| 摘要 |
An apparatus is provided for infrared detection of an intruder within a detection zone (47, 49, 51) surrounding a vehicle (21). An infrared sensor (31) detects a thermal energy flux reflected or radiated from a direction of interest. The sensor (31) produces an electrical input signal having an input signal level associated with the flux. The sensor is interconnected with an electronic circuit for detecting the input signal level, comparing the input signal level with a preselected trigger level, and for producing an alert signal if the input signal level becomes equal to or greater than the trigger signal level. The electronic circuit further includes an alarm, such as a visual indicator (67, 69) or an audible signal, for receiving the alert signal and for producing a warning effect detectable by an occupant within the vehicle (21) such that the occupant is made aware that an intruder may be in the vicinity of the vehicle (21).
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