Phase measurements of electromagnetic fields using infrared imaging techniques and microwave holography

1996 ◽  
Author(s):  
John E. Will ◽  
John D. Norgard ◽  
Carl Stubenrauch ◽  
Katie MacReynolds ◽  
Michael F. Seifert ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Phase Measurements

scholarly journals Close-Range Photogrammetry and Infrared Imaging for Non-Invasive Honeybee Hive Population Assessment

2018 ◽  
Vol 7 (9) ◽  
pp. 350 ◽  
Author(s):  
Luis López-Fernández ◽  
Susana Lagüela ◽  
Pablo Rodríguez-Gonzálvez ◽  
José Martín-Jiménez ◽  
Diego González-Aguilera
Keyword(s):  
Computer Vision ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Population Level ◽  
Non Invasive ◽  
Close Range Photogrammetry ◽  
3D Geometry ◽  
Thermographic Imaging ◽  
Close Range ◽  
Bee Colonies

Close-range photogrammetry and thermographic imaging techniques are used for the acquisition of all the data needed for the non-invasive assessment of a honeybee hive population. Temperature values complemented with precise 3D geometry generated using novel close-range photogrammetric and computer vision algorithms are used for the computation of the inner beehive temperature at each point of its surface. The methodology was validated through its application to three reference beehives with different population levels. The temperatures reached by the exterior surfaces of the hives showed a direct correlation with the population level. In addition, the knowledge of the 3D reality of the hives and the position of each temperature value allowed the positioning of the bee colonies without the need to open the hives. This way, the state of honeybee hives regarding the growth of population can be estimated without disturbing its natural development.

Latest developments in the EMIR technique of infrared imaging electromagnetic fields

2001 ◽  
Author(s):  
Patrick Levesque ◽  
L. Leylekian ◽  
Alain A. Deom ◽  
Daniel L. Balageas
Keyword(s):  
Electromagnetic Fields ◽  
Infrared Imaging

Absolute Magnetometry Using Electron Holography: Magnetic Superlattices and Small Particles

MRS Bulletin ◽  
1995 ◽  
Vol 20 (10) ◽  
pp. 45-48 ◽  
Author(s):  
Marian Mankos ◽  
J.M. Cowley ◽  
M.R. Scheinfein
Keyword(s):  
Electromagnetic Fields ◽  
Spatial Resolution ◽  
Giant Magnetoresistance ◽  
High Spatial Resolution ◽  
Imaging Techniques ◽  
Absolute Calibration ◽  
Magnetization Distribution ◽  
Electron Holography ◽  
Near Surface ◽  
Magnetic Microstructure

Synthesized magnetic structures are of interest due to their unique and unusual properties, which are governed by their micromagnetic structure. For example, giant-magnetoresistance (GMR) multilayer structures composed of magnetic layers separated by nonmagnetic spacers, and granular GMR films composed of magnetic and nonmagnetic metals exhibit phenomena whose interpretation requires knowledge of both the physical and micromagnetic structure at nanometer-length scales. Techniques for magnetic-microstructure imaging are based on the interaction between a probe and either the magnetic microstructure itself (magnetization) or a physical quantity related to the magnetization distribution (e.g., magnetostriction, magnetic induction). Transmission methods are sensitive to bulk magnetic microstructure averaged along the direction of the incident probe; surface structure is lost. Reflection techniques interact with the near-surface region and no information is obtained about the bulk structure aside from those properties that can be inferred from appropriate boundary conditions.Electron-optical methods represent the widest class of high-spatial-resolution, magnetic-domain imaging techniques. The most advanced techniques provide the highest contrast, sensitivity, and point resolution (1 nm). Electron holography offers quantitative micromagnetic information at high spatial resolution, a feature missing in most magnetic-imaging techniques. Quantitative information can be extracted from the absolutely calibrated electron wavelength and a knowledge of electron phase shifts in electromagnetic fields. High sensitivity, nanometer spatial resolution, and absolute calibration make electron holography a powerful tool for examining magnetic microstructure. In electron holography, both the amplitude and phase of the transmitted electron waves can be recovered in contrast to conventional electron microscopy where only the intensity is available. The phase, containing information about the local distribution of electromagnetic fields, can be retrieved from an electron hologram.

