Patent ID: 11866296
Assignee: nan
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 16:
17. A method for safely operating an automatic door, the method comprising:
providing at least one danger zone radar monitor comprising a transmitter, a receiver and a processor;
capturing at least one reference background of at least one target region where items may obstruct the door;
receiving a request to operate a monitored door;
the transmitter of the at least one danger zone radar monitor producing a beam of electromagnetic radiation directed towards the at least one target region;
the receiver of the at least one danger zone radar monitor receiving electromagnetic radiation reflected back from the at least one target region;
the processor receiving raw data from the receiver;
subtracting one of the at least one reference background from the raw data;
calculating a danger zone differential;
comparing the danger zone differential to a threshold value;
if the danger zone differential exceeds the threshold value then identifying an obstruction; and
if the danger zone differential does not exceed the threshold value then operating the automatic door.