Results 31 to 40 of about 670 (184)

A Review of Microwave Thermography Nondestructive Testing and Evaluation

Sensors, 2017
Microwave thermography (MWT) has many advantages including strong penetrability, selective heating, volumetric heating, significant energy savings, uniform heating, and good thermal efficiency.
Hong Zhang, Ruizhen Yang, Yunze He, Ali Foudazi, Liang Cheng, Guiyun Tian   +5 more
doaj   +1 more source

Simultaneous direct measurements of conventional and inverse magnetocaloric effects in Ni–Mn-based Heusler alloys using lock-in thermography technique

AIP Advances, 2020
The second-order conventional and first-order inverse magnetocaloric effects (MCEs) in Ni–Mn-based quaternary Heusler alloys have been systematically investigated by means of the lock-in thermography technique, which enables the direct measurement of the
Rajkumar Modak, Ryo Iguchi, Hossein Sepehri-Amin, Asuka Miura, Ken-ichi Uchida   +4 more
doaj   +1 more source

Design and Construction of an LED-Based Excitation Source for Lock-In Thermography

Applied Sciences, 2022
Active thermography is an established technique for non-destructive testing and defect localisation. For external excitation, powerful light sources are commonly used.
Patrick Dahlberg, Nils J. Ziegeler, Peter W. Nolte, Stefan Schweizer   +3 more
doaj   +1 more source

Programmable Soft Actuator with Multi‐Responsiveness Based on Conductive MOF‐Liquid Crystal Polymer Composite

Advanced Functional Materials, EarlyView.
A sequential dual‐alignment strategy independently programs the orientation of conductive metal‐organic framework (c‐MOF) microrods and liquid crystals within a composite film. This approach creates an asymmetric bilayer structure that enables precise, multi‐responsive actuation.
Taegyun Hong, Geunho Kim, Changjae Lee, Sarang Lee, Jesse G. Park, Dong Ki Yoon   +5 more
wiley   +1 more source

Cooperative Goniopolar and Anomalous Nernst Transverse Thermoelectricity in Kagome Magnets

Advanced Materials, EarlyView.
A cooperative transverse thermoelectric mechanism is realized in kagome magnets, where axis‐dependent goniopolar effects and Berry curvature‐driven anomalous Nernst coexist within the same energy window. In MgMn6Sn6, this intrinsic synergy yields a record room‐temperature transverse thermopower of 15.6 µV K−1, establishing a general strategy for high ...
Honghui Wang, Xiaolong Feng, Haihua Hu, Xuemin Shi, Ralf Koban, Walter Schnelle, Wenzhi Peng, Dazhi Hou, Jianjun Ying, Bin He, Yu Pan, Xiaoyuan Zhou, Claudia Felser   +12 more
wiley   +1 more source

Detection of Particulate Matter With Lock‐In Thermography

CleanMat
ABSTRACT Ultrafine particles (UFPs), particularly black carbon (BC), are major contributors to air pollution, climate change, and health risks. Conventional quantification techniques such as Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Raman Spectroscopy, while effective, suffer from limitations in ...
Alina Oetsen, Christoph Geers, Andreas Traube, Gunter Festel, Daniel Fehr, Mathias Bonmarin   +5 more
openaire   +1 more source

Measurement of Thermal Diffusivity by Lock-in Thermography

Proceedings of the 2000 International Conference on Quantitative InfraRed Thermography, 2000
Diffusivity is generally measured on small sample under laboratory conditions where each side of the specimen is accessible, but one-side measurement may be necessary in such applications requiring in situ inspection. Experimental results are reported applying a thermoelectric unit in contact with the sample, acting alternatively as heat source and ...
P.G. Bison, S. Marinetti, E. Grinzato
openaire   +1 more source

Microscale Mapping of Fiber Strain and Damage in Composite Wrinkled Laminates Using Computed Tomography Assisted Wide‐Angle X‐Ray Scattering

Advanced Science, EarlyView.
This study combines full‐field tomography with diffraction mapping to quantify radial (ε002$\varepsilon _{002}$) and axial (ε100$\varepsilon _{100}$) lattice strain in wrinkled carbon‐fiber specimens for the first time. Radial microstrain gradients (−14.5 µεMPa$\varepsilon \mathrm{MPa}$−1) are found to signal damage‐prone zones ahead of failure, which ...
Hoang Minh Luong, James Trevarthen, Igor Dolbnya, Wadwan Singhapong, Nicholas Pilato, Richard Butler, Jiraphant Srisuriyachot, Alexander J. G. Lunt   +7 more
wiley   +1 more source

Mechanically Robust, Self‐Healable, and Cryotolerant GelMA Hydrogel for Wearable Tactile Sensors with Enhanced Durability, Lifetime, and Environmental Stability

Advanced Science, EarlyView.
A mechanically robust, self‐healable, moisturizing, cryotolerant and adhesive GelMA hydrogel is developed by incorporating polyvinyl alcohol, acrylic acid, sodium tetraborate, and glycerol into GelMA matrix via a photoinitiated polymerization process. The hydrogel‐derived omni‐healable ionotronic pressure sensor can sensitively and consistently monitor
Zhikang Li, Gengyu Han, Boqing Jia, Jijian Lu, Changxu Zhang, Bin Wang, Jiaxiang Wang, Kang Zhao, Muhammad Afzal Khan Qureshi, Lan Yu, Min Li, Guoxi Luo, Tong Wang, Qijing Lin, Weishi Li, Libo Zhao, Yumeng Xue   +16 more
wiley   +1 more source

Multipass lock-in thermography for the study of optical coating absorption

Applied Optics, 2022
The development of high-power lasers requires optics with very low absorption to avoid detrimental thermal effects. In this work, we discuss our recent developments on the use of lock-in thermography to measure absorption. We apply this technique in a multipass configuration to increase the effective power on the tested samples.
Petite, Camille, Marcouillé, Rémi, Moreau, Antonin, Krol, Hélène, Grèzes-Besset, Catherine, Lumeau, Julien, Gallais, Laurent   +6 more
openaire   +3 more sources