Novel Electro-Optic Imaging Technologies for Day/Night Oil Spill Detection

2014 ◽  
Vol 2014 (1) ◽  
pp. 299609
Author(s):  
Toomas H. Allik ◽  
Roberta E. Dixon ◽  
Lenard V. Ramboyong ◽  
Mark Roberts ◽  
Thomas J. Soyka ◽  
...  
Keyword(s):  
Oil Spill ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Spectral Characteristics ◽  
Laboratory Data ◽  
Field Tests ◽  
Light Level ◽  
Test Facility ◽  
Imaging Technologies ◽  
Oil Spill Detection

Joint program between the U.S. Departments of the Interior and Defense to bring knowledge, expertise and military, low-light level and hyperspectral imaging technologies to remote oil spill detection. Program emphasis is to determine remote infrared imaging techniques for the quantification of oil spill thickness. Spectral characteristics of various crude oils in the SWIR (1–2 microns), MWIR (3–5 microns) and LWIR (8–12 microns) were measured. Analysis of laboratory data and Deepwater Horizon hyperspectral imagery showed the utility of the SWIR region to detect crude oil and emulsions. We have evaluated two SWIR wavelengths (1200 nm and 1250 nm) for thickness assessment. An infrared, 3-color imager is discussed along with field tests at the BSEE's Ohmsett test facility.

scholarly journals Understanding the conductive channel evolution in Na:WO3−x-based planar devices

Nanoscale ◽  
2015 ◽  
Vol 7 (14) ◽  
pp. 6023-6030 ◽  
Author(s):  
Dashan Shang ◽  
Peining Li ◽  
Tao Wang ◽  
Egidio Carria ◽  
Jirong Sun ◽  
...  
Keyword(s):  
Optical Imaging ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Near Field ◽  
Channel Evolution ◽  
Conductive Channel

The conductive channel evolution in Na:WO3−xfilms is visualized byin situoptical imaging combined with near-field infrared imaging techniques.

scholarly journals Parameters sensitivity assessment and heat source localization using infrared imaging techniques

2021 ◽  
Author(s):  
Maryam Rastgar-Jazi ◽  
Farah Mohammadi
Keyword(s):  
Surface Temperature ◽  
Source Localization ◽  
Body Surface ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Ir Camera ◽  
Non Invasive ◽  
Metabolism Rate ◽  
Sensitivity Assessment ◽  
Body Surface Temperature

Background At present, infrared (IR) imaging is used both as a non-invasive and a non-ionizing technology. Using an IR camera, it is possible to measure body surface temperature in order to detect tumors and malignant cells. Tumors have a high amount of vasculature and an enhanced metabolism rate, which may result in an increase in body surface temperature by several degrees above its normal level.

scholarly journals Optical Coherence Tomography Angiography (OCT-A) in a Patient with Occult Retinal Dysfunction

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Juliana Wons ◽  
Jana Dinges ◽  
Matthias D. Becker ◽  
Stephan Michels
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Field ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Visual Field Defects ◽  
Retinal Layer ◽  
Optical Coherence ◽  
Large Area ◽  
Sd Oct

Multimodal imaging techniques were performed in a patient with a newly emerged visual field defect; a missing retinal lesion on fundus examination made the diagnosis challenging but infrared imaging showed a larger area of retinal abnormality temporal to the fovea. Indocyanine green angiography (IA) showed late hypofluorescence and there was mild hyperautofluorescence which is known from acute zonal occult outer retinopathy (AZOOR). Despite normal fluorescein angiography (FA) results, a perfusion loss in the outer retinal layer was detected by OCT-A. Similar OCT-A findings were recently described in patients with acute macular neuroretinopathy (AMN). Methods. The methods included FA and IA, spectral domain optical coherence tomography (SD-OCT), near infrared imaging, and autofluorescence imaging (AF), as well as OCT-A. Patient. A 36-year-old patient who suffered from acute symptoms of photopsia and scotoma on her left eye. She had an influenza-like illness two weeks earlier. The scotoma could be verified by visual field testing. Results. The affected retinal zone showed mild fading of external limiting membrane (ELM) and a disorganisation of the ellipsoid zone (EZ) on SD-OCT. OCT-A revealed a large area of reduced perfusion in the outer retinal vascular layer. Conclusion. OCT-A can help to detect reduced capillary network in patients with visual field defects and no visible fundus changes. This case seems to have features of different occult retinal disorders such as AZOOR and AMN.

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