Optical motion sensor

Details Optical motion sensor Optical motion sensor

G - Physics

01

P

340/148.2, 340/1

G01P 13/00 (2006.01) G01V 8/20 (2006.01)

Patent

CA 1326276

ABSTRACT OF THE DISCLOSURE A novel apparatus is provided herein for sensing either motion or the presence of an object, or both, within a detection region. That apparatus includes a first emitting means for generating and emitting a first beam of energy towards the detection region and also towards a sensing region. A second emitting means is provided for generating and emitting a second beam of energy complementary to the first beam of energy. Sensing means at a sensing region receive and sum the energies of the first and second beams of energy to produce a corresponding sensing signal having a constant signal portion and a time varying signal portion. Filter means coupled to the sensing means block the constant signal portion of the sum and pass the time varying signal portion. Detection means convert the time varying signal portion to a proportional detection signal indicative of either the motion or the object. Modulating means are responsive to the detection signal for modulating one of the beams of energy to null the time varying signal portion.

557750

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