LiDAR Trigger Signal Isolation for Back Reflection-Free Testing
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Solution Overview
Problem
Existing LiDAR sensor testing methods face issues with trigger signal reflection off surrounding surfaces, leading to undesired detection results and falsification of synthetic reflections.
Innovation Solution
A device and method using a converging lens and optical elements, such as a Faraday isolator or λ/4 waveplate, to isolate the trigger signal by allowing it to pass while absorbing back reflections, ensuring the signal generator generates a simulated reflection below the LiDAR sensor's detection threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a signal generator is used to test LiDAR sensors, then the trigger signal can be generated and controlled, but the trigger signal reflects off surrounding surfaces and is detectable by the receiver unit, leading to falsification of test results
Solution Approach 1:
An optical element (such as a beam blocker or absorber) is introduced as an intermediary component between the trigger transmitter and the receiver. This intermediary blocks or absorbs the reflected trigger signal before it can reach the receiver, preventing falsification of test results while allowing the test system to function properly.
Solution Approach 2:
The harmful reflected trigger signal is extracted and blocked from the receiver path. By removing the reflected signal from the system through the optical element, the test accuracy is preserved without requiring modification of the LiDAR sensor itself.
2Productivity
If the trigger signal is allowed to pass through the test system, then the LiDAR sensor can be tested, but back reflections from surrounding surfaces interfere with the synthetic reflection generation
Solution Approach 1:
The optical element serves as a mediator that allows the trigger signal to pass through to the LiDAR sensor for testing while simultaneously blocking back reflections from surrounding surfaces. This enables full testing capability without interference from environmental reflections.
3Reliability
If optical elements are added to block reflections, then trigger signal isolation is improved, but the device complexity increases
Solution Approach 1:
The patent employs simple, inexpensive optical elements such as beam blockers or absorbers that can be easily integrated into the test system. These straightforward components provide effective trigger signal isolation without requiring complex or expensive optical systems, thus minimizing the increase in device complexity.
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
Effectively isolates the trigger signal, reducing back reflections to undetectable levels, thus ensuring accurate testing without sensor-specific modifications.
Implementation Method 1
an optical element which is arranged in a signal path of the trigger signal before the converging lens or the trigger detector and which is designed to allow the trigger signal to pass and to at least partially absorb a back reflection, in particular reflected off a surface, of the trigger signal that has passed through the optical element
Implementation Method 2
a converging lens, connectable to a trigger detector via an optical transmission medium, or a trigger detector, wherein the converging lens or the trigger detector is configured to receive a trigger signal
Data Source
AI summary
A device and to a method for isolating a trigger signal for a test system of a LiDAR sensor, having an optical element, which is arranged in a signal pat of the trigger signal before a converging lens or a trigger detector and which is designed to allow the trigger signal to pass and to at least partially absorb a back reflection, in particular reflected off a surface, of the trigger signal that has passed through the optical element. A test system for a LiDAR sensor is also provided.