Multiphysics modeling of printed surface acoustic wave thermometers

Draper, Alejandro; McKibben, Nicholas; Estrada, David; Deng, Zhangxian

doi:10.1016/j.sna.2023.114491

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…COMSOL Multiphysics is a robust simulation software package [ 23 ] that plays a vital role in the analysis and optimization of various facets of the 3D printing process. It can simulate the thermal distribution during 3D printing, providing essential insights into how materials melt and solidify [ 24 ], ensuring that the temperature curve is suitable for specific 3D printing technologies and materials.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Starch Gel Printing and Deformation Process Using COMSOL

Qin,

Li,

Zou

et al. 2024

Foods

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The food industry holds immense promise for 3D printing technology. Current research focuses mainly on optimizing food material composition, molding characteristics, and printing parameters. However, there is a notable lack of comprehensive studies on the shape changes of food products, especially in modeling and simulating deformations. This study addresses this gap by conducting a detailed simulation of the starch gel printing and deformation process using COMSOL Multiphysics 6.2 software. Additive manufacturing (AM) technology is widely acclaimed for its user-friendly operation and cost-effectiveness. The 3D printing process may lead to changes in part dimensions and mechanical properties, attributable to the accumulation of residual stresses. Studies require a significant amount of time and effort to discover the optimal composition of the printed material and the most effective deformed 3D structure. There is a risk of failure, which can lead to wasted resources and research delays. To tackle this issue, this study thoroughly analyzes the physical properties of the gel material through COMSOL Multiphysics 6.2 software, It simulates the heat distribution during the 3D printing process, providing important insights into how materials melt and solidify. Three-part models with varying aspect ratios were meticulously designed to explore shape changes during both the printing process and exposure to an 80 °C environment, employing NMR and rheological characterization. Using the generalized Maxwell model for material simulation in COMSOL Multiphysics, the study predicted stress and deformation of the parts by analyzing solid heat transfer and solid mechanics physical fields. Simulation results showed that among three models utilizing a gel-PET plastic membrane bilayer structure, Model No. 1, with the largest aspect ratio, exhibited the most favorable deformation under an 80 °C baking environment. It displayed uniform bending in the transverse direction without significant excess warpage in the edge direction. In contrast, Models No. 2 and No. 3 showed varying degrees of excess warpage at the edges, with Model No. 3 exhibiting a more pronounced warpage. These findings closely aligned with the actual printing outcomes.

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Section: Introductionmentioning

confidence: 99%

Simulation of Starch Gel Printing and Deformation Process Using COMSOL

Qin,

Li,

Zou

et al. 2024

Foods

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“…Pan et al [12], demonstrated that the temperature and humidity were the most critical elements affecting the behaviour of SAW sensor for sensing 2-chloroethyl ethyl sulphide (CEES) which showed substantial frequency shifts with variation in temperature and humidity. Draper et al [13], created a set of temperature-dependent finite element models for a SAW transducer composed of printed silver IDTs placed on a Lithium Niobate substrate. The frequency domain simulation effectively anticipated the temperature-induced natural frequency shift in the SAW thermometer.…”

Section: Introductionmentioning

confidence: 99%

Design optimization of surface acoustic wave devices and investigation of fabricated devices under temperature, humidity and steam environments

Anbalagan,

Lakshminarayanan,

Girija

2024

Phys. Scr.

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Surface Acoustic Wave (SAW) technique is one of the most promising Micro Electro Mechanical Systems (MEMS) based detection methods for a variety of applications. SAW sensor is based on the modulation of Rayleigh waves that travel near the surface of a piezoelectric substrate. Advent of MEMS technology has led to the development of SAW sensors which are widely used in chemical sensing, medical, industrial, telecommunication and biological applications. The main focus of this paper is to devise and characterize a generic SAW structure and study the acoustic properties at various environmental conditions before depositing the sensing layer/analyte for any particular application. In this work, a SAW device was designed using COMSOL Multiphysics for a resonant frequency of 100 MHz with 40 µm wavelength on Lithium Niobate (LiNbO3) piezoelectric substrate. The optimized device structure was fabricated using thin film deposition and UV photolithography. The resonant frequency of the fabricated device (97.63 MHz) matched closely with the simulation results (100 MHz) and theoretical results (100 MHz). The device was subjected to various environmental conditions to study the influence on the resonant frequency. The SAW structure showed a resonant frequency shift of 90 KHz in steam environment, ~ 1MHz when heated to 150°C and ~120 KHz when exposed to 80% RH. The device exhibited a linear shift in resonant frequency under all tested environmental conditions with a consistent baseline and good repeatability.

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