Brightness Calibration for Optical Detection Systems with Diffusers
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Solution Overview
Problem
Conventional optical detection systems face issues with uniformity in light intensity from single source illuminators, leading to varying brightness values across detection sites, which are exacerbated by differences in diffuser transparencies and batch deviations, lacking a workable solution to address these discrepancies.
Innovation Solution
A brightness calibration method that involves detecting brightness values and transparencies at each detection site, selecting and disposing diffusers with larger transparencies over sites with smaller brightness values and smaller transparencies over sites with larger brightness values, and calculating uniformity and deviation ratios to optimize diffuser placement, ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If diffusers are disposed over detection sites to homogenize light, then light uniformity is improved, but detection deviations worsen due to varying diffuser transparencies and batch deviations
Solution Approach 1:
The patent applies local quality by individually measuring the transparency of each diffuser and matching it with specific detection sites based on their brightness characteristics. Instead of treating all diffusers equally, the system assigns diffusers with different transparency values to different detection sites according to their specific requirements, thereby compensating for both light uniformity and diffuser variation effects.
Solution Approach 2:
The patent changes the parameter of diffuser transparency selection based on measured brightness values at different detection sites. By measuring actual brightness and transparency parameters, the system dynamically determines which diffusers should be assigned to which detection sites, transforming a static configuration problem into a dynamic optimization problem that balances both light uniformity and detection precision.
2Device complexity
If single source illuminator is used to illuminate probe card, then device complexity is reduced, but light uniformity deteriorates due to intensity variation between central and peripheral regions
Solution Approach 1:
The patent introduces diffusers as intermediary elements between the single source illuminator and the detection sites. These diffusers act as mediators that transform the non-uniform light distribution from the single source into a more uniform distribution across the probe card, enabling the system to maintain simplicity while achieving uniformity.
Solution Approach 2:
The patent performs preliminary measurement and characterization of both the light distribution pattern from the single source illuminator and the transparency properties of individual diffusers before final assignment. This preliminary action enables the system to pre-calculate optimal diffuser-to-detection-site mappings, ensuring that the simple single-source configuration can still achieve uniform illumination through intelligent configuration.
3Stability of the object's composition
If diffusers with different transparencies are used to compensate for brightness variations, then light uniformity is improved, but manufacturing precision deteriorates due to batch deviations in diffuser production
Solution Approach 1:
The patent implements a feedback mechanism where the actual measured brightness values at detection sites and the measured transparency values of diffusers are used to verify and adjust the assignment configuration. This feedback loop allows the system to compensate for manufacturing variations by adapting the diffuser-to-site mapping based on actual measurements, thereby maintaining light uniformity despite batch deviations in diffuser production.
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 method effectively minimizes detection deviations caused by light uniformity, diffuser deviations, and site-specific variations, providing a rule to compensate for the non-uniform light distribution from single source illuminators and improving the accuracy of optical detection systems.
Implementation Method 1
sequentially detecting brightness values at the detection sites through one of a plurality of diffusers by a sensing chip
Implementation Method 2
sequentially detecting transparencies of the diffusers at one of the detection sites by the sensing chip
Implementation Method 3
diffusers disposed over the detection sites, so as to homogenize the light
Data Source
AI summary
A brightness calibration method used in an optical detection system includes a single source illuminator and a probe card. The single source illuminator is configured to illuminate the probe card. The probe card has a plurality of detection sites. The brightness calibration method includes: sequentially detecting brightness values at the detection sites through one of a plurality of diffusers by a sensing chip; sequentially detecting transparencies of the diffusers at one of the detection sites by the sensing chip; and selecting and respectively disposing the diffusers corresponding to larger ones of the transparencies over the detection sites corresponding to smaller ones of the brightness values, and selecting and respectively disposing the diffusers corresponding to smaller ones of the transparencies over the detection sites corresponding to larger ones of the brightness values.