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Figure 3 AMN31111 sensor
Figure 4 Electrical characteristic from AMN31111 datasheet
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It detects variations in infrared rays. However, it may not detect in the following case: lack of movement, no temperature change in the heat source
Signal can converted to digital by external A/D converter. It also can be connected directly to microcomputer. Signal may not be need to convert to digital if digital version of the sensor is chosen.
It's calibrated to detect differences in the temperature between the background and the object, movement speed and the object(human body).
Some noise is detected in the sensor, typical noise value being 155 m Vp-p to maximum of 300 m Vp-p. A noise filter is recomemded recommended for applications requiring enhanced detection, reliability and noise withstanding capability.
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The sensors circuit is entirely enclosed in a TO-5 metal package which is standardized metal semiconductor package. The front surface of the lens and case are made of polycarbonate and the lens is made of soft materials, polyethylene. The materials are resistant to water, alcohol, oil, salt and weak acids which allows it to be use outdoors but not recommended if not waterproofed.
Group members:
Mohammad Shahidul Islam, Riku Sorsa
References:
http://www.ehow.com/how-does_4596955_motion-sensor-work.html
http://illumin.usc.edu/assets/media/160/1000pxSonar_Principle_EN.svg.png
http://images.machinedesign.com/images/archive/72829sensorsens_00000051108.jpg
http://www3.panasonic.biz/ac/e/control/sensor/thumbnail/amn31111.gif
http://www.panasonic-electric-works.com/cps/rde/xbcr/eu/ds_61804_en_pir_motion_sensor.pdf
