Multi-Frequency Transmitter Driving Under Emission Limits
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Solution Overview
Problem
Conventional transmitting devices, such as ultrasonic probes, face challenges in optimizing performance while adhering to limited electromagnetic emissions standards, as they often operate with a single predefined frequency, which restricts acoustic energy and performance without compromising emission levels.
Innovation Solution
The method involves driving the transmitting device with an electrical signal comprising multiple drive frequencies selected based on a target frequency, allowing for improved performance and reduced electromagnetic emissions without requiring structural modifications or additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a transmitting device operates with a single predefined frequency, then the electromagnetic emissions remain within authorised limits, but the acoustic energy and operating performance are restricted
Solution Approach 1:
The patent divides the electromagnetic spectrum into multiple frequency segments (first frequency, second frequency, third frequency) and sequentially activates transducer elements at different frequencies. This segmentation allows the device to distribute electromagnetic emissions across multiple lower-level frequency segments rather than concentrating energy at a single high-power frequency, thereby maintaining compliance with emission standards while achieving cumulative acoustic energy through multiple segments
Solution Approach 2:
The patent employs periodic switching between multiple frequency segments in a time-sequenced manner. Transducer elements are activated at different frequencies in alternating time intervals (first time sequence, second time sequence, third time sequence), creating a periodic pattern of electromagnetic emissions. This periodic action distributes the total energy emission over time, reducing peak emissions while maintaining effective acoustic output through cumulative energy delivery
2Reliability
If the electromagnetic emissions are limited to comply with standards, then the authorised levels are maintained, but the operating performances and acoustic power are reduced
Solution Approach 1:
The patent merges the output of multiple transducer elements operating at different frequencies to achieve cumulative acoustic power. By combining the acoustic energy from first, second, and third frequency segments that are sequentially activated, the system attains total acoustic power comparable to or exceeding single-frequency operation, while each individual frequency segment operates at lower power levels that comply with electromagnetic emission standards
Solution Approach 2:
The patent changes the operational parameters by switching between multiple frequency values (first frequency, second frequency, third frequency) and adjusting the time sequences of activation. This parameter variation allows the system to operate at multiple points in the frequency-power landscape, selecting combinations that satisfy emission constraints while optimizing acoustic power delivery for different imaging requirements
3Productivity
If multiple frequencies are used to improve performance, then the acoustic energy increases, but the electromagnetic emissions may exceed authorised limits
Solution Approach 1:
The patent applies partial action by sequentially activating transducer elements at different frequencies rather than simultaneously activating all elements at maximum power. Each frequency segment operates at a reduced level (partial action) during its designated time sequence, and the cumulative effect of these partial actions across multiple segments achieves the desired total performance without any single segment exceeding emission authorised limits
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 enhances the operational performance and quality of the transmitting device across various modes, including B mode and Shear Wave Elastography, while ensuring compliance with electromagnetic emission standards by managing average energy levels within permissible limits.
Implementation Method 1
one or more transducers are used to convert electrical energy into ultrasound waves
Implementation Method 2
each of the transducer elements converts an echo signal received into an electrical signal
Data Source
AI summary
The present disclosure relates to a method for driving a transmitting device, wherein the transmitting device operates with a target frequency (f0). The method comprises: driving the transmitting device by an electrical signal comprising various drive frequencies (f1, f2) selected depending on the target frequency (f0).