Thematische Bibliographien / Optos

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Auswahl der wissenschaftlichen Literatur zum Thema „Optos“

Autor: Grafiati

Veröffentlicht am 25. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Optos"

Nagasawa, Toshihiko, Hitoshi Tabuchi, Hiroki Masumoto, Shoji Morita, Masanori Niki, Zaigen Ohara, Yuki Yoshizumi und Yoshinori Mitamura. „Accuracy of Diabetic Retinopathy Staging with a Deep Convolutional Neural Network Using Ultra-Wide-Field Fundus Ophthalmoscopy and Optical Coherence Tomography Angiography“. Journal of Ophthalmology 2021 (03.04.2021): 1–10. http://dx.doi.org/10.1155/2021/6651175.

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Purpose. The present study aimed to compare the accuracy of diabetic retinopathy (DR) staging with a deep convolutional neural network (DCNN) using two different types of fundus cameras and composite images. Method. The study included 491 ultra-wide-field fundus ophthalmoscopy and optical coherence tomography angiography (OCTA) images that passed an image-quality review and were graded as no apparent DR (NDR; 169 images), mild nonproliferative DR (NPDR; 76 images), moderate NPDR (54 images), severe NPDR (90 images), and proliferative DR (PDR; 102 images) by three retinal experts by the International Clinical Diabetic Retinopathy Severity Scale. The findings of tests 1 and 2 to identify no apparent diabetic retinopathy (NDR) and PDR, respectively, were then assessed. For each verification, Optos, OCTA, and Optos OCTA imaging scans with DCNN were performed. Result. The Optos, OCTA, and Optos OCTA imaging test results for comparison between NDR and DR showed mean areas under the curve (AUC) of 0.79, 0.883, and 0.847; sensitivity rates of 80.9%, 83.9%, and 78.6%; and specificity rates of 55%, 71.6%, and 69.8%, respectively. Meanwhile, the Optos, OCTA, and Optos OCTA imaging test results for comparison between NDR and PDR showed mean AUC of 0.981, 0.928, and 0.964; sensitivity rates of 90.2%, 74.5%, and 80.4%; and specificity rates of 97%, 97%, and 96.4%, respectively. Conclusion. The combination of Optos and OCTA imaging with DCNN could detect DR at desirable levels of accuracy and may be useful in clinical practice and retinal screening. Although the combination of multiple imaging techniques might overcome their individual weaknesses and provide comprehensive imaging, artificial intelligence in classifying multimodal images has not always produced accurate results.

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Aragón, V., Á. García, R. Amaro, C. Martínez, F. Sarmiento, J. Cabo und M. Sempere. „OPTOS communications: A high-performance solution“. Microwave and Optical Technology Letters 54, Nr. 4 (16.02.2012): 943–46. http://dx.doi.org/10.1002/mop.26717.

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Ghahghaei, Saeideh, und Laura Walker. „SKERI-Optos: A Graphical User Interface to Map Scotoma and PRL with the Optos OCT/SLO“. Journal of Vision 16, Nr. 4 (12.02.2016): 40. http://dx.doi.org/10.1167/16.4.41.

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Lau, Chap-Kay Kendra, und Gloria Wu. „Smartphone Camera to Image the Retina for Primary Care MDs and Diabetologists“. Journal of the Endocrine Society 5, Supplement_1 (01.05.2021): A401. http://dx.doi.org/10.1210/jendso/bvab048.816.

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Abstract Background: Imaging is an important tool for diagnosis of hypertension and diabetes for all physicians. In the US, 300 million smartphones were purchased in 2019. Purpose: A smartphone-based ophthalmoscope for fundus imaging was compared to an office based retina camera to evaluate the average time spent on each device. Methods: Inclusion criteria: Patients with 20/20-20/50 vision, informed consent was obtained. D-Eye/iphone digital direct ophthalmoscope (Padova, Italy) was used on the dilated and undilated eyes of patients, video recorded to attain an image of the optic nerve and internally timed in the iPhone. Optos (Marlborough, MA) was then used to take retinal images of both dilated and undilated eyes of patients for comparison. The start time and end time was recorded from the timestamp of the 1st and last image taken on Optos, then the difference between both timestamps was calculated to obtain time spent on Optos. Results: For dilated patients (n=12, 24 eyes), the average time taken to obtain a clear video of both eyes using D-Eye was 28.08 seconds. The average time to take images of both eyes using Optos was 1.83 minutes. For undilated patients (n=10, 20 eyes), the average time of a clear video of both eyes using D-Eye was 29.8 seconds. The average time to take clear images of both eyes using Optos was 1.2 minutes. Conclusion: The portable D-Eye attachment may be useful at primary care settings, eye MD offices, bedside, ER, and wheelchair patients for evaluation and diagnosis. The D-Eye attachment for the smartphone is useful for imaging both dilated and undilated eyes. We look forward to future studies of the D-Eye for more complex retinal images.

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Rivas Abalo, J., J. Martínez Oter, I. Arruego Rodríguez, A. Martín-Ortega Rico, J. R. de Mingo Martín, J. J. Jiménez Martín, B. Martín Vodopivec, S. Rodríguez Bustabad und H. Guerrero Padrón. „OWLS as platform technology in OPTOS satellite“. CEAS Space Journal 9, Nr. 4 (11.11.2017): 543–54. http://dx.doi.org/10.1007/s12567-017-0178-0.

