Optical Power Inspection Device Using Reference Emitter Calibration
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Solution Overview
Problem
Existing methods for inspecting the optical power of light emitters, particularly in gaze trackers, lack the necessary accuracy and reliability to ensure safety standards for human eye protection.
Innovation Solution
A device and method that utilize a reference light emitter, an integrating sphere, a photodiode detector, and a controller to measure and calculate the average and standard deviation of optical power from inspection target light emitters, generating an alarm if the measurements exceed predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical power measurement methods are used, then measurement speed is acceptable, but measurement accuracy and reliability are insufficient to ensure safety standards
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the measurement system using a reference light emitter with known optical power characteristics before actual measurements. The controller stores reference values and uses them to compensate for systematic errors in subsequent measurements, thereby improving accuracy without adding complex real-time correction mechanisms.
Solution Approach 2:
The patent implements feedback by continuously comparing measured optical power values against stored reference values from the reference light emitter. The controller adjusts measurements based on this comparison, compensating for drift and errors in the measurement system. This feedback mechanism enhances measurement reliability while maintaining a relatively simple device architecture.
2Reliability
If multiple measurements are performed to improve accuracy, then measurement reliability increases, but inspection time increases
Solution Approach 1:
The system performs preliminary calibration measurements using the reference light emitter to establish baseline values before production inspection. This preliminary action allows the system to quickly assess subsequent measurements against known standards, achieving high reliability without requiring extensive repeated measurements for each product unit.
Solution Approach 2:
The patent uses a reference light emitter that replicates the optical characteristics of the actual light emitters being inspected. By measuring the reference copy under identical conditions, the system achieves reliable measurements without needing to perform multiple measurements on each actual product, thereby maintaining inspection speed.
3Measurement precision
If a reference light emitter is introduced for calibration, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The reference light emitter serves multiple functions: it calibrates the measurement system, provides reference values for comparison, and validates measurement consistency over time. This multi-functionality allows a single additional component to address multiple sources of measurement error without proportionally increasing system complexity.
Solution Approach 2:
The reference light emitter acts as an intermediary standard between the measurement system and the actual light emitters being inspected. It mediates the measurement process by providing a known reference point that the controller uses to correct and validate measurements, thereby improving accuracy without directly modifying the measurement of actual products.
4Object-affected harmful factors
If optical power measurement is performed with high accuracy, then safety standards are met, but measurement system complexity increases
Solution Approach 1:
The system performs preliminary safety validation by measuring the reference light emitter's optical power and comparing it against safety thresholds before production inspection. This preliminary safety check ensures the measurement system is properly calibrated for safety-critical measurements without requiring complex real-time safety monitoring during each product measurement.
Solution Approach 2:
The controller implements feedback by continuously comparing measured optical power values against predetermined safety thresholds. When measurements approach or exceed safety limits, the system generates warnings or stops operation, providing a simple yet effective safety mechanism that does not require complex real-time control systems.
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
The solution provides a more accurate and reliable inspection of optical power, ensuring that light emitters meet safety standards for human eye protection by periodically measuring and comparing the optical power of inspection target light emitters to a reference light emitter.
Implementation Method 1
a measurer configured to measure optical power by receiving light emitted from one of the reference light emitter and a plurality of inspection target light emitters, the measurer including an integrating sphere, a photodiode detector
Data Source
AI summary
Disclosed is a device for inspecting optical power measurement of a light emitter, the device including: a reference light emitter; a measurer configured to measure optical power by receiving light emitted from one of the reference light emitter and a plurality of inspection target light emitters, the measurer including an integrating sphere, a photodiode detector, and a photocurrent or photovoltage measurement device; and a controller configured to calculate a first average of optical power of the plurality of inspection target light emitters by measuring first optical power of a first inspection target light emitter among the plurality of inspection target light emitters, and generate an alarm to stop using the measurer when a difference between the first average and a second optical power of the reference light emitter exceeds a first threshold. Thus, the inspection is more accurately and reliably carried out.