Ultrasonic Cavitation Sensor for Early Bubble Detection
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Solution Overview
Problem
Current methods for detecting cavitation in liquid pumps and piping systems are indirect and limited in effectiveness, particularly in noisy environments, and direct visual observation requires transparent piping and large bubbles.
Innovation Solution
An ultrasonic cavitation sensor module with transducer plugs and a controller circuit board assembly that directly senses cavitation bubbles in liquid flow, using ultrasonic transducers to detect and measure cavitation before collapse, with adjustable signal strength and threshold settings for alarm activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect sensing methods (acoustic sensors, vibration sensors) are used to detect cavitation, then detection can be performed in opaque piping systems, but the detection is delayed until cavitation bubbles collapse and produce noise or vibration, reducing the ability to prevent damage
Solution Approach 1:
The ultrasonic transducers transmit sound waves through the liquid medium before cavitation bubbles collapse, allowing detection of bubble formation and movement in real-time. This preliminary action enables early warning of cavitation conditions before damage occurs, resolving the contradiction between reliable detection and timely response
2Measurement precision
If direct visual observation is used to detect cavitation bubbles, then real-time detection is possible, but transparent piping must be used and only large bubbles can be observed
Solution Approach 1:
The patent replaces direct visual observation with ultrasonic acoustic wave transmission. Ultrasonic transducers send sound waves through the liquid, and receivers detect changes in wave propagation caused by cavitation bubbles. This substitution maintains measurement precision for small bubbles while eliminating the need for transparent piping, thereby increasing adaptability to various piping systems
3Reliability
If acoustic sensors are used to detect cavitation, then detection can be performed in opaque environments, but the sensors are unsuited for noisy environments where cavitation noise is masked
Solution Approach 1:
The system uses paired transducers where one transmits ultrasonic waves and the other receives them, creating a controlled feedback loop. By measuring the time-of-flight and intensity of the returned signal, the system can distinguish cavitation-induced signal changes from ambient noise, maintaining reliable detection in noisy environments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides direct and effective cavitation detection, enabling proactive prevention of surface damage by alerting to potentially harmful cavitation levels, suitable for various liquid systems with non-invasive and adaptable installation options.
Implementation Method 1
a first ultrasonic transducer for sending ultrasonic signals... a second ultrasonic transducer for receiving the ultrasonic signals from a first ultrasonic transducer paired therewith
Data Source
AI summary
An apparatus for sensing cavitation in liquid flowing through a conduit in a housing includes an ultrasonic transducer system having one or more ultrasonic transducers attached to the housing and arranged in acoustic communication with the liquid, and control electronics connected to the ultrasonic transducer system. The control electronics is configured to drive the transducer system to send an ultrasonic signal through the flowing liquid, wherein the transducer system receives the ultrasonic signal and generates an electronic cavitation detection signal representing a strength of the received ultrasonic signal. The control electronics is further configured to process the cavitation detection signal to provide a cavitation measurement signal indicative of whether or not the ultrasonic signal interacted with one or more cavitation bubbles, evaluate the cavitation measurement signal to determine if one or more alarm conditions is met, and output an alarm signal when each of the cavitation alarm condition(s) is met.