Relevant bibliographies by topics / THz filter

Academic literature on the topic 'THz filter'

Author: Grafiati
Published: 10 December 2022
Last updated: 30 January 2023

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Journal articles on the topic "THz filter"

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Zhang, Xiao Yu, Zhong Xin Zheng, Xin Xing Li, Ren Bing Tan, Zhi Peng Zhang, Yu Zhou, Jian Dong Sun, Bao Shun Zhang, and Hua Qin. "Terahertz Filter Based on Frequency Selective Surfaces." Advanced Materials Research 571 (September 2012): 362–66. http://dx.doi.org/10.4028/www.scientific.net/amr.571.362.

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Terahertz filters based on the frequency selective surfaces (FSS) structure have been modeled and fabricated on the sapphire substrate. The terahertz (THz) transmission properties are investigated using a THz time-domain spectroscopy (THz-TDS) system. The designed two FSS-based THz filters exhibit the THz electromagnetic wave transmission and reflection characteristics, respectively, showing about 70% change of THz transmission at the frequency of 1.3 THz. It is suggested that the THz filtering effect results from the resonance behavior between THz plane-wave and resonant elements of designed metallic FSS structures. The agreement between experiments and simulations indicate that the designed THz filter show a great potential application for high-speed THz modulator.
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Pavia, João Pedro, Nuno Souto, and Marco Alexandre Ribeiro. "Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices." Photonics 7, no. 3 (July 10, 2020): 48. http://dx.doi.org/10.3390/photonics7030048.

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A study on the design, simulation and characterization of a reconfigurable terahertz (THz) filter, composed of two frequency-selective surfaces (FSSs) with applications on sensor devices in general and highly sensitive stress sensors, is presented in this paper. Using the developed theoretical model, we found out that by careful tuning the wire parameters, it is possible to control the filter sensitivity and also the energy transmission and reflection that passes through the structure. Numerical modelling of both the mechanical and electromagnetic components (using the elasticity equation and Maxwell’s equations, respectively) has been undertaken for two types of the device assemblies based on different thermoplastic polymers transparent to the THz radiation, namely: high-density polyethylene (HDPE) and polytetrafluoroethylene (PTFE), operating in a THz window from 395 to 455 GHz. The numerical results allowed us to characterize the relation between the reflectance/transmittance and the amount of force required to obtain a specific frequency shift along that window. It was found that the device assembled with HDPE presents a more linear response and it is able to pass from a full transparency to almost full opacity using only its linear operating zone. Due to its characteristics, this THz filter might be an interesting solution not only for THz sensors based on reconfigurable filters but also for optical modulators for the THz domain.
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Huang, Ying, Taiyu Okatani, and Yoshiaki Kanamori. "Broadband stop filters for THz waves using H-shaped metamaterials with dual electronic-plasmonic functionality." Japanese Journal of Applied Physics 61, SD (March 24, 2022): SD1007. http://dx.doi.org/10.35848/1347-4065/ac55dd.

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Abstract Terahertz (THz) waves have attracted extensive attention recently owing to their spectral specificity and transmission properties. For developing THz technologies, filters are significant devices because they can manipulate waves transmission. Metamaterials (MMs) possess unique optical characteristics that are not available in natural materials, have been developed for THz filters. However, reported MMs with separated units only excite plasmonic resonances, which limits their application. Here, broadband stop filters based on H-shaped MMs (H-MMs) for THz waves were proposed. The H-MM has two continuous metallic arms that can flow the electric current, allowing it to benefit electronic applications meanwhile keeping the plasmonic characteristics. A stopband with a central frequency of 0.65 THz and a −10 dB bandwidth of 458 GHz was experimentally demonstrated. Moreover, this filter can freely tune its bandwidth and central frequency by designing its geometry, which provides it with potential in wide THz applications such as THz communications.
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Zhai, Dongwei, Yuping Yang, Zhaoxin Geng, Bin Cui, and Rong Zhao. "A High-Selectivity THz Filter Based on a Flexible Polyimide Film." IEEE Transactions on Terahertz Science and Technology 8, no. 6 (November 2018): 719–24. http://dx.doi.org/10.1109/tthz.2018.2872414.