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Matsui, Yoshitsugu, Atsushi Ichio, Asako Sugawara, Eriko Uchiyama, Hitomi Suimon, Hisashi Matsubara, Masahiko Sugimoto, Kengo Ikesugi und Mineo Kondo. „Comparisons of Effective Fields of Two Ultra-Widefield Ophthalmoscopes, Optos 200Tx and Clarus 500“. BioMed Research International 2019 (05.12.2019): 1–7. http://dx.doi.org/10.1155/2019/7436293.

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Purpose. To compare the effective fields of the Optos 200Tx® and Clarus 500™, two ultra-widefield ophthalmoscopes, based on their ability to image branches of retinal vessel in the four retinal quadrants. Methods. Ninety retinal images from 90 patients with various eye diseases were studied. All patients had undergone 200° retinal imaging to obtain a single image of Optos (O) and the montage of two images of the Clarus (C). The highest number of traceable vessel branches in the four retinal quadrants was determined by two masked raters. An image was classified as “O > C” when the number of identifiable branch was greater in the Optos than the Clarus, as “O = C” when the number was equal and as “O < C” when the number was fewer in the Optos than the Clarus. Results. The appearance probability of “O > C” was significantly higher at the upper temporal quadrant than “O < C” (p<0.01 for both raters). In contrast, the appearance probability of “O < C” was significantly higher at the lower nasal quadrant than “O > C” (p<0.01 for both raters). There were no significant differences in the appearance probability between “O > C” and “O < C” at the other two retinal quadrants (p>0.50 for both raters). Conclusions. These results demonstrate that the effective field of views was different between the two devices at different retina quadrants. Further studies are needed to clarify possible factors such as artifacts by the eyelashes, differences in the depth of focus, motion of the device, and different locations of the images on the effective field of views.

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Fierz, Fabienne C., und Chetan K. Patel. „Optos ultra-widefield imaging in intubated pediatric patients“. Journal of American Association for Pediatric Ophthalmology and Strabismus 22, Nr. 4 (August 2018): e54. http://dx.doi.org/10.1016/j.jaapos.2018.07.197.

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Duisdieker, Viola, Monika Fleckenstein, Katharina M. Zilkens, Julia S. Steinberg, Frank G. Holz und Steffen Schmitz-Valckenberg. „Long-Term Follow-Up of Fundus Autofluorescence Imaging Using Wide-Field Scanning Laser Ophthalmoscopy“. Ophthalmologica 234, Nr. 4 (2015): 218–26. http://dx.doi.org/10.1159/000439358.

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Aim: To evaluate the variation of peripheral alterations in different retinal diseases over a period of >3 years by using wide-field fundus autofluorescence (FAF) scanning laser ophthalmoscopy (SLO). Methods: A total of 26 eyes from 13 patients (median age 66 years, range 19-80) with age-related macular degeneration and other retinal degenerations were examined. In 2009, the Optos P200CAF prototype and from 2012 onwards, the Optos 200Tx (Optos plc, Scotland) were used for wide-field FAF SLO (excitation 532 nm). Results: The area involvement in outer retinal pathological alterations, such as atrophy and mottling of the retinal pigment epithelium far beyond the vascular arcades, was readily and better visualized within one image frame using wide-field FAF as compared to pseudocolor SLO of the same device. Over time, progression of existing and the development of de novo peripheral lesions were recorded with a concomitant enlargement of central lesions. In two cases (unilateral paravenous pigmented choroidal atrophy and suspected phenocopy of retinal dystrophy), no longitudinal changes of the topographic distribution of peripheral FAF intensities were noted. Conclusions: Wide-field FAF SLO allows the mapping of dynamic changes at the outer retina far beyond the vascular arcades. While its ability to detect and monitor these changes appears to be better than that of pseudocolor imaging, wide-field FAF SLO may not only be helpful to assess more widespread retinal dysfunction, but may also be useful for longitudinal assessments in natural history studies and interventional clinical trials.

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Nagasawa, Toshihiko, Hitoshi Tabuchi, Hiroki Masumoto, Hiroki Enno, Masanori Niki, Hideharu Ohsugi und Yoshinori Mitamura. „Accuracy of deep learning, a machine learning technology, using ultra-wide-field fundus ophthalmoscopy for detecting idiopathic macular holes“. PeerJ 6 (22.10.2018): e5696. http://dx.doi.org/10.7717/peerj.5696.

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We aimed to investigate the detection of idiopathic macular holes (MHs) using ultra-wide-field fundus images (Optos) with deep learning, which is a machine learning technology. The study included 910 Optos color images (715 normal images, 195 MH images). Of these 910 images, 637 were learning images (501 normal images, 136 MH images) and 273 were test images (214 normal images and 59 MH images). We conducted training with a deep convolutional neural network (CNN) using the images and constructed a deep-learning model. The CNN exhibited high sensitivity of 100% (95% confidence interval CI [93.5–100%]) and high specificity of 99.5% (95% CI [97.1–99.9%]). The area under the curve was 0.9993 (95% CI [0.9993–0.9994]). Our findings suggest that MHs could be diagnosed using an approach involving wide angle camera images and deep learning.

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Sisk, Robert A., Prashant K. Parekh und Christopher D. Riemann. „Fingerprint Macula Artifact on Optos Fundus Imaging in Nystagmus“. Ophthalmology 127, Nr. 1 (Januar 2020): 96. http://dx.doi.org/10.1016/j.ophtha.2019.09.020.

