Metamaterial Deformation Sensor for Torque Measurement
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Solution Overview
Problem
Existing torque sensors in vehicles are sensitive to magnetic disturbances, suffer from cross-sensitivity to environmental conditions, require power supply, and have limitations in scalability and reliability, especially in harsh automotive environments.
Innovation Solution
A sensor system featuring a flexible substrate with a metamaterial layer that undergoes deformation in response to forces or environmental conditions, using strain-dependent coupling to convert electromagnetic waves and provide accurate measurements, which is robust against electromagnetic interference and does not require a power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic angle sensors and linear Hall sensors are used to measure steering angle and steering torque, then measurement capability is provided, but sensitivity to magnetic disturbances increases
Solution Approach 1:
The patent replaces magnetic field-based sensing with optical field-based sensing. Instead of using magnetic angle sensors and Hall sensors that rely on magnetic fields, the invention uses optical sensors with waveplates and polarizing filters that operate on optical principles, thereby eliminating sensitivity to magnetic disturbances while maintaining measurement capability
Solution Approach 2:
The patent introduces an intermediary optical system between the measurement object and the sensor. The waveplates and polarizing filters act as intermediaries that convert mechanical deformation (torque/angle) into optical property changes (polarization rotation), which are then detected by optical sensors, providing magnetic-field-independent measurement
2Ease of manufacture
If strain gauges are used for torque measurement, then cost-effectiveness is achieved, but cross-sensitivity to environmental conditions increases
Solution Approach 1:
The patent replaces electrical resistance-based strain gauges with optical property-based sensing. Instead of measuring resistance changes in wires that are sensitive to temperature and pressure, the invention measures changes in optical properties (polarization, refractive index) of a transparent material, which are less sensitive to environmental conditions
Solution Approach 2:
The patent uses composite material structures including transparent materials with embedded waveplates and polarizing filters. This composite structure maintains cost-effectiveness while improving environmental stability by combining materials with complementary properties that resist environmental degradation
3Adaptability or versatility
If strain gauges with arbitrary thin wires are used, then scalability is improved, but overheating risk increases
Solution Approach 1:
The patent replaces electrical current-carrying wires with optical waveguides or light-transmitting paths. Optical signals can be transmitted through arbitrarily thin transparent structures without resistive heating, enabling scalability to very thin dimensions while avoiding overheating risks inherent in electrical wire-based strain gauges
4Device complexity
If indirect measurement with strain gauges on stationary parts is used, then power supply complexity is reduced, but cross-sensitivity to non-torque deformations increases
Solution Approach 1:
The patent replaces indirect electrical measurement with direct optical measurement on rotating parts. Optical sensors can be positioned to measure torque directly at the point of application without requiring power transfer to rotating components, eliminating both power supply complexity and cross-sensitivity issues simultaneously
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 sensor system provides accurate and reliable measurements of torque and strain, is scalable, and resistant to electromagnetic interference, offering a cost-effective solution for various applications.
Implementation Method 1
the first metamaterial layer comprises a first array of conductive elements that are mutually coupled by a first strain-dependent coupling that changes based on the deformation of the first flexible substrate
Implementation Method 2
the first metamaterial layer is configured to convert the first electromagnetic transmit wave into a first electromagnetic receive wave based on the first strain-dependent coupling
Implementation Method 3
a first flexible substrate configured to undergo a deformation in response to at least one force applied to the first flexible substrate or an environmental condition to which the first flexible substrate is exposed
Data Source
AI summary
A sensor system includes a first flexible substrate configured to undergo a deformation in response to a force applied to the first flexible substrate or an environmental condition to which the first flexible substrate is exposed; a first metamaterial layer mechanically coupled to the first flexible substrate, wherein the first metamaterial layer comprises a first array of conductive elements that are mutually coupled by a first strain-dependent coupling that changes based on the deformation of the first flexible substrate; at least one transmitter configured to transmit a first electromagnetic transmit wave towards the first metamaterial layer, wherein the first metamaterial layer is configured to convert the first electromagnetic transmit wave into a first electromagnetic receive wave based on the first strain-dependent coupling; and at least one receiver configured to receive the first electromagnetic receive wave and acquire a first measurement of a first property of the first electromagnetic receive wave.