Ultrasonic Transducer Irregular Body Diffuse Reflection
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Solution Overview
Problem
Ultrasonic transducers face long reverberation times due to multiple reflections between the resin and piezoelectric element, making short-distance detection difficult, despite the use of sound-absorbing materials, which do not completely eliminate reverberation.
Innovation Solution
An ultrasonic transducer with a molded body having a large number of irregularities, such as pyramidal recesses, legs, and protrusions, is used inside the case to diffuse-reflect ultrasonic waves, reducing direct reflections and attenuating signals, thereby improving reverberation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a sound-absorbing material is placed inside the case to reduce reverberation, then the reverberation time is reduced, but the reverberation cannot be completely eliminated and multiple reflections still occur
Solution Approach 1:
The patent employs a sound-absorbing material with porous structure placed inside the case. The porous structure allows ultrasonic waves to enter and be absorbed through friction and viscous losses within the pores, effectively reducing reverberation time while minimizing multiple reflections between the resin and piezoelectric element.
Solution Approach 2:
The sound-absorbing material acts as an intermediary substance between the ultrasonic waves and the case interior surfaces. It intercepts and absorbs the ultrasonic energy before it can undergo multiple reflections, thereby eliminating reverberation without requiring direct contact between harmful surfaces.
2Loss of time
If the sound-absorbing material is placed close to the piezoelectric element to maximize absorption, then reverberation is reduced, but the material may come into contact with the piezoelectric element causing interference
Solution Approach 1:
The sound-absorbing material is positioned at specific locations inside the case where it can effectively intercept ultrasonic waves without contacting the piezoelectric element. The material's properties and placement are optimized to provide maximum absorption in the critical regions while maintaining safe distances from sensitive components.
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
The configuration significantly reduces reverberation time by minimizing direct reflections and signal attenuation, enhancing the accuracy of distance measurement and suppressing vibrations, thus improving the transducer's performance.
Implementation Method 1
the molded body has a large number of irregularities formed in one main surface opposed to the piezoelectric element, and at least the large number of irregularities are spaced apart from the piezoelectric element. With this configuration, ultrasonic waves produced in the direction toward the inside of the case can be diffuse-reflected.
Implementation Method 2
Ultrasonic transducers apply a driving voltage to the piezoelectric element to cause the piezoelectric element and the case to vibrate to thereby transmit ultrasonic waves toward the outside of the case
Implementation Method 3
receive reflected waves bounced back from a target, and measure the reflection time
Data Source
AI summary
An ultrasonic transducer includes a case having a closed end in the main axis direction, a piezoelectric element located substantially at the center of the closed end of the case, and a body arranged inside the case so as to be opposed to the piezoelectric element. The body has an irregular surface opposed to and spaced from the piezoelectric element.