Time Reversal Acoustics for Environmental Change Detection
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Solution Overview
Problem
Conventional security systems, such as optical surveillance cameras, face limitations in monitoring large areas and detecting changes in environments due to data acquisition and analysis burdens, as well as difficulties in monitoring multiple target items, especially in complex geometries like spent nuclear fuel containers and geological repositories.
Innovation Solution
The method employs time reversal acoustics (TRA) by forming a test acoustic signal based on a baseline signal that has traversed an environment, detecting changes by comparing the baseline and test signals, and outputting an indication of changes, using transducers to emit and receive acoustic signals at suitable frequencies, allowing for non-invasive monitoring of environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical surveillance cameras are used to monitor environments, then visual data can be captured, but the data acquisition and analysis burden increases significantly
Solution Approach 1:
The patent replaces optical surveillance systems with an acoustic-based time reversal system. Instead of using cameras to capture visual data, the system uses acoustic transducers to emit and receive sound waves that traverse the environment. This substitution fundamentally changes the detection mechanism from optical to acoustic, eliminating the need for complex video data acquisition and analysis while providing unique capabilities to detect changes in the acoustic properties of the monitored space
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium to detect environmental changes. The time reversal process uses acoustic signals that interact with the environment's acoustic properties (such as reflections, refractions, and absorptions) to create a unique acoustic fingerprint. This intermediary approach allows detection of changes without directly observing or capturing visual data, thereby reducing data complexity while maintaining detection sensitivity
2Area of stationary object
If multiple optical cameras are deployed to monitor large areas, then coverage is improved, but coordination and data analysis difficulty increases
Solution Approach 1:
The patent employs acoustic transducers that can both emit acoustic signals and receive returning signals, making them multi-functional devices. A single transducer array can perform multiple tasks: emitting baseline signals, receiving reflected signals, and detecting changes. This universality eliminates the need for separate transmitter and receiver systems, and reduces the complexity of coordinating multiple devices while maintaining comprehensive area coverage
Solution Approach 2:
The patent combines multiple acoustic transducers into a unified time reversal array system. Instead of coordinating multiple independent optical cameras, the system merges the functionality of multiple transducers into a single coherent acoustic field. The time reversal process inherently integrates signals from all transducers, automatically coordinating their data without requiring complex post-processing or synchronization algorithms
3Volume of stationary object
If optical systems scan broader volumes, then monitoring coverage increases, but data processing limitations remain
Solution Approach 1:
The patent replaces optical scanning systems with acoustic time reversal technology. Instead of using cameras to scan and capture visual images of large volumes, the system uses acoustic waves that naturally propagate through and interact with the entire monitored volume. The time reversal process automatically focuses and processes the acoustic information, eliminating the need for complex image processing and data analysis associated with optical scanning
4Reliability
If tight geometric placement of items is monitored, then security is improved, but monitoring difficulty increases
Solution Approach 1:
The patent uses acoustic waves as an intermediary to detect changes in the geometric arrangement of items. The acoustic signals interact with the physical structures and their spatial relationships, creating a unique acoustic signature that encodes information about item positions and arrangements. This approach simplifies monitoring of complex geometries compared to optical methods, as acoustic waves can penetrate and interact with structures in ways that provide direct information about spatial relationships without requiring line-of-sight or complex image analysis
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 enables more accurate and efficient detection of changes in environments with higher spatial resolution and reduced data analysis burdens compared to conventional methods, effectively monitoring complex geometries and multiple items.
Implementation Method 1
emitting an acoustic signal into the environment
Implementation Method 2
detecting the acoustic signal subsequent to the acoustic signal interacting with the environment
Implementation Method 3
forming a test acoustic signal based on time-reversal of a baseline acoustic signal
Data Source
AI summary
A method for detecting a change in an environment is disclosed. The method includes forming a test acoustic signal based on time-reversal of a baseline acoustic signal after the baseline acoustic signal has traversed the environment while the environment is in a baseline condition. The method also includes detecting the test acoustic signal after the test acoustic signal has traversed the environment while the environment is in an unknown condition. The method includes determining whether there has been a change in the environment by comparing the baseline acoustic signal with the detected test acoustic signal after the test acoustic signal has traversed the environment while the environment is in the unknown condition.