LiDAR Light Receiving Pixel Array for High-Speed Scanning Shift Compensation
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Solution Overview
Problem
Detection accuracy in LiDAR systems decreases due to the advance movement of the light deflector during the round trip of light to an object, especially at higher scanning speeds, leading to insufficient angle of view and potential failure in object detection.
Innovation Solution
The implementation of an optical scanner with a light receiving element that includes multiple light receiving pixels arranged along the shift direction of the light beam, allowing for effective estimation of the horizontal shift of the reflected light beam and improving distance measurement accuracy by utilizing the angle change of the light deflector during the round trip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning speed of the light deflector is increased to improve detection efficiency, then productivity is improved, but the light deflector moves during the round trip of light, causing detection accuracy to deteriorate
Solution Approach 1:
The patent applies preliminary action by calculating and compensating for the advance movement of the light deflector before the light returns. The control unit预先 calculates the movement amount based on scanning speed and round trip time, then adjusts the reference position accordingly to maintain accurate detection despite high scanning speeds
Solution Approach 2:
The patent implements feedback by using the detected position information of the light deflector to continuously adjust and update the reference position for light reception. This closed-loop control ensures that even as scanning speed increases, the system maintains detection accuracy through real-time compensation
2Loss of time
If the scanning speed is increased to reduce measurement time, then loss of time is reduced, but the angle of view becomes insufficient, causing reliability to deteriorate
Solution Approach 1:
The patent applies dynamics by making the reference position adjustable and adaptive rather than fixed. The system dynamically adjusts the reference position based on the actual scanning speed and round trip time, allowing the angle of view to be optimized for each measurement condition while maintaining fast scanning speeds
Solution Approach 2:
The patent changes parameters by adjusting the reference position parameter according to scanning speed and distance. This parameter adaptation allows the system to maintain reliable detection across varying operating conditions, preventing detection failures even at high scanning speeds
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
This configuration enhances the accuracy of object detection by ensuring that the light receiving element can efficiently capture the reflected light without loss, even at high scanning speeds, thereby maintaining detection accuracy and preventing object detection failures.
Implementation Method 1
detects light reflected or scattered (at least one of reflected or scattered) from the object
Implementation Method 2
detects light reflected or scattered (at least one of reflected or scattered) from the object
Implementation Method 3
The round trip time from the light emission to light reception is obtained, and a distance to the object is calculated
Implementation Method 4
a light deflector that deflects both the emitted laser beam and the light returned from the object
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An object detector (2) includes: an optical scanner (1) including: a light source unit (11) configured to emit a light beam; and a light deflector (30) configured to deflect the light beam emitted from the light source unit (11) to scan an object in a detection region with the deflected light beam; a light receiving optical element (40) configured to collect the light beam returned from the object through at least one of reflection or scatter on the object in the detection region in response to scanning with the light beam deflected by the light deflector (30); and a light receiving element (50) configured to receive the light beam collected by the light receiving optical element (40), the light receiving element (50) including multiple light receiving pixels (51) arranged in a first direction at different positions on a plane perpendicular to the optical axis.