| 摘要 |
A single transducer ultrasonic target detector and detection method are disclosed which provide for detection down to substantially zero distance from the detector housing envelope with an electroacoustic transducer subject to unavoidable ringing following emission of a burst of acoustic energy. The housing is configured with a retroreflecting surface proximate the transducer so that acoustic energy reflected from the target is repeatedly reflected back toward the target until the ringing has subsided sufficiently to permit reception of the reflected acoustic energy by the transducer.
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