http://www-bsac.eecs.berkeley.edu/groups/bmad/BIRN/home.htm
Focusing devices for pyroelectric infrared sensors
Pyroelectricity Wikipedia
Pragnay Choksi (Projetos de Robôs)
Pyroelectricity (Wikipedia)
Pyroelectric Infrared Sensor (Google Images, Google PDFs, Google Videos)
Modules
DP-001: Digital Infrared Motion Detector Module
DP-005: Digital Direction Sensing Infrared Motion Detector
Data Sheets (Google PDFs)
Pyroelectric Infrared Sensors & Sensor Modules (pdf)
Application Notes (Google PDFs)
Connecting a Pyroelectric Infrared Sensor (pdf)
Silicon Chip
www.siliconchip.com.au