DAVID ALBERT FREAS
Pharmacy in Mifflinville, PA
License number
Pennsylvania RP027539L
Category
Pharmacy
Type
Pharmacist
Address
Address
Mifflinville, PA 18631
Professional information
Passive Vehicle Presence Detection System
US Patent:
5166681, Nov 24, 1992
Filed:
Jul 30, 1990
Appl. No.:
7/560052
Inventors:
H. Werner Bottesch - Danville PA
David A. Freas - Mifflinville PA
David A. Freas - Mifflinville PA
International Classification:
G08G 104
US Classification:
340933
Abstract:
A passive optical system (POS) is disclosed for detecting the presence of an object, such as a vehicle, in one or more areas of surveillance. The system includes one or more sensor tubes, each having one or more photosensitive devices arranged interiorly at one end and an opening in a wall at the other end, capable of focusing light rays emanating from a specific area of surveillance. Variations in the light rays caused by an object moving into or out of the area of surveillance cause corresponding fluctuations of the light rays impinging on the photosensitive devices, which, in turn, produce variation in a signal. The signal may be utilized to inform the driver of the host vehicle of a nearby vehicle or, when the POS is connected into a cruise control system, to manipulate the host vehicle, accordingly.