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Dissertationen zum Thema "Optos"

von, Belino-Bielinowicz Anke, und Karin Holmgren. „Uppfattning om Optos i samband med screening av diabetesretinopati : en tvärprofessionell enkätstudie på ögonmottagningar i Sverige“. Thesis, Linnéuniversitetet, Institutionen för hälso- och vårdvetenskap (HV), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105028.

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Bakgrund: Alla diabetiker erbjuds screening av ögonbottnen för diabetesretinopati så att den ska kunna upptäckas och behandlas i tid. Enligt Region Skånes riktlinje för screening av diabetesretinopati kan en traditionell funduskamera eller en wide field ka-mera som täcker 80 procent av näthinnan användas, något som hittills enbart Optos kan. Syftet med studien var att undersöka hälso- och sjukvårdspersonalens uppfattningar om Optos i samband med screening av diabetesretinopati. Metod: Femton ögonmottagningar visade sig använda Optos. Av dessa deltog tio i tvär-snittsenkätstudien. En webbenkät utformades bestående av öppna och multiple-choice frågor. Fritextsvaren analyserades med innehållsanalys som resulterade i ett antal kategorier och respektive svarsfrekvenser. Resultat: Optos uppfattades som en användar- och patientvänlig metod vilken kan öka tillgängligheten. Skärpan i Optomap uppfattades vara god, men något sämre än i fun-dusbilderna. Några uppfattade Optos som en bra metod för screening av diabetesretino-pati. Andra ansåg att användning av Optos skulle innebära en patientrisk. Då den sämre centrala skärpan skulle kunna leda till underdiagnosticering alternativt att Optomaps stora täckningsgrad skulle kunna vara anledning till en överdiagnosticering. Ett stort externt bortfall begränsar studieresultatets generaliserbarhet. Slutsats: Uppfattningar huruvida Optos anses vara lämpligt att användas i samband med screening av diabetesretinopati går isär och lämpliga användningsområden behöver definieras närmare.
Background: Screening for retinopathy is offered to all diabetics to allow detection and treatment on time. According to a regional guideline for screening of diabetic retino-pathy traditional fundus camera may be used or a wide field camera picturing 80 % of the retina, something nowadays only Optos can do. Aim of this study was to investigate health personnel’s attitude towards Optos in the context of diabetic retinopathy screening. Methods: Fifteen eye clinics using Optos were identified and ten of those took part in this survey. Self-administered questionnaires with multiple-choice and open questions were used. Free text answers were analysed using context analysis with determination of frequencies for the evolving categories. Results: Optos was perceived as being user and patient friendly, as well as being able to increase accessibility. Optomap had good but digital fundus pictures better perceived acuity. According to some was Optos a good method for screening of diabetic retino-pathy and inappropriate according to others apprehending a patient risk. Expecting underdiagnosis due to less central acuity alternatively overdiagnosis due to Optomap covering 80 % of the retina. High drop-out rate eventuates limited validity. Conclusions: Diverging attitudes emerged whether Optos is suitable for screening of diabetic retinopathy. Its appropriate use needs to be defined in further detail.

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Fournstedt, Daniel. „Jämförelse mellan Scheimpflug imaging och anterior segment OCT i mätning av Corneal tjocklek“. Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-44694.

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Purpose: The purpose of this study was to compare corneal thickness measured both centrally and midperipherally, between two instruments using different measuring principles. The study also looked at correlation between corneal thickness and intraocular pressure (IOP). Methods: Central and midperipheral corneal thickness was measured on the right eyes of 31 subjects with two different instruments. Instruments were Scheimpflug-camera from Bon Sirius and an AS/OCT from Optos. Measurements were taken on central cornea (CCT) and midperipheral (nasal (NCT), temporal (TCT), superior (SCT) and inferior (ICT)) at a distance of 1.75 mm from the apex. Mean age of the subjects was 23.6 ± 4.5 years. (19-44 years). A CT-80A non-contact tonometer (NonCT) from Topcon was used to measure the intraocular pressure (IOP). Results: A mean-value for central corneal thickness was calculated to 542.4 µm and 540.4 µm for Bon Sirius and AS/OCT repectively. Remaining measured points had mean-values for corneal thickness of, NCT: 577.7 µm & 558.5 µm. TCT: 555.0 µm & 545.2 µm. SCT: 585.7 µm & 554.5 µm. ICT: 563.0 µm & 548.9 µm, respectively. Mean-difference for CCT was 2.4 µm and it showed a significant difference between the two instruments with a p-value of 0.007. Remaining measured points all showed a significant difference of p<0.05. NCT: 19.2 µm. TCT: 9.8 µm. SCT: 31 µm. ICT: 14 µm. A correlation between IOP and CCT measured in both Sirius and AS/OCT was positive with r = 0.7 and p<0.05. Conclusion: The results showed that Sirius gives higher values for corneal thickness then ASOCT in all five measurement points. The results show that these instruments can be used interchangeably when measuring central corneal thickness. However, caution should be used when measuring midperipheral corneal thickness as the there is a significant differences between these two instruments.

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Bullmann, Timo [Verfasser]. „Effizienz einer Routine-Untersuchung des Augenhintergrundes von Patienten mit definierten internistischen Erkrankungen mittels einer Ultraweitwinkelkamera (Optos) im Vergleich zur konventionellen Spaltlampenbiomikroskopie in Mydriasis / Timo Bullmann“. Gießen : Universitätsbibliothek, 2021. http://d-nb.info/1230476261/34.

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Berg, Elliott Philip. „High-speed focal plane array camera for mid-infrared impulse photothermal radiometry“. Thesis, London South Bank University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367903.

