Patent ID: 8228591
Filing Date: 2012-07-24
Classification: F41G,G01S,G02B

Abstract:
1. A retroreflection detection system for the detection of optical systems, comprising: a near-IR laser, which emits a near-IR laser beam; a visible light laser, which emits a visible light laser beam; an achromatic objective lens having a front face which is parallel to the front of the detection system; a field lens located immediately behind said achromatic objective lens and having a front face which is parallel to the front face of said achromatic lens; a dual notch, dual band filter, which selectively transmits only visible and near-IR wavelength light; an eyepiece assembly; a high sensitivity sensor; means to selectively turn on either the near-IR laser, or both the visible light and near-IR lasers; means to shape both the near-IR and visible light laser beams into elongated, narrow, elliptical shapes; means to align said shaped laser beams, such that they are emitted from said detection system collimated to each other as sensing beams, which sensing beams are emitted generally central to the front face of said objective lens; whereby, if said sensing beams are retroreflected from said optical system, the retroreflected return beams will be monostatic to said sensing beams and will enter the front face of the objective lens generally central thereto and pass through the objective lens and then through the field lens as a focused and magnified beam, which beam is then passed through the dual notch filter, the eyepiece and the high sensitivity sensor, as a focused and enhanced beam which is seen as a bright spot within its surroundings.