Direction sensitive counting and switching device

Details Direction sensitive counting and switching device Direction sensitive counting and switching device

G - Physics

06

M

G06M 3/00 (2006.01) G07C 9/00 (2006.01)

Patent

CA 2075899

(57) Abstract A direction selective counting and switching device should be able to distinguish people and/or objects from each other and according to the direction in which they are moving, count them and/or trigger switching processes, and be installed without essential additional constructional alterations. A detec- tor (1) designed as a multiple-element sensor shaped as one or several double rows is arranged behind a convex lens (2) so that the detection area (4) located in front of the convex lens is subdi- vided according to the detector shape in several small fields of view (4.1-4.15). A pin diaphragm (3), arranged preferably cen- trally before the convex lens, prevents the incidence of diffused light and flat rays thereon and total reflection within the lens. This device is useful in situations where people and/or objects must be separately counted according to the direction in which they are moving, for example lo detect the extent of occupation of pu- blic transport means, as an optical switch, to control traffic lights and to monitor railway tracks.

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