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Wyświetlanie 1-10 z 664
Tytuł:
The analysis of the effects of screening helicopter engine compartments for infrared emission
Autorzy:
Fijałkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/102769.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
helicopter
infrared screen
infrared emission
egine gondola
Opis:
The paper presents the research on using infrared screens protecting an engine in an engine gondola in PZL W-3 helicopter to limit infrared emission to the surrounding. The methods of numerical modelling and computing simulation (hover and horizontal flight forward) were applied to the analysis. The results enabled formulating the guidelines to construct screens.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 17; 23-34
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays
Autorzy:
James, Jonathan Ch.
Haran, Terence L.
Lane, Sarah E.
Powiązania:
https://bibliotekanauki.pl/articles/2204205.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared focal plane arrays
III-V semiconductor infrared detector technologies
infrared sensor performance modelling
infrared sensor design
mid-wave and longwave infrared sensors
Opis:
Infrared detector technologies engineered from III-V semiconductors such as strained-layer superlattice, quantum well infrared photodetectors, and quantum dot infrared photodetectors provide additional flexibility to engineer bandgap or spectral response cut-offs compared to the historical high-performance detector technology of mercury/cadmium/telluride. The choice of detector cut-off depends upon the sensing application for which the system engineer is attempting to maximize performance within an expected ensemble of operational scenarios that define objects or targets to be detected against specific environmental backgrounds and atmospheric conditions. Sensor performance is typically characterised via one or more metrics that can be modelled or measured experimentally. In this paper, the authors will explore the impact of detector cut-off wavelength with respect to different performance metrics such as noise equivalent temperature difference and expected target detection or identification ranges using analytical models developed for several representative sensing applications encompassing a variety of terrestrial atmospheric conditions in the mid-wave and long-wave infrared wavelength bands. The authors will also report on their review of recently published literature concerning the relationships between cut-off wavelength and the other detector performance characteristics such as quantum efficiency or dark current for a variety of detector technologies.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144570
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on noise removal in infrared images
Autorzy:
Budzan, S.
Wyżgolik, R.
Powiązania:
https://bibliotekanauki.pl/articles/114180.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermography
infrared images
noise removal
Opis:
Noise removal in IR (Infra Red) images is very popular in recent years, however the same approach is utilized as for vision images, with no or minor changes. In this work we wanted to show the results of noise removal for selected filters. We focused on investigation of some filters normally used for image processing and their influence to IR image quality. In IR imaging the choice of filter depends mainly on the purpose of the processing, e.g. detection of small objects in complex images, edge and contour detection or removal of non-uniformity of the detector array. The performance of the selected noise reduction filters was evaluated using PSNR (Peak Signal-to-Noise Ratio) and MAE (Mean Absolute Error) quality measure, greater value of the PSNR and lower value of the MAE indicate better noise reduction. The results are shown only for few images from our database which contain over 2000 of IR images.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 187-190
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IR technology in marine applications
Autorzy:
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/359089.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
infrared radiation
marine applications
infrared technique
measuring devices
observations
Opis:
The infra-red radiation was discovered in 1800 by English astronomer Sir Wiliam Hirchel but practical appl ications could be dated to the beginning of XX century. First advanced scientific investigations, as well as works relating to the military applications of IR technique were carried out during the First World War. Many applications of IR radiation exist until now. It is generally accepted that taking into account the destination the devices of IR techniques can be divided on three main groups: measuring devices, observation and aut omatic recognition systems. Devices of this type can be found both in Navy and civil marine.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 144-148
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared and visible image fusion with deep wavelet-dense network
Autorzy:
Chen, Yanling
Cheng, Lianglun
Wu, Heng
Chen, Ziyang
Li, Feng
Powiązania:
https://bibliotekanauki.pl/articles/2202762.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
infrared image
image fusion
image processing
infrared image enhancement
Opis:
We propose a high-quality infrared and visible image fusion method based on a deep wavelet-dense network (WT-DenseNet). The WT-DenseNet includes three network layers, the hybrid feature extraction layer, fusion layer, and image reconstruction layer. The hybrid feature extraction layer is composed of a wavelet and dense network. The wavelet network decomposes the feature map of the visible and infrared images into low-frequency and high-frequency components, respectively. The dense network extracts the salient features. A fusion layer is designed to integrate low-frequency and salient features. Finally, the fusion images are outputted by an image reconstruction layer. The experimental results demonstrate that the proposed method can realize high-quality infrared and visible image fusions, and the performance of the proposed method is better than that of the six recently published fusion methods in terms of contrast and detail performance.
