The polyvinylidene fluoride (PVDF) film, after being suitably processed, exhibits pyroelectric property which is essential property to produce electrical charge in response to a change in temperature. PVDF responses to infrared radiation, covering the radiated spectrum from the human body, that is a key point for application intruder detection. In this work, we studied the electrical response of the PVDF film due to infrared radiation from different sources and from different ranges of frequency. The results show that the film could be used in radiation detection at low frequency. In order to improve the detection, a radiation reflector and a number of amplifier circuits were designed and built. After infrared radiation from intruder was reflected by a reflector and reached the PVDF sensor, an electrical signal was produced and passed to the electronic circuits where it was amplified, filtered out, and then fed to the selected part to an alarm system. The testing results of the intruder detector show very promising results to detect the intruder with 95 % accuracy at 4 meter range, whatever day or night time.