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Wang, Fengjuan, Vasilis F. Pavlidis, and Ningmei Yu. "Miniaturized SIW Bandpass Filter Based on TSV Technology for THz Applications." IEEE Transactions on Terahertz Science and Technology 10, no. 4 (July 2020): 423–26. http://dx.doi.org/10.1109/tthz.2020.2974091.

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Shipilo, Daniil E., Nikolay A. Panov, Irina A. Nikolaeva, Alexander A. Ushakov, Pavel A. Chizhov, Kseniia A. Mamaeva, Vladimir V. Bukin, Sergey V. Garnov, and Olga G. Kosareva. "Low-Frequency Content of THz Emission from Two-Color Femtosecond Filament." Photonics 9, no. 1 (December 29, 2021): 17. http://dx.doi.org/10.3390/photonics9010017.

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We experimentally investigate the low-frequency (below 1 THz) spectral content of broadband terahertz (THz) emission from two-color femtosecond filament formed by the 2.7-mJ, 40-fs, 800+400-nm pulse focused into air. For incoherent detection, we screened the Golay cell by the bandpass filters and measured the THz angular distributions at the selected frequencies ν=0.5, 1, 2 and 3 THz. The measured distributions of THz fluence were integrated over the forward hemisphere taking into account the transmittance of the filters, thus providing the estimation of spectral power at the frequencies studied. The spectral power decreases monotonically with the frequency increasing from 0.5 to 3 THz, thus showing that the maximum of THz spectrum is attained at ν≤0.5 THz. The THz waveform measured by electro-optical sampling (EOS) based on ZnTe crystal and transformed into the spectral domain shows that there exists the local maximum of the THz spectral power at ν≈1 THz. This disagrees with monotonic decrease of THz spectral power obtained from the filter-based measurements. We have introduced the correction to the spectral power reconstructed from EOS measurements. This correction takes into account different focal spot size for different THz frequencies contained in the broadband electromagnetic pulse. The corrected EOS spectral power is in semi-quantitative agreement with the one measured by a set of filters.
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Liu, Chuqing, Jiasheng Ye, and Yan Zhang. "Thermally tunable THz filter made of semiconductors." Optics Communications 283, no. 6 (March 2010): 865–68. http://dx.doi.org/10.1016/j.optcom.2009.11.019.

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Liu, Shuang, Jiang Hu, Yong Zhang, Zhongwan Zheng, Yupeng Liu, Ruimin Xu, and Quan Xue. "1 THz Micromachined Waveguide Band-Pass Filter." Journal of Infrared, Millimeter, and Terahertz Waves 37, no. 5 (December 1, 2015): 435–47. http://dx.doi.org/10.1007/s10762-015-0229-6.

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Liu, Jianjun, and Zhi Hong. "Mechanically tunable dual frequency THz metamaterial filter." Optics Communications 426 (November 2018): 598–601. http://dx.doi.org/10.1016/j.optcom.2018.06.019.

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Wang, Jingjing, Kai Guo, and Zhongyi Guo. "THz filter based on the Si microdisk array." AIP Advances 9, no. 4 (April 2019): 045106. http://dx.doi.org/10.1063/1.5083004.

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Dissertations / Theses on the topic "THz filter"

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Bui, Van Bien. "La stabilité du filtre non-linéaire en temps continu." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4002/document.

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Le problème de filtrage consiste à estimer l'état d'un système dynamique, appelé signal qui est souvent un processus markovien, à partir d'observation bruitées des états passés du système. Dans ce mémoire, nous considérons un modèle de filtrage en temps continu pour le processus de diffusion. Le but est d'étudier la stabilité du filtre optimal par rapport à sa condition initiale au-delà de l'hypothèse de mélange (fort) pour le noyau de transition en ignorant l'ergodicité du signal
The filtering problem consists of estimating the state of a dynamic, called signal which is often a Markov process, from the noisy observation of the past states. In this thesis, we consider a filtering model in continuous time for the diffusion process. The aim is to study the stability of the optimal filter with respect to its initial condition beyond the mixing (or quasi – mixing) hypothesis for the transition kernel
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Morzfeld, Matthias, Daniel Hodyss, and Chris Snyder. "What the collapse of the ensemble Kalman filter tells us about particle filters." TAYLOR & FRANCIS LTD, 2017. http://hdl.handle.net/10150/623125.