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Šilkauskaitė, Aušra. „Šunų gastroduodenalinės opos“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140305_135716-36101.

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Pagrindinis darbo tikslas buvo nustatyti ir įvertinti šunų skrandžio ir dvylikapirštės žarnos opų susirgimų dažnumą, priežastis, klinikinių simptomų pasireiškimą, efektyviausius diagnozavimo bei gydymo metodus. Pasiekti šį tikslą, pirmiausiai mes išanalizavom virškinamojo trakto ligų bei skrandžio ir dvylikapirštės žarnos opų dažnumą. Antra, mes statistiškai isanalizavome labiausiai išreikštus klinikinius simptomus, budingus kraujo morfologinių ir biocheminių rodiklių pakitimus. Galiausiai, nustatėme efektyviausia diagnozavimo metodą bei taikomą gydymą. Nustatėme, kad 2012 metais, 16,66 proc. visų šunų ligų sudarė virškinamojo trakto ligos. Iš šių virškinamojo trakto ligų 3,04 % buvo skrandžio opaligė, tuo tarpu dvylikapirštės žarnos opų nebuvo nustatyta 2012 metais. Labiausiai išreikšti skrandžio ir dvylikapirštės žarnos opų klinikiniai simptomai buvo vėmimas (90,48 % pacientų) ir viduriavimas (57,14 % pacientų). Išanalizavus kraujo morgfologinius tyrimus buvo nustatyta neutrofilija (79,31 ± 0,9875 proc.), tuo tarpu kiti kraujo morfologiniai rodikliai buvo fiziologinėse normos ribose. Išanalizavus kraujo biocheminius tyrimus buvo nustatytas nežymus bilirubino kiekio padidėjimas kraujyje (8,59 ± 0,9549 µmol/l) ir sumažėjęs ALT (67,03 ± 9,7915 U/l). Endoskopinis tyrimas buvo nustatytas kaip efektyviausias diagnozavimo metodas. Naudojant šį metodą buvo diagnozuota 90,47 proc. pacientų. Gydymui dažniausiai buvo naudojama: gastroprotektoriai (90,48 proc.), gastroprokinetikai (80... [toliau žr. visą tekstą]
The main goal of this thesis was to determine and evaluate the frequency, ethiology, clinical symptoms, the most effective diagnostic and treatment methods for gastroduodenal ulcers in dogs. To achieve this goal at first we analized the frequency of gastrointestinal diseases and the frequency of gastroduodenal ulcers in dogs. Secondly, we statistically analized the most expressed clinical symptoms, the characteristic morphological and biochemical abnormalities of blood in dogs with gastroduodenal ulcers. Finally, we determined the most effective diagnostic and treatment methods. We determined that during 2012 years 16,66 % of all dogs diseases were gastrointestinal diseases (3,04% gastric ulcers, duodenal ulcers were not determined). The most expressed clinical symptoms for patients with gastroduodenal ulcers were vomiting (90,48%) and diarrhea (57,14%). Blood morphology showed high percentage of neutrophils (79,31 ± 0,9875 %), other morphological parameters were in physiologically normal range. Blood biochemistry showed little rise in bilirubin (8,59 ± 0,9549 µmol/l), and low ALT (67,03 ± 9,7915 U/l). We determined that the endoscopic method is the most effective method in diagnosing gastroduodenal ulcers. 90,47 % of gastroduodenal ulcers were diagnosed by using the endoscope. The most frequent treatment methods for gastroduodenal ulcers were gastro-protectors (90,48 % patients), gastroprokintetics (80,95 % patients), anti-acids (66,67 % patients), and diet (52,38 %... [to full text]

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Mow-Lowry, Conor. „Opto-mechanical noise cancellation“. View electronic text, 2002. http://eprints.anu.edu.au/documents/disk0/00/00/07/65/index.html.

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Thesis (BSc. (Hons))--Australian National University, 2002.
Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 28, 2003). "A thesis submitted for the degree of Bachelor of Science with Honours in physics at the Australian National University" "November 2002" Bibliography: p. 73-75.

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Kadlec, Kal, und Kal Kadlec. „Parametric Opto-Mechanical Performance Analysis of Mounted Lenses Under Thermal Loading“. Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625904.

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Mounting of lenses in opto-mechanical assemblies can create surface figure errors and refractive index changes through thermal and pre-load stresses. As lenses and barrels change in size under temperature changes, the optical performance degrades due to stress and surface deformations. Currently there is no way of determining the effect of these mechanical perturbations on the system wavefront without performing tedious finite element analysis. Most in-depth opto-mechanical analyses involve case-by-case studies with specific designs while previous general studies fail to take into account the complex geometries. The assumptions made by previous general studies ignore the effects of lens shape. These omissions can have a large effect on the stiffness, stress and surface figure error. A parametric model can combine the best of both an in-depth and general study. By parametrizing the model, a simple analysis can be executed for approximating the environmental-mechanical effects on optical performance. This eliminates the time it takes for an opto-mechanical design to be iterated for an optical or mechanical engineer. This tool could be used for early opto-mechanical design or for finite element analysis verification. The parametric model allows the exploration of the broader design study without confining it to a local design space.

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Edoua, Kacou Charles. „Circuits de photo-réception adaptés très faibles bruits et à grande dynamique“. Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1008/document.