Źródło:
Optica Applicata; 2023, 53, 1; 49--64
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Magnesium Powder on the Radiation Characteristics of MTV Foil Infrared Decoys
Autorzy:
Du, J.
Guan, H.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358407.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
military chemistry and pyrotechnics
infrared decoys
magnesium
burning and infrared radiation characteristics
Opis:
The aim of this project was to study how the particle size and morphology of magnesium powder affect the burning and infrared radiation characteristics of foil-type Mg/PTFE/Viton (MTV) infrared decoys. A long-wavelength thermal imager and an OPAG33 Fourier transform infrared remote-sensing spectrometer were used to characterize the burning and infrared radiation. The results show that the burning rate, burning temperature, and far-infrared radiation intensity of the decoys are improved significantly with decreased particle size. The burning rate, burning temperature, and far-infrared radiation intensity of the flake-like powder are higher than for the spherical powder of the same particle size.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 4; 855-863
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of tracking of HAZ properties based on sequence of infrared images
Autorzy:
Fidali, M.
Powiązania:
https://bibliotekanauki.pl/articles/114361.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
infrared imagining
welding monitoring
image processing
Opis:
Arc welding is commonly applied in industry. Assessment of the quality of welded joints is one of crucial tasks especially in automated applications. In the paper preliminary research devoted to the evaluation of Heat Affected Zone (HAZ) properties using method of tracking of defined Region of Interest (ROI) on infrared images continuously acquired during welding process. The proposed method can be useful to detection of welding instabilities as well as welded joint defects.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 143-145
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compression of high dynamic infrared image using auto aggregation algorithm
Autorzy:
Fidali, M.
Jamrozik, W.
Powiązania:
https://bibliotekanauki.pl/articles/114701.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
infrared image
compression
enhancement
high dynamic
Opis:
The article presents a method of compression of High Dynamic Range of infrared image and its details enhancement. The method is based on aggregation of partial images with different ranges of pixel values generated using a weighting function. Aggregation of images could be performed according to proposed scheme with use of the optimal algorithm selected by user. Preliminary results shown that the method can reveal previously hidden details in the original image.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 146-149
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grating-free high-x InP/InxGa1-xAs mid-wavelength infrared QWIP focal plane array
Autorzy:
Besikci, Cengiz
Balcı, Saadettin V.
Tanış, Onur
Güngör, Oğuz O.
Arpaguş, Esra S.
Powiązania:
https://bibliotekanauki.pl/articles/2204209.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared imaging
quantum well
infrared photodetector
Opis:
The authors report the characteristics of a diffraction-grating-free mid-wavelength infrared InP/In₀.₈₅Ga₀.₁₅As quantum well infrared photodetector focal plane array with a 640 × 512 format and a 15 µm pitch. Combination of a normal incident radiation sensing ability of the high-x InxGa1-xAs quantum wells with a large gain property of the InP barriers led to a diffraction-grating-free quantum well infrared photodetector focal plane array with characteristics displaying great promise to keep the status of the quantum well infrared photodetector as a robust member of the new generation thermal imaging sensor family. The focal plane array exhibited excellent uniformity with noise equivalent temperature difference nonuniformity as low as 10% and a mean noise equivalent temperature difference below 20 mK with f/2 optics at 78 K in the absence of grating. Elimination of the diffraction-grating and large enough conversion efficiency (as high as ~70% at a -3.5 V bias voltage) abolish the bottlenecks of the quantum well infrared photodetector technology for the new generation very small-pitch focal plane arrays.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144563
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Detector Characteristic on the Result of Sky Temperature Measurement with the Use of Long-Wave Infrared Camera
Autorzy:
Kruczek, T.
Powiązania:
https://bibliotekanauki.pl/articles/114666.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermovision infrared measurements
sky thermal radiation
sky temperature
characteristic of infrared camera detector
Opis:
During the temperature measurements by means of infrared camera the temperature of surrounding elements must be known. In the case of thermovision inspections of the objects exposed to open air space, the surroundings consists of two elements, it is the ground and hypothetical sky surface. The sky temperature measured by long-wave IR camera is of apparent character because it expresses the thermal radiation of the sky within the spectral operational range of this camera i.e. 7.5÷13 μm. The abovementioned spectral range is coincident with so called atmospheric window within which the thermal radiation of the sky is relatively low. The emissivity of atmosphere within this window is low in the central part and high near the limits of the aforementioned range. In relation with the detector characteristic of the IR camera it causes underestimation of the measured sky temperature. This work deals with the analysis of influence of the IR camera detector characteristic on the results of determination of sky temperature and its thermal radiation intensity.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 173-175
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 664

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