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US 4,615,213 AGranted
Pressure sensing instrument for aircraft
AssigneeRosemount Inc.
InventorFloyd W. Hagen
Life of this patent
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AssigneeRosemount Inc.
InventorFloyd W. Hagen
Estimating the term…
The invention comprises an improved sensing instrument (10) for sensing the angular position of the longitudinal axis (17) of a cylindrical sensor body (14) of an object moving relative to a fluid medium with respect to a first plane. Such object has a leading end portion (15) joined to the sensor body (14) and exposed to the fluid medium. A first pair of pressure sensing ports (20 and 21) are on the object and face in the upstream direction and have their axes lying in a second plane at right angles to said first plane and disposed at predetermined angles with respect to the axis (17) of the object. A second pair of pressure sensing ports (22 and 23) on the object have their axes lying in the first plane, such axes being disposed at predetermined angles with respect to the axis (17) of the object. A single pressure port (16) on the object has an axis coinciding with the axis (17) of the object. The improvement comprises the leading end portion ( 15) of the sensor body (14) defining a spherical segment of one base.
An improved sensing instrument for sensing the angular position of the longitudinal axis of a cylindrical sensor body of an object moving relative to a fluid medium with respect to a first plane, said object having a leading end portion joined to the sensor body and exposed to the fluid medium, a first pair of pressure sensing ports on the object and facing in upstream direction, said first pair of ports having their axes lying in a second plane at right angles to said first plane and disposed at predetermined angles with respect to the axis of said object, a second pair of pressure sensing ports having their axes lying in said first plane, the axes of said second pair of ports being disposed at predetermined angles with respect to the axis of said object, a single pressure port having an axis coinciding with the axis of the object wherein the improvement comprises the leading end portion of the sensor body defining a spherical segment of one base.
An air data sensing probe comprising a cylindrical tube having a central longitudinal axis, and an outer surface generated about said axis;
An air data sensing probe comprising a circular cylindrical tube portion having a central longitudinal axis, said tube having an outer surface generated about said axis at a first radius;
An improved sensing instrument for sensing the angular position of an axis of an object moving relative to a fluid medium with respect to a first plane, said object having a leading end exposed to the fluid medium, a first pair of pressure sensing ports on the object and facing in upstream direction, said first pair of ports having their axes lying in a second plane at right angles to said first plane and disposed at predetermined angles with respect to the axis of said object, a second pair of pressure sensing ports having their axes lying in said first plane, the axes of said second pair of ports being disposed at predetermined angles with respect to the axis of said object, a single pressure port having an axis coinciding with the axis of the object, and means to receive pressure signals from said ports and provide a separate signal according to the formula ##EQU2## where P.sub.1 and P.sub.2 are pressures at each of the first pair of ports respectively, P.sub.4 is the average pressure at the second pair of ports and P.sub.T is the pressure at said single port, wherein the improvement comprises the leading end portion of the object having an outer surface defining a spherical segment less than a hemisphere and the geometric center of the part spherical surface lying on the object axis, the part spherical segment being centered on the object axis.
Dependencies are inferred from the claim text.