Peripheral event indication with pir-based motion detector

A passive infrared motion detector comprising:

• a housing;
• a lens system located on the housing to collect and focus infrared radiation from a plurality of pyramidally shaped sensing zones within a coverage area;
• an infrared sensor element and associated amplifier circuitry for generating an output signal which varies in strength with transient temperature changes occurring within the sensing zones;
• a source of a plurality of reference levels of different magnitudes;
• logic for comparing the output signal to the plurality of reference levels;
• secondary logic responsive to the comparison for generating drive signals;
• and
• an indicator system responsive to the drive signals for indicating strength of the output signal against the plurality of reference levels.

A passive infrared sensor based motion detector comprising:

• a lens system defining a plurality of pyramidally shaped sensing zones within a background;
• means for detecting changes in infrared radiation in the pyramidally shaped sensing zones against the background and generating an output signal which varies in magnitude responsive with the intensity of the changes;
• a source of a plurality of reference level signals;
• logic for comparing the output signal to the plurality of reference level signals and generating trigger signals responsive to the outcome of the comparisons;
• and
• means responsive to the trigger signals for producing staged levels of response.