| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a small pyroelectric infrared detector having simple structure in which the probability of detecting passing through a warn object, e.g., a human body is enhanced. SOLUTION: The pyroelectric infrared detector comprises a plurality of pyroelectric infrared detection elements arranged one-dimensionally, an infrared transmission lens 3, a chopper mechanism 4, and a band amplifier 5 disposed in the rear of infrared element and amplifying a signal generated in the infrared element selectively, all of which are housed in one housing. A plurality of such pyroelectric infrared detectors are arranged and a two-dimensional or three- dimensional human body passing detection band is provided. Passing through an object, e.g., human body is detected, based on the time series detection of signals outputted from the infrared detection elements.</p> |
