Method and sensor for the detection of cavitations and an apparatus containing a sensor of this kind
First Claim
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1. A method for detecting fluid cavitations that may occur in a space that is being monitored and where first signals are being generated by the cavitations and second signals result from events other than the cavitations, the method comprising the steps of providing a sensor which is capable of learning;
- coupling the sensor and the space so that the sensor can pick up the signals;
subjecting the sensor to a learning phase by producing cavitations in the space over a first time interval to thereby generate first signals, sensing the first signals with the sensor, thereafter discontinuing producing the cavitations in the space over a second time interval, and sensing the second signals with the sensor, whereby during the first and second time intervals the sensor learns to differentiate between first signals caused by cavitations and second signals caused by events other than cavitations;
storing characteristics of the first and second signals sensed by the sensor following the learning phase;
operating the space in a normal manner during which second signals are produced and first signal producing cavitations may occur;
detecting the signals produced during the normal operation of the space;
analyzing the detected signals with reference to the stored characteristics of the first and second signals to determine if given signals emanating in the space are first signals; and
emitting an output signal which indicates if the given signals emanating from the space are first signals.
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Abstract
In a method for the detection of cavitations in a space to be monitored, the space to be monitored is monitored by means of a sensor (2) which is capable of learning. In this, a state in which cavitations arise in any case in the space to be monitored is first produced during a learning process for the duration of a first time interval (t1). After the completion of the first time interval (t1) a state in which cavitations do not arise in any case in the space to be monitored is produced for the duration of a second time interval (t2). In each of the two time intervals the sensor (2) learns which signals correspond to cavitations and which signals correspond to non-cavitations respectively in the space to be monitored. After the completion of this learning process the sensor compares the signals which arise during operation in the space to be monitored with the learned signals for cavitation and non-cavitation respectively and decides on this basis whether a cavitation has arisen in the space to be monitored or not and produces a corresponding output signal.
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Citations
13 Claims
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1. A method for detecting fluid cavitations that may occur in a space that is being monitored and where first signals are being generated by the cavitations and second signals result from events other than the cavitations, the method comprising the steps of providing a sensor which is capable of learning;
- coupling the sensor and the space so that the sensor can pick up the signals;
subjecting the sensor to a learning phase by producing cavitations in the space over a first time interval to thereby generate first signals, sensing the first signals with the sensor, thereafter discontinuing producing the cavitations in the space over a second time interval, and sensing the second signals with the sensor, whereby during the first and second time intervals the sensor learns to differentiate between first signals caused by cavitations and second signals caused by events other than cavitations;
storing characteristics of the first and second signals sensed by the sensor following the learning phase;
operating the space in a normal manner during which second signals are produced and first signal producing cavitations may occur;
detecting the signals produced during the normal operation of the space;
analyzing the detected signals with reference to the stored characteristics of the first and second signals to determine if given signals emanating in the space are first signals; and
emitting an output signal which indicates if the given signals emanating from the space are first signals. - View Dependent Claims (2, 3, 6)
- coupling the sensor and the space so that the sensor can pick up the signals;
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7. A sensor capable of learning for detecting fluid cavitations that may occur in a space that is being monitored, the space being initially subjected to a first state in which cavitations occur over a first time interval and a second state in which no cavitations occur over a second time interval during a learning phase for the sensor, the sensor comprising means for sensing and storing first and second signals respectively generated during the first and second time intervals, the first and second signals containing characteristics that reflect if a given signal was generated by cavitations occurring in the space or by events other than cavitations;
- means operative during normal operation of the space for investigating first and second operating signals generated during the normal operation of the space for determining if the operating signals have the characteristics of signals generated by cavitations occurring in the space; and
means responsive to the investigating means for deciding if cavitations occurred in the space and for generating a corresponding output signal. - View Dependent Claims (4, 5, 8, 9, 10, 11, 12)
- means operative during normal operation of the space for investigating first and second operating signals generated during the normal operation of the space for determining if the operating signals have the characteristics of signals generated by cavitations occurring in the space; and
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13. A liquid ring pump comprising a sensor capable of learning for detecting fluid cavitations that may occur in a space of the pump that is being monitored, the space being initially subjected to a first state in which cavitations occur over a first time interval and a second state in which no cavitations occur over a second time interval during a learning phase for the sensor, the sensor comprising means for sensing and storing first and second signals respectively generated during the first and second time intervals, the first and second signals containing characteristics that reflect if a given signal was generated by cavitations occurring in the space or by events other than cavitations;
- means operative during normal operation of the pump for investigating first and second operating signals generated during the normal operation of the pump for determining if the operating signals have the characteristics of signals generated by cavitations occurring in the space; and
means responsive to the investigating means for deciding if cavitations occurred in the space and for generating a corresponding output signal.
- means operative during normal operation of the pump for investigating first and second operating signals generated during the normal operation of the pump for determining if the operating signals have the characteristics of signals generated by cavitations occurring in the space; and
Specification
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Current AssigneeBusch NSB AG
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Original AssigneeBusch NSB AG
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InventorsBucher, Peter
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Primary Examiner(s)Freay, Charles G.
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Assistant Examiner(s)GRAY, MICHAEL KUHN
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Application NumberUS09/270,958Time in Patent Office741 DaysField of Search417/63, 417/68, 417/53US Class Current417/63CPC Class CodesF04C 14/28 Safety arrangements; Monito...F04C 2270/78 WarningsF04C 2270/80 DiagnosticsF04D 29/669 especially adapted for liqu...