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Ce travail s'inscrit dans le cadre d'un projet commun soutenu par la DGA (procédure RAPID), le projet Récepteur Optique Hyperfréquences LArge Bande ou ROHYLAB, dont VectraWave fait parti. Ce travail de thèse s'inscrit dans le domaine de la radio-sur-fibre en particulier au niveau de la réception. Nous nous inscrivons dans le contexte des photorécepteurs faible bruit, le but étant d'optimiser l'interface optique-électrique de ceux-ci tout en garantissant une grande dynamique. Après avoir présenté les avantages de la radio-sur-fibre à savoir : hauts débits, robustesse et encombrements, nous présentons les photorécepteurs et les différents paramètres qui les caractérisent. Cette étape nous permet de les comparer entre eux en les regroupant en fonction des techniques de conception utilisées dans la littérature. Cette étape nous permet d'identifier la technique de conception à utiliser. Nous choisissons de concevoir photorécepteur bande étroite dont on viendra élargir la bande. Nous définissons ensuite les paramètres nécessaires à la comparaison des technologies entre elles afin de justifier le choix de la technologie de transistor à utiliser. Nous étudions le photorécepteur en tant que système afin de mettre en évidence l'importance des paramètres présentés précédemment sur les performances de celui-ci. De cette analyse nous proposons une méthode de conception bande étroite liant l'ensemble des grandeurs. Nous montrons aussi comment estimer les performances limites en fonction de la technologie utilisée pour la photodiode et celle de l'amplificateur. Aussi nous montrons l'expression de cercles à densité équivalente de courant de bruit constants et de cercles à transimpédance constants. A partir de la modélisation théorique du photorécepteur et l'expression théorique des grandeurs caractéristiques, nous proposons la mise en œuvre et l'utilisation des outils présentés au chapitre précédent avec un logiciel de conception assisté par ordinateur. Nous montrons la modélisation de composants opto-microondes dans un environnement de simulation électrique. A l'aide de ces outils nous concevons trois photorécepteurs faible bruit et à grande dynamique dans la bande 2,9 GHz - 3,4 GHz. Les objectifs fixés sont : 300 de transimpédance, 5 pA/pHz. Ces circuits ont été simulés sous l'environnement électrique ADS mais aussi sous l'environnement électromagnétique MOMEMTUM. Les trois circuits présentent des performances records en bruit à de 3 GHz vis à vis de l'état de l'art. La réalisation du deuxième circuit conçu permet la caractérisation des photorécepteurs dans la bande 2,9 GHz - 3,4 GHz. Nous validons ainsi la démarche et proposons un circuit compétitif vis-à-vis de l'état de l'art. Dans une dernière section de cette thèse, nous illustrons le fait que cette méthode peut être exploitée sur d'autres technologies. Nous mettons en avant aussi le fait que l'on peut envisager la conception de photorécepteurs autour de 20 GHz. Nous envisageons aussi l'utilisation d'une inductance active pour réaliser des photorécepteurs accordables en fréquence pour des fréquences basses
This work is based on a common project support by the DGA, the project ROHYLAB for “wide band opto-microwave receiver” with Vectrawave . This work aim to optimized the optic-electric interface of a receiver in the radio-over-fiber field to design a low noise and high dynamic receiver. After an overview of radio-over-fiber's avantages such as: high data rates, security and security, we presented different photoreceiver and the figure of merit used to caracterized them. This step allow a comparison of the photoreceiver classified by the design topologies used in order to choose which design methodology we will used in this work. In an other hand, the same analysis is done for the transistor technologies. We presented a study of photoreceiver as a system in order to highlight the impact of main caracteritics on its performances. From this analysis allow to show a narrow band design method which link the caracteristics of the photodiode to the transistor's caracteristics. We also present some design tools such as circles of constant equivalent noise current density and circles of constant transimpedance. From the photoreceiver's theoritical model and the expressions of the main caracteristics, we implement the deisgn tools presented in ADS. In this section we also present the opto-microwave components models. Using this tools, we design three photoreceiver with low noise and high dynamics. This photoreceiver's aims to reach 300 Ohms of transimpedance and 5pA/Hz of noise. This circuits are implemented in ADS's eletrical fields and also in MOMENTUM's fields. All of this circuits appears as a competitive one in terms of noise at 3GHz .From the photoreceiver's design, we realized some cicuirts which permit photoreceiver's caracterization in 2.9 GHz - 3.4 GHz bandwidth. This measurements validate our approach and confirm a competitive circuit in term of noise compare to litterature. In a final sectin of this work, we illustrate an extension of this approach on other technologies. We also highlight a design of a photoreceiver at 20 GHz. In the end, we suggest the using of an active inductor to realize switchable frequency photoreceiver in low frequency

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Vila, i. Planas Jordi. „PDMS-based opto uidic systems“. Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/284136.

