scholarly journals High-Resolution Thermal Imaging and Analysis of TIG Weld Pool Phase Transitions

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6952
Author(s):  
Nicholas Boone ◽  
Matthew Davies ◽  
Jon Raffe Willmott ◽  
Hector Marin-Reyes ◽  
Richard French
Keyword(s):  
Phase Transitions ◽  
High Resolution ◽  
Weld Pool ◽  
Thermal Imaging ◽  
Near Infrared ◽  
Imaging System ◽  
Travel Speed ◽  
Tig Welding ◽  
Infrared Radiance ◽  
Wide Range

Tungsten inert gas (TIG) welding is a well-established joining process and offers the user flexibility to weld a large range of materials. Ultra-thin turbine tipping is an important application for TIG welding that is exceptionally challenging due to the wide range of variables needed to accurately control the process: slope times, arc control, travel speed, etc. We offer new insight into weld pool characteristics, utilizing both on- and off-line measurements of weld tracks. High-resolution thermal imaging yields spatially and temporally resolved weld pool phase transitions coupled with post-weld photographs, which gives a novel perspective into the thermal history of a weld. Our imaging system is filtered to measure a 10 nm window at 950 nm and comprises a commercial Sigma lens to produce a near-infrared (NIR) camera. The measured near-infrared radiance is calibrated for temperature over the range of from 800 to 1350 °C.

scholarly journals Polarimetry and Physics of Be Star Envelopes (Review paper)

1982 ◽  
Vol 98 ◽  
pp. 77-93 ◽  
Author(s):  
George V. Coyne ◽  
Ian S. McLean
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Theoretical Models ◽  
Geometrical Parameters ◽  
Be Stars ◽  
Intermediate Band ◽  
Wide Range ◽  
Recent Developments ◽  
Be Star ◽  
Polarization Studies

A review of the most recent developments in polarization studies of Be stars is presented. New polarization techniques for high-resolution spectropolarimetry and for near infrared polarimetry are described and a wide range of new observations are discussed. These include broadband, intermediate-band and multichannel observations of the continuum polarization of Be stars in the wavelenght interval 0.3–2.2 microns, high resolution (0.5 Å) line profile polarimetry of a few stars and surveys of many stars for the purposes of statistical analyses. The physical significance of the observational material is discussed in the light of recent theoretical models. Emphasis is placed on the physical and geometrical parameters of Be star envelopes which polarimetry helps to determine.

High Resolution Thermal Imaging of Integrated Circuits

2007 ◽  
Vol 1022 ◽  
Author(s):  
Gilles Tessier ◽  
Mathieu Bardoux ◽  
Céline Filloy ◽  
Danièle Fournier
Keyword(s):  
High Resolution ◽  
Integrated Circuits ◽  
Spatial Resolution ◽  
Thermal Imaging ◽  
Optical Method ◽  
Near Infrared ◽  
Silicon Substrates ◽  
Active Layers ◽  
Ultraviolet Range ◽  
Interesting Solution

AbstractThermoreflectance is an non contact optical method using the local reflectivity variations induced by heating to infer temperature mappings, and can be conducted at virtually any wavelength. In the visible, the technique is now well established. It can probe temperatures through several micrometers of transparent encapsulation layers, with sub-micron spatial resolution and 100 mK thermal resolution. In the ultraviolet range, dielectric encapsulation layers are opaque and thermoreflectance gives access to the surface temperature. In the near infrared, thermoreflectance is an interesting solution to examine chips turned upside down, since these wavelengths can penetrate through silicon substrates and give access to the temperature of the active layers themselves. Here, we explore the possibilities of each wavelength range and detail the CCD-based thermal imaging tools dedicated to the high resolution inspection of integrated circuits.

