Short range LIDAR apparatus having a flat spatial response

Details Short range LIDAR apparatus having a flat spatial response Short range LIDAR apparatus having a flat spatial response

2007-09-25

2007-09-25

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S336000, C356S337000

Reexamination Certificate

active

11240149

ABSTRACT:
A flat spatial response LIDAR apparatus for detecting particles within a short range is provided. The apparatus includes a light source projecting a light beam which is back-scattered by the particles to be detected. The back-scattered light is received, detected and analyzed. A spatial filter spatially filters the received back-scattered light in order to flatten the spatial response of the apparatus, so that a same concentration of particles at any distance within the short range will generate a signal of substantially the same intensity. This is for example accomplished by a properly profiled mask disposed in front of the detector, or a plurality of spatially distributed waveguides. As a result, the LIDAR apparatus can compensate for the 1/r2dependence, or other dependences of the back-scattered light on the distance r.

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