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Al llarg de la tesis, diversos elements òptics i fluidics s’han aconseguit integrar en sistemes optofluidics completament funcionals. La integració d’aquests s’ha realitzat fent servir la tècnica de soft-lithography i el PDMS com material constituent per garantir el baix cost i la felxibilitat dels sistemes LOC. Els elements desenvolupats s’han caracteritzat individualment i els LOCs s’han testat i caracteritzat com a eines per a l’analisis bioquímic per sobrepassar problemes actuals. Es resalta el diseny, optimització, fabricació i caracterització dels elements optics individuals. Els elements òptics es divideixen en dos grups, passius i actius. Els passius són aquells que no necessiten cap font d’energia externa per funcionar. Primerament, els més simples, i.e., lents col·limadores i estructures d’autoalineament, necessàries per crear estructures més complexes. Aquests elements s’havien publicat prèviament, però l’optimització feta així com el desenvolupament d’estructures auxiliars tot fabricat utilitzant la mateixa tecnologia i sense augmentar el passos necessaris doten els elements d’una gran robustesa i ens permeten crear estructures més complexes. Miralls d’aire i lents s’han combinat per formar divisors de feix. El principal problema dels divisors de feix és la desviació entre la intensitat als canals de sortida. Aquest problema indica que pot haver-hi un desalineament en la posició de les fibres, les lents col·limadores o els miralls d’aire. Utilitzant variacions de la tecnologia MIMIC un nou element òptic passiu s’ha dissenyat, fabricat i caracteritzat. PDMS dopat amb 3 pigments diferents s’ha utilitzat per crear filtres amb stopbands al llarg de l’espectr visible. Finalment, un element actiu, un emissor integrat, s’ha redissenyat utilitzant software de simulació òptica. Els resultats suggereixen que hi ha volums morts dins l’estructura i per tant, es proposa una reducció de tamany i un canvi de forma. La integració de molts d’aquests elements més alguns de fluídics es detalla. Primerament, connectors entre mòduls es dissenyen i testegen. L’emissor redissenyat es manufactura i caracteritza. El seu comportament concorda amb les simulacions i suggereig que encara es podria rediu més el volum. Tots els mòduls es fabriquen de dues repliques de PDMS. Cada mòdul és elàstic i pot ser connectat amb els altres en qualsevol substrat, les connexions entre mòduls no són permanents i es poden fer i desfer sense cap coneixement previ sobre microfluidica o LOC. Per tant, el sistema modular té prou flexibilitat per crear LOC a la carta a investigadors sense els coneixements necessaris per crear-los des de zero. Per provar-ho diversos mòduls s’han unit i utilitzat per determinar la concentració de Cristall violeta. Les lents col·limadores ja reportades s’han integrat monolíticament en un generador de microgotes monodisperses. S’han proposat dues configuracions òptiques per possibilitar les mesures en fluorescència i absorbància de les microgotes. Ambdues s’han testejat i comparat amb el set up previ demostrant resultats equiparables. A més, les configuracions proposades poden detectar gotes no etiquetades, una fet que no era possible amb el set up previ, amb la mateixa precisió i fiabilitat. Malgrat tot, degut a les nostres lents col·limadores i els equips de lectura, la velocitat de detecció de gotes està limitada a 160 gotes/s. Finalment, la determinació del medi interior de la gota s’ha demostrat experimentalment per primer cop en un sistema optofluidic. Finalment, s’ha contruit un FCOR comapcte i integrables utilitzant tècniques de soft-lithography i utilitzant únicament PDMS i aire per assegurar baix cost i robustesa. S’han utilitzat phaseguides per crear un FCOR amb un mirall mòbil sense parts mòbils. Aquest LOC és repetitiu i té una llarga durabilitat (no s’aprecia degradació o baixada de rendiment en tot l’espectre visible durant setmanes). Per últim, FCOR s’ha integrat amb dos LOC reportats amb anterioritat per fer mesures en paral·lel de glucosa i lactat amb una única font de llum. Un cop calibrat el sistema, el FCOR permet la mesura de glucosa i lactat amb coherència amb resultats previs. Validant, per tant, el FCOR per anàlisis en paral·lel.
Along the thesis, several optics and fluidics elements are succesfully integrated in fully functional optouidic systems. Integration of these elements using soft-lithography fabrication technique and PDMS as constituent material ensures low-cost, disposable and flexible LOCs systems. Developed elements are individually characterized and LOCs are characterized and tested as (bio)chemical tools to overcome unsolved issues of the present state of the art in LOC applications. Design, optimization, fabrication and characterization of individual optical elements is outlined. Optical elements have been divided in two categories, passive and active elements. Passive elements are those which do not require an energy source to work. Firstly, the most simple elements, i.e., collimation lenses and self-alignment structures, necessary to create more complex structures. Such elements usually were published previously, but our development and optimization of elements as well as auxiliary structures, e.g., stoppers and self-alignment channels, built using a single technology with no increase of fabrication steps, provide a robust approach to create more complex structures. Air mirrors and lenses are combined to create beam splitters. The major issue of the BS is the deviation of output power between channels. This result suggests that some misalignment in the fibre position, the lens collimation or the waveguide geometry has occurred. Using developed MIMIC variations a new passive optical element are designed, fabricated and characterized. PDMS doped with three different pigments are used to create filters with stopbands along the whole visible spectrum. Finally, an active element, an integrated emitter, is redesigned using TracePro simulation software. Simulation results suggest there are dead volumes inside the emitter chamber. Then, size reduction and shape change is proposed. Integration of many of the these optical plus some fluidic elements is explained. Firstly, different connectors between modules are designed and tested. The previously redesigned integrated emitter are manufactured and characterized. Its behaviour matches with simulations results and suggest a further size reduction is not only possible but also recommendable. All the modules are fabricated from two PDMS replicas. Each module is elastic and can be assembled with other modules in any substrate, modules connections are not permanent and can be plug and unplug with no previous knowledge in microfluidics or LOC. Hence, presented modular system have enough flexibility to create LOC on demand to researchers without the background required to design and manufacture LOC systems from scratch. In order to prove it several modules are tested together in a crystal violet concentration determination. Previously reported collimation lenses are monolithically integrated in a monodisperse microdroplets generator. Two different optical configurations have been proposed in order to make possible fluorescence and absorbance measurement of droplets. Both are tested and compared to previous set up with equivalent results. In addition, proposed configurations can detect unlabelled droplets, a feature that was not possible with the previous set up, with the same precision and reliability. However, due to our collimation lenses and readout equipment, the droplet generation rate is limited to 160 drops/s. Finally, screening of droplet inner medium is experimentally proved for first time in optofluidic system. Afterwards, a compact and integrable fluidically controlled optical router (FCOR) is build using soft-lithographic techniques and made entirely of PDMS and air ensuring low-cost and robustness. Phaseguides, has been exploited to create a FCOR with a movable mirror without mobile parts. The LOC is repetitive, and has a good durability (non appreciable degradation or performance deterioration for weeks, in the whole visible spectrum). Finally, FCOR is integrated in a previously reported LOC performing parallel measurements of glucose and lactate with a single light source. After setup calibration, the FCOR allows parallel measurement of glucose and lactate showing good agreement with previous results. Validating then, the FCOR for parallel analysis.

