Lidar Sensor Alignment for Parallax-Free Distance Measurement
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Solution Overview
Problem
Existing lidar systems face challenges in avoiding parallax-induced sensitivity loss and maintaining image quality across varying detection ranges, particularly in bi-axial systems, due to fixed alignments of light source and receiver.
Innovation Solution
The sensor unit adjusts the orientation of the emitter and receiver elements dynamically based on detected distances and environmental parameters, allowing for individual pixel selection and alignment correction to compensate for parallax and optimize signal energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed alignment of light source and receiver is used in bi-axial lidar systems, then device complexity is reduced, but sensitivity loss occurs due to parallax effects
Solution Approach 1:
The patent implements dynamic adjustment of the receiver element's orientation relative to the light source based on detected distance. The receiver can rotate or tilt to change its viewing direction, allowing the system to adapt to different detection ranges and eliminate parallax-induced sensitivity loss without requiring complex mechanical alignment mechanisms for all scenarios
Solution Approach 2:
The system changes the orientation parameter of the receiver element as a function of detection distance. By adjusting the receiver's angular position based on the distance to the target object, the system optimizes the alignment between light source and receiver for each specific detection scenario, thereby eliminating parallax effects while maintaining system simplicity
2Reliability
If optical scattering elements are added to correct alignment issues, then sensitivity in close range is improved, but image quality is degraded due to optical scattering
Solution Approach 1:
The patent replaces optical scattering elements with a mechanically adjustable receiver element. Instead of using optical components to redirect or scatter light to improve close-range sensitivity, the system mechanically rotates or tilts the receiver to achieve proper alignment, thereby avoiding image quality degradation from optical scattering while still improving close-range detection sensitivity
3Measurement precision
If individual pixel alignment adjustment is implemented, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The receiver element is divided into multiple individually controllable pixels or pixel groups. Each pixel or group can be independently adjusted in orientation or activation state, allowing precise alignment for different spatial regions and detection ranges. This segmentation enables high detection accuracy while maintaining manageable system complexity through modular control
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 approach maintains sensitivity and image quality across both close and far ranges by correcting parallax and optimizing pixel usage, reducing energy consumption and enhancing detection accuracy.
Implementation Method 1
the receiver element is configured to record at least a first reflection of the emitted signal
Implementation Method 2
the sensor unit is configured to detect and/or receive a distance between the sensor unit and an object element
Data Source
AI summary
A sensor unit for a lidar measurement. The sensor unit including: an emitter element configured to emit at least one signal having a first orientation, a receiver element configured to record at least one reflection of the emitted signal having a second orientation, wherein the sensor unit is configured to detect and/or receive a distance between the sensor unit and an object element, wherein the sensor unit is configured to adjust the first orientation and/or the second orientation as a function of the distance.