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The ensemble Kalman filter (EnKF) is a reliable data assimilation tool for high-dimensional meteorological problems. On the other hand, the EnKF can be interpreted as a particle filter, and particle filters (PF) collapse in high-dimensional problems. We explain that these seemingly contradictory statements offer insights about how PF function in certain high-dimensional problems, and in particular support recent efforts in meteorology to 'localize' particle filters, i.e. to restrict the influence of an observation to its neighbourhood.
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Law, Ying Man. "Iterative algorithms for the constrained design of filters and filter banks /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20LAW.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 108-111). Also available in electronic version. Access restricted to campus users.
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Ravet, Alexandre. "Introducing contextual awareness within the state estimation process : Bayes filters with context-dependent time-heterogeneous distributions." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0045/document.

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Ces travaux se focalisent sur une problématique fondamentale de la robotique autonome: l'estimation d'état. En effet, la plupart des approches actuelles permettant à un robot autonome de réaliser une tâche requièrent tout d'abord l'extraction d'une information d'état à partir de mesures capteurs bruitées. Ce vecteur d'état contient un ensemble de variables caractérisant le système à un instant t, comme la position du robot, sa vitesse, etc. En robotique comme dans de nombreux autres domaines, le filtrage bayésien est devenu la solution la plus populaire pour estimer l'état d'un système de façon robuste et à haute fréquence. Le succès du filtrage bayésien réside dans sa relative simplicité, que ce soit dans la mise en oeuvre des équations récursives de filtrage, ou encore dans la représentation simplifiée et intuitive du système au travers du modèle de Markov caché d'ordre 1. Généralement, un filtre bayésien repose sur une description minimaliste de l'état du système. Cette représentation simplifiée permet de conserver un temps d'exécution réduit, mais est également la conséquence de notre compréhension partielle du fonctionnement du système physique. Tous les aspects inconnus ou non modélisés du système sont ensuite représentés de façon globale par l'adjonction de composantes de bruit. Si ces composantes de bruit constituent une représentation simple et unifiée des aspects non modélisés du système, il reste néanmoins difficile de trouver des paramètres de bruit qui sont pertinents dans tous les contextes. En effet, à l'opposé de ce principe de modélisation, la problématique de navigation autonome pose le problème de la multiplicité d'environnements différents pour lesquels il est nécessaire de s'adapter intelligemment. Cette problématique nous amène donc à réviser la modélisation des aspects inconnus du systèmes sous forme de bruits stationnaires, et requiert l'introduction d'une information de contexte au sein du processus de filtrage. Dans ce cadre, ces travaux se focalisent spécifiquement sur l'amélioration du modèle état-observation sous-jacent au filtre bayésien afin de le doter de capacités d'adaptation vis-à-vis des perturbations contextuelles modifiant les performances capteurs. L'objectif principal est donc ici de trouver l'équilibre entre complexité du modèle et modélisation précise des phénomènes physiques représentés au travers d'une information de contexte. Nous établissons cet équilibre en modifiant le modèle état-observation afin de compenser les hypothèses simplistes de bruit stationnaire tout en continuant de bénéficier du faible temps de calcul requis par les équations récursives. Dans un premier temps, nous définissons une information de contexte basée sur un ensemble de mesures capteurs brutes, sans chercher à identifier précisément la typologie réelle de contextes de navigation. Toujours au sein du formalisme bayésien, nous exploitons des méthodes d'apprentissage statistique pour identifier une distribution d'observation non stationnaire et dépendante du contexte. cette distribution repose sur l'introduction de deux nouvelles composantes: un modèle destiné à prédire le bruit d'observation pour chaque capteur, et un modèle permettant de sélectionner un sous-ensemble de mesures à chaque itération du filtre. Nos investigations concernent également l'impact des méthodes d'apprentissage: dans le contexte historique du filtrage bayésien, le modèle état-observation est traditionnellement appris de manière générative, c'est à dire de manière à expliquer au mieux les paires état-observation contenues dans les données d'apprentissage. Cette méthode est ici remise en cause puisque, bien que fondamentalement génératif, le modèle état-observation est uniquement exploité au travers des équations de filtrage, et ses capacités génératives ne sont donc jamais utilisées[...]
Prevalent approaches for endowing robots with autonomous navigation capabilities require the estimation of a system state representation based on sensor noisy information. This system state usually depicts a set of dynamic variables such as the position, velocity and orientation required for the robot to achieve a task. In robotics, and in many other contexts, research efforts on state estimation converged towards the popular Bayes filter. The primary reason for the success of Bayes filtering is its simplicity, from the mathematical tools required by the recursive filtering equations, to the light and intuitive system representation provided by the underlying Hidden Markov Model. Recursive filtering also provides the most common and reliable method for real-time state estimation thanks to its computational efficiency. To keep low computational complexity, but also because real physical systems are not perfectly understood, and hence never faithfully represented by a model, Bayes filters usually rely on a minimum system state representation. Any unmodeled or unknown aspect of the system is then encompassed within additional noise terms. On the other hand, autonomous navigation requires robustness and adaptation capabilities regarding changing environments. This creates the need for introducing contextual awareness within the filtering process. In this thesis, we specifically focus on enhancing state estimation models for dealing with context-dependent sensor performance alterations. The issue is then to establish a practical balance between computational complexity and realistic modelling of the system through the introduction of contextual information. We investigate on achieving this balance by extending the classical Bayes filter in order to compensate for the optimistic assumptions made by modeling the system through time-homogeneous distributions, while still benefiting from the recursive filtering computational efficiency. Based on raw data provided by a set of sensors and any relevant information, we start by introducing a new context variable, while never trying to characterize a concrete context typology. Within the Bayesian framework, machine learning techniques are then used in order to automatically define a context-dependent time-heterogeneous observation distribution by introducing two additional models: a model providing observation noise predictions and a model providing observation selection rules.The investigation also concerns the impact of the training method we choose. In the context of Bayesian filtering, the model we exploit is usually trained in the generative manner. Thus, optimal parameters are those that allow the model to explain at best the data observed in the training set. On the other hand, discriminative training can implicitly help in compensating for mismodeled aspects of the system, by optimizing the model parameters with respect to the ultimate system performance, the estimate accuracy. Going deeper in the discussion, we also analyse how the training method changes the meaning of the model, and how we can properly exploit this property. Throughout the manuscript, results obtained with simulated and representative real data are presented and analysed
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Bourrous, Soleiman. "Étude du colmatage des filtres THE plans et à petits plis par des agrégats de nanoparticules simulant un aérosol de combustion." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0301/document.

