Ultrasonic Transducer Temperature Compensation via Dynamic Frequency
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Solution Overview
Problem
Ultrasonic transducers with poor temperature-sound pressure characteristics are limited in their applications, especially in severe temperature environments, as they fail to maintain effective output sound pressure due to temperature changes, and existing solutions do not adequately address the temperature characteristics of resonant frequency, mechanical quality coefficient, electrostatic capacity, and piezoelectric constant.
Innovation Solution
The ultrasonic transducer design includes a piezoelectric vibrator and a case with an acoustic path where air serves as the medium, with the piezoelectric vibrator driven at a frequency that counteracts the temperature-sound pressure and temperature-amplitude characteristics, utilizing a buckling tuning fork vibration mode with two piezoelectric vibrators vibrating in opposite phases, and forming acoustic paths that resonate in λ/4 mode to enhance sound pressure over a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the piezoelectric vibrator is driven at the resonant frequency for maximum sound pressure at a specific temperature, then the output sound pressure is maximized at that temperature, but the temperature-sound pressure characteristic deteriorates and the ultrasonic wave may not arrive at the target when temperature changes
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The frequency adjustment unit dynamically changes the driving frequency in response to temperature changes, allowing the system to maintain optimal performance across varying temperatures. This transforms a static resonant frequency system into a dynamic one that adapts to environmental conditions.
Solution Approach 2:
The patent changes the parameter of driving frequency based on temperature conditions. By detecting temperature changes and相应地 adjusting the driving frequency, the system maintains effective ultrasonic wave transmission. This parameter change approach allows the transducer to compensate for temperature-induced frequency shifts and maintain reliable operation.
2Reliability
If the driving frequency is adjusted to compensate for temperature changes in resonant frequency, then the temperature-sound pressure characteristic improves, but the device complexity increases due to additional frequency adjustment mechanisms
Solution Approach 1:
The patent implements feedback by using a temperature detection unit to monitor temperature changes and a frequency adjustment unit that responds to these changes by modifying the driving frequency. This closed-loop feedback system automatically compensates for temperature effects without requiring complex manual intervention or sophisticated control algorithms.
Solution Approach 2:
The system performs self-service by automatically detecting temperature changes and adjusting its own operating frequency without external intervention. The frequency adjustment unit is configured to autonomously modify the driving frequency based on temperature detection, enabling the device to self-correct for environmental variations.
3Device complexity
If a fixed driving frequency is used to simplify the device structure, then the device complexity is reduced, but the temperature-sound pressure characteristic worsens and the ultrasonic transducer becomes unreliable in varying temperature environments
Solution Approach 1:
The patent transforms the static fixed-frequency system into a dynamic adjustable-frequency system. By introducing the frequency adjustment unit that can modify the driving frequency in response to temperature changes, the system gains adaptability while maintaining relatively simple overall structure through the use of straightforward adjustment mechanisms.
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
This configuration results in a stable and high output sound pressure across a wide temperature range, improving the temperature-sound pressure characteristic by counterbalancing temperature-related effects, ensuring consistent performance from -20°C to 80°C.
Implementation Method 1
an ultrasonic wave generator 1 having a piezoelectric vibrator 13
Implementation Method 2
forming acoustic paths that resonate in λ/4 mode to enhance sound pressure
Implementation Method 3
utilizing a buckling tuning fork vibration mode with two piezoelectric vibrators vibrating in opposite phases
Data Source
AI summary
An ultrasonic transducer is provided that includes an ultrasonic wave generator having piezoelectric vibrators, and cases having ultrasonic wave emission holes and accommodating the ultrasonic wave generator. Acoustic paths in which air serves as a medium are formed by the ultrasonic wave generator and the and extend from the piezoelectric vibrators to the ultrasonic wave emission holes. Resonance of air is generated in the acoustic paths by ultrasonic waves generated by the piezoelectric vibrators in which the ultrasonic wave emission holes are open ends of the resonance. The piezoelectric vibrators are driven at a driving frequency at which the temperature-sound pressure characteristic for the resonance of air and the temperature-amplitude characteristic at the driving frequency of the piezoelectric vibrators have opposite tendencies.