Sensing method and system for fresnel lens

摘要

A sensing method and system for Fresnel lenses are disclosed, the system including a first Fresnel lens unit for sensing the signal of a target object crossing a first boundary of a sensing area, a second Fresnel lens unit for sensing the signal of a target object crossing a second boundary of the sensing area, a third Fresnel lens unit for sensing the signal of a target object crossing a third boundary of the sensing area, and a sensing unit for receiving and processing the sensed signals of the Fresnel lens units. The first and second Fresnel lens units are arranged on two sides of the third Fresnel lens unit. Furthermore, it is possible to add more Fresnel lens units above, below or around the Fresnel lens units. By monitoring the boundaries of the sensing area, the sensing method and system for the Fresnel lenses improve the insufficiency of the sensing area, reduce cost and save power consumption.

主权项

1. A Fresnel lens sensing method, comprising:
a predetermined sensing area comprising a first boundary, a second boundary, and a third boundary; at least sensing signals of targets crossing the first boundary via a first Fresnel lens unit; at least sensing signals of targets crossing the second boundary via a second Fresnel lens unit; at least sensing signals of targets crossing the third boundary via a third Fresnel lens unit; and receiving and processing the signals sensed by the Fresnel lens units via a sensing unit; wherein the first, second, and third boundaries are borderlines of the sensing area, and wherein the borderlines are detected by central signals of the first, second, and third Fresnel lens units, accordingly.