Eddy Current–Tunneling Magneto-Resistive Sensor for Micromotion Detection of a Tibial Orthopaedic Implant
| Autor: | Fernando Faria Franco, Susana Cardoso de Freitas, Michael Heimlich, Rajas Khokle, Karu P. Esselle, Desmond J. Bokor |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Eddy-current sensor Acoustics 010401 analytical chemistry 01 natural sciences 0104 chemical sciences law.invention Tunnel magnetoresistance Signal-to-noise ratio law Eddy current Heterodyne detection Sensitivity (control systems) Electrical and Electronic Engineering Resistor Instrumentation Magneto |
| Zdroj: | IEEE Sensors Journal. 19:1285-1292 |
| ISSN: | 2379-9153 1530-437X |
| Popis: | In this paper, an eddy current loop coupled with the tunneling magneto resistor (EC-TMR) is used as a displacement sensor to detect the micromotion of an orthopaedic implant. The high sensitivity and signal to noise ratio of the TMR sensor are used to achieve high resolution at a large standoff distance. First, a small three-turn rectangular eddy current loop of dimension $2.5\,\,\text {mm} \times 10$ mm is designed and simulated inside the human body using a full-wave EM simulator. Then, it is fabricated and tested using vector network analyzer. The magnetic tunnel junction stack is optimized and a six-element TMR sensor is fabricated and characterized. The eddy current and tunnelling magneto resistive sensor are integrated and heterodyne detection technique is used to obtain the high-resolution micromotion detection at an extended standoff range. This technique can be used for in-vivo detection of the micromotion of the orthopaedic implant which will be useful in reducing the revision surgeries due to the mechanical failures of the implant. |
| Databáze: | OpenAIRE |
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