Polarization-Based Lidar Light Deflection and Detection
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Solution Overview
Problem
LIDAR systems face inaccuracies due to secondary light emission directions being indistinguishable from the main emission direction, leading to incorrect object localization, as existing systems lack mechanisms to attenuate or block light in these directions.
Innovation Solution
A polarization-based light emission and detection system that uses a light deflection device and optical arrangement to absorb or reflect secondary light based on its polarization, ensuring only main emission direction light reaches the detector, thereby reducing unwanted light and enhancing object recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid crystal polarization grating is used to control light emission direction, then the main beam can be precisely directed towards the field of view, but secondary light in other directions cannot be attenuated or blocked
Solution Approach 1:
A polarization filter is introduced as an intermediary component between the light deflection device and the detector. This filter selectively transmits light with the desired polarization state while blocking light with orthogonal polarization, thereby eliminating secondary light interference without affecting the main beam's directional control capability
Solution Approach 2:
The system utilizes polarization state as an additional control parameter. By configuring the light deflection device to modify the polarization state of deflected light and using a polarization filter to select specific polarization states, the system can distinguish between main beam and secondary light, resolving the contradiction between directional precision and interference suppression
2Device complexity
If no mechanism is provided to block secondary light, then the device complexity remains low, but the detector receives unwanted light increasing dynamic range requirements
Solution Approach 1:
A polarization filter is introduced as a simple intermediary component that passively blocks secondary light based on polarization differences. This adds minimal structural complexity while significantly reducing the detector's dynamic range requirements by eliminating unwanted light paths
3Productivity
If secondary light is not attenuated, then the system operates with full light throughput, but object recognition accuracy decreases due to indistinguishable light paths
Solution Approach 1:
A polarization filter serves as a selective intermediary that allows main beam light to pass through while blocking secondary light. This maintains high light throughput for the desired signal path while improving object recognition accuracy by eliminating ambiguous light paths that would otherwise reach the detector
Solution Approach 2:
The system exploits polarization state changes as light is deflected to different directions. By configuring the light deflection device to impart specific polarization states to the main beam and using a polarization filter to select this state, the system maintains high throughput for valid signals while rejecting secondary light, thereby improving recognition 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
The system effectively reduces unwanted light at the detector, minimizing dynamic range and improving object recognition accuracy by distinguishing between main and secondary emission direction light, leading to more precise object localization.
Implementation Method 1
a light deflection device configured to receive polarized light, and configured to deflect the received light towards a first direction in accordance with the polarization of the received light
Implementation Method 2
an optical arrangement configured to absorb or reflect a secondary portion of the light deflected by the light deflection device travelling in a second direction, based on a polarization of the secondary portion of the deflected light
Implementation Method 3
an optical arrangement configured to absorb or reflect a secondary portion of the light deflected by the light deflection device travelling in a second direction, based on a polarization of the secondary portion of the deflected light
Data Source
AI summary
In an embodiment a LIDAR system includes a light emission system having a light deflection device configured to receive polarized light and to deflect the received light towards a first direction in accordance with a polarization of the received light and an optical arrangement configured to absorb or reflect a second portion of the light deflected by the light deflection device travelling in a second direction based on a polarization of the second portion of the deflected light.