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Pulsed thrust measurements using laser interferometry

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4 Author(s)
Cubbin, E.A. ; Electric Propulsion and Plasma Dynamics Laboratory, Princeton University, Princeton, New Jersey 08544 ; Ziemer, J.K. ; Choueiri, E.Y. ; Jahn, R.G.

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An optical interferometric proximeter system (IPS) for measuring thrust and impulse bit of pulsed electric thrusters was developed. Unlike existing thrust stands, the IPS-based thrust stand offers the advantage of a single system that can yield electromagnetic interference-free, high accuracy (≪2% error) thrust measurements within a very wide range of impulses (100 μN s to above 10 N s) covering the impulse range of all known pulsed plasma thrusters. In addition to pulsed thrusters, the IPS is theoretically shown to be capable of measuring steady-state thrust values as low as 20 μN for microthrusters such as the field emission electric propulsion thruster. The IPS-based thrust stand relies on measuring the dynamic response of a swinging arm using a two-sensor laser interferometer with 10 nm position accuracy. The wide application of the thrust stand is demonstrated with thrust measurements of an ablative pulsed plasma thruster and a quasi-steady magnetoplasmadynamic thruster. © 1997 American Institute of Physics.  

Published in:

Review of Scientific Instruments  (Volume:68 ,  Issue: 6 )