LIDAR Barrier Sensing for Reliable Obstacle Detection
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Solution Overview
Problem
Existing access control systems, particularly those with moving barriers, face challenges in ensuring operational safety due to environmental interference and unfavorable light conditions, as they often rely on simple light beam or video systems that are prone to errors and cannot effectively detect hazards like pedestrians or animals.
Innovation Solution
The integration of LIDAR sensors to detect and identify objects within a 2D scan area adjacent to movable barriers, coupled with a controller that adjusts the barrier's movement to prevent collisions, enhancing safety by reducing speed or halting the barrier upon object detection, and optionally using additional sensors like video or photocell sensors for redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple light beam or video systems are used to detect obstacles, then the device complexity is reduced, but the reliability of obstacle detection deteriorates due to environmental interference and unfavorable light conditions
Solution Approach 1:
The patent replaces optical detection systems (light beams and video cameras) with LIDAR (Light Detection and Ranging) technology. LIDAR uses laser beams to actively illuminate the scene and measure the reflected light, transforming passive optical detection into active ranging. This substitution resolves the contradiction by providing reliable depth measurement that is independent of ambient light conditions, while maintaining relatively simple system architecture.
Solution Approach 2:
The patent changes the detection parameter from 2D image data (video systems) or simple light presence/absence (photocells) to 3D spatial information with precise distance measurement. LIDAR provides range data that enables accurate obstacle detection in three-dimensional space, resolving the reliability issue while the processed spatial data maintains computational efficiency.
2Reliability
If LIDAR sensors are integrated to improve obstacle detection reliability, then the reliability of safety detection is improved, but the device complexity increases
Solution Approach 1:
The patent integrates LIDAR technology into existing access control gate systems, allowing the LIDAR sensor to serve multiple functions: obstacle detection, obstacle classification (vehicle vs. pedestrian), and spatial mapping. This multi-functionality approach resolves the contradiction by consolidating what would otherwise require multiple separate systems into a single integrated solution.
Solution Approach 2:
The patent introduces a specialized controller unit that acts as an intermediary between the LIDAR sensor and the gate motor. This controller processes the complex LIDAR data, classifies detected objects, and generates appropriate control signals, thereby managing the complexity rather than allowing it to propagate through the entire system.
3Measurement precision
If video systems are employed to detect obstacles, then the measurement precision of obstacle detection is improved, but the ease of operation deteriorates due to complex deployment and operation requirements
Solution Approach 1:
The patent replaces complex video processing systems with LIDAR-based detection. LIDAR directly measures distance and spatial position through time-of-flight calculations, providing precise 3D data without requiring complex image processing, object recognition algorithms, or calibration procedures. This substitution maintains high measurement precision while dramatically simplifying system operation.
4Device complexity
If torque-based obstacle detection is used, then the device complexity is reduced, but the reliability deteriorates because the barrier cannot avoid inadvertent contact with obstacles
Solution Approach 1:
The patent implements LIDAR-based obstacle detection that operates before the gate begins its closing motion or during early movement. By detecting obstacles in advance and classifying them (vehicle, pedestrian, animal), the system can prevent closing actions entirely or adjust speed accordingly, rather than relying on reactive torque-based stopping that occurs after contact has already been made.
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 LIDAR-assisted access control system significantly improves safety by accurately detecting and differentiating objects, reducing environmental interference, and preventing unintended collisions, even in adverse conditions, thereby ensuring reliable operation of movable barriers.
Implementation Method 1
Light detection and ranging (LIDAR) is a well-known technology for terrain mapping using a stationary LIDAR device
Implementation Method 2
a LIDAR sensor that is configured to sense an object within a 2D scan area
Data Source
AI summary
Systems and methods are presented that use a LIDAR sensor to detect and/or identify an object in proximity of an access control device, and especially a movable barrier. Most typically, the LIDAR sensor provides for a 2D scan area that is offset from and substantially parallel to the movable barrier while the movable barrier moves from the first position to the second position.