Far-Infrared Fresnel Lens for Thermal Imaging

2013 ◽  
Vol 133 (7) ◽  
pp. 274-279
Author(s):  
Tomoyuki Takahata ◽  
Kiyoshi Matsumoto ◽  
Isao Shimoyama
Keyword(s):  
Thermal Imaging ◽  
Far Infrared ◽  
Fresnel Lens

scholarly journals Infrared: A Key Technology for Security Systems

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Carlo Corsi
Keyword(s):  
Thermal Imaging ◽  
Energy Savings ◽  
Low Cost ◽  
Far Infrared ◽  
Building Structures ◽  
Security Systems ◽  
Infrared Wavelength ◽  
Security Applications ◽  
Medical Diagnostic ◽  
Military Systems

Infrared science and technology has been, since the first applications, mainly dedicated to security and surveillance especially in military field, besides specialized techniques in thermal imaging for medical diagnostic and building structures and recently in energy savings and aerospace context. Till recently the security applications were mainly based on thermal imaging as surveillance and warning military systems. In all these applications the advent of room temperature, more reliable due to the coolers avoidance, low cost, and, overall, completely integrable with Silicon technology FPAs, especially designed and tailored for specific applications, smart sensors, has really been impacted with revolutionary and new ideas and system concepts in all the infrared fields, especially for security applications. Lastly, the advent of reliable Infrared Solid State Laser Sources, operating up to the Long Infrared Wavelength Band and the new emerging techniques in Far Infrared Submillimeter Terahertz Bands, has opened wide and new areas for developing new, advanced security systems. A review of all the items with evidence of the weak and the strong points of each item, especially considering possible future developments, will be reported and discussed.

scholarly journals Finding Mammals Using Far-Infrared Thermal Imaging

1994 ◽  
Vol 75 (4) ◽  
pp. 1063-1068 ◽  
Author(s):  
R. Boonstra ◽  
C. J. Krebs ◽  
S. Boutin ◽  
J. M. Eadie
Keyword(s):  
Thermal Imaging ◽  
Far Infrared ◽  
Infrared Thermal Imaging

scholarly journals Chocolate Terahertz Fresnel Lens

2020 ◽  
Vol 12 (4) ◽  
pp. 103
Author(s):  
Mateusz Surma ◽  
Paweł Komorowski ◽  
Maciej Neneman ◽  
Agnieszka Siemion
Keyword(s):  
Terahertz Spectroscopy ◽  
Complex Refractive Index ◽  
Optical Element ◽  
Far Infrared ◽  
Computational Design ◽  
Fresnel Lens ◽  
Polymer Materials ◽  
Terahertz Waves ◽  
International Conference ◽  
3D Printed

