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Ultrasonic sensor system

  • US 4,815,046 A
  • Filed: 04/29/1985
  • Issued: 03/21/1989
  • Est. Priority Date: 04/29/1985
  • Status: Expired due to Fees
First Claim
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1. In an automatic door opener system, in which one or more swinging doors are controlled, each swinging door individually includes a door operator mechanism, at least one transducer for sensing approach to its respective door comprising, a plurality of ultrasonic transducer means for sensing objects in the swingside of said door, and wherein acoustically transparent objects can create an aspect problem to one or more of said ultrasonic transducer means in direct transducer to target directions,microprocessor means for controlling the operation of each said transducer means in a predetermined sequence and producing a door control signal for each said door operator mechanism, and wherein each said ultrasonic transducer on said swingside produce first acoustic images of the swingside of said door, said microprocessor means having a memory for storing acoustic images including said first acoustic images, and each said ultrasonic transducers on said swingside producing second acoustic images after said first acoustic images, said microprocessor comparing said first and second acoustic images from each ultrasonic transducer, respectively, to detect the presence of an object in said swingside and inhibit operation of said door operator mechanism during the presence of an object and wherein as a resolution to said aspect problem wherein a target may be acoustically transparent to any one of said ultrasonic transducers in the direct transducer to target directions, each said ultrasonic transducer being able to transmit and receive ultrasonic signals, said microprocessor means controlling the transmit and receive times, respectively of each of said ultrasonic transducers whereby any object in said swing side that may be acoustically transparent to one of said ultrasonic transducer means is not acoustically transparent to another of said ultrasonic transducer means.

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