Multimodal PCB Inspection for Rapid Defect and Counterfeit Detection
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Solution Overview
Problem
Existing non-destructive analysis techniques for printed circuit boards (PCBs) are inefficient in detecting flaws and ensuring compliance with specifications, particularly in identifying counterfeit components and verifying performance criteria, due to long test times and limited ability to detect certain types of defects.
Innovation Solution
A multispectral inspection system utilizing a combination of visible, terahertz, infrared, and electromagnetic interference imaging modalities, along with artificial intelligence classifiers, to acquire and process three-dimensional signatures of PCBs, enabling rapid non-destructive characterization and verification of component authenticity and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing non-destructive analysis techniques are used to inspect PCBs, then the inspection process is non-destructive and can be performed on installed items, but the test times are long and the ability to detect certain types of defects is limited
Solution Approach 1:
The inspection system segments the PCB into multiple regions of interest and applies different imaging modalities to different regions simultaneously. The system divides the inspection task into multiple parallel processes using different scanning modalities (optical, terahertz, infrared, electromagnetic interference) to inspect different aspects of the PCB concurrently, thereby reducing total inspection time while maintaining comprehensive defect detection capability.
Solution Approach 2:
The system merges multiple imaging modalities (optical, terahertz, infrared, and electromagnetic interference scanning) into a single integrated inspection platform. By combining these different scanning techniques that detect different types of defects, the system achieves comprehensive defect detection coverage while performing inspections in parallel to reduce overall test time.
2Reliability
If multiple imaging modalities are used to improve defect detection capability, then the ability to detect various types of defects is enhanced, but the system complexity increases
Solution Approach 1:
The inspection system is designed as a universal platform that performs multiple inspection functions using different imaging modalities. Each scanning modality (optical, terahertz, infrared, electromagnetic interference) serves multiple purposes: detecting different defect types, inspecting different PCB layers, and providing complementary information. This multi-functionality approach consolidates what would otherwise require separate inspection systems into a single unified platform.
Solution Approach 2:
The system introduces an intermediary processing layer that coordinates the multiple imaging modalities and integrates their outputs. The control system acts as an intermediary that manages the complex interactions between different scanners, synchronizes data acquisition, and processes the multi-modal data streams into unified inspection results, thereby managing system complexity through centralized coordination.
3Reliability
If comprehensive testing is performed to ensure compliance with specifications, then the reliability and performance verification are improved, but the inspection time and resource consumption increase
Solution Approach 1:
The system implements periodic action by applying different test vectors in sequence to power the PCB under test in different operational states. By periodically switching between multiple test vectors that simulate different operating conditions, the system comprehensively verifies performance specifications while maintaining efficient inspection throughput through structured, repeating test cycles.
Solution Approach 2:
The system performs preliminary identification of regions of interest using initial scanning before applying comprehensive multi-modal inspection to those specific areas. By first identifying potential defect locations or areas requiring detailed inspection, the system can then focus comprehensive testing resources on those specific regions, ensuring thorough performance verification while avoiding unnecessary inspection of already-verified areas, thus maintaining high productivity.
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 system provides rapid and accurate verification of PCB components, detecting defects and counterfeits, ensuring compliance with specifications and improving the reliability of electronic devices.
Implementation Method 1
an optical imaging scanner configured to scan the associated electronic item... control the optical imaging scanner to acquire an optical image of the associated electronic item
Implementation Method 2
The functional imaging scanner is configured to scan the associated electronic item... acquire one or more functional images of the associated electronic item powered in accord with respective one or more test vectors
Implementation Method 3
A multispectral inspection (MSI) system utilizing a combination of visible, terahertz, infrared, and electromagnetic interference imaging modalities
Data Source
AI summary
A multispectral inspection (MSI) device for analyzing an electronic item having a printed circuit board (PCB). An electronic power supply powers the electronic item in accordance with one or more test vectors. An optical imaging scanner, terahertz (THz) imaging scanner, and a functional imaging scanner are each operative to scan the electronic item. An electronic processor is programmed to scan the various scanners and control the power supply to acquire optical, THz, and functional images of the electronic item. The images are combined to form a standard three-dimensional (3D) signature and artificial intelligence (AI) classifiers are applied to the 3D signature to perform non-destructive analyses of the electronic item.