Carbon Nanotube RF Sensor for Host Material Length Monitoring
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Solution Overview
Problem
Conventional sensors face difficulties in accurately measuring dimensional changes in materials within hostile and dynamic environments, as they often require robust equipment that can alter material properties or compromise the integrity of the host material, and are prone to disruption in harsh conditions.
Innovation Solution
A carbon nanotube (CNT) bundle coupled with a radio frequency (RF) sensor is embedded into the material, allowing it to change length proportionally with the material's dimensions, enabling accurate measurement through RF energy transmission and round-trip time analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust sensor is placed within the host material to withstand harsh environments, then the sensor can survive hostile conditions, but the material integrity is compromised and physical properties are altered
Solution Approach 1:
The patent uses carbon nanotubes as an intermediary medium that can withstand harsh environments while minimally interacting with the host material. The nanotubes are embedded in the material and serve as sensors for dimensional changes without significantly altering the material's physical properties or compromising its integrity, thus mediating between the need for robust sensing and material preservation
Solution Approach 2:
The patent changes the physical parameters of the sensor by using carbon nanotubes with specific properties (high temperature resistance, small size) rather than conventional robust sensors. This parameter change allows the sensor to survive hostile environments while minimizing disruption to the host material's structure and properties
2Measurement precision
If a conventional sensor is used to measure dimensional changes, then measurements can be obtained, but the sensor is prone to disruption in harsh and dynamic conditions
Solution Approach 1:
The patent changes the sensor material parameters from conventional materials to carbon nanotubes, which have superior thermal stability and resistance to harsh environments. This allows the sensor to maintain measurement precision while surviving in conditions that would disrupt conventional sensors
Solution Approach 2:
The patent employs carbon nanotubes, which are composite structures with unique properties combining strength, thermal resistance, and dimensional stability. These composite material properties enable the sensor to maintain measurement accuracy in harsh environments where conventional sensors would fail
3Productivity
If a sensor is embedded into the host material to enable in-situ measurement, then continuous monitoring is achieved, but the material integrity is compromised and leakage or contamination may occur
Solution Approach 1:
The carbon nanotubes serve as an intermediary sensing element that can be embedded in the material without creating significant disruptions. Their small size and compatible properties allow them to function as continuous monitors while minimizing holes, weaknesses, or pathways for leakage and contamination in the host material
4Reliability
If robust equipment is used to withstand hostile environments, then the equipment can survive harsh conditions, but the equipment is complex and may alter material properties
Solution Approach 1:
The patent uses carbon nanotubes that, while individually small and simple, provide robust sensing capability without requiring complex protective housings or robust equipment. The nanotubes themselves are the sensing element, eliminating the need for complex sensor assemblies and reducing overall device complexity while maintaining reliability in harsh environments
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 solution provides accurate, real-time dimensional measurements in harsh environments without compromising the material's integrity or altering its properties, suitable for high-temperature and erosive conditions, and allows for in-situ monitoring without environmental perturbation.
Implementation Method 1
The controller may be configured to control transmission of transmit radio frequency energy through the carbon nanotube bundle to determine a round trip time between transmission and reception of the radio frequency energy
Implementation Method 2
determine a round trip time between transmission and reception of the radio frequency energy at a proximal end of the carbon nanotube bundle responsive to reflection of the radio frequency energy at a distal end of the carbon nanotube bundle
Data Source
AI summary
A sensor assembly includes a carbon nanotube bundle and a controller. The carbon nanotube bundle is integrated into a host material and extends along a predetermined dimension of the host material. The controller is configured to control transmission of radio frequency energy through the carbon nanotube bundle to determine a round trip time between transmission and reception of the radio frequency energy at a proximal end of the carbon nanotube bundle responsive to reflection of the radio frequency energy at a distal end of the carbon nanotube bundle.