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Dans les installations nucléaires, les particules en suspension sont le vecteur d’une grande partie de la contamination radiologique. Pour cette raison, l'IRSN (Institut de Radioprotection et de Sûreté Nucléaire) étudie les filtres THE (Très Haute Efficacité) plissés qui sont l'un des dispositifs permettant assurer la sécurité de l'exploitation nucléaire. Pour éviter les rejets dans l'environnement, la compréhension du comportement des filtres en particulier dans la situation accidentelle doit être aussi exhaustive que possible. L'accident le plus probable et le plus pénalisant pour les dispositifs de confinement est l’incendie qui conduit à une production massive de particules de suie. Dans ce cas, le colmatage des filtres est un problème qui doit être pris en compte. Jusqu'à présent, une corrélation empirique a été développée pour prédire l'augmentation de perte de charge. Toutefois, le caractère empirique de cette corrélation ne permet pas son utilisation dans toutes les situations. Une compréhension phénoménologique et un modèle de colmatage est alors nécessaire. Le travail de thèse qui suit vise à lier l'évolution de la perte de charge à des observations physiques pour chaque étape du colmatage. Pour ce faire, l'étude a été divisée en deux parties. La première se focalise sur le comportement du filtre plan en mesurant la pénétration de particules à l'intérieur du medium et la porosité du dépôt formé sur sa surface. La deuxième partie consiste en une expérience à petite échelle basée sur un seul pli. L'accumulation de particules à l'intérieur du pli a été directement observée, de plus, la déformation du pli ainsi que les écoulements d'air dans le pli (en utilisant une méthode de PIV) ont été mesurés. Au cours de ces expériences, la perte de charge a été mesurée et les paramètres mesurés ont été liés à l'évolution de la perte de charge. La finalité est de construire un modèle analytique simple afin de prédire l'évolution de la perte de charge des filtres en fonction de la masse déposée, des caractéristiques de l'aérosol et des conditions aérauliques. La principale perspective ouverte par ces résultats est la validation des modèles numériques complets pour surmonter les limites expérimentales. Le prolongement logique de ce travail sera l'étude du comportement d'un filtre colmaté soumis à des contraintes de température, d’humidité et aux agressions chimiques de produits de combustion
In nuclear facilities, airborne particles are the vector of most of the radiological contamination. For this reason, pleated HEPA filters are one of the containment devices which are actively studied by the IRSN (Institut de Radioprotection et de Sûreté Nucléaire) to ensure the safety of nuclear exploitation. To avoid contamination of the environment, the understanding of the behavior of the filters especially in accidental situation has to be as exhaustive as possible. The most probable accident and the most penalizing for the containment devices is fire which leads to a massive soot particle production. In this case, the clogging of the filters is a problematic which has to be taken into account. Up to now, an empirical correlation has been developed to predict the pressure drop increase. The empirical nature of this correlation doesn’t allow its use in all situations. A phenomenological understanding and model of the clogging is then necessary. The following PhD work aims to reduce the pressure drop evolution to physical observations for each step of the clogging in order to model it on the most physical basis as possible. To do so, the study has been divided in two parts. The first one focusing on the behavior of flat filter by measuring the penetration of particles inside the medium and the porosity of the deposit formed on its surface. In the second part a small scale experiment based on a single pleat has been developed. Accumulation of the particles inside the pleat has been directly observed, deformation of the pleat as well as airflow in the pleat (using a PIV method) has been measured. During these experiments, pressure drop has been monitored and the measured parameters have been linked to the pressure drop evolution. Finality is to build a simple analytical model to predict the pressure drop evolution of the filters as a function of the deposited mass, the aerosol characteristics and the ventilation conditions. The main perspective opened by these results is the validation of complete numerical models to overcome the experimental limits. The logical extension of this work will be the study of the interaction of a clogged filter with temperature, air moisture and chemical aggression
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Iyer, Naresh Sundaram. "A Family of Dominance Filters for Multiple Criteria Decision Making: Choosing the Right Filter for a Decision Situation." Connect to this title online, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1005939267.

