LiDAR Beam Splitter Extinction Device for Stray-Light Rejection
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Solution Overview
Problem
The presence of leading light within LiDAR systems affects detection accuracy due to its reflection back into the detector, causing crosstalk and reducing the effectiveness of distance measurements.
Innovation Solution
Incorporation of a first extinction device between the beam splitter and receiver to block optical signals in non-primary optical path regions, preventing stray light from reaching the receiver and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beam splitter is used to separate emission light and echo light paths, then the LiDAR can detect target objects, but stray light in non-primary optical paths is reflected back to the receiver causing leading light that affects detection accuracy
Solution Approach 1:
The patent extracts and removes the harmful leading light from the optical path by introducing an extinction device that specifically targets and eliminates stray light in non-primary optical paths before it reaches the receiver, thereby resolving the contradiction between maintaining detection capability and eliminating interference
Solution Approach 2:
The extinction device acts as an intermediary component between the beam splitter and the receiver, selectively blocking harmful optical signals while allowing valid echo light to pass through, thus mediating between the need for sensitive detection and the need to reject interference
2Use of energy by moving object
If the receiver collects all incoming light signals, then more echo light energy is received improving signal strength, but stray light and leading light are also received reducing measurement precision
Solution Approach 1:
The extinction device introduces local quality differentiation into the optical path by creating distinct transmission characteristics for different spatial regions - the primary optical path maintains high transmission for valid signals while non-primary paths are blocked, allowing the receiver to collect useful energy while rejecting interference
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
Enhances detection accuracy by eliminating the influence of stray light, particularly for close-range targets, and expanding the detection field of view.
Implementation Method 1
the light-transmitting portion is configured to receive the emission light emitted by the transmitter, and transmit the emission light to the target object outside the housing
Implementation Method 2
the light-reflecting portion is configured to receive the echo light reflected by the target object outside the housing
Implementation Method 3
the first extinction device is configured to block the optical signal in the non-primary optical path regions from being transmitted to the receiver
Data Source
AI summary
A LIDAR and a movable device are provided. The LiDAR includes a housing, a transmitter, a receiver, a beam splitter, and a first extinction device. The beam splitter includes a light-transmitting portion and a light-reflecting portion connected to the light-transmitting portion. The first extinction device is located inside the housing, along the transmission path of the echo light, and between the beam splitter and the receiver, and the first extinction device is configured to block the optical signal in the non-primary optical path regions from being transmitted to the receiver.