Acoustic Nanoparticle Counter With Stable Flow Cavitation Detection
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Solution Overview
Problem
Existing acoustic cavitation methods for detecting nanoparticles in liquids suffer from limitations such as dependency on flow conditions, contamination risks from degassing setups, large footprint, and inability to simultaneously measure different particle sizes or samples.
Innovation Solution
Implementing a system with controlled acoustic wave intensity and flowrate, using replicates of transducers and measurement cells with a compact waveform generator, and a flow stabilization mechanism to ensure stable conditions for simultaneous multi-size particle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a degassing setup (pump, degassing cell, tubing) is added to force gas pockets out of particles, then cavitation threshold is reduced and gas pockets are removed, but the liquid medium becomes contaminated by the additional components
Solution Approach 1:
The patent extracts and removes the harmful degassing components (pump, degassing cell, tubing) from the measurement system. Instead of using active degassing equipment that contaminates the sample, the invention uses a passive approach where the measurement cell itself is designed to minimize gas pocket formation through controlled pressure conditions and acoustic field application, thereby eliminating the contamination source while still addressing the gas pocket problem
Solution Approach 2:
The patent introduces an intermediary approach by using acoustic pressure waves as a mediator to manage gas pockets without physical contact from degassing equipment. The acoustic field acts as an intermediary mechanism that can collapse gas pockets or prevent their formation through cavitation control, avoiding the need for mechanical pumps and tubing that would contaminate the high-purity water sample
2Adaptability or versatility
If multiple separate measurement setups with individual controllers are used to detect different particle sizes simultaneously, then different cavitation conditions can be achieved, but the device footprint becomes excessively large
Solution Approach 1:
The patent merges multiple measurement capabilities into a single integrated measurement cell. By using a single transducer that can operate at multiple acoustic frequencies and intensities, the system combines what would otherwise require separate measurement setups into one compact device, enabling simultaneous detection of different particle sizes without multiplying the footprint
Solution Approach 2:
The patent implements multi-functionality by designing a universal measurement cell with a transducer that can detect various particle sizes through adjustable acoustic parameters. The single measurement setup can adapt to different measurement requirements by changing frequency and intensity, eliminating the need for multiple specialized devices and reducing overall system footprint
3Adaptability or versatility
If successive acoustic pulses with different intensities are used to detect different particle sizes, then multiple cavitation conditions are achieved, but measurement time increases due to long off-time requirements
Solution Approach 1:
The patent enables continuous measurement by allowing successive acoustic pulses with different intensities to be sent without requiring long off-time periods. The system maintains continuous liquid flow and can rapidly switch between acoustic intensities, keeping the measurement process continuous and avoiding the time losses associated with sample recovery and renewal between pulses
4Ease of operation
If flow rate and pressure conditions are not stabilized, then the system is simpler to operate, but measurement consistency deteriorates
Solution Approach 1:
The patent implements self-service by designing the measurement cell with integrated flow stabilization features that automatically maintain consistent flow conditions without requiring external complex control systems. The cell geometry and acoustic field configuration work together to naturally stabilize the liquid flow, providing measurement consistency while keeping the operation simple
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
Enables accurate, reproducible, and compact online monitoring of nanoparticle purity in liquids, allowing simultaneous measurement of different particle sizes with reduced contamination and footprint.
Implementation Method 1
acoustic cavitation in bulk liquids occurs on nucleation seeds such as particles
Implementation Method 2
The detection of a cavitation event at a known acoustic pressure thus gives an indication of the size of the particle
Data Source
AI summary
In semiconductor manufacture requiring ultra high purity water, particles of specified sizes are detected using acoustic particle detection capable of detecting nanoparticles. A sensor unit receives a flow of water, with the pressure and rate of flow to the sensor controlled closely. In each sensor unit is a measurement cell to receive a continuous flow of water, with a transducer module engaged with the cell to deliver an acoustic pulse at a known level of intensity as the liquid flows through the cells, the acoustic pulse acting on the liquid at a focus zone to cause cavitation in the event a particle of size detectable at that intensity is present. A waveform emitter/receiver connected to the sensor unit sends high-frequency, high-voltage signal to the transducer module to cause the acoustic pulse, and it also receives a waveform echo indicating a cavitation event. The system is controlled by a microprocessor.