Rotation sensor

Details Rotation sensor Rotation sensor

1986-05-19

1987-06-16

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 906

Patent

active

046727531

ABSTRACT:
A toroidal liquid filled sensor measures rotation with respect to vertical in any plane normal to the earth's surface and comprises a sealed, non-conductive, hollow toroidal housing of square or rectangular cross section with an interior circular cavity or channel of like cross section. A discontinuous resistive strip circles the interior surface of the channel outer wall and a continuous conductive strip or collector circles the exterior surface of the channel inner wall. Electrical contacts are connected to each end of the resistive strip and a third contact is connected to the collector. The channel contains a quantity of dielectric or resistive fluid which has total volume less than a 30.degree. sector of the channel. Electrical damping (R-C time constant) is achieved by balancing the capacitance and resistance parameters. A single sensor has a linear range greater than 270.degree.. The combination of two sensors allows measurement of full 360.degree. of rotation and use of a sensor array allows measurement in 2 degrees of freedom for measuring pitch and roll. The sensor system is suitable for use in many applications and in particular may be used as part of a system for horizontal, guided boring in the earth.

REFERENCES:
patent: 2893134 (1959-07-01), Shea et al.
patent: 3604275 (1971-09-01), Fox

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