Photon Detector Array for Magnetic Feature Mapping
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Solution Overview
Problem
Existing methods fail to effectively inspect articles for surface and magnetic features, including defects that can degrade performance, particularly in manufacturing processes like hard disk production, where defects like scratches, voids, and magnetic anomalies are difficult to detect accurately.
Innovation Solution
An apparatus comprising a photon emitter and a photon detector array that emits photons onto an article's surface and receives scattered photons to map both surface and magnetic features, utilizing optical components and rotational stages for comprehensive feature detection and differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used, then the inspection process is simple, but the detection precision for magnetic features is insufficient
Solution Approach 1:
The apparatus segments the detection process into two distinct functional paths: one for surface features using reflected light detection, and another for magnetic features using scattered light detection. This segmentation allows each detection path to be optimized independently, achieving high precision for both surface and magnetic feature detection without requiring a single overly complex system.
Solution Approach 2:
The invention adds a new detection dimension by introducing scattered light detection at a different angular dimension (45 degrees from normal) compared to conventional reflected light detection (15 degrees from normal). This dimensional change in detection geometry enables the system to access magnetic feature information that is invisible to conventional inspection methods.
2Adaptability or versatility
If conventional reflected light detection is used, then the detection method is simple, but magnetic features cannot be detected
Solution Approach 1:
The apparatus achieves multi-functionality by integrating both surface feature detection and magnetic feature detection capabilities into a single inspection system. The dual detection paths (reflected light for surface features, scattered light for magnetic features) work simultaneously, allowing the apparatus to perform multiple detection functions without requiring separate inspection equipment.
Solution Approach 2:
The invention introduces scattered photons as an intermediary mechanism to detect magnetic features. Instead of directly detecting magnetic fields, the system uses photons that scatter when interacting with magnetic domains on the disk surface. This intermediary approach enables magnetic feature detection through optical means, bridging the gap between optical detection capabilities and magnetic property measurement.
3Manufacturing precision
If high precision detection of both surface and magnetic features is achieved, then product quality improves, but the inspection time increases
Solution Approach 1:
The apparatus maintains continuous inspection capability by implementing simultaneous dual-path detection. Both reflected light detection (for surface features) and scattered light detection (for magnetic features) occur concurrently during a single disk rotation cycle, eliminating the need for sequential inspection processes and maintaining high detection accuracy without time penalty.
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 precise detection and mapping of surface and magnetic features, improving product quality by identifying defects and anomalies, thereby correcting manufacturing trends and enhancing performance reliability.
Implementation Method 1
a photon detector array configured to receive photons scattered from surface features and magnetic features of the article
Data Source
AI summary
Provided herein is an apparatus including a photon emitter configured to emit photons onto a surface of an article. In addition, the apparatus includes a photon detector array configured to receive photons scattered from surface features and magnetic features of the article. The photon detector array is configured to provide information for mapping the magnetic features.