Lidar Receiving Optics With Ghost Line Blocking
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Solution Overview
Problem
Lidar systems with folding reflective structures generate ghost lines when scanning high-reflectivity obstacles, leading to misrecognition and inaccurate obstacle detection.
Innovation Solution
A receiving system for lidar incorporating a ghost line reduction device, such as an aperture or light barrier plate, is used to block optical paths causing ghost lines, ensuring only valid echoes reach the detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a folding reflective structure is used to reduce structural size, then the device complexity is reduced, but ghost lines appear in the point cloud when scanning high-reflectivity obstacles
Solution Approach 1:
The patent extracts and removes the harmful reflected light paths that cause ghost lines by introducing light blocking elements (such as light blocking plates or apertures) in specific positions within the optical system. This selectively blocks only the problematic light paths while preserving the main detection function, thus eliminating ghost lines without requiring complete system redesign
Solution Approach 2:
The patent introduces intermediary elements (light blocking plates, apertures, or masks) as mediators between the reflective structure and the detector. These intermediaries selectively intercept harmful light paths that cause ghost lines while allowing valid detection signals to pass through, thereby resolving the contradiction between compact structure and detection accuracy
2Measurement precision
If a ghost line reduction device is added to block harmful echoes, then detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality modification by placing light blocking elements (such as apertures or light blocking plates) at specific localized positions within the optical system where they can selectively block only the harmful light paths responsible for ghost lines. This localized approach eliminates ghost lines without requiring comprehensive system modification, thus improving detection accuracy with minimal increase in overall device complexity
Solution Approach 2:
The patent modifies specific parameters of the optical system by adjusting the position, size, and shape of light blocking elements (such as aperture diameter or light blocking plate dimensions) to optimize the blocking of ghost line-causing light paths while minimizing impact on valid detection signals, thereby achieving improved detection accuracy with controlled structural complexity
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
Effectively suppresses ghost lines, improving detection accuracy and preventing misrecognition of obstacles, while maintaining ranging capability.
Implementation Method 1
a reflective structure, disposed downstream of an optical path of the receiving lens, to receive the echoes from the receiving lens, and change a propagation direction of the echoes by reflection
Implementation Method 2
the ghost line reduction device includes a physical structure to block an echo that causes a ghost line in a point cloud of the lidar from entering the detector
Data Source
AI summary
A receiving system for a lidar, comprises: a receiving lens, configured to receive echoes of a detection laser beam reflected by an object from an exterior of the lidar; a reflective structure, disposed downstream of an optical path of the receiving lens, to receive the echoes from the receiving lens, and change a propagation direction of the echoes by reflection; a detector, disposed downstream of an optical path of the reflective structure to receive a reflected echo from the reflective structure; and a ghost line reduction device, disposed between the reflective structure and the detector, wherein the ghost line reduction device includes a physical structure to block an echo that causes a ghost line in a point cloud of the lidar from entering the detector. The receiving system resolves the misrecognition problem caused by ghost lines in the point cloud to improve the detection accuracy of the lidar.