| 摘要 |
<p>A device for detecting the presence of an object in the blind spot of a vehicle comprises a passive infrared sensor mountable on the vehicle so as to have its field of view directed toward the blind spot. The infrared sensor generates a signal in response to a heat-emitting object moving about its field of view. A bandpass filter passes signals having a frequency within a predetermined band characteristic of moving vehicles. An indicator indicates the presence of an object upon detection of a signal in the predetermined band.</p> |