Abstract 14935: Targeted Optical Molecular Imaging of Atheroma Calcification Using Novel Aldendronate-based Probe

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Dong Oh Kang ◽  
Yong Geun Lim ◽  
Joon Woo Song ◽  
Ye Hee Park ◽  
Hyun Jung Kim ◽  
...  
Keyword(s):  
Molecular Imaging ◽  
High Resolution ◽  
Murine Model ◽  
Calcium Binding ◽  
Laser Scanning ◽  
Near Infrared ◽  
Imaging System ◽  
Whole Body ◽  
Imaging Results

Background/Objectives: Vascular spotty calcification is an actively regulated biological process resulting in plaque vulnerability. We investigated the feasibility of a novel alendronate-based near-infrared fluorescence (NIRF)-emitting probe to specifically target atherosclerotic calcification in a murine model in vivo using our customized high-resolution multichannel intravital molecular imaging system (IVFM). Methods/Results: We have fabricated a calcium-binding NIRF probe by chemically coupling alendronate, a specific targeting ligand, and NIRF-emitting Cy5.5 to the ends of azide-PEG-NHS ester (Al-Cy5.5). Prepared Al-Cy5.5 has high affinity for calcium phosphate-containing bone minerals. In vitro, Al-Cy5.5 specifically binds to RANKL-induced osteogenic-macrophages as compared to macrophages (p<0.01). On whole body fluorescence imaging to assess time-dependent excretion, NIRF signals remained visible up to 48 hrs. Then, in mice with calcified plaque induced by a combination diet of high-cholesterol and warfarin, Al-Cy5.5 (2.5 mg/kg) was intravenously injected. 48 hrs after administration, murine calcified atheroma was assessed using a customized high-resolution multichannel IVFM, which demonstrated highly enhanced NIRF signals in vivo in the calcified areas of murine carotid plaques (p<0.01, Figure). Ex vivo laser scanning fluorescence microscopic and immune-histological findings from the corresponding sister sections well corroborated the in vivo imaging results, which demonstrated the co-localization of NIRF signals with plaque calcifications (von-Kossa stain). Conclusions: Our novel calcification targeted probe, Al-Cy5.5, was able to selectively target atheroma calcification in vivo in a murine model as assessed by optical IVFM. This novel targetable strategy is expected to provide a promising theranostic basis for calcified high-risk plaques by integration with multimodal customized catheter imaging system.

TADIR-production version: El-Op's high-resolution 480x4 TDI thermal imaging system

1999 ◽  
Author(s):  
Gabby Sarusi ◽  
Natan Ziv ◽  
O. Zioni ◽  
J. Gaber ◽  
Mark S. Shechterman ◽  
...  
Keyword(s):  
High Resolution ◽  
Thermal Imaging ◽  
Imaging System ◽  
Thermal Imaging System

scholarly journals Revealing Hidden Features in Multilayered Artworks by Means of an Epi-Illumination Photoacoustic Imaging System

2021 ◽  
Vol 7 (9) ◽  
pp. 183
Author(s):  
George J. Tserevelakis ◽  
Antonina Chaban ◽  
Evgenia Klironomou ◽  
Kristalia Melessanaki ◽  
Jana Striova ◽  
...  
Keyword(s):  
Near Infrared ◽  
Imaging System ◽  
Photoacoustic Imaging ◽  
Structural Features ◽  
Thickness Measurement ◽  
Imaging Method ◽  
Nir Imaging ◽  
Wide Range ◽  
Detection Of Signals ◽  
Cultural Heritage Objects

Photoacoustic imaging is a novel, rapidly expanding technique, which has recently found several applications in artwork diagnostics, including the uncovering of hidden layers in paintings and multilayered documents, as well as the thickness measurement of optically turbid paint layers with high accuracy. However, thus far, all the presented photoacoustic-based imaging technologies dedicated to such measurements have been strictly limited to thin objects due to the detection of signals in transmission geometry. Unavoidably, this issue restricts seriously the applicability of the imaging method, hindering investigations over a wide range of cultural heritage objects with diverse geometrical and structural features. Here, we present an epi-illumination photoacoustic apparatus for diagnosis in heritage science, which integrates laser excitation and respective signal detection on one side, aiming to provide universal information in objects of arbitrary thickness and shape. To evaluate the capabilities of the developed system, we imaged thickly painted mock-ups, in an attempt to reveal hidden graphite layers covered by various optically turbid paints, and compared the measurements with standard near-infrared (NIR) imaging. The obtained results prove that photoacoustic signals reveal underlying sketches with up to 8 times improved contrast, thus paving the way for more relevant applications in the field.

