Light-Emitting Apparatus Phosphor Damage Localization
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Solution Overview
Problem
Conventional LARP systems face difficulties in accurately detecting minor damage to the phosphor body, leading to potential malfunctions and safety issues, as existing methods struggle to differentiate between minor and severe damage effectively.
Innovation Solution
A light-emitting apparatus featuring a semiconductor light source, a deflection device to scan the phosphor body, and an evaluation device that correlates measurement signals from light detectors with specific positions on the phosphor body to identify and localize damage, enabling precise detection and triggering appropriate actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light detectors are used to detect phosphor damage, then the system can detect major damage, but minor damage cannot be accurately detected and localized
Solution Approach 1:
The patent divides the phosphor body into multiple detectable positions by using a scanning system with deflection device. The light detector scans different positions on the phosphor body sequentially, allowing damage to be localized to specific regions rather than just detecting overall phosphor failure. This segmentation enables precise identification of damaged areas.
Solution Approach 2:
The evaluation device receives measurement signals from the light detector and provides feedback about the detected light intensity at each position. By comparing the measured light intensity with expected values, the system can identify deviations indicating damage and localize them to specific positions on the phosphor body.
2Reliability
If the LARP system is switched off or reduced to emergency operation upon detecting phosphor damage, then safety is ensured, but the system cannot distinguish between minor and severe damage
Solution Approach 1:
The patent applies local quality by correlating measurement signals with specific positions on the phosphor body. This allows the system to identify whether damage is localized to a small region or affects the entire phosphor body. Based on the extent and location of damage, the evaluation device can determine appropriate system responses, enabling differentiated reactions to minor versus severe damage.
3Reliability
If two light detectors are used to detect phosphor failure by comparing signal ratios, then safety switch-off can be triggered, but the method is complex and cannot localize damage
Solution Approach 1:
The patent extracts the position information from the scanning process itself. By correlating the measurement signals with the known scan path and positions, the system obtains spatial information about damage without requiring multiple detectors. This approach simplifies the detection system while enabling damage localization.
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 solution allows for accurate localization of damage on the phosphor body, enabling timely and effective responses to ensure safety and maintain system functionality, even in cases of minor damage, thereby enhancing the reliability and safety of light-emitting systems like vehicle headlights.
Implementation Method 1
a wavelength-converting phosphor is illuminated across a large area by a stationary blue laser beam ('primary light beam') and in the process converts the laser light partially into yellow light ('secondary light')
Implementation Method 2
a deflection device for deflecting the at least one primary light beam onto respectively associated different positions on a phosphor body
Implementation Method 3
at least one light detector for detecting light that was emitted by the phosphor body
Data Source
AI summary
In various embodiments, a light-emitting apparatus is provided. The light-emitting apparatus includes at least one semiconductor light source configured to emit at least one primary light beam, a deflection device configured to deflect the at least one primary light beam onto respectively associated different positions on a phosphor body, at least one light detector configured to detect light that was emitted by the phosphor body, and an evaluation device. The evaluation device is configured to identify damage to the phosphor body on the basis of at least one measurement signal generated by the at least one light detector, and to correlate the at least one measurement signal with at least one position on the phosphor body.