Ultrasound detection device in particular for an automatically controlled windscreen cleaning system
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United States of America Patent
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-
Jul 6, 1999
Grant Date -
N/A
app pub date -
Dec 18, 1997
filing date -
Dec 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A detection device has a transducer (10) for emitting and receiving series of ultrasonic pulses. An integrator (23) integrates echo signals resulting from ultrasonic pulses within a time window so as to produce an integral value. A time-delay circuit (28) is used to control the instant of opening T1 of a time window and a control circuit (25) determines an average value of a number of n integral values and for loading the values of the opening a instant T1 into the time-delay circuit (28) so as to maintain the average value at a steady value. The control circuit (25) determines the average value by loading a first value of T1 in the time-delay circuit before the integration of the first x echo signal and a second value of T1 in the time-delay circuit before the integration of the second n-x echo signals.
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