Patent ID: 7733043

Claim:
A method for controlling a revolving door comprised of a housing having a first opening, a second opening and a revolver positioned within the housing, the revolver having a plurality of door wings positioned about a rotation axis and dividing the housing into a plurality of chambers, the revolver operative for rotatably moving each chamber between the first opening and the second opening and vice versa, the method comprising the steps of: (a) providing at least one infrared imaging sensor, the one infrared imaging sensor operative for acquiring infrared images of a first area where the plurality of chambers rotatably pass by or through; (b) providing a drive means that is operative for rotating the revolver about the rotation axis; (c) providing a position sensor that is operative for outputting signals indicative of the angular position of the revolver; (d) causing the drive means to rotate the revolver in a first direction from a first position where a user can enter a first chamber via the first opening; (e) acquiring infrared images via the at least one infrared imaging sensor and acquiring signals from the position sensor; and (f) based on the signals acquired from the position sensor, disabling each infrared imaging sensor or its output and/or ignoring each infrared image acquired by each infrared imaging sensor when each door wing is in its field-of-view.