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Gilchrist, J. R. „Opto-thermal transient emission radiometry“. Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381131.

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Bücher zum Thema "Optos"

Cho, Hyung Suck. Opto-mechatronics. Boca Raton, FL: Taylor&Francis, 2005.

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Limited, Ferranti Electronics. Opto-electronic devices. Chadderton: Ferranti Electronics Ltd, 1985.

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Opos 1991-2000. Milano: Abitare Segesta, 2001.

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Protopopov, Vladimir. Practical Opto-Electronics. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04513-9.

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I͡Akovenko, I͡U I. Pochtovyĭ opros v sot͡siologicheskom issledovanii. Kiev: Nauk. dumka, 1988.

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Futbol optom i v roznit︠s︡u. Moskva: Vagrius, 2006.

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Weideman, George. Die optog van die aftjoppers. Kaapstad: Tafelberg, 1994.

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Yoder, Paul R. Opto-mechanical systems design. New York: M. Dekker, 1986.

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Yoder, Paul R. Opto-mechanical systems design. 3. Aufl. Boca Raton, FL: Taylor&Francis, 2005.

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Yoder, Paul R. Opto-mechanical systems design. 2. Aufl. New York: M. Dekker, 1992.

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Buchteile zum Thema "Optos"

Michelena, M. D. „Commercial Off-The-Shelf GMR Based Sensor on Board Optos Picosatellite“. In Giant Magnetoresistance (GMR) Sensors, 181–210. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37172-1_8.

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Dey, Puja, und Jitendra Nath Roy. „Opto-spintronics“. In Spintronics, 163–84. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0069-2_7.

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Kimel, Alexey V. „Femtosecond Opto-Magnetism“. In Springer Proceedings in Physics, 187–89. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07743-7_59.

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Bassi, Davide, Andrea Boschetti und Mario Scotoni. „Opto-Thermal Spectroscopy“. In Applied Laser Spectroscopy, 215–26. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1342-7_18.

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Aliverti, A., und A. Pedotti. „Opto-electronic Plethysmography“. In Mechanics of Breathing, 47–59. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2916-3_5.

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Luecke, Frank. „Opto-mechanical Parts“. In Handbook of Laser Technology and Applications, 233–38. 2. Aufl. 2nd edition. | Boca Raton : CRC Press, 2021- |: CRC Press, 2021. http://dx.doi.org/10.1201/b21828-15.

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Schmitd, Christian, und Gabi Reinmann. „Qualitätssicherung im optes-Projekt“. In Selbststudium im digitalen Wandel, 289–97. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-31279-4_25.

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Schmidt, Christian, Victoria Marquardt, Gabi Reinmann und Daria Paul. „Evaluation im Projekt optes“. In Selbststudium im digitalen Wandel, 299–306. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-31279-4_26.

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Protopopov, Vladimir. „Optical Elements“. In Practical Opto-Electronics, 1–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04513-9_1.

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Protopopov, Vladimir. „Beam Alignment and Positioning Techniques“. In Practical Opto-Electronics, 309–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04513-9_10.

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Konferenzberichte zum Thema "Optos"

Aragon, V., A. Garcia, R. Amaro, C. Martinez und F. Sarmiento. „OPTOS communications: A high performance solution“. In 2011 IEEE Aerospace Conference. IEEE, 2011. http://dx.doi.org/10.1109/aero.2011.5747358.

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Rivas, J., I. Arruego, A. Martin-Ortega, J. J. Jimenez, J. Martinez-Oter, J. R. de Mingo und B. Martin. „Owls as platform technology in OPTOS satellite“. In International Conference on Space Optics 2016, herausgegeben von Nikos Karafolas, Bruno Cugny und Zoran Sodnik. SPIE, 2017. http://dx.doi.org/10.1117/12.2296165.

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Lauinger, Norbert. „Grating-optical image preprocessing leads optoelectronics into opto2-, opto3-, and optoN electronics“. In Photonics East '99, herausgegeben von David P. Casasent. SPIE, 1999. http://dx.doi.org/10.1117/12.360323.

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Tzou, H. S., und B. J. Liu. „Light-Induced Non-Contact Actuation and Control With Photostrictive Actuators“. In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3930.

