Piezoelectric Acceleration Sensor Shielding Design
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Solution Overview
Problem
Piezoelectric acceleration sensors face significant interference from external signals, which compromises their measurement accuracy.
Innovation Solution
The design incorporates a shielding cover and housing that encloses the piezoelectric element and mass, along with an insulating layer and a noise-reducing cable assembly, to create a shielding space that minimizes external signal interference, enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piezoelectric acceleration sensor is exposed to external signals, then the sensor can detect acceleration signals, but the measurement accuracy is compromised due to external signal interference
Solution Approach 1:
A shielding cover is introduced as an intermediary component between the external environment and the piezoelectric element. The shielding cover includes a shielding layer that blocks external electromagnetic signals from reaching the piezoelectric element, while allowing the sensor to still detect acceleration signals through the base structure. This mediator resolves the contradiction by filtering harmful external signals while preserving the desired measurement function.
Solution Approach 2:
The sensor structure is segmented into distinct functional zones: a base portion that transmits acceleration signals, a shielding cover that blocks external electromagnetic interference, and an insulating layer that electrically isolates components. This segmentation allows different parts of the system to perform specialized functions - the base handles mechanical signal transmission while the shielding cover handles electromagnetic interference blocking, thereby improving measurement accuracy without compromising signal detection.
2Measurement precision
If a shielding cover is added to reduce external signal interference, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The shielding cover is merged with the base structure through integral formation or close coupling, creating a unified component that performs both structural support and electromagnetic shielding functions. The insulating layer is integrated between the base and shielding cover, combining electrical isolation with structural assembly. This merging approach reduces the number of separate components and simplifies manufacturing while maintaining the shielding effectiveness needed for improved measurement accuracy.
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 solution effectively reduces external signal interference, thereby improving the measurement accuracy of the piezoelectric acceleration sensor by creating a double shielding effect around the piezoelectric element and mass.
Implementation Method 1
The principle of the piezoelectric acceleration sensor is to employ the piezoelectric effect of the piezoelectric element. When the accelerometer vibrates, a force exerted on the piezoelectric element by the mass changes accordingly.
Implementation Method 2
a shielding cover sleeved on the connecting portion, wherein the shielding cover is connected to the connecting portion and the supporting portion, the shielding cover forms a shielding space outside a periphery of the connecting portion and above the supporting portion
Data Source
AI summary
The disclosure relates to a piezoelectric acceleration sensor. The piezoelectric acceleration sensor includes: a charge output member comprising a base, a piezoelectric element disposed on the base and a mass, wherein the base includes a supporting portion and a connecting portion disposed on the supporting portion and extending in a first direction, and the piezoelectric element and the mass are sleeved on the connecting portion; a shielding cover sleeved on the connecting portion, wherein the shielding cover is connected to the connecting portion and the supporting portion, the shielding cover forms a shielding space outside a periphery of the connecting portion and above the supporting portion, and the piezoelectric element and the mass are arranged in the shielding space; and a housing coupled with the supporting portion, wherein the housing and the supporting portion form an accommodating space for accommodating the charge output member and the shielding cover.