System for measuring the angular displacement of an object
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United States of America Patent
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Jan 30, 1990
Grant Date -
N/A
app pub date -
May 26, 1988
filing date -
Jun 1, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved helmet line of sight measuring system for determining the spatial location of a helmet and the line of sight of an observer wearing the helmet, both relative to a coordinate reference frame. A plurality of assemblies of light sources are distributed on the helmet each comprising three light sources positioned at the vertices of a triangle and a fourth light source outside the plane of the triangle. Optical means fixed in space relative to the coordinate reference frame image the light emitted by the light sources in at least one of the assemblies onto an area image sensor, thereby producing two-dimensional image data of the light sources on the plane of the image sensor. Computing means coupled to the area image sensor is thereby able to determine the spatial coordinates of the helmet from the image data.
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