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Abstract Non-contact light activated distributed opto-electromechanical actuators represent a new class of precision distributed actuator which are based on the photodeformation process and controlled by high energy lights, e.g., lasers and ultra-violet lights. Fundamental opto-thermo-electromechancial constitutive relations are discussed and formulations of optically induced control forces and moments introduced. Mathematical modeling and analysis of distributed opto-electromechanical shell actuators are presented. A generic distributed photo-actuation theory is proposed and the closed-loop opto-thermo-electromechancial equations of circular cylindrical shells are derived. The systems equations reveal the couplings among elasticity, photodeformation, pyroelectricity, and thermoelasticity. Active distributed control of flexible cylindrical shells using segmented distributed opto-electromechanical shell actuators are investigated and the control effectiveness is evaluated. Membrane and bending control effects are evaluated. Time history analyses of independent modal control reveal that the Lyapunov control is more effective than the proportional feedback control.

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Bakker, Saskia, Panos Markopoulos und Yvonne de Kort. „OPOS“. In the 5th Nordic conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1463160.1463165.

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Kimel, A. V., A. Kirilyuk und Th Rasing. „Femtosecond opto-magnetism“. In 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431810.

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Vahala, Kerry, und Tobias Kippenberg. „Cavity opto-mechanics“. In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4551967.

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„Opto electronic devices“. In 2009 67th Annual Device Research Conference (DRC). IEEE, 2009. http://dx.doi.org/10.1109/drc.2009.5354976.

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Kimel, Alexey V., Andrei Kirilyuk und Theo Rasing. „Femtosecond opto-magnetism“. In Integrated Optoelectronic Devices 2008, herausgegeben von Jin-Joo Song, Kong-Thon Tsen, Markus Betz und Abdulhakem Y. Elezzabi. SPIE, 2008. http://dx.doi.org/10.1117/12.764466.

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Suhir, E. „Thermal Stress Modeling in Micro- and Opto-Electronics: Review and Extension“. In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43777.

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The role and the attributes of, and the challenges in, predictive modeling of thermal stresses, strains and displacements in micro- and opto-electronic packaging are addressed. Merits, shortcomings and interaction of theoretical and experimental approaches are discussed, as well as the role and the interaction of the analytical (“mathematical”) and the numerical (computer-aided, primarily, finite-element) modeling. We briefly review the published work in the field, with an emphasis on the analytical modeling. The review is based, to a great extent, on the author’s work conducted during his eighteen years tenure with Bell Laboratories at Murray Hill, New Jersey. The “extension part” of the article is dedicated to the role that a probabilistic approach might play in understanding and predicting the effects of the variability in materials properties, structural geometry and loading conditions on the thermal stresses, strains and reliability of micro- and opto-electronic assembiles and structures, subjected to thermal loading. The main message of the article is that a viable and reliable micro- or opto-electronic component or device can be successfully created and delivered, as a product, to the market in a timely fashion only provided that predictive modeling, whether analytical or numerical, is widely and effectively employed. Modeling should be conducted in addition and, preferably, prior to the design effort, experimental investigations and accelerated (product development, qualification or life) testing. In this connection, we would like to point out that predictive modeling is also an essential part of the accelerated life testing methodologies and procedures. Another message is that probabilstic approaches could be very helpful in many problems of physical design of micro- and opto-electronic systems subjected to thermal loading.

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Berichte der Organisationen zum Thema "Optos"

Teetarden, Kenneth J., Jr Stroud und Charles R. Optics & Opto-Electronic Systems. Fort Belvoir, VA: Defense Technical Information Center, Juni 1988. http://dx.doi.org/10.21236/ada199570.

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Boyd, Robert W., und G. M. Morris. Optics and Opto-Electronics Systems. Fort Belvoir, VA: Defense Technical Information Center, Juli 1989. http://dx.doi.org/10.21236/ada212340.

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George, Nicholas. Center for Opto-Electronic Systems Research. Fort Belvoir, VA: Defense Technical Information Center, Februar 1988. http://dx.doi.org/10.21236/ada195159.

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Lin, Ting-Ting Y. Fault Tolerance in Opto-Electronic Computing. Fort Belvoir, VA: Defense Technical Information Center, Januar 1992. http://dx.doi.org/10.21236/ada246517.

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Lin, Ting-Ting Y. Fault Tolerance in Opto-electronic Computing. Fort Belvoir, VA: Defense Technical Information Center, April 1994. http://dx.doi.org/10.21236/ada280219.

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Kotovsky, J. A Micro-Opto-Mechanical Photoacoustic Spectrometer. Office of Scientific and Technical Information (OSTI), Oktober 2008. http://dx.doi.org/10.2172/950094.

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Brandelik, Joseph. Nonlinear Optical (NLO) Polymer Opto-Electronic Devices. Fort Belvoir, VA: Defense Technical Information Center, Juli 2000. http://dx.doi.org/10.21236/ada384482.

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Seo, Chung-Seok, und Abhijit Chatterjee. Optically Interconnected Intelligent RAM Multiprocessors (OPTO-IRAM). Fort Belvoir, VA: Defense Technical Information Center, Oktober 2004. http://dx.doi.org/10.21236/ada428066.

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George, Nicholas. Center for Opto-Electronic Systems Research Instrumentation Grant. Fort Belvoir, VA: Defense Technical Information Center, Februar 1988. http://dx.doi.org/10.21236/ada193711.

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Talin, Albert Alec, Reese E. Jones, Dan Catalin Spataru, Francois Leonard Leonard, Yuping He, Michael E. Foster, Mark D. Allendorf, Vitalie Stavila und Patrick E. Hopkins. Molecule@MOF: A New Class of Opto-electronic Materials. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1395437.

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