scholarly journals Remote sensing of exoplanetary atmospheres with ground-based high-resolution near-infrared spectroscopy

2019 ◽  
Vol 629 ◽  
pp. A109 ◽  
Author(s):  
D. Shulyak ◽  
M. Rengel ◽  
A. Reiners ◽  
U. Seemann ◽  
F. Yan
Keyword(s):  
Infrared Spectroscopy ◽  
Temperature Distribution ◽  
High Resolution ◽  
Near Infrared Spectroscopy ◽  
Atmospheric Chemistry ◽  
Near Infrared ◽  
Optimal Estimation ◽  
High Resolution Spectroscopy ◽  
High Signal ◽  
Wide Range

Context. Thanks to the advances in modern instrumentation we have learned about many exoplanets that span a wide range of masses and composition. Studying their atmospheres provides insight into planetary origin, evolution, dynamics, and habitability. Present and future observing facilities will address these important topics in great detail by using more precise observations, high-resolution spectroscopy, and improved analysis methods. Aims. We investigate the feasibility of retrieving the vertical temperature distribution and molecular number densities from expected exoplanet spectra in the near-infrared. We use the test case of the CRIRES+ instrument at the Very Large Telescope which will operate in the near-infrared between 1 and 5 μm and resolving powers of R = 100 000 and R = 50 000. We also determine the optimal wavelength coverage and observational strategies for increasing accuracy in the retrievals. Methods. We used the optimal estimation approach to retrieve the atmospheric parameters from the simulated emission observations of the hot Jupiter HD 189733b. The radiative transfer forward model is calculated using a public version of the τ-REx software package. Results. Our simulations show that we can retrieve accurate temperature distribution in a very wide range of atmospheric pressures between 1 bar and 10−6 bar depending on the chosen spectral region. Retrieving molecular mixing ratios is very challenging, but a simultaneous observations in two separate infrared regions around 1.6 and 2.3 μm helps to obtain accurate estimates; the exoplanetary spectra must be of relatively high signal-to-noise ratio S∕N ≥ 10, while the temperature can already be derived accurately with the lowest value that we considered in this study (S∕N = 5). Conclusions. The results of our study suggest that high-resolution near-infrared spectroscopy is a powerful tool for studying exoplanet atmospheres because numerous lines of different molecules can be analyzed simultaneously. Instruments similar to CRIRES+ will provide data for detailed retrieval and will provide new important constraints on the atmospheric chemistry and physics.

scholarly journals Portable robot for autonomous venipuncture using 3D near infrared image guidance

TECHNOLOGY ◽  
2013 ◽  
Vol 01 (01) ◽  
pp. 72-87 ◽  
Author(s):  
Alvin Chen ◽  
Kevin Nikitczuk ◽  
Jason Nikitczuk ◽  
Tim Maguire ◽  
Martin Yarmush
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Imaging System ◽  
Infrared Image ◽  
Training Model ◽  
Medical Injury ◽  
Wide Range ◽  
Spatial Coordinates ◽  
Imaging Performance ◽  
Rate Of Success

Venipuncture is pivotal to a wide range of clinical interventions and is consequently the leading cause of medical injury in the U.S. Complications associated with venipuncture are exacerbated in difficult settings, where the rate of success depends heavily on the patient's physiology and the practitioner's experience. In this paper, we describe a device that improves the accuracy and safety of the procedure by autonomously establishing a peripheral line for blood draws and IV's. The device combines a near-infrared imaging system, computer vision software, and a robotically driven needle within a portable shell. The device operates by imaging and mapping in real-time the 3D spatial coordinates of subcutaneous veins in order to direct the needle into a designated vein. We demonstrate proof of concept by assessing imaging performance in humans and cannulation accuracy on an advanced phlebotomy training model.

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