NDLI: A measurement of the period stability of a free pendulum in vacuum

Content Provider	IEEE Xplore Digital Library
Author	De Marchi, A. Ortolano, M. Periale, F. Rubiola, E.
Copyright Year	1996
Description	Author affiliation: Dipartimento di Elettronica, Politecnico di Torino, Italy (De Marchi, A.)
Abstract	High period stabilities can be expected of a fiber suspended light pendulum swinging freely in vacuum, mainly because of the extremely high Q factors (>10/sup 5/) obtainable in this almost frictionless mechanical oscillator. In this paper, the modelization and the projected stability limitations of such a system are discussed. Both the physical arrangements and the electronic data collection solutions adopted in the experimental realization of a prototype pendulum apparatus are described, and sample series of period measurements are reported, analyzed and discussed. Mechanical instrumental noise (no isolation against vibrations was provided) appears to limit the Allan deviation of post modelization residuals with a white noise of a few /spl mu/s per period, which masks all projected period measurement stability limitations. It is argued that this observed noise is generated by instability in the position of the period detector, and possible solutions to this problem are proposed.
Starting Page	665
Ending Page	673
File Size	633824
Page Count	9
File Format	PDF
ISBN	0780333098
DOI	10.1109/FREQ.1996.559949
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stability Vibration measurement Q factor Oscillators Prototypes Instruments White noise Mechanical variables measurement Noise measurement Noise generators
Content Type	Text
Resource Type	Article

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