Train Infrared Sensor Vibration Filtering for Obstacle Detection
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Solution Overview
Problem
Train accidents often occur due to obstacles on or near the railway that are not visible to the engine driver in time for safe braking, given factors like visibility, train speed, and obstacle size, necessitating a system to assist in detecting and evaluating potential hazards.
Innovation Solution
A method and system utilizing an infrared (IR) sensor installed on the train to receive images, filter vibrations, and provide alarm signals based on pre-defined rules, detecting rails and obstacles through temperature differences, and using GPS for tracking and obstacle identification, with a stabilizing and aiming mechanism to ensure accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the engine driver relies on visible light detection, then the detection range is limited by visibility conditions, but this results in insufficient detection distance for safe braking
Solution Approach 1:
The patent changes the detection parameter from visible light to infrared radiation. The infrared sensor detects obstacles by measuring infrared radiation emitted or reflected from objects, allowing detection in conditions where visible light fails (darkness, smoke, fog). This parameter change enables detection distances exceeding 2 kilometers, providing sufficient time for emergency braking while being independent of visible light conditions.
2Productivity
If the train travels at high speed, then productivity is improved, but the braking distance increases requiring earlier detection
Solution Approach 1:
The infrared detection system performs preliminary detection of obstacles well in advance of the train's braking point. By detecting obstacles at distances exceeding 2 kilometers before they become visible to the driver, the system provides advance warning that allows the driver to initiate braking early, thus accommodating high train speeds while maintaining safety through extended detection horizon.
3Ease of operation
If the engine driver manually detects and evaluates obstacles, then operational control is maintained, but the response time is insufficient for distant obstacles
Solution Approach 1:
The infrared sensor and processing system act as an intermediary between the obstacle and the driver. The sensor continuously scans the infrared spectrum, the processor automatically identifies potential obstacles by analyzing infrared radiation patterns, and the system provides alarm signals to the driver. This intermediary system extends detection capability beyond human visual limits while maintaining the driver's final control decision-making authority.
4Measurement precision
If infrared imaging is used to extend detection range, then detection distance is improved, but vibration effects from train movement degrade image quality
Solution Approach 1:
The patent addresses vibration effects by using the train's own vibration characteristics as a reference. The system captures vibration patterns during train operation and uses these as baseline data to distinguish between vibration-induced image variations and actual obstacle signals. By comparing current infrared images against vibration profiles stored from normal operation, the system filters out vibration noise while preserving genuine obstacle detections, enabling stable obstacle identification despite train movement.
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
Enables early detection of obstacles, allowing for timely braking and reducing the risk of accidents by providing the engine driver with critical information on potential hazards, even in conditions of limited visibility.
Implementation Method 1
receiving infrared (IR) images from an IR sensor installed on an engine of a train
Implementation Method 2
filtering effects of vibrations from the IR images based on the vibration profile
Implementation Method 3
detecting rails in the IR images based on temperature differences between the rails and their background
Data Source
AI summary
A method and system for identification of obstacles near railways and for providing alarm to an operator of a train if obstacles constitute threat to the train are disclosed. The system comprise IR sensor disposed at the front of the train facing the direction of travel. The IR sensor receives images of the rails in front of the train. The system comprises pre-stored vibration profile of the train's engine that is used to eliminate influence of the engine's vibrations on the accuracy of the received images. Presence of rails in the received frames is detected based on inherent differences of temperature between the rails and the substrate in the rails' background, such as the railway sleepers and the materials underneath it. The system may detect defects in an electric conductor system of a train.