Mechanical Wave Transducer Vibration Measurement in Degassed Water
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of accurately measuring vibration signals on the surface of a mechanical wave transducer in water is exacerbated by cavitation bubbles, which cause significant noise interference using conventional laser Doppler methods.
Innovation Solution
A filter is generated by comparing vibration signals measured in degassed distilled water with those in air to eliminate noise, allowing for accurate estimation of underwater vibration signals using laser Doppler vibrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the laser Doppler method is used to measure vibration signals on the surface of a mechanical wave transducer in water, then the measurement can be performed remotely without physical contact, but the measurement accuracy deteriorates due to severe noise from cavitation bubbles
Solution Approach 1:
The patent introduces degassed water as an intermediary medium between the laser and the transducer surface. This medium reduces bubble generation while still allowing optical access for the laser Doppler measurement, thus maintaining remote measurement capability while improving signal accuracy
Solution Approach 2:
The patent applies preliminary degassing treatment to the water before measurement to prevent bubble formation. By removing dissolved gases in advance through heating and vacuum treatment, the water is prepared in a state that minimizes cavitation bubble generation during the measurement process
2Power
If the mechanical wave generating device operates at high output settings to produce therapeutic shock waves, then the therapeutic effect is enhanced, but the noise from cavitation bubbles increases, reducing measurement accuracy
Solution Approach 1:
The patent changes the physical-chemical parameters of the water medium by removing dissolved gases through degassing treatment. This parameter change reduces the cavitation threshold and suppresses bubble formation even at high power output settings, allowing accurate measurements to be maintained across the full range of device output settings
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 precise measurement of vibration signals across varying output settings, reducing noise interference from cavitation bubbles and enhancing measurement accuracy.
Implementation Method 1
a laser Doppler vibrometer can be used to measure the surface vibrations of the mechanical wave transducer. The laser Doppler vibrometer measures the vibrations of a target using the light of a laser and the Doppler effect.
Implementation Method 2
When a mechanical wave transducer operates in a fluid, such as underwater, it generates a large number of bubbles, and these generated bubbles cause severe noise
Data Source
AI summary
An acoustic output of therapeutic devices used in shock wave therapy can be obtained by measuring the pressure waves radiated from the pressure wave transducer in water. Since the pressure waves used in shock wave therapy generate severe bubbles in water, measuring the surface vibrations of the pressure wave transducer using the laser Doppler method includes significant noise caused by the bubbles. This invention utilizes a filter generated to eliminate the noise in the vibration signals measured by the laser Doppler method, which is caused by the bubbles. The filter is generated by comparing the vibration signals measured in degassed distilled water with the reference signals measured in air at the minimum output setting of the shock wave generation device. Using the filter, it is possible to estimate the vibration signals of the pressure wave transducer generated underwater under the set conditions of the specific shock wave generating device.