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Thesis (Ph. D.)--Ohio State University, 2001.
Title from first page of PDF file. Document formatted into pages; contains xiv, 169 p.; also contains graphics (some col.). Includes abstract and vita. Advisor: B. Chandresekaran, Dept. of Computer and Information Science. Includes bibliographical references (p. 165-169).
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Boudreau, Chantal. "The transport of radioactive ions in a gas filled radio frequency quadrupole mass filter system /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32979.

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The technique of ion transfer in radio frequency quadrupole (RFQ) systems is described. Computer simulations of the gas filled RFQ mass filter system located at Argonne National Laboratory (ANL) in Argonne, Il. are performed and compared to data obtained from the transfer of radioactive ions produced from the fragmentation of an off-line 252Cf fission source put before the system. The device is used to transport radionuclides created in on-line fusion evaporation reactions from a 150 torr helium filled gas cell to a high vacuum mass spectrometer. Operation parameters and performance results for the gas filled RFQ mass filter system are presented. In addition, the first on-line transfer of a radioisotope resulting in a precise mass measurement using the Canadian Penning Trap (CPT) mass spectrometer is discussed.
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Andersson, Egerlid Axel, and Fredrik Westin. "Design of filter cloth analyser : Development of a portable filter cloth selection tool for filters used to regenerate the acid used in the pickling process during the production of stainless steel." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71474.

