Rotating Infrared Light Module Test for 3D Uniformity Mapping
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Solution Overview
Problem
Current methods for testing light modules in autonomous vehicles are either resource-intensive or labor and time-intensive, as they require a large number of photodiodes to capture a 360-degree illumination pattern, which is inefficient for verifying light distribution to the edges of the cabin.
Innovation Solution
A system with a mounting platform that rotates and holds a light-emitting module, combined with a housing containing a plurality of photodiodes arranged in an array over a 90-degree arc of a hemisphere, allows for efficient testing by sensing directional light intensities and producing a three-dimensional light distribution map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photodiodes are arranged to cover a 360-degree illumination pattern, then complete light distribution measurement is achieved, but the number of photodiodes and device complexity increases significantly
Solution Approach 1:
The photodiode array is segmented into multiple independent photodiodes arranged along an arc, where each photodiode measures light intensity at a specific angular position. This segmentation allows complete 360-degree coverage to be achieved through rotation rather than requiring all photodiodes to be present simultaneously, reducing device complexity while maintaining measurement completeness
Solution Approach 2:
The system employs dynamic rotation of the photodiode array or mounting platform to achieve comprehensive light distribution measurement. By rotating the array through different angular positions, the system can map the complete illumination pattern over time, replacing the need for a static large-scale photodiode array with a smaller dynamic system
2Measurement precision
If multiple measurement locations are tested sequentially to construct a three dimensional illumination pattern, then complete illumination coverage is verified, but testing time increases
Solution Approach 1:
The system maintains continuous measurement action during rotation, with photodiodes continuously detecting light intensity as the array rotates through different angular positions. This continuous measurement approach eliminates the need to stop and reposition between measurements, constructing the three-dimensional illumination pattern in a single continuous operation rather than through sequential discrete measurements
Solution Approach 2:
Rotation during measurement allows the system to capture illumination data across multiple angular positions simultaneously in one operation. The dynamic rotation enables the photodiode array to sweep through the complete field of view, collecting three-dimensional illumination data continuously rather than requiring sequential testing at discrete locations
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 enables concurrent testing of 360 and 180-degree light patterns, ensuring adequate light reaches the edges of the cabin, improving imaging quality and reducing testing time and resource requirements.
Implementation Method 1
sensing, with the photodiodes, a plurality of directional light intensities of the light emitted from the light-emitting module
Data Source
AI summary
Example embodiments described herein involve a system for testing a light-emitting module. The light-emitting module may include a mounting platform configured to hold a light-emitting module for a camera. The mounting platform may also be configured to rotate. The system may further include a housing holding a plurality of photodiodes arranged in an array over at least a 90 degree arc of a hemisphere. The system may also include a controller configured to control the photodiodes and the rotation of the mounting platform.