Piezoelectric Foil Sensor for Seismic Acoustic Detection
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Solution Overview
Problem
Existing sensor systems for detecting seismic and acoustic signals are limited by high power consumption, large size, and high rates of false detections, making them unsuitable for rapid and economical deployment in field monitoring applications, particularly for detecting human, animal, or equipment activity.
Innovation Solution
A sensing system utilizing a piezoelectric foil layer with minimal mechanical coupling to a frame, allowing direct coupling with seismic or acoustic wavefields, which enhances sensitivity and reduces system size and cost, while maintaining stability and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-modal sensing systems are used to characterize activities, then detection reliability is improved, but device complexity and system size increase
Solution Approach 1:
The patent combines multiple sensing modalities (seismic, acoustic, magnetic) into a single integrated sensor platform using a common piezoelectric transducer element. This merging approach maintains the reliability benefits of multi-modal detection while reducing overall system complexity by eliminating the need for separate sensor systems and their associated processing electronics.
Solution Approach 2:
The piezoelectric sensor element is designed to perform multiple sensing functions simultaneously - detecting both seismic vibrations and acoustic signals through its piezoelectric properties. This multi-functionality allows a single component to replace what would traditionally require multiple specialized sensors, thereby reducing device complexity while maintaining detection reliability.
2Reliability
If multi-modal sensing systems are deployed, then detection accuracy is improved, but use of energy increases
Solution Approach 1:
By merging multiple sensing modalities into a single piezoelectric transducer, the system eliminates the need for multiple independent sensor power supplies and processing chains. The single transducer element processes all sensing functions through unified electronics, significantly reducing overall power consumption while maintaining detection accuracy.
Solution Approach 2:
The piezoelectric material inherently converts mechanical energy from both seismic and acoustic sources into electrical signals without requiring external power for the transduction process itself. This self-service capability reduces the power burden on the system, as the sensing mechanism draws energy from the environmental vibrations rather than requiring active power consumption for signal generation.
3Stability of the object's composition
If piezoelectric cable is mechanically coupled to frame, then sensor stability is improved, but sensitivity to seismic energy decreases
Solution Approach 1:
The patent introduces a foam layer as an intermediary between the piezoelectric cable and the frame. This foam intermediary provides mechanical stability and positioning for the sensor while simultaneously acting as a decoupling element that prevents the frame from interfering with seismic energy transmission to the piezoelectric element, thus maintaining both stability and sensitivity.
Solution Approach 2:
The foam layer functions as a flexible intermediary structure that conforms to the frame geometry while providing minimal mechanical constraint to the piezoelectric cable. This flexible coupling maintains sensor stability through geometric confinement without creating rigid mechanical paths that would shield seismic energy from the sensing element.
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 system achieves improved sensitivity and reduced false alarm rates, enabling earlier detection and classification of signals with increased confidence levels, and allows for more economical and rapid deployment of sensors.
Implementation Method 1
A sensing system utilizing a piezoelectric foil layer with minimal mechanical coupling to a frame, allowing direct coupling with seismic or acoustic wavefields
Data Source
AI summary
A method for forming a sensing system responsive to a wavefield of acoustic or seismic signals. One embodiment includes providing a foil layer having first and second opposing surfaces and piezoelectric properties. The foil layer, configured as a sheet, is positioned about a frame surface which provides the foil layer a stable shape while permitting the sheet configuration of the foil layer to be responsive to a wavefield of seismic or acoustic energy. Coupling between the foil layer and the frame is so limited as to render direct coupling of the foil layer with signals of the wavefield the predominant means for stimulating the sensor element with seismic energy.