Magnetostrictive Wire Position Detection via Reflected Torsional Motion
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Solution Overview
Problem
Magnetostrictive sensors face challenges in accurately detecting linear displacement when the monitored object is close to the sensing end of the magnetostrictive wire, due to interference from 'ringing' signals that affect precise position detection.
Innovation Solution
The system employs a magnetostrictive wire with a reflective termination and a processor that applies an electrical excitation signal, detects torsional motion, and calculates the object's position based on reflected signals, thereby avoiding interference from 'ringing' signals by using only the reflected torsional motion or electrical pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetostrictive sensing is used to detect linear displacement, then the sensing mechanism is simple, but measurement precision deteriorates when the monitored object is close to the sensing end due to ringing signal interference
Solution Approach 1:
The patent extracts and isolates the useful reflected torsional motion signal from the harmful direct signal and ringing signals. By using a reflective termination to generate a reflected signal and selectively processing only the reflected portion, the system separates the desired measurement information from the interfering signals, thereby improving position detection accuracy near the sensing end
Solution Approach 2:
The reflective termination acts as an intermediary element that creates a reflected torsional motion signal. This intermediary signal serves as a clean reference that can be used to determine magnet position without being corrupted by the harmful ringing signals that directly affect conventional sensing methods
2Adaptability or versatility
If the monitored object is positioned close to the sensing end to expand measurement range, then adaptability improves, but measurement precision deteriorates due to difficulty in accurately detecting torsional motion
Solution Approach 1:
Instead of directly detecting the torsional motion at the sensing end (which becomes inaccurate when the magnet is close), the patent inverts the approach by detecting the reflected torsional motion that travels back from the reflective termination. This inverted sensing method allows accurate measurement even when the magnet is positioned near the sensing end, thereby expanding the usable measurement range without sacrificing precision
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 precise linear displacement detection even when the object is close to the sensing end, reducing inaccuracies caused by 'ringing' and improving the reliability of position calculation.
Implementation Method 1
the object to be measured may be provided with a magnet, which induces a torsional strain in the magnetostrictive wire when the wire is subject to an electrical signal
Implementation Method 2
The reflective termination is configured to reflect the torsional motion of the magnetostrictive wire
Data Source
AI summary
Magnetostrictive sensing systems and methods are disclosed. One such system comprises a magnetostrictive wire having first and second ends. A magnet is movable along a length of the magnetostrictive wire. An excitation device is operable to apply an electrical excitation signal to the magnetostrictive wire. A torsional motion sensor is operable to detect a torsional motion of the magnetostrictive wire. A reflective termination is configured to reflect the torsional motion of the magnetostrictive wire. A processor is in communication with the excitation device and the torsional motion sensor. The processor is programmed to (i) apply the electrical excitation signal to the magnetostrictive wire with the excitation device, (ii) identify whether the torsional motion detected by the torsional motion sensor has been reflected by the reflection termination, and (iii) calculate a position of the magnet along the magnetostrictive wire based on only the detected torsional motion reflected by the reflection termination.