Handrail Speed Detection Using Optical Imaging
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Solution Overview
Problem
Current speed detection devices for passenger conveyor handrails are difficult to install and maintain, and they often provide inaccurate speed readings due to indirect detection methods, such as measuring roller speed rather than handrail speed, which can be affected by sliding between rollers and the handrail.
Innovation Solution
A speed detection device installed outside the passenger conveyor, at a handrail entrance, using a light source and imaging sensor to capture image sequences of the handrail surface from a controlled distance of 5 mm to 3 cm, processing these images to accurately determine handrail speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If speed detection is performed by detecting roller speed, then the detection device can be installed inside the passenger conveyor, but the installation and maintenance become difficult and the detected speed is not accurate
Solution Approach 1:
The patent extracts the speed detection function from the internal roller detection method and relocates it to the external handrail surface. By using an imaging sensor to directly capture the handrail surface movement, the detection is performed outside the conveyor mechanism, making installation and maintenance easy while ensuring accurate speed measurement reflects the actual handrail speed.
Solution Approach 2:
The patent replaces the mechanical roller detection system with an optical imaging system. Instead of using mechanical rollers to detect speed, the system uses a light source and imaging sensor to capture images of the handrail surface, then processes these images to determine speed. This substitution eliminates the need for internal mechanical contact, improving both accessibility and accuracy.
2Measurement precision
If the imaging sensor is positioned at a distance of 5 mm to 3 cm from the handrail surface, then accurate speed detection is achieved, but the device requires precise positioning
Solution Approach 1:
The patent employs dynamic focus adjustment and real-time calibration mechanisms that allow the imaging sensor to maintain optimal imaging conditions despite variations in installation distance. The system can dynamically adjust focus and compensate for positioning variations, reducing the stringency of installation precision requirements while maintaining accurate speed detection.
Solution Approach 2:
The system allows for adjustment of imaging parameters such as focal length, exposure time, and light intensity to compensate for variations in sensor-to-handrail distance. By changing these parameters, the system can adapt to different installation positions within a range, reducing the need for extremely precise initial positioning while maintaining detection accuracy.
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 solution allows for accurate, real-time speed detection of handrails without interference from the running environment, easy installation and maintenance, and improved accuracy by directly imaging the handrail surface, reducing errors caused by sliding or other environmental factors.
Implementation Method 1
a light source part used for emitting light to the surface of the handrail; an imaging sensor used for sensing the local surface of the handrail
Data Source
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AI summary
The present invention provides a speed detection device and a speed detection method for a handrail of a passenger conveyor, and belongs to the technical field of passenger conveyors. A distance from the speed detection device (20) to a surface (91) of a detected handrail is centimeter-scale or below centimeter-scale, wherein the speed detection device (20) comprises a light source part (210), an imaging sensor (230) and an image processing part (240). Such a speed detection device and speed detection method can accurately detect to obtain speed information of the running handrail, and the speed detection device is easy to install and maintain.