Recent enormous development of 3D printing techniques gave the possibility of precise manufacturing of designed optical structures. This paper presents designing, manufacturing and the results obtained for chocolate Fresnel lens. Chocolate, similarly to wax, can be melted and used in the 3D printed form to create a terahertz (THz) optical element. Parameters of the chocolate lens are compared with the one made of wax. In simple applications both materials can be used as a cost-effective alternative for conventional optical materials used for THz range of radiation. Both lenses have been designed and compared for 140 GHz. Full Text: PDF ReferencesM. Naftaly, R.E. Miles, and P.J. Greenslade, "THz transmission in polymer materials — a data library", Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics, 819-820 (2007). CrossRef S. Firoozabadi, F. Beltran-Mejia, A. Soltani, D. Jahn, S.F. Busch, J.C. Balzer, and M. Koch, "THz transmission blazed grating made out of paper tissue", 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1-2 (2017). CrossRef D. Headland, W. Withayachumnankul, M. Webb, H. Ebendorff-Heidepriem, A. Luiten, and D. Abbott, "Analysis of 3D-printed metal for rapid-prototyped reflective terahertz optics", Optics express 24(15), 17384-17396 (2016). CrossRef S.F. Busch, M. Weidenbach, M. Fey, F. Schäfer, T. Probst, and M. Koch, "Optical Properties of 3D Printable Plastics in the THz Regime and their Application for 3D Printed THz Optics", Journal of Infrared, Millimeter, and Terahertz Waves 35(12), 993-997 (2014). CrossRef C. Jördens, and M. Koch, "Detection of foreign bodies in chocolate with pulsed terahertz spectroscopy", Optical Engineering 47(3), 037003 (2008). CrossRef A.D. Squires, E. Constable, and R.A. Lewis, "3D Printed Terahertz Diffraction Gratings And Lenses", Journal of Infrared, Millimeter, and Terahertz Waves 36(1), 72-80 (2015). CrossRef W. D. Furlan, V. Ferrando, J. A. Monsoriu, P. Zagrajek, E. Czerwińska, and M. Szustakowski, "3D printed diffractive terahertz lenses", Optics letters 41(8), 1748-1751 (2016). CrossRef X. Wei, C. Liu, L. Niu, Z. Zhang, K. Wang, Z. Yang, and J. Liu, "Generation of arbitrary order Bessel beams via 3D printed axicons at the terahertz frequency range", Applied optics 54(36), 10641-10649 (2015). CrossRef S. Banerji, and B. Sensale-Rodriguez, "3D-printed diffractive terahertz optical elements through computational design", Micro-and Nanotechnology Sensors, Systems, and Applications XI 10982, 109822X, International Society for Optics and Photonics (2019). CrossRef M. Surma, I. Ducin, P. Zagrajek, and A. Siemion, "Sub-Terahertz Computer Generated Hologram with Two Image Planes", Applied Sciences 9(4), 659 (2019). CrossRef A. Siemion, P. Komorowski, M. Surma, I. Ducin, P. Sobotka, M. Walczakowski, and E. Czerwińska, "Terahertz diffractive structures for compact in-reflection inspection setup", Optics Express 28(1), 715-723 (2020). CrossRef E.R. Brown, J.E. Bjarnason, A.M. Fedor, and T.M. Korter, "On the strong and narrow absorption signature in lactose at 0.53THz", Applied Physics Letters 90(6), 061908 (2007). CrossRef M. Bernier, F. Garet, and J. L. Coutaz, "Determining the Complex Refractive Index of Materials in the Far-Infrared from Terahertz Time-Domain Data", Terahertz Spectroscopy-Cutting Edge Technology, Intech-Open Science (2017). CrossRef E.Hecht, Optics 5th global ed.(Boston, Pearson Education 2017). DirectLink

scholarly journals Photo-activated raster scanning thermal imaging at sub-diffraction resolution

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Bouzin ◽  
M. Marini ◽  
A. Zeynali ◽  
M. Borzenkov ◽  
L. Sironi ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Super Resolution ◽  
Far Infrared ◽  
Biological Tissues ◽  
Morphological Properties ◽  
Temperature Variations ◽  
Synthetic Materials ◽  
Skin Biopsies ◽  
Nondestructive Characterization

AbstractActive thermal imaging is a valuable tool for the nondestructive characterization of the morphological properties and the functional state of biological tissues and synthetic materials. However, state-of-the-art techniques do not typically combine the required high spatial resolution over extended fields of view with the quantification of temperature variations. Here, we demonstrate quantitative far-infrared photo-thermal imaging at sub-diffraction resolution over millimeter-sized fields of view. Our approach combines the sample absorption of modulated raster-scanned laser light with the automated localization of the laser-induced temperature variations imaged by a thermal camera. With temperature increments ∼0.5–5 °C, we achieve a six-time gain with respect to our 350-μm diffraction-limited resolution with proof-of-principle experiments on synthetic samples. We finally demonstrate the biological relevance of sub-diffraction thermal imaging by retrieving temperature-based super-resolution maps of the distribution of Prussian blue nanocubes across explanted murine skin biopsies.

Detection of Atherosclerosis Through Mapping Skin Temperature Variation Caused by Carotid Atherosclerosis Plaques

2011 ◽  
Vol 3 (3) ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Surface Temperature ◽  
Skin Temperature ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Imaging System ◽  
Human Subjects ◽  
Far Infrared ◽  
Skin Surface ◽  
Skin Surface Temperature ◽  
Infrared Thermal Imaging

