Results 161 to 170 of about 5,430 (219)

Design and construction of a low-cost, low-input Open Top Chamber field warming setup to assess aboveground plant response to global warming. [PDF]

Front Plant Sci
Hauser J, Kooijman PC, Paddon END, Verhoeven A, Kalisvaart J, Meesters AN, Snoek BL, van Zanten M.   +7 more
europepmc   +1 more source

Novel Spatio-Temporal Joint Learning-Based Intelligent Hollowing Detection in Dams for Low-Data Infrared Images. [PDF]

Sensors (Basel)
Zhang L, Jin Z, Wang Y, Wang Z, Duan Z, Qi T, Shi R.   +6 more
europepmc   +1 more source

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Multiplexed lock-in thermography

Review of Scientific Instruments, 2021
Many modern measurement methods for heat transfer work in the frequency domain. A certain average temperature rise in the sample is unavoidable if the sample can only be heated, e.g., by an intensity modulated light source. This average temperature rise influences the measured thermal properties because they are, in general, temperature dependent. Here,
Bernd A. F. Kopera, Markus Retsch
openaire   +2 more sources

Defect detectability based on square wave lock-in thermography

Applied Optics, 2022
A lock-in thermography technique based on a periodical square wave is used to detect stainless steel plates with defects. Combining a neural network with lock-in thermography, an image processing technique is proposed, and the results are compared with traditional image processing methods.
Pengfei, Zhu, Dan, Wu, Yifan, Wang, Zhifei, Miao   +3 more
openaire   +2 more sources

Defect Localization by Lock-In-Thermography

International Symposium for Testing and Failure Analysis, 2022
Abstract This presentation provides an overview of lock-in thermography and its application in semiconductor failure analysis. It begins with a review of direct thermal imaging, IR transmission and detection, and the fundamentals of lock-in measurements.
openaire   +1 more source

3D Hot-Spot Localization by Lock-In Thermography

EDFA Technical Articles, 2019
Abstract This article describes a form of lock-in thermography that achieves 3D localization of thermally active defects in stacked die packages. In this approach, phase shifts associated with thermal propagation delay are analyzed as a function of frequency.
Sebastian Brand, Frank Altmann
openaire   +1 more source

Infrared lock-in thermography through glass substrates

Solar Energy Materials and Solar Cells, 2011
Abstract Infrared lock-in thermography of an active layer through a glass substrates is demonstrated and explained theoretically. A transition between signal generation close to the active layer and close to the back surface of the substrate is found for glass at 0.5 Hz.
H. Straube, O. Breitenstein
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Defect depth quantification using lock-in thermography

Quantitative InfraRed Thermography Journal, 2015
In this paper we explore the defect evaluation in austenitic stainless steel (SS) using Lock-in technique and the effect of modulation frequency on defect detectability. A review of international literature indicates that while such studies have been attempted on materials like Perspex and composites, studies on austenitic SS like AISI 316, which are ...
Sharath Delanthabettu, Murugesan Menaka, Balasubramanian Venkatraman, Baldev Raj   +3 more
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Absorption measurements in optical coatings by lock-in thermography

Applied Optics, 2017
We evaluate and apply lock-in thermography as a method to quantitatively evaluate absorption losses of optical coatings. The principle of the method consists of applying periodically modulated laser intensity on the coatings and to monitor the periodic surface temperature evolution with an infrared camera.
Liu, Feng, Gallais, Laurent
openaire   +3 more sources