Optical Straight-Line Guidance for Precise Warehouse Floor Marking
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Solution Overview
Problem
Existing methods for applying floor markings in warehouses are imprecise, especially for autonomous vehicles, as they struggle to maintain alignment over long distances due to light beam divergence and sensor limitations, leading to inaccurate navigation.
Innovation Solution
A device with a chassis, motorized movement, optical sensor, and processor that detects a light pattern to correct deviations, ensuring precise straight-line movement and marking application, using a large field of view and real-time feedback to maintain alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear optical sensor is used to detect a plane laser for ground marking, then the device can follow the laser plane to apply markings along a straight path, but beyond twenty meters the light beam divergence prevents the sensor from detecting trajectory variations
Solution Approach 1:
The patent transitions from detecting a plane laser (2D surface) to detecting a point laser (0D point) projected onto a panel. This dimensional change allows the use of a standard optical sensor with a camera instead of a specialized linear sensor, enabling long-distance detection where the point source maintains sufficient intensity and resolution despite beam divergence.
Solution Approach 2:
The patent uses a panel with a reference position that captures the laser point projection. The camera captures an image of this projected point, creating a visual copy that can be processed to determine trajectory deviations. This copying mechanism allows indirect measurement of position over long distances without requiring the sensor to directly detect the laser beam's spatial variations.
2Volume of moving object
If a small linear optical sensor is used to detect the plane laser, then the device structure is compact, but the sensor regularly loses the plane laser signal
Solution Approach 1:
By projecting the laser onto a panel and using a camera to capture the image, the system replaces a small linear sensor with a larger-area imaging sensor. This dimensional approach allows the use of a standard optical sensor with a camera that has a much larger effective detection area, reducing signal loss while maintaining a reasonable device structure.
3Ease of operation
If manual floor marking is performed by an operator navigating complex environments, then the marking process is flexible, but the markings are imprecise and not accurate enough for autonomous vehicle navigation
Solution Approach 1:
The system uses a camera to continuously capture images of the laser projection on the panel, processes these images to detect trajectory deviations, and provides real-time feedback for correction. This automated feedback loop eliminates the imprecision of manual marking while maintaining operational flexibility through programmable control.
Solution Approach 2:
The patent replaces manual mechanical marking operations with an automated optical-mechanical system. Instead of an operator physically navigating and marking, the system uses a laser projector, optical sensor, and automated control to achieve precise markings, substituting human skill with instrumental precision.
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 accurate, long-distance straight-line movement and marking, allowing autonomous vehicles to navigate complex environments with narrow passages and obstacles, ensuring precise floor markings for navigation.
Implementation Method 1
an optical sensor (56) comprising a field of view, said field of view comprising at least a portion of the surface of the panel
Data Source
Figure 1
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Figure 4
AI summary
Device (46) configured to move along a straight path, the device comprising a chassis (50); a motorized movement means (52) configured to move the chassis along the straight path; a panel (54) with a reference position (76), the panel acting as a receiver of a light emitter (48) directed towards the device; an optical sensor (56) comprising a field of view including at least the reference position (76); and a processor configured to: detect a light pattern (49) in the field of view of the optical sensor (56); compare the position of the light pattern (49) on the panel (54) with respect to the reference position (76); control the motorized movement means (52) to correct a deviation between the position of the light pattern (49) and the reference position (76).