Patent ID: 6313462
Filing Date: 2001-11-06
Classification: G01J

Abstract:
An infrared-rays detector comprising:a pyroelectric element which intermittently outputs a first current characteristic of noise caused by ambient conditions, and which outputs a second current different from the first current in the presence of a human body;a current-to-voltage converter which converts current from said pyroelectric element to a voltage signal, said current-to-voltage converter intermittently outputting a first waveform corresponding to said first current, and outputting a second waveform corresponding to said second current and different from said first waveform in the presence of a human body; anda signal processor which performs waveform analysis on the voltage signal received from said current-to-voltage converter and outputs a detection signal when the second waveform generated by a human body is detected by the waveform analysis but does not output a detection signal when the first waveform is detected by the waveform analysis.