Magnetostrictive Beam Sensor for Air-Water-Sediment Interface Detection
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Solution Overview
Problem
Existing sensors face difficulties in detecting air, water, and sediment interfaces, especially in low-flow or moving water conditions, necessitating the development of active-mode sensors that can provide accurate information regardless of flow conditions or water movement.
Innovation Solution
The implementation of active-mode sensors featuring a magnetostrictive beam with a clamp, a permanent magnet, and pickup and driver coils, which generate and measure magnetic field responses to differentiate between air, water, and sediment environments, utilizing Galfenol alloys for robustness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive-mode sensors are used to detect air-water-sediment interfaces, then the sensor structure can be simple, but the sensor fails to provide accurate information in low-flow or moving water conditions
Solution Approach 1:
The patent transitions from passive-mode to active-mode sensing, where the magnetostrictive beam is dynamically excited by a driver coil to vibrate at its resonant frequency. This dynamic excitation allows the sensor to actively probe the environment and detect changes in resonant frequency caused by different media (air, water, sediment), providing accurate measurements regardless of flow conditions
Solution Approach 2:
The patent utilizes mechanical vibration of the magnetostrictive beam as the sensing mechanism. The driver coil generates a magnetic field that induces vibrations in the magnetostrictive beam, and the resonant frequency of these vibrations changes based on the surrounding media. This vibration-based approach enables reliable detection in moving water conditions where passive sensors fail
2Use of energy by moving object
If passive-mode sensors are used, then energy consumption is low, but the sensor cannot detect interfaces in moving or shifting water and sediment
Solution Approach 1:
The patent employs dynamic excitation of the magnetostrictive beam through electromagnetic interaction between the driver coil and the magnetostrictive material. This active dynamic approach allows the sensor to maintain reliable detection capability in moving water and shifting sediment by continuously probing the environment, rather than relying on passive environmental forces
Solution Approach 2:
The patent replaces passive mechanical sensing with active electromagnetic-mechanical coupling. The driver coil generates a magnetic field that interacts with the magnetostrictive beam to produce controlled vibrations, and the pickup coil detects the magnetic field changes resulting from these vibrations. This substitution of passive mechanical detection with active electromagnetic excitation enables reliable operation in dynamic 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
These sensors effectively detect and distinguish between air, water, and sediment interfaces, providing real-time information on tank contents and levels, even in dynamic conditions, enhancing safety and operational efficiency in naval and environmental applications.
Implementation Method 1
FeGa-based alloys (Fe1−xGax, 'Galfenol') belong to a branch of magnetic materials called 'magnetostrictive' materials, which change their dimensions in response to changes in magnetization
Implementation Method 2
Magnetostrictive materials also experience an inverse effect, called the Villari effect, where magnetization and permeability changes occur in response to changes in applied stress/strain
Implementation Method 3
The driver coil generates a known magnetic field, and the pickup coil measures the magnetic field response of the first portion of the magnetostrictive beam to the known magnetic field
Data Source
AI summary
Active-mode sensors are provided, and may be used to detect air, water, and sediment interfaces. Systems and methods for sensing air, water, and sediment are also provided. The sensors are robust and withstand forces due to moving or shifting water and sediment.