Optical Strain Monitoring for Pressure Device Wall Damage
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Solution Overview
Problem
Existing pressure devices, particularly those with vibration-type transducers, face challenges in detecting minor structural changes or damage to their walls, such as wear or plastic deformation, which can affect measurement accuracy and compressive strength, without relying on vibration signals, and current methods are limited to specific measuring systems and may produce false alarms.
Innovation Solution
A measuring system that monitors the structural integrity of pressure devices by detecting expansion changes in spatially distant wall segments using strain sensors and converter electronics, allowing for early detection of damage through strain signal analysis, even with small changes, and provides a damage value to assess the remaining service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration signals are used to detect wall damage in pressure devices, then measurement sensitivity can be improved, but the method is limited to specific measuring systems and may produce false alarms
Solution Approach 1:
The patent replaces vibration-based mechanical measurement with an optical measurement system. A camera captures images of the pressure device wall, and image processing algorithms analyze surface changes to detect damage. This substitution eliminates the limitation of vibration methods being applicable only to specific measuring systems while maintaining high detection sensitivity.
Solution Approach 2:
The patent introduces an optical intermediary (camera and light field) between the pressure device wall and the detection system. Instead of directly measuring vibrations, the system captures optical images of the wall surface, processes these images to identify surface changes, and thereby detects damage. This intermediary approach enables universal application across different pressure device types.
2Measurement precision
If thin-walled measuring tubes are used to increase vibration signal sensitivity, then measurement accuracy improves, but the compressive strength and damage resistance decrease
Solution Approach 1:
The patent replaces the mechanical vibration measurement system with an optical imaging system. This eliminates the need for thin-walled measuring tubes required for vibration sensitivity, allowing the use of thicker, stronger walls that can withstand higher compressive loads while maintaining damage detection capability through optical surface analysis.
Solution Approach 2:
The patent extracts the measurement function from the structural wall itself (which would require thin walls for vibration sensitivity) and relocates it to an external optical system. The camera and image processing system perform the damage detection function externally, allowing the wall to be optimized for strength rather than measurement sensitivity.
3Reliability
If strain sensors are placed on wall segments to detect expansion changes, then damage detection capability improves, but the device complexity increases
Solution Approach 1:
The patent employs a camera system that serves multiple functions: it captures images for damage detection, can monitor surface deformation, and provides visual documentation. This multi-functional approach achieves reliable damage detection without the complexity of specialized strain sensors, wiring, and signal conditioning circuits required by traditional sensor arrangements.
Solution Approach 2:
The patent creates an optical copy (image) of the wall surface and performs damage analysis on this copy rather than directly measuring physical quantities with sensors. The camera captures a visual replica of the wall, and image processing algorithms analyze this copy to detect surface changes, simplifying the physical measurement system while maintaining detection reliability.
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 reliable detection of minor damage to pressure device walls, preventing critical failures by quantifying damage and predicting the remaining service life, thus ensuring operational safety and accuracy without the limitations of vibration-based methods.
Implementation Method 1
detecting expansion changes in spatially distant wall segments using strain sensors
Data Source
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AI summary
The method serves for monitoring and/or checking a pressure device having a lumen surrounded by a wall for conveying and/or storing a fluid. To this end, the method comprises a step of registering both a strain of a first wall segment as well as also a strain of at least a second wall segment spaced from the first wall segment, for ascertaining a strain deviation value representing a difference between the strain of the first wall segment and the strain of the second wall segment, as well as a step of using the strain deviation value for ascertaining damage to the wall, as a result of plastic deformation of the wall and/or as a result of wear of the wall. The measuring system of the invention comprises supplementally to the pressure device a first strain sensor affixed on the first wall segment for producing a first strain signal dependent on a time variable strain of the first wall segment as well as at least a second strain sensor affixed on the second wall segment for producing a second strain signal dependent on a time variable strain of the second wall segment. Moreover, the measuring system comprises a transmitter electronics electrically coupled both with the first strain sensor as well as also the second strain sensor. The transmitter electronics is adapted to receive both the first strain signal as well as also the second strain signal as well as to ascertain, with application of the strain signals, damage to the wall.