Lidar Extinction Component Reduces Stray Light Blind Areas
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Solution Overview
Problem
Solid-state lidars face issues with detection blind areas due to stray light signals caused by the reflection and scattering characteristics of MEMS components, which interfere with the receiving module's ability to identify nearby objects.
Innovation Solution
An optical scanning apparatus and lidar system that incorporates a reflector and an extinction component or layer to reduce scattered light signals, with the extinction component having a smaller scattering coefficient than the reflector substrate, thereby minimizing stray light and enhancing detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MEMS components are used for scanning in solid-state lidars, then the system reliability and detection performance are improved, but stray light signals are generated due to reflection and scattering characteristics, causing detection blind areas
Solution Approach 1:
The patent extracts and removes the harmful scattering function from the reflector substrate by introducing an extinction component that specifically targets and eliminates scattered light paths, while preserving the useful reflection function for the main laser beam
Solution Approach 2:
The extinction component acts as an intermediary element positioned between the reflector substrate and the receiving module, intercepting stray light signals before they reach the receiver and converting them into harmless energy or redirecting them away from the detection path
2Measurement precision
If the receiving module is made extremely sensitive to detect nearby objects, then the detection capability for nearby objects is improved, but the receiving module responds to stray light signals, submerging the reflected light signals from nearby objects
Solution Approach 1:
The extinction component performs preliminary anti-action by preemptively eliminating stray light signals before they can interfere with the receiving module, allowing the receiver to maintain high sensitivity without being overwhelmed by scattered light
Solution Approach 2:
The patent converts the harmful effect of scattered light on the reflector substrate into a beneficial situation by using the extinction component to selectively remove only the scattered portion while preserving the main beam, effectively transforming the scattering problem into a controlled light separation solution
3Object-generated harmful factors
If the scattering coefficient of the reflector substrate is reduced to minimize stray light, then the stray light signals are reduced, but the detection blind area increases due to loss of reflected light
Solution Approach 1:
The extinction component introduces local quality differentiation by selectively targeting only the scattered light paths while leaving the main reflection paths unaffected, achieving stray light reduction without compromising the reflected light intensity needed for detection
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 solution significantly reduces the detection blind area and improves the receiving and detecting ability of the lidar by minimizing stray light signals, allowing for more effective identification of nearby objects.
Implementation Method 1
the reflector is used to reflect the incident light signals
Implementation Method 2
the extinction component is used to reduce the scattered light signals produced by the incident light signals on the reflector substrate
Data Source
AI summary
An apparatus in the field of optics technology, can include a reflector, a reflector substrate, and an extinction component. The reflector can be mounted on the reflector substrate. The extinction component can be arranged on a front surface of the reflector substrate. The reflector can be configured to reflect incident light signals. The extinction component can be configured to reduce the scattered light produced by the incident light signal on the reflector substrate. An optical scanning device (for example, lidar) having such features may greatly reduce the scattered light inside the lidar, reduce the detection blind area caused by the stray light, and greatly improve the receiving and detecting capabilities of the lidar.