Transducer Driver Attenuating Input Current Frequency
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Solution Overview
Problem
Air-coupled capacitive ultrasonic transducers exhibit low bandwidths, leading to poor time and frequency domain performance, limited use of frequency modulated excitation, and mismatches between transducers due to high sensitivity and narrow bandwidths, which affects their operational efficiency and system feasibility.
Innovation Solution
The implementation of a device with a transfer function that attenuates the current input to the transducer around its peak frequency, reducing sensitivity and increasing bandwidth through closed and open loop systems, using equivalent circuits and transfer functions to control the mechanical output and achieve a flatband response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transducer operates at peak frequency to maximize mechanical output, then the mechanical output magnitude is maximized, but the bandwidth becomes very narrow causing high sensitivity to frequency variations
Solution Approach 1:
The patent applies parameter changes by modifying the electrical input frequency to deliberately operate away from the peak mechanical resonance frequency. This shifts the operating parameters to achieve a broader bandwidth while maintaining acceptable mechanical output levels, resolving the contradiction between maximum power and adaptability
Solution Approach 2:
The patent implements dynamic operation by continuously adjusting the drive frequency and using feedback control to maintain optimal performance across varying conditions. This dynamic approach allows the system to adapt to frequency variations and maintain stable operation across a broader bandwidth range
2Loss of energy
If the transducer has high Q value to improve energy efficiency, then energy loss is reduced, but the bandwidth becomes narrower leading to poor time domain performance
Solution Approach 1:
The patent changes the operating frequency parameter away from the high-Q resonance peak, accepting slightly higher energy loss in exchange for significantly improved bandwidth and time domain performance. This parameter shift enables the system to operate effectively across a broader frequency range
Solution Approach 2:
The patent employs feedback control mechanisms to monitor and adjust the transducer operation in real-time, compensating for the broader bandwidth operation. This feedback system maintains optimal performance by dynamically adjusting drive parameters based on actual transducer response
3Adaptability or versatility
If frequency modulated excitation is used to improve frequency domain performance, then frequency coverage is enhanced, but the low bandwidth limits the effectiveness of such modulation
Solution Approach 1:
The patent enables effective frequency modulated excitation by implementing dynamic frequency adjustment capabilities that adapt to the transducer's actual response characteristics. This dynamic control allows frequency modulation to be effectively utilized despite the transducer's inherent bandwidth limitations
4Adaptability or versatility
If coding is used to achieve frequency shaping, then frequency domain control is improved, but the low bandwidth requires very long symbols reducing productivity
Solution Approach 1:
The patent achieves frequency shaping by changing the electrical drive parameters and using impedance matching techniques rather than relying on long coded symbols. This approach maintains frequency shaping capability while significantly reducing the required symbol length and improving overall system productivity
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 approach significantly increases the bandwidth of transducers, providing a more stable and efficient mechanical output over a wider frequency range, improving time and frequency domain performance and enabling better matching between transducers.
Implementation Method 1
The device attenuates the current output at a frequency that causes a peak in the magnitude of the mechanical output of the transducer
Implementation Method 2
A driver for the transducer includes a device having a transfer function associated with the device
Data Source
AI summary
A transducer has an input and produces a mechanical output, wherein the magnitude of the mechanical output of the transducer is dependent on the frequency and magnitude of current at the input. A driver for the transducer includes a device having a transfer function associated with the device, the device having a device input and a device output, the device output being connectable to the input of the transducer and the device input being connectable to a power source. The device attenuates the current output at a frequency that causes a peak in the magnitude of the mechanical output of the transducer.