Apparatus and method for detecting ultrasonic waves propagated from within a selected distance
作者： John Jordan
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摘要: An ultrasonic leak detector (10) which discriminates against signals originating from outside a desired detection zone. Incoming waves are divided into mutually exclusive low (30) and high (31) frequency processed to form an intensity ratio (24). The is compared pre-selected (25), the zone ignored. presence of indicated by audio (29, 34) visual (34) devices.
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