1. Background purification framework with extended morphological attribute profile for hyperspectral anomaly detectionJu Huang, Kang Liu, Mingliang Xu, Matjaž Perc, Xuelong Li, 2021, izvirni znanstveni članek Opis: Hyperspectral anomaly detection has attracted extensive interests for its wide use in military and civilian fields, and three main categories of detection methods have been developed successively over past few decades, including statistical model-based, representation-based, and deep-learning-based methods. Most of these algorithms are essentially trying to construct proper background profiles, which describe the characteristics of background and then identify the pixels that do not conform to the profiles as anomalies. Apparently, the crucial issue is how to build an accurate background profile; however, the background profiles constructed by existing methods are not accurate enough. In this article, a novel and universal background purification framework with extended morphological attribute profiles is proposed. It explores the spatial characteristic of image and removes suspect anomaly pixels from the image to obtain a purified background. Moreover, three detectors with this framework covering different categories are also developed. The experiments implemented on four real hyperspectral images demonstrate that the background purification framework is effective, universal, and suitable. Furthermore, compared with other popular algorithms, the detectors with the framework perform well in terms of accuracy and efficiency. Ključne besede: detectors, anomaly detection, image reconstruction, hyperspectral imaging, training, optics, dictionaries, background purification, extended attribute profile, sparse representation, stacked autoencoder Objavljeno v DKUM: 19.08.2024; Ogledov: 92; Prenosov: 9
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3. Načrtovanje proizvodnega procesa standardizirane montaže optike za puško Blaser R8 v podjetju Optics trade d.o.o. : diplomsko deloLuka Črnčič, 2021, diplomsko delo Opis: Cilj diplomske naloge je bil načrtovanje proizvodnega procesa za izdelek, ki smo ga modelirali v sklopu projektne naloge, pri predmetih Razvoj izdelka, Upravljanje proizvodnje in Projektni praktikum v sodelovanju s podjetjem Optics trade d. o. o.. Ker podjetje Optics trade nima lastne proizvodnje, je bil proizvodni proces načrtovan na splošno, s pomočjo programske opreme Solidworks. Določili smo potrebne operacije za posamezne komponente izdelka in predlagali orodja ter stroj, s katerim bi proizvodni proces lahko izvedli. S pomočjo tega smo predvideli čas trajanja in stroške načrtovanega proizvodnega procesa ter ocenili predlagane rešitve iz različnih zornih kotov. Glede na predvidene stroške smo predvideli prodajno ceno izdelka ter podali nekaj predlogov za optimizacijo procesa. Ključne besede: Proizvodni proces, delovne operacije, montaža, čas trajanja, določitev stroškov, Optics trade d. o. o. Objavljeno v DKUM: 13.10.2021; Ogledov: 831; Prenosov: 79
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4. A low bending loss multimode fiber transmission systemDenis Đonlagić, 2009, izvirni znanstveni članek Opis: This paper presents a high bend tolerant multimode optical fiber transmission system that is compatible with standard 50 ìm graded index multimode fiber, interms of achievable bandwidth and interconnectivity losses. When the 10 loops of the proposed bend resistive multimode fiber were wrapped around a cylinder of 1.5 mm radius, bend losses below -0.2 dB were achieved in case of experimentally produced fiber. Furthermore, when the section of the proposed bend resistive fiber was inserted between two sections of a standard 50 ìm graded index multimode fiber, the total experimental measured loss proved to be below -0.15 dB. Ključne besede: optical fiber transmission systems, bending loss, bend resistive multimode fiber, optical communications, fiber optics Objavljeno v DKUM: 31.05.2012; Ogledov: 2663; Prenosov: 116
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5. Quasi-distributed long-gauge fiber optic sensor systemMatjaž Linec, Denis Đonlagić, 2009, izvirni znanstveni članek Opis: This paper presents a quasi-distributed, long-gauge, sensor system for measurement optical path length variation. This system can be directly applied to long gauge strain and/or temperature sensing. The proposed sensor system is comprised of sensing fiber, which is divided into the sensorćs segments separated by semi reflective mirrors made out of standard optical connectors. Short duration radio-frequency modulated optical bursts are launched into the sensing fiber and phase differences among individual reflected bursts are measured to determine the optical path-length variations among neighboring mirrors. Twenty sensing fiber segments were successfully addressed by a single-signal processor, while relying on standard telecommunication PIN diode, and a Fabry Perot laser diode. The resolution of a fiber-length variation better than 5 ìm was demonstrated in practice. Since the long sections of fiber can be employed for constructing individual sensors within the sensor's array, a microstrain resolution can be achieved in practice. The drift of the sensorćs system can be predominantly attributed to the temperature sensitivity of the electronic components, which proved to be below 20 um/°C. The entire system relies on simple and widely-used components that are low-cost. Ključne besede: fiber optic systems, fiber optics sensors, sensing fiber, long-gauge, strain sensing, temperature sensing, optoelectronics Objavljeno v DKUM: 31.05.2012; Ogledov: 2527; Prenosov: 114
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6. All-fiber quasi-distributed polarimetric temperature sensorDenis Đonlagić, Miran Lešič, 2006, izvirni znanstveni članek Opis: This paper presents an all-fiber design of a quasi-distributed polarimetric temperature sensor array that utilizes commercially available single polarization and high birefringence fibers. The modulation depth of temperature induced loss and the operational temperature range of individual sensors in the network are set by the rotational alignment of fibers before fusion splicing and through fine adjustment of the sensing fiber lengths. A practical sensor network was built with sensors that operated in the temperature range from 0 to 100 C. Individual sensors in the network generatedtemperature dependent loss that changed proportionally from 0.9 to 1.8 dB. With current standard telecommunication OTDRs, more than 20 prototype sensors could be interrogated. Ključne besede: fiber optics, sensors, temperature measurements, polarization, alignement, birefringence, polarization maintaining Objavljeno v DKUM: 31.05.2012; Ogledov: 2384; Prenosov: 114
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