Ultrasonic Corrosion Monitoring Using Delay Line Synchronization
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Solution Overview
Problem
Current corrosion monitoring systems using piezoelectric transducers face challenges in accurately measuring the remaining wall thickness and corrosion rate of pipelines due to scattering of ultrasonic energy by corrosion patches, leading to inefficient and costly continuous monitoring, especially in low-corrosion-rate areas where long periods are required to capture appreciable changes.
Innovation Solution
The technology employs advanced ultrasonic thickness gauging methods involving multiple readings, delay lines, and curve fitting techniques to synchronize reflected signals, allowing for precise measurement of thickness changes at the micron level, thereby reducing the time required to determine corrosion rates and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultrasonic transducers are used for corrosion monitoring, then continuous monitoring can be performed, but the measurement precision deteriorates due to scattering of ultrasonic energy by corrosion patches
Solution Approach 1:
The patent segments the ultrasonic measurement process into multiple discrete readings taken at different time points, rather than relying on a single continuous measurement. By taking multiple thickness measurements over time and analyzing the rate of change, the system achieves accurate corrosion rate monitoring even when individual measurements are affected by scattering from corrosion patches.
Solution Approach 2:
The patent applies preliminary action by performing multiple baseline thickness measurements before significant corrosion occurs, establishing a reference profile. This preliminary data is then used to detect and quantify subsequent corrosion by comparing against the established baseline, enabling early detection and accurate rate calculation.
2Measurement precision
If continuous monitoring is implemented to capture corrosion changes, then the corrosion rate can be determined, but the time required increases significantly in low-corrosion-rate areas
Solution Approach 1:
The patent implements periodic action by taking thickness measurements at regular intervals rather than continuously. By establishing a measurement schedule (e.g., monthly or quarterly readings) and analyzing the trend of thickness loss over these periodic measurements, the system accurately determines corrosion rates without requiring constant monitoring, significantly reducing time investment while maintaining precision.
Solution Approach 2:
The patent applies feedback by continuously comparing new thickness measurements against previous measurements and the calculated corrosion rate. When the measured corrosion rate deviates from the predicted rate based on environmental conditions and material properties, the system triggers increased monitoring frequency or alerts operators, allowing accurate corrosion rate determination with adaptive time investment rather than fixed continuous monitoring.
3Measurement precision
If multiple readings and curve fitting techniques are used to synchronize reflected signals, then the measurement precision improves to ±10 microns, but the device complexity increases
Solution Approach 1:
The patent introduces an intermediary reference signal (delay line) that provides a stable timing reference for synchronizing the ultrasonic reflected signals. By using this intermediary reference, the system can accurately align multiple readings taken at different times, enabling precise measurement of thickness changes through curve fitting without requiring complex direct synchronization methods.
Solution Approach 2:
The patent applies copying by creating a reference copy of the ultrasonic signal waveform from a known good state (using the delay line). This reference copy is then used to compare against subsequent waveforms, allowing the system to detect and quantify thickness changes by measuring deviations from the reference pattern, achieving high precision through pattern matching rather than complex absolute measurements.
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 enables accurate corrosion rate measurement within weeks or months, compared to years, with an uncertainty of ±10 microns, allowing for timely predictive maintenance and reducing the need for continuous monitoring, thus enhancing operational efficiency and cost-effectiveness.
Implementation Method 1
When the ultrasonic waves reach a corrosion 61 (or other discontinuity in the crystal lattice), a reflected ultrasonic wave is generated. These reflected waves can be detected by the same generating PZT element or by a different receiver that is also a PZT.
Implementation Method 2
The piezoelectric transducer includes a vibrating crystal 10... The vibrating crystal 10 is electrically powered through cable 14... At the receiving PZT, the reflected ultrasonic waves cause a reverse piezo-effect, which can be measured to detect the intensity of the returning ultrasound.
Implementation Method 3
generating a first initial pulse into the specimen by an ultrasonic transducer including a delay line... generating a second initial pulse into the specimen by the ultrasonic transducer
Data Source
AI summary
Systems and methods for determining rate of corrosion in pipes and other structures are disclosed herein. In one embodiment, a method for measuring a rate of corrosion progress in a specimen includes: generating a first initial pulse into the specimen by an ultrasonic transducer, and acquiring a first reflected waveform from the specimen. The first reflected waveform includes a first reflection of the first waveform and a second reflection of the first waveform. The method also includes generating a second initial pulse into the specimen by the ultrasonic transducer. The first initial pulse and the second initial pulse are separated by a time period. The method also includes acquiring a second reflected waveform from the specimen. The second reflected waveform includes a first reflection of the second waveform and a second reflection of the second waveform.