Design and analysis of magnetostrictive sensors for wireless temperature sensing

Rajagopal, Manjunath C; Sinha, Sanjiv

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https://hdl.handle.net/2142/109188 Copy

Description

Title

Design and analysis of magnetostrictive sensors for wireless temperature sensing

Author(s)

• Rajagopal, Manjunath C
• Sinha, Sanjiv

Issue Date

2021-01

Keyword(s)

• wireless
• temperature
• sensing
• thermometry
• tags
• magnetoelastic
• magnetostrictive

Abstract

Magnetostrictive transducers are commonly used as actuators, sonar transducers, and in remote non-destructive evaluation. Their use in wireless thermometry is relatively unexplored. Since magnetostriction-based sensors are passive, they could potentially enable long-term near-field thermometry. While the temperature sensitivity of resonance frequency in magnetostrictive transducers has been reported in previous studies, the origin of the temperature sensitivity has however not been elucidated. Here, we identify material properties that determine temperature sensitivity, and identify ways to improve sensitivity as well as the detection technique. Using a combination of analytical and computational methods, we systematically identify the material properties that directly influence the temperature coefficient of resonance frequency (TCF). We first experimentally measure the shift in resonance frequency due to temperature changes in a Metglas strip to be 0.03%K-1. Using insights from theory, we then experimentally demonstrate a 5-fold improvement to the TCF by using Terfenol in place of Metglas as the magnetostrictive sensor material. We further demonstrate an alternate temperature sensing technique that does not require measuring the resonance frequency, consequently reducing instrument complexity. This work provides a general framework to analyze magnetostrictive materials and the sensing scheme for near-field wireless thermometry.

Publisher

American Institute of Physics

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/109188

DOI

10.1063/5.0035296

Sponsor(s)/Grant Number(s)

NSF-CBET-17-06854

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