Proximity detector

Details Proximity detector Proximity detector

G - Physics

01

N

G01N 21/84 (2006.01) B60Q 1/48 (2006.01) G01S 17/93 (2006.01)

Patent

CA 2060397

ABSTRACT A proximity detector for motor cars, to aid parking, has 3 infra-red transmitter units 10-1 to 10-3 producing a zone of radiation 36 and two receiver units 20-1 and 20-2 producing a zone 46 of sensitivity to the radiation. Each transmitter unit comprises 3 transmitter elements housed behind a common aperture (Fig. 3, not shown), and each receiver unit comprises 2 receiver elements housed behind a common aperture (Fig. 4, not shown), giving for each unit a polar diagram with at least two distinct directions of high magnitude, the axes of peak radiation or sensitivity from the elements of a unit being divergent through the aperture and forming the directions of high magnitude. Indicating means (23-25, Fig. 1 - not shown) indicate the amplitude of the combined signal from the receivers by means of a pulsed tone the pulse frequency of which is varied.

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