Patent ID: 6384403
Filing Date: 2002-05-07
Classification: G01S,G01V

Abstract:
A bichromatic optical cell, comprising:first and second emitters configured to emit first and second beams having different wavelengths towards an objected to be detected; a receiver configured to receive at a fixed or a variable angle of incidence, first and second reflected beams corresponding to the first and second emitted beams; a polarizer configured to polarize the first emitted beam and to allow the second emitted beam to pass therethrough without polarizing the second emitted beam; a selection device configured to select one of a first operating mode corresponding to a polarized reflex mode and a second operating mode corresponding to a proximity mode; and a processing circuit configured to receive and process signals respectively output by at least first and second output channels of the receiver, wherein a ratio of the signals output by the at least first and second output channels varies in accordance with a monotone function of a distance of the object from the optical cell.