Piezo Vibration Sensor Asymmetrical Electrode Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibration sensors with piezo actuators face challenges in precise alignment and performance due to asymmetrical mounting and interference modes, leading to erroneous signals and reduced sensitivity to position tolerances.
Innovation Solution
A vibration sensor design featuring a bonded piezo drive with a recessed electrode connection that minimizes interference modes and allows for symmetrical mounting, using a common region of the piezo actuator for both excitation and detection, and an electronic system to attenuate external vibrations, reducing the need for precise alignment and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the piezo actuator is mounted with adhesive connection, then manufacturing costs are reduced and automation capability is improved, but precise alignment and fixed position holding are required which increases device complexity
Solution Approach 1:
The piezo actuator is designed with an asymmetrical electrode arrangement where one electrode is larger than the other. This asymmetry creates a inherent positioning feature that guides the actuator into the correct orientation during adhesive mounting, eliminating the need for complex alignment procedures while maintaining the benefits of adhesive connection.
Solution Approach 2:
The asymmetrical electrode design enables the piezo actuator to self-align during the adhesive mounting process. The larger electrode naturally positions itself relative to the membrane and compensating element, allowing the actuator to orient itself without external alignment tools or procedures, thereby reducing device complexity.
2Reliability
If the piezo actuator is precisely aligned, then performance is improved, but alignment difficulty increases and position tolerances become critical
Solution Approach 1:
The asymmetrical electrode configuration provides inherent positioning cues that guide the piezo actuator into the correct orientation during assembly. This design feature ensures proper alignment is achieved automatically through the adhesive mounting process, maintaining high performance while reducing the criticality of precise alignment tolerances.
Solution Approach 2:
The asymmetrical electrode design is pre-configured during manufacturing to provide alignment guidance before the actual mounting operation. This preliminary structural preparation ensures that when the actuator is mounted with adhesive, it naturally assumes the correct position and orientation, eliminating the need for complex post-assembly alignment procedures.
3Ease of operation
If asymmetrical mounting occurs, then ease of assembly is improved, but interference modes and erroneous signals increase
Solution Approach 1:
The piezo actuator employs an asymmetrical electrode design that actually prevents harmful interference modes. The asymmetry is configured to create a balanced mechanical structure that resonates at the desired frequency while suppressing unwanted interference modes, allowing easy assembly without compromising signal accuracy.
Solution Approach 2:
The design converts what could be a harmful asymmetrical mounting into a beneficial feature. By intentionally designing the electrodes to be asymmetrical, the patent transforms potential misalignment issues into a self-aligning mechanism that actually prevents interference modes and erroneous signals while maintaining assembly ease.
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 design simplifies the alignment process, reduces interference modes, and improves the sensitivity and performance of the piezo actuator by minimizing the impact of position tolerances and external vibrations, resulting in more accurate and reliable vibration detection and excitation.
Implementation Method 1
a piezo actuator (16) having a piezo element (18) and an electrode (20) connected to the piezo element (18)
Implementation Method 2
an adhesive connection (26) by means of which the piezo actuator (16) is operatively connected to the membrane (12) in such a way that vibrations of the piezo actuator (16) can be transmitted to the membrane (12)
Data Source
AI summary
A vibration sensor for detecting fill levels, limit levels, or for monitoring process parameters, having a membrane that can be set in vibration, a piezo actuator which has a piezo element and an electrode with a surface connected to said piezo element, an adhesive connection operatively connected to the membrane in such a way that vibrations of the piezo actuator can be transmitted to the membrane, and an electronic system electrically connected to the electrode surface, in which the piezo element has a recess and the electrical connection extends through this recess.