Optical system for measuring the orientation of a helmet using corner cubes and a telecentric emission lens

摘要

The overall field of the invention is that of systems for detecting the posture of a moving object in space. The device according to the invention comprises: a fixed electrooptical device (Ot) comprising a point emission source (S), a telecentric lens comprising a projection . lens (L), a reception lens ( L") and a semireflective optical element (LSR) and a photosensitive matrix-type sensor ( D), the point emission source being arranged at the common focal point of the projection lens and of the reception lens by reflection or transmission through the semireflective optical element, and; an assembly comprising at least three retroreflector devices of the "corner cube" type (Cl, C2, C3) which are arranged on the moving object. The main application of this device is the detection of the orientation of an aircraft pilot helmet.