Infrared alarm system

摘要: A battery-powered infrared sensor security system capable of operating on a single set batteries for minimum one year. The is connected to telephone line and employs bidirectional dual-tone multiple frequency (DTMF) tone generator/receiver allow communication from remote location. status may be checked the location certain parameters varied uses Fresnel lens arrangement pair sensors provide substantially uniform field coverage 180°. also real time digital analysis output signals sensors. sequence signals, performs variance measurements between current measurement stored sequence, coherence two sensors, can compare measured amplitude spectra predefined signature entered by user.