1. RFID Compatible Wireless Magnetoelastic Sensors for
Liquid Spectroscopy and Food Safety Inspection
Harikrishnan Arangali, Dr. Premjeet Chahal
Michigan State University-Terahertz Systems Laboratory
Contact Information:
Harikrishnan Arangali harikrishnanas507@gmail.com | Dr. Prem Chahal chahal@egr.msu.edu
Results
Conclusion
Abstract
• A hybrid sensor is made by using two magnetoelastic strips cantilevered
onto a circuit board.
• The strips additionally also acts as a parallel plate capacitor. The
capacitor is connected to an inductor coil and this setup is immersed in
the solution of interest.
• The resonance frequency of this setup ; both acoustic and electric, is
obtained remotely using an interrogation coil connected to an
impedance analyzer.
The impedance and phase plots obtained experimentally, for aqueous
glycerin solutions of different concentrations , using the hybrid sensor is
shown :
• Experimental results obtained are in accordance with theoretical
formulae. Proof of concept achieved.
• This sensor can be adapted to check for milk spoilage as spoilt milk has
different viscoelastic and electrical properties from fresh milk.
• An array of these sensors can be made ; each coated with different
chemicals, to check for different pathogens and toxic substances making
it a very versatile wireless environment sensor
1. Grimes, C. A., Mungle, C. S., Zeng, K., Jain, M. K., Dreschel, W. R., Paulose, M., & Ong, K. G.
(2002). Wireless magnetoelastic resonance sensors: A critical review. Sensors, 2(7),
294–313.
2. Lakshmanan, R. S., Guntupalli, R., Hu, J., Petrenko, V. A., Barbaree, J. M., & Chin, B. A. (2007).
Detection of Salmonella typhimurium in fat free milk using a phage immobilized
magnetoelastic sensor. Sensors and Actuators B: Chemical, 126(2), 544–550
3. An acoustic dielectric and mechanical spectrometer - Analyst (RSC Publishing)
DOI:10.1039/C2AN35202H. (n.d.). Retrieved July 5, 2015, from
http://pubs.rsc.org/en/content/articlehtml/2012/an/c2an35202h
4. Zeng, K., & Grimes, C. A. (2007). Wireless magnetoelastic physical, chemical, and biological
sensors. Magnetics, IEEE Transactions on, 43(6), 2358–2363
The theoretical shift in resonance frequency of a thin strip on viscous
loading is given by :
𝛿𝑓 ≈ −
𝜋𝑓𝜂𝜌 𝑙
2𝜋𝜌 𝑠 𝑑
, where 𝜂 = 𝑣𝑖𝑠𝑐𝑜𝑠𝑖𝑡𝑦 𝑜𝑓 𝑙𝑖𝑞𝑢𝑖𝑑; 𝜌𝑙 = 𝑑𝑒𝑛𝑠𝑖𝑡𝑦 𝑜𝑓 𝑙𝑖𝑞𝑢𝑖𝑑
The theoretical shift in resonance frequency of an L-C circuit on loading the
capacitor is given by :
𝛿𝑓 ≈ −
𝑓 𝛿𝜖 𝑟
2
, where 𝛿𝜖 𝑟 = 𝑐ℎ𝑎𝑛𝑔𝑒 𝑖𝑛 𝑟𝑒𝑙𝑎𝑡𝑖𝑣𝑒 𝑝𝑒𝑟𝑚𝑖𝑡𝑡𝑖𝑣𝑖𝑡𝑦 𝑏𝑒𝑡𝑤𝑒𝑒𝑛
𝑡ℎ𝑒 𝑝𝑎𝑟𝑎𝑙𝑙𝑒𝑙 𝑝𝑙𝑎𝑡𝑒𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑐𝑎𝑝𝑎𝑐𝑖𝑡𝑜𝑟
Objectives
Procedure
Figure 1 : Sensor schematic Figure 2 : Experimental setup
• Mr. Greg Mulder and Mr. Brian Wright of the ECE shop at MSU who
facilitated the fabrication.
• DECS 3-D Printing facility at MSU.
• Dr. Katy Colbry, Mary Anne Walker and others who facilitated the inGEAR
program.
• Dr. Lalita Udpa and the NDE lab for lending necessary equipment.
• Metglas Inc. for providing free samples of magnetoelastic material.
Magnetoelastic sensors have attracted considerable interest within the
sensor community due to its resilience, and sensitivity to different
environmental parameters. Magnetoelastic sensors are made of
amorphous metallic glass ribbons cut to appropriate geometry with a
characteristic resonant frequency, which is dependant on that geometry.
This frequency shifts in response to different physical parameters like
stress, pressure, mass loading, liquid viscosity, etc. Sensors that can
characterize a liquid based on its viscoelastic properties using this concept
have been made in the past.
A hybrid sensor, that vibrates acoustically and resonates electrically would
provide significant insight to the relationship between mechanical and
electrical properties of samples. Additionally, a hybrid sensor which
behaves as a dielectric and mechanical spectrometer, monitoring the
electrical and mechanical properties of viscoelastic materials
simultaneously, has prospective application in studies of biomaterials,
molecular interactions and drug deliveries. From the commercial point of
view, these sensors could be used for quality inspection of drinking water,
milk and other liquid food products.
Project Overview
References
• To fabricate a magnetoelastic sensor that can characterize the
viscoelastic properties as well as electrical properties of different liquid
samples.
• To obtain data for aqueous glycerin solutions of varying concentrations
and to co-relate them with their already known physical properties.
• To design a modified model of the sensor incorporating the working
principle of RFID for commercial food testing based applications.
Working Principle
84
84.5
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85.5
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86.5
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87.5
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100 110 120 130 140 150 160 170
Phase(indegrees)
Frequency (in kHz)
Acoustic Resonance Comparison
Air
100% water
12.5% Glycerin (by volume)
25% Glycerin(by volume)
50% Glycerin(by volume)
0
10
20
30
40
50
60
70
80
90
0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
Phase(indegrees)
Frequency (in MHz)
Electrical Resonance Comparison
Air
100%water
12.5% Glycerin (by volume)
25% Glycerin (by volume)
50% Glycerin (by volume)
Acknowledgements
Figure 3 : Experiment Schematic and Equivalent Sensor model