scholarly journals JUSTIFICATION OF REQUIREMENTS FOR INFRARED RANGE LENSES STATIONED AT AIRCRAFT

2020 ◽  
Vol 6 (1) ◽  
pp. 173-180
Author(s):  
Julia S. Kiseleva ◽  
Tatiana N. Khatsevich
Keyword(s):  
Thermal Imaging ◽  
Infrared Range ◽  
Single Lens ◽  
Infrared Materials

The article discusses the requirements for the lens of thermal imaging devices, and formulates special requirements for their placement on aircraft. Thermooptic aberrations of a single lens made of various infrared materials are analyzed. The values of the thermooptic constant for some materials are given. A condition for eliminating thermal refocusing for a single lens is given.

scholarly journals METHODOLOGY OF DETECTION OF THERMAL REFLECTIONS IN THE INFRARED RANGE

2021 ◽  
Author(s):  
Valentin G. Kolobrodov ◽  
Viktoriia P. Nalbandova ◽  
Bohdan V. Sokol
Keyword(s):  
Thermal Imaging ◽  
Optical Methods ◽  
Stokes Parameters ◽  
Observation System ◽  
Infrared Range ◽  
Common Source ◽  
Advantages And Disadvantages ◽  
Reflected Light ◽  
Imaging Surveillance ◽  
The Cost

Background. Thermal reflections are a common source of problems in the interpretation of infrared (IR) thermal images. In particular, wet or polished surfaces, such as glass, metals, as well as brick and concrete, can easily reflect infrared radiation but are often overlooked. If left unchecked, these thermal reflections can lead to incorrect detection and recognition of the object or misinterpretation of its actual temperature. Objective. The purpose of a theoretical analysis between the thermal radiation of an object and its reflection is to develop methods for the possibility of attenuation or at least identification of such prints using optical methods. Methods. Light becomes polarized when it interacts with an object or matter through various mechanisms, such as scattering, reflection, or transmission. One of the possibilities of implementing such methods is the use of IR polarizers in combination with thermal imaging surveillance system. Results. Article describes the physical and mathematical model of fingerprint detection and the possibilities of their elimination. The reflected light is partially polarized, so the main approach to its identification is to find the Stokes parameters. The authors considered three main methods for analyzing the state of polarization: the use of a rotating polarizer in front of the observation system, a special matrix with polarizers located on top of each pixel at certain angles, and a method based on dividing the amplitude in the polarimeter. full Stokes vector. Conclusions. The advantages and disadvantages of the considered methods were revealed. The main features of structures and the cost of their implementation, which are necessary for each method, were determined, with the further purpose of their use in the development of a polarizing thermal imaging camera for unmanned aerial vehicles.

Methods for Properties Analysis of Crystalline Materials Based on Solid Solutions of Silver and Thallium (I) Halides

2021 ◽  
Vol 410 ◽  
pp. 758-763
Author(s):  
Anastasia A. Yuzhakova ◽  
Dmitrii D. Salimgareev ◽  
Liya V. Zhukova
Keyword(s):  
Solid Solutions ◽  
Far Infrared ◽  
High Accuracy ◽  
Infrared Range ◽  
Crystalline Materials ◽  
Mechanical And Electrical Properties ◽  
Optical Crystals ◽  
Properties Of Materials ◽  
Infrared Materials ◽  
Accuracy And Repeatability

The paper presents a set of methods developed for properties control of new optical crystals based on solid solutions of silver and thallium (I) halides. Crystals and optical products based on them are used for optical and optoelectronic systems in the middle and far infrared range. In this regard, to analyze the properties of new infrared materials, new analysis methods are required, which provide high accuracy and repeatability of the results. The authors have developed methods for studying the optical, mechanical and electrical properties of materials. The studies’ results carried out by these methods for various systems of silver and thallium (I) halides solid solutions are presented.

scholarly journals Active athermalization of dual-infrared zoom lenses

2020 ◽  
Vol 44 (6) ◽  
pp. 931-936
Author(s):  
G.I. Greisukh ◽  
I.A. Levin ◽  
S.V. Kazin
Keyword(s):  
Thermal Imaging ◽  
Entire Range ◽  
Optical Axis ◽  
Focal Length ◽  
Dual Band ◽  
Length Variation ◽  
Simple Design ◽  
Optical Components ◽  
Long Wavelength ◽  
Single Lens

For medium- and long-wavelength dual-band infrared refractive and refractive-diffractive thermal imaging zoom lenses of simple design, we show that it is possible to maintain superb and practically unchanged optical characteristics across the temperature range from –40 to +40°C in the entire range of focal length variation. Athermalization for any focal length is achieved by moving one double-lens component or a single lens along the optical axis of the lens. Considering that these optical components are not involved in the zooming process, it becomes possible to both compensate for thermal defocusing and focus the lens on the object of interest using the same focusing mechanism, while maintaining the size and tightness of the optical system.

Thermal Imaging and 'The Fourth'

2001 ◽  
Author(s):  
Keyword(s):  
Thermal Imaging

Computerized Thermal Imaging

2020 ◽  
Author(s):  
Keyword(s):  
Thermal Imaging

Remote Investigation of Buildings' Heat Losses by Thermal Imaging Technique

2009 ◽  
Vol 5 (1) ◽  
pp. 31-35
Author(s):  
F.F. Sizov ◽  
◽  
V.V. Zabudsky ◽  
A.G. Golenkov ◽  
S.L. Kravchenko ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Imaging Technique ◽  
Heat Losses

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
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