Photon Emitter Array for Polarized Surface Inspection
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Solution Overview
Problem
Existing surface inspection methods for articles, such as hard disk drives, often fail to detect defects like particle and stain contaminations due to insufficient light intensity caused by the use of external polarization filters, which reduce the broad-spectrum light to a level that is not sufficient for defect detection.
Innovation Solution
An apparatus with a photon emitter array that can change polarization orientation and wavelength, allowing for customizable emission of specific polarized photons to detect surface features without losing intensity, using self-polarized photon emitters to irradiate articles with coherent and polarized photons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external polarization filters are used to provide polarized light for inspection, then polarization information is obtained, but light intensity is reduced to insufficient levels for defect detection
Solution Approach 1:
The patent extracts the polarization function from external filters and integrates it directly into the light source. Each photon emitter in the array inherently generates polarized light through its physical structure (such as edge-emitting lasers or LEDs with polarizing elements), eliminating the need for separate polarization filters that would attenuate the light intensity.
Solution Approach 2:
The photon emitters are designed to self-generate polarized light without requiring external polarization components. The emission structure itself provides the polarization function, making the system self-sufficient and avoiding the intensity loss that would result from using external filters.
2Productivity
If randomly polarized light or filtered polarized light is used, then inspection can be performed, but defect detection capability is insufficient due to inadequate light intensity
Solution Approach 1:
The patent divides the illumination system into multiple independent photon emitters, each capable of emitting polarized light at specific orientations. This segmentation allows different emitters to target different polarization angles, providing comprehensive coverage of surface features while maintaining high intensity levels through the collective output of multiple high-power emitters.
Solution Approach 2:
The system enables dynamic adjustment of polarization orientation and wavelength parameters across different photon emitters. By varying these parameters, the inspection system can optimize light interaction with specific defect types, enhancing detection capability while maintaining sufficient intensity through coordinated emission from multiple emitters.
3Adaptability or versatility
If polarization filters are introduced to achieve polarized light emission, then polarization orientation is controlled, but the broad-spectrum light is reduced to insufficient intensity levels
Solution Approach 1:
The patent merges the light generation and polarization functions into a single integrated photon emitter unit. Each emitter combines the light source with embedded polarizing elements, eliminating the need for separate filters and thereby maintaining high light intensity while providing controlled polarization orientation.
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
Enables the detection and analysis of surface features without reducing light intensity, effectively identifying defects that would otherwise go undetected, improving the inspection process by customizing polarization and wavelength to match known defect scattering characteristics.
Implementation Method 1
at least two photon emitters, each with a preselected polarization orientation, and configured to emit polarized photons onto a surface of an article
Implementation Method 2
process photon-detector signals corresponding to photons scattered from surface features of the article
Data Source
AI summary
Provided herein is an apparatus, including at least two photon emitters, each with a preselected polarization orientation, and configured to emit polarized photons onto a surface of an article, and a processing means configured to process photon-detector-array signals corresponding to photons scattered from surface features of the article, and generate one or more surface features maps for the article from the photon-detector-array signals corresponding to the photons scattered from the surface features of the article.