초록 ▼

A method for determining if a motion detector is in a masked condition at the time power is applied to the detector. When power is first applied to the motion detector it enters a mask detection state which runs concurrently with activity and alarm detection routines. Any infrared motion that is det

A method for determining if a motion detector is in a masked condition at the time power is applied to the detector. When power is first applied to the motion detector it enters a mask detection state which runs concurrently with activity and alarm detection routines. Any infrared motion that is detected after the detector has warmed up and stabilized will terminate the mask detection state. If a predetermined amount of microwave Doppler sensor activity is detected within the field of view without detection of infrared activity, a mask condition is declared.

대표청구항 ▼

[ What is claimed is:] [1.] A power-on mask detection method for a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:(a) initiating a mask detection process upon detecting that power has been applied to said motion detector;(b) terminating said mask de

[ What is claimed is:] [1.] A power-on mask detection method for a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:(a) initiating a mask detection process upon detecting that power has been applied to said motion detector;(b) terminating said mask detection process upon detection of a sensed infrared signal;(c) initiating a mask detection timing window if detected microwave signals exceed a threshold prior to detection of an infrared signal; and(d) declaring a mask condition if an infrared signal is not detected during said mask detection timing window.