Freeway Accident Detection via Distributed Acoustic Fiber-Optic Sensing
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Solution Overview
Problem
Existing freeway monitoring systems fail to cover all sections, provide real-time and all-weather monitoring, and are prone to environmental conditions like rain, fog, and poor visibility, leading to delayed accident detection and high casualties.
Innovation Solution
A non-blind area real-time monitoring and alarming system using a distributed sound wave detection fiber-optic cable, fiber-optic sound wave demodulator, and a drone patrolling system integrated with a geographic information system (GIS) and cloud computing, enabling accurate and prompt accident detection and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera surveillance is used for freeway monitoring, then location information of accidents can be obtained, but monitoring coverage is limited and cannot operate in severe environments such as rain, fog, and snow
Solution Approach 1:
The patent replaces traditional mechanical/optical surveillance systems (cameras) with an acoustic sensing system based on fiber-optic cables. The fiber-optic acoustic sensor detects sound waves from accidents through vibration detection, eliminating the limitation of camera surveillance in severe weather conditions like rain, fog, and snow, while maintaining reliable accident detection capability
Solution Approach 2:
The patent introduces fiber-optic cables as an intermediary sensing medium that transmits acoustic information from the freeway environment to the monitoring system. The fiber-optic cable acts as a distributed sensor that converts acoustic vibrations into optical signals, enabling reliable monitoring in environments where direct camera observation fails
2Productivity
If manual detection methods are used for accident monitoring, then implementation cost is low, but detection efficiency is low and real-time monitoring cannot be achieved
Solution Approach 1:
The patent implements continuous real-time monitoring using the fiber-optic acoustic sensor system that continuously detects sound waves along the entire freeway. Unlike manual detection which is intermittent, the system provides uninterrupted monitoring, immediately detecting accidents as they occur and enabling rapid response, thereby eliminating detection delays while maintaining cost-effectiveness
Solution Approach 2:
The system enables automatic accident detection and alerting without requiring manual intervention. The fiber-optic sensor network autonomously detects acoustic signatures of accidents, processes the signals through the demodulator, and triggers alerts, replacing inefficient manual detection with an self-operating system that improves both detection efficiency and response time
3Adaptability or versatility
If distributed sound wave detection fiber-optic cable is used, then real-time all-weather monitoring is achieved, but system complexity increases
Solution Approach 1:
The fiber-optic cable serves multiple functions: it acts as both the transmission medium for optical signals and the sensing element for acoustic detection. This multi-functionality reduces the need for separate sensing components and simplifies the overall system architecture while maintaining the capability for real-time, all-weather accident monitoring
Solution Approach 2:
The patent utilizes changes in optical parameters (phase, frequency) of light traveling through the fiber-optic cable in response to acoustic vibrations. By detecting these parameter changes, the system extracts acoustic information without requiring complex mechanical sensors, thereby managing system complexity while achieving environmental adaptability
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 real-time monitoring and rapid accident response with high accuracy and adaptability to harsh environments, reducing manual detection inefficiencies and enhancing traffic safety management.
Implementation Method 1
a distributed sound wave detection fiber-optic cable that is disposed on a freeway guardrail and used for distributed online monitoring of collision sound upon occurrence of a traffic accident
Implementation Method 2
intelligently sense the sound wave of vehicle collision upon occurrence of a traffic accident by means of wavelength and phase demodulation
Implementation Method 3
intelligently sense the sound wave of vehicle collision upon occurrence of a traffic accident by means of wavelength and phase demodulation
Data Source
AI summary
A non-blind area real-time monitoring and alarming system for an accident on a freeway is provided, which belongs to the field of photoelectric technology and can solve the existing problems in whole journey information monitoring for freeways, such as failure to cover all freeway sections and lack of all-weather and prompt monitoring, and being subject to severe environments such as rain, fog and snow, or conditions such as poor visibility at night. The system includes a distributed sound wave detection fiber-optic cable, a sound wave signal demodulator, a network switch, a workstation, and a monitoring terminal. A fiber-optic sensing network composed of a series of reflection nodes distributed at equal distances is utilized to monitor sound wave signals from traffic accidents efficiently in real time without blind areas, accurately locate a traffic incident by analyzing frequency components, and transmit alarming information in time.