Portable Crack Detection via Electrical Resistance Measurement
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Solution Overview
Problem
Current methods for detecting cracks in materials, such as X-ray radiography and X-ray CT scanning, are cumbersome, expensive, and not portable, making them unsuitable for field use in verifying the structural integrity of materials like ceramic armor plating used in body armor.
Innovation Solution
A measurement system with physically attached electronics that applies an electrical signal to a material and determines if a crack or defect is present based on measured voltage differences, using a programmable switch array and controller to simplify connections and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray scanning or X-ray CT scanning is used to detect cracks in materials, then measurement precision is improved, but device complexity and weight increase, making the equipment large and non-portable
Solution Approach 1:
The patent replaces the mechanical X-ray scanning system with an electrical measurement system. Instead of using X-ray equipment to detect cracks, the invention applies electrical signals to the material and measures voltage changes caused by cracks. This substitution of measurement principle dramatically simplifies the device while maintaining crack detection capability.
Solution Approach 2:
The patent uses simple, inexpensive electrical components (contacts, wires, power source) instead of expensive X-ray equipment. The measurement system can be easily deployed and replaced if needed, making it suitable for field use where portability and cost are concerns.
2Measurement precision
If X-ray scanning is used to detect cracks in materials, then measurement precision is improved, but the equipment becomes expensive and slow
Solution Approach 1:
The electrical measurement system operates much faster than X-ray scanning. Electrical signals can be applied and measured almost instantaneously, eliminating the slow scanning process of X-ray equipment. This enables rapid testing of materials in field conditions.
Solution Approach 2:
The measurement system can rapidly apply electrical signals in periodic sequences to different locations on the material, enabling fast comprehensive testing. Multiple measurements can be performed quickly by systematically varying the contact positions and signal parameters.
3Measurement precision
If multiple electrical contacts are distributed about the material for measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The programmable switch array serves multiple functions: it connects different electrical contacts to the measurement device, controls signal routing, and enables various measurement configurations. This single multi-functional component replaces what would otherwise require multiple separate connection devices, reducing overall system complexity.
Solution Approach 2:
The use of programmable switches allows the electrical connection configuration to be dynamically changed without physical reconnection. The system can adaptively reconfigure which contacts are active and how they are connected, providing measurement flexibility while maintaining simple physical connections.
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 approach allows for quick, portable, and cost-effective detection of cracks in materials, offering sufficient accuracy for field use without the need for large, expensive equipment.
Implementation Method 1
The controller may be configured to cause an electrical signal to be applied to a pair of drive electrical contacts from the plurality of electrical contacts and cause a measured voltage to be determined using a pair of measurement electrical contacts
Data Source
AI summary
A method may include coupling a first electrical connector of an article to a second electrical connector of a measurement device. The article may include a tested material, the first electrical connector, and a plurality of electrical contacts electrically connected to the first electrical connector. The measurement device may include a power source and a user interface. The method also may include causing, by a controller, an electrical signal to be applied to a pair of drive electrical contacts from the plurality of electrical contacts. The method further may include receiving, by the controller, from an analog-to-digital converter, a measured voltage measured using a measurement electrical contact from the plurality of electrical contacts. The method also may include determining, by the controller, whether the tested material includes a crack or other defect based on the measured voltage.