Optical Accelerometer for Vault Intrusion Detection
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Solution Overview
Problem
Conventional intrusion detection systems for vaults, safes, and ATMs face challenges in distinguishing between ordinary sounds and vibrations and those indicating unauthorized penetration, leading to high false alarm rates and delayed detection of actual threats.
Innovation Solution
An optical accelerometer system is mounted on the structure to detect seismic activity, immune to airborne noise, using light modulation and machine learning to differentiate between benign and threatening vibrations, providing early warning of potential intrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acoustic or microwave detectors are used to monitor protected areas, then detection coverage is provided, but the system cannot distinguish between ordinary sounds and unauthorized penetration attempts, resulting in high false alarm rates
Solution Approach 1:
The patent replaces conventional acoustic and microwave detection systems with an optical sensing system. Optical sensors detect vibrations and structural changes caused by penetration attempts, providing more reliable detection while reducing false alarms from ambient sounds. The optical field substitution eliminates the inability to distinguish between ordinary and malicious activities.
Solution Approach 2:
The system changes the detection parameter from acoustic/microwave signals to optical signals. By measuring physical displacement, vibration frequency, and structural deformation through optical means, the system achieves better discrimination between benign and threatening activities, improving reliability without proportionally increasing complexity.
2Loss of time
If vibration sensors are used to detect penetration attempts, then early warning capability is improved, but the system remains susceptible to false alarms from ambient vibrations
Solution Approach 1:
The patent introduces optical fields as an intermediary between the vibration source and the detection system. Optical sensors measure structural vibrations and displacements with high precision, enabling early detection of penetration attempts. The optical intermediary provides superior signal-to-noise ratio compared to direct mechanical sensing, reducing false alarms while maintaining early warning capability.
Solution Approach 2:
The system transitions from measuring only vibrational intensity to measuring multiple dimensional parameters including displacement magnitude, vibration frequency, acceleration, and structural deformation patterns. This multi-dimensional measurement approach enables better discrimination between benign and malicious vibrations, reducing false alarms while maintaining rapid detection response.
3Reliability
If multiple detection methods are combined to improve discrimination accuracy, then detection reliability increases, but system complexity and cost increase
Solution Approach 1:
The patent employs optical sensors that serve multiple detection functions simultaneously - measuring displacement, vibration frequency, acceleration, and structural deformation. This multi-functionality achieves high discrimination accuracy without requiring separate detection systems for each parameter, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The system combines multiple detection capabilities (vibration sensing, displacement measurement, acceleration detection) into a unified optical sensing platform. By merging these functions into a single integrated system rather than using separate acoustic and mechanical sensors, the patent achieves improved threat discrimination while controlling system complexity through consolidation.
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 effectively reduces false alarms and provides timely alerts of potential threats by accurately distinguishing between seismic activity caused by intrusions and ambient noise, enabling early countermeasures.
Implementation Method 1
an optical accelerometer comprising: a sensor body configured to be mounted on the structure; a light source housed within the sensor body and configured to generate an optical signal; a modulator housed within the sensor body and positioned in the optical path of the optical signal, the modulator being deformable in response to seismic activity affecting the structure such that the modulator modulates the optical signal in response to the seismic activity; and a photoreceiver housed within the sensor body and configured to detect the modulated optical signal
Data Source
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AI summary
A system for detecting a structural change to a structure is provided, wherein an exciter is positioned at a first location of the structure to transmit an excitation signal that is based on a reference signal and to apply the excitation signal to the structure. An accelerometer is positioned at a second location of the structure to sense the excitation signal after it has propagated to the second location. The accelerometer outputs an electrical signal that represents seismic activity applied to the structure by the excitation signal. A signal processing component is synchronized with the reference signal and receives the electrical signal. The signal processing component is configured to use the reference signal to extract portions of the electrical signal that are synchronized with the reference signal, and to output phase and amplitude values of the extracted portion. A computer is operatively connected to the signal processing component to compare the output phase and amplitude values to structural damage signals indicative of structural damages stored in a database for determining whether the signal is indicative of a change in the structure.