Laser Platform Detection System for Railway Docking
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Solution Overview
Problem
Existing railway vehicle dock detection systems lack precision, reliability, and accuracy, especially in variable environmental conditions, and struggle to differentiate between the platform nose and obstacles, requiring complex and expensive equipment.
Innovation Solution
A system that projects a light beam to create a pattern, detects edges using image acquisition and comparison with stored templates, and calculates the position of the platform nose relative to the vehicle without additional ground elements, minimizing mechanical adjustments and computing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic transmitters and receivers are used for dock detection, then the system can detect the presence of a platform, but the precision and reliability are insufficient in variable environmental conditions
Solution Approach 1:
The patent replaces ultrasonic detection (acoustic field) with optical detection using laser scanners and cameras (optical field). This substitution resolves the contradiction because optical detection is not affected by temperature and precipitation in the same way ultrasonic detection is, thereby improving reliability while maintaining detection capability.
Solution Approach 2:
The patent changes the detection parameter from ultrasonic wave properties to optical properties (light reflection, laser time-of-flight). This parameter change makes the detection system immune to environmental factors like temperature and precipitation that affect ultrasonic wave propagation, thus improving reliability.
2Measurement precision
If ultrasonic detection systems are used, then platform presence can be detected, but the ability to discriminate the nose from obstacles is poor
Solution Approach 1:
The patent transitions from one-dimensional ultrasonic distance measurement to two-dimensional or three-dimensional optical imaging using laser scanners and cameras. This dimensional enhancement provides spatial information that enables discrimination between the platform nose and obstacles based on their different geometric signatures.
Solution Approach 2:
The patent utilizes optical reflection properties (analogous to color changes) where different surfaces reflect light differently. The platform nose, obstacles, and ground have distinct reflectivity characteristics that can be detected and used for discrimination, unlike uniform ultrasonic detection.
3Measurement precision
If time-of-flight laser scanners are used for object detection, then detection precision is improved, but the device becomes expensive and complex
Solution Approach 1:
The patent combines multiple simpler detection components (laser scanner for distance, camera for visual recognition, template matching algorithm) into an integrated system. While individual components are simple, their combination achieves high precision detection without requiring a single complex device, thereby reducing overall system complexity and cost.
Solution Approach 2:
The patent uses a multi-functional detection approach where the laser scanner provides distance information and the camera provides visual recognition, with template matching handling pattern recognition. This universal system can detect and discriminate various objects (platform nose, obstacles, ground) using multiple functions rather than requiring specialized expensive equipment for each function.
4Reliability
If complex detection systems are used to improve reliability, then detection accuracy is improved, but the system becomes expensive
Solution Approach 1:
The patent employs relatively inexpensive optical components (laser diodes, standard cameras) that can be manufactured at low cost compared to specialized ultrasonic or complex radar systems. These affordable components achieve reliable detection through their combination and intelligent processing rather than relying on expensive individual elements.
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 provides precise detection and positioning of the platform nose, is cost-effective, reliable, and robust, functioning independently of meteorological conditions, with high measurement precision of 5 mm, and can overcome track cant.
Implementation Method 1
means for projecting at least one light beam into the area of interest along at least one direction of projection, the means for projecting being arranged such that the light beam describes at least one pattern projected when the light beam encounters a surface in area of interest
Implementation Method 2
means for acquiring at least one image of the projected pattern from at least one viewpoint not aligned with the direction of projection
Data Source
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AI summary
The invention relates to a system and a method for detecting the presence or absence of a platform facing a train, the type of platform, its position, and the possible presence of an obstacle between the platform and the train. To this end, the system according to the invention comprises means for projecting a laser beam onto the area in which the platform is being sought, as well as a camera for recording the image of the laser beam. The system according to the invention also comprises means for comparing the image of the laser beam to templates, each representing a different type of platform.