This paper reports the effects of atherosclerosis plaque on the human cervicum skin surface temperature. The classical Pennes bioheat equation and a 3-D model consisting of cervical vertebra, muscle, and skin layer is adopted to characterize the heat transfer in the cervicum. Since the formation of atherosclerotic plaque is random, several parametric analyses are conducted to simulate actual situations. A medical far-infrared thermal imaging system is employed on two healthy human subjects to evaluate the feasibility of this technique. According to the simulations, there are variations in the temperature contours on the surface of the skin due to the axial variations in thermal parameters between healthy arterial intimae and atherosclerosis plaque. This suggests that far-infrared thermal imaging can be used to detect the marker safely via a noncontact way. Additional parametric studies indicated that the cervicum skin surface temperature distribution discloses the information regarding the plaque such as position, depth, pattern, quantity, and metabolic heat generation, etc. Furthermore, the external thermal conditions and calm physiological state can be implemented to enhance the detection of the plaque via mapping skin temperature. To test this strategy, a far-infrared imaging system was applied to record the dynamic thermal pictures on the cervicum of two human subjects, and the intentional cooling by the alcohol was proposed to improve detection. The thermograph reveals the surface effects of the main blood vessel and organs in the cervicum. The present study sets up a theoretical foundation for using noncontact far-infrared imaging method for a reliable assessment of atherosclerosis plaque without causing any wound or radiation to human body.

Thermal imaging method to visualize a hidden painting thermally excited by far infrared radiations

2015 ◽  
Author(s):  
T. Davin ◽  
X. Wang ◽  
A. Chabane ◽  
R. Pawelko ◽  
G. Guida ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Far Infrared ◽  
Imaging Method ◽  
Hidden Painting

scholarly journals Novelty Surface Coatings for Far Infrared Spectrum Black Body Radiators

2021 ◽  
Vol 25 (4) ◽  
pp. 77-82
Author(s):  
Andrzej Ligienza ◽  
Grzegorz Bieszczad ◽  
Tomasz Sosnowski ◽  
Bartosz Bartosewicz ◽  
Krzysztof Firmanty
Keyword(s):  
Thermal Imaging ◽  
Far Infrared ◽  
Black Body ◽  
Black Body Radiation ◽  
Surface Coatings ◽  
Reference Surface ◽  
Emitter Surface ◽  
Radiation Sources ◽  
Physical Approximation ◽  
Planck’S Law

Black body radiation sources are commonly used devices in areas related to thermal imaging and radiometry. They are the closest physical approximation of theoretical black body emitter derived from the Planck’s law. Majority of such devices are costly with restricted information about their production technology, including their emitter surface. A few relatively easily accessible coatings with potential application in such devices have been chosen and their emissivity measured. The paper presents measurements that provides information necessary to determine whether there are coatings viable for black body emitter or reference surface.

Far-Infrared Imaging Method for Non-Contact Monitoring of Ice Valve Array in Controlling Micro/Nano Fluidics

2011 ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Temperature Distribution ◽  
Convenient Method ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Imaging System ◽  
Far Infrared ◽  
Imaging Method ◽  
Infrared Thermal Imaging ◽  
Surface Temperature Distribution ◽  
Thermal Imaging System

Ice valve is a unique kind of micro valve without any moving elements and leakage. While in its operational process, appropriate control on the valve depends on well knowing the working statues of the valve system. In order to develop a quick and convenient method for guiding the operation of the ice valve, this paper is dedicated to establish a non-contact image way for monitoring the ice valve during controlling the micro fluid. The far-infrared thermal imaging system was adopted to detect and map the surface temperature distribution of the ice valve, which consequently could help achieve the non-contact monitoring of the ice valve.

Far-Infrared Imaging Method for Non-Contact Monitoring of Micromixer

2011 ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Convenient Method ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Imaging System ◽  
Flow Behavior ◽  
Far Infrared ◽  
Imaging Method ◽  
Working Process ◽  
Infrared Thermal Imaging ◽  
Thermal Imaging System

For many Lap-on-a-Chip applications, rapid and homogenous mixing of two or more fluid species is inevitable. However, it is also of great importance to developing a quick and convenient method for monitoring the mixture processing, as well as the entire working process of the Lab-on-a-chip. In order to develop a quick and convenient method, this paper is dedicated to establish a non-contact image way for monitoring not only the liquid flow behavior, but also the mixability between each reactant. The far-infrared thermal imaging system was adopted to detect and map the surface temperature distribution of the micromixer, which consequently could help achieve the non-contact monitoring of the mixing process.

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