Videos

  • Employed a dual-pendulum system with an optical cavity to detect thrust-induced path length changes.
  • Measured thrust by detecting frequency variations that restore a laser beam standing wave.

    • Main Results:

    • The nanobalance achieves submicronewton accuracy in measuring thrust (0-1 mN range).
    • Presented a detailed error budget based on recent experimental tests.
    • Demonstrated instrument automation for efficient setup and repeatable measurements.

    Conclusions:

    • The nanobalance offers a breakthrough in precise micro-thruster characterization.
    • This instrument is essential for the development of low-noise thrusters for future space missions.
    • Automation significantly enhances the usability and adaptability of the nanobalance.