Low Tg Polymer Ultrasonic Coupling for Harsh Environments
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Solution Overview
Problem
Current ultrasonic coupling materials for long-term monitoring of pipes and structures in harsh environments, such as those in the oil and gas industry, face challenges including high temperature stability, chemical compatibility, and the need for repositioning of transducers without damage, while existing solutions often require high coupling forces, are costly, or suffer from low sensitivity.
Innovation Solution
A low glass transition temperature (Tg) polymer material with favorable acoustic impedance and chemical compatibility is used as an ultrasonic coupling agent, which remains in a viscous/viscoelastic state within the operating temperature range, providing stable and removable coupling between the transducer and the structure, allowing for repositioning without damage and maintaining acoustic integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ultrasonic coupling materials are used for long-term monitoring, then acoustic coupling is achieved, but the material fails under high temperature and chemical exposure
Solution Approach 1:
The patent changes the fundamental parameters of the coupling material by using a polymer with glass transition temperature (Tg) substantially below the operating temperature range. This ensures the material remains in a viscous/viscoelastic state at operating temperatures, providing stable acoustic coupling while maintaining chemical stability and resistance to degradation under harsh conditions including high temperature and chemical exposure.
Solution Approach 2:
The invention uses a composite approach by selecting a polymer material with specific properties (low Tg, appropriate viscosity, chemical compatibility) that combines multiple desirable characteristics: acoustic coupling capability, thermal stability, chemical resistance, and repositioning ability. This composite material strategy resolves the contradiction between long-term stability and resistance to harmful environmental factors.
2Reliability
If high coupling forces are used to maintain acoustic coupling, then coupling stability is improved, but transducer repositioning becomes difficult and may cause damage
Solution Approach 1:
The patent applies dynamics by selecting a polymer material that remains in a viscous/viscoelastic state at operating temperatures. This dynamic property allows the material to provide stable acoustic coupling under normal conditions while enabling transducer repositioning when needed, as the viscoelastic nature allows for controlled deformation and repositioning without damage to the transducer.
Solution Approach 2:
By changing the temperature parameter relative to the polymer's glass transition temperature, the material exhibits different mechanical properties. At operating temperatures (above Tg), the material is soft and viscous, allowing easy repositioning. The material maintains stable coupling through its viscoelastic properties without requiring excessive coupling forces, thus resolving the contradiction between coupling stability and repositioning ease.
3Adaptability or versatility
If manual positioning of transducer is required for each reading, then measurement flexibility is maintained, but operator safety and measurement consistency deteriorate
Solution Approach 1:
The patent applies preliminary action by using a coupling material that maintains consistent acoustic properties over long periods and across temperature variations. This preliminary establishment of stable coupling conditions eliminates the need for repeated manual positioning and adjustments, ensuring measurement consistency while maintaining the flexibility to install sensors in various locations. The material's stability ensures that once positioned, the transducer provides consistent readings without requiring operator intervention for repositioning.
4Reliability
If permanent installation of sensors is implemented, then operator safety and measurement consistency are improved, but coupling material longevity under harsh conditions deteriorates
Solution Approach 1:
The patent fundamentally changes the parameter of material selection by using a polymer with glass transition temperature substantially below the operating temperature range. This parameter change ensures the material remains chemically stable and physically stable under harsh conditions including high temperature and chemical exposure, thereby extending the longevity of the coupling material for permanent installations while maintaining measurement consistency over extended periods.
Solution Approach 2:
The invention employs a composite material strategy by selecting a polymer that combines multiple properties: low glass transition temperature, appropriate viscosity, chemical inertness, and thermal stability. This composite approach creates a coupling material that can withstand harsh environmental conditions for extended periods, resolving the contradiction between permanent installation requirements and material longevity under harsh conditions.
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 solution ensures long-term stable acoustic coupling, chemical stability, and the ability to reposition transducers without harm, addressing the limitations of existing materials by maintaining acoustic and mechanical properties across a wide temperature range and withstanding chemical exposure.
Implementation Method 1
the coupling agent having a glass transition temperature (Tg) below the operating temperature range and below the installation temperature, the coupling agent being in a viscous/viscoelastic state over the operating temperature range
Implementation Method 2
the coupling agent being in a viscous/viscoelastic state over the operating temperature range
Implementation Method 3
the probe, in turn, generates an ultrasonic pulse which is transmitted through an ultrasonic coupling material and then the structure. The probe also receives an echo of the ultrasonic pulse from the structure and through the ultrasonic coupling layer
Implementation Method 4
providing stable and removable coupling between the transducer and the structure, allowing for repositioning without damage and maintaining acoustic integrity
Data Source
AI summary
A method of releasably adhering an ultrasonic sensor to a structure, the structure having an operating temperature range, the method comprising: applying a coupling agent between the structure and the sensor at an installation temperature, the coupling agent having a glass transition temperature (Tg) below the operating temperature range and below the installation temperature, the coupling agent being in a viscous/viscoelastic state over the operating temperature range; and urging the sensor against the structure with the coupling agent therebetween such that the sensor adheres to the structure.