Measuring and testing – Vibration – Sensing apparatus
Patent
1988-08-31
1990-03-06
Williams, Hezron E.
Measuring and testing
Vibration
Sensing apparatus
73516R, G01P 15125
Patent
active
049055178
ABSTRACT:
The multicomponent transducer of the present invention comprises a housing having interior surfaces forming an enclosed cavity and a single inertial mass immersed in a magnetic fluid contained therein. The inertial mass is levitated in the magnetic fluid by means of ferrohydrodynamic forces. The housing cavity and the inertial mass are generally spherical in shape such that the inertial mass is substantially unconstrained with respect to the directions of motion to which it is responsive. The multicomponent transducer also includes motion sensing means for sensing selected components of motion of the inertial mass and for generating signals representative of the magnitude and periodicity of the relative motion of the inertial mass with respect to the housing along one or more separate axes. The multicomponent transducer of the present invention has amplitude and phase responses similar to those of conventional transducers.
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Rosensweig, R. E., "Ferrohydrodynamics", Cambridge University Press, (1985).
Rosensweig, R. E., et al., "Ferrohydrodynamic Sensor Development", Air Force Flight Dynamics Laboratory Technical Report TR-67-162, (1968).
Rosensweig, R. E., "Fluid Dynamics and Science of Magnetic Liquids" Advances in Electronics and Electron Physics, vol. 48, pp. 103-179, (1979).
Hugo, G. R., et al., "Impedance Changes in a Coil Due to a Nearby Small Conducting Sphere" Journal of Phys. D: Appl. Phys. 21, (1988), pp. 33-38.
Cordell Ralph L.
Crowe Christopher
Kahng Seun K.
Amoco Corporation
Spector Mark A.
Stanley Timothy D.
Williams Hezron E.
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