Piezoelectric Sensing Device Parallel Electrode Connection
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Solution Overview
Problem
Conventional piezoelectric sensor combinations often weaken high-frequency signals, which are crucial for accurate positioning, while failing to effectively boost them, leading to reduced precision in applications involving mechanical waves.
Innovation Solution
A novel connection method for piezoelectric sensors that amplifies high-frequency signals while attenuating low-frequency signals by adjusting the phase difference and equivalent distance between piezoelectric regions, resulting in enhanced positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric sensors are connected in series as per conventional approach, then low-frequency signals are boosted, but high-frequency signals are weakened
Solution Approach 1:
The patent inverts the conventional series connection approach by using parallel connection with specific phase adjustments. Instead of connecting positive to negative electrodes sequentially, the patent connects corresponding electrodes (positive to positive, negative to negative) in parallel while controlling phase differences, thereby achieving the opposite frequency response characteristic - boosting high-frequency signals while attenuating low-frequency signals.
Solution Approach 2:
The patent changes the connection parameters by adjusting the phase difference between piezoelectric sensors and their equivalent distance. By controlling these parameters, the system can selectively amplify or attenuate specific frequency ranges, enabling high-frequency signal enhancement for improved positioning accuracy while suppressing low-frequency components.
2Power
If multiple piezoelectric sensors are combined to boost signal strength, then signal amplitude increases, but high-frequency signal resolution deteriorates
Solution Approach 1:
The patent applies different connection configurations to different sensor groups within the array. By creating zones with different phase relationships and connection types (parallel vs. series), the system can locally optimize for high-frequency enhancement in certain regions while maintaining overall signal amplitude, thereby preserving high-frequency resolution while achieving sufficient signal strength.
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 proposed solution effectively doubles the amplitude of high-frequency signals while minimizing low-frequency signals, improving positioning accuracy by enhancing the output waveform, as demonstrated through experimental comparisons with prior art.
Implementation Method 1
A piezoelectric sensor is a common sensor for measuring vibration or force, which uses piezoelectric effect of a certain dielectric medium. When an external force is applied to a surface of the dielectric medium, an electric charge is generated on a surface of the dielectric medium
Data Source
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AI summary
Disclosed is a piezoelectric sensing apparatus, comprising: a plurality of piezoelectric regions, each piezoelectric region including an anode surface and a cathode surface, wherein the plurality of piezoelectric regions are successively connected from the first piezoelectric region to the last piezoelectric region such that between adjacent piezoelectric regions, surfaces of a same polarity are connected, i.e., one anode surface is connected to another anode surface, while one cathode surface is connected to another cathode surface. The piezoelectric sensing apparatus as provided may effectively boost a high-frequency signal while weaken a low-frequency signal, such that an output waveform signal facilitates improving the positioning accuracy.