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The stainless steel industry is an industry which manufactures one of the most used ma-terials in the world. Even though the vast size of the industry many might not reflect werethe steel comes from when buying their IKEAcutlery etc. But in fact this industry is moreintricate and complex than one might think.During the manufacturing process, the steelgoes through several processes. One of thoseprocesses is done by treating the steel withstrong acid. This chemical process is calledpickling. The pickling process is what createsthe characteristic smooth and shiny surface ofa product made in stainless steel.This thesis is about the development of a testunit that is able to effectively test the ASRA(Acid Sludge Removal Apparatus) filter cloths.The ASRA is a filtration system developed by Scanacon in Stockholm that filtrates and puri-fies acid that is used during the pickling pro-cess of a steel manufacture process. Today, it is complicated, time consuming and dangerous totest and evaluate different filter cloths in orderto find the cloth that provides the best result,since the tests has to be conducted on the realsystems. The aim of this thesis was therefore tosolve these problems. Scanacon wanted to findan alternative solution, that would not includeinteraction with the real filtration system. Theyalso wanted a portable and safe solution. To solve the problem a iterative design pro-cess called RDCD which stands for research, design, create & delivery was developed. Theprocesses was heavily influenced by the CDIO process (Conceive, Design, Implement & Ope-rate). After the research phase was conducted it was decided that a small filter analysis productwould be the best way to solve the problem. The product was then developed one com-ponent at a time. During the project several prototypes and test was created and conductedin order to validate the design.The result is a small filtration unit speciallydesigned to simulate the ASRA system. Theproduct is able to rapidly test various filtercloths in an easy way, without putting the user in harm’s way. After the tests has been perfor-med can the user can identify which cloth that worked the best. The product is small enoughto be possible to be carried in a hard case bag,which in turn affords portability.
Stålindustrin är en industri som tillverkar ettav de mest använda materialen i världen. Trotsindustrins enorma storlek är det kanske intemånga som reflekterar varifrån stålet kommerifrån när man köper exempelvis IKEA bestick.Men faktum är att den här industrin är mycketmer invecklad och komplex än vad man kan tro. Under tillverkningsprocessen går stålet ige-nom flera processer. En av de här processerna genomförs genom att behandla stålet med starksyra. Den kemiska processen kallas för betningoch är det som ger en produkt tillverkad i stålden karaktäristiska lena och glänsande ytan. Den här examensrapporten handlar om ut-vecklandet av en test enhet som effektivt kan testa filter dukarna till ASRA (Acid SludgeRemoval Apparatus) systemet. ASRA systemetär ett filtreringssystem utvecklat av Scanaconi Stockholm som filtrerar och renar syran som används under betningsprocessen vid stål-tillverkning. Idag är det komplicerat, tidskrä-vande och farligt att testa och utvärdera olika filterdukar för att ta reda på vilken duk somger bäst resultat, eftersom att testerna måstegenomföras på de riktiga systemen. Målet fördet här examensarbetet var därför att lösa dehär problemen. Scanacon ville ha en alternativlösning som inte kräver interaktion med deriktiga systemen. De ville också ha en portabeloch säker lösning. För att lösa problemet utvecklades en itera-tiv designprocess kallad RDCD som står för research, design, create & delivery. Processen var tungt influerat av CDIO (Conceive, De-sign, Implement & Operate) processen. Efter att researchfasen var genomförd bestämdesdet att en liten filteranalysatorprodukt var detbästa sättet att lösa problemet på. Produktenutvecklades sedan en komponent i taget. Underprojektets gång har flera prototyper byggts och flera tester genomförts för att validera designen. Resultatet är en liten filtreringsenhet som är specialdesignad för att simulera ASRA syste-met. Produkten kan snabbt testa oliak filterdu-kar på ett enkelt sätt, utan utsätta användaren för fara. Efter att testerna genomförts kananvändaren identifiera vilken duk som funkatbäst. Produkten är tillräckligt liten för att fåplats i en hårdplast väska, vilket ger produktenden efterfrågade portabiliteten.
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Kruger, Abraham J. "The impact of filter loading on residential hvac performance." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50344.

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Buildings are the primary user of energy in the USA. Within homes, the heating, ventilation, and air condition (HVAC) system is the largest energy consumer. This study: (i) developed a new methodology for simulating filter loading in-situ; (ii) observed the impact of filter loading on AC performance in-situ; and (iii) provided a greater understanding of when a filter is “dirty” and should be replaced. Six central AC systems in the Atlanta metro-region were evaluated. Filter loading was simulated by installing the TrueFlow® airflow metering device and partially taping off the face at 3 different increments. This resulted in measurements at 5 discrete static pressures (no filter, TrueFlow, TrueFlow Taped one, TrueFlow Taped two, and TrueFlow Taped three). The pilot study found that as filter pressure drop increased, airflow rates generally decreased, resulting in higher differences in temperature across the evaporator coil (∆T). There was no observed correlation between absolute humidity across the evaporator coil and either filter pressure drop or system airflow. Overall, as airflow decreased so did sensible, latent, and total capacity. This research can inform decisions about filter replacement and be used to evaluate computer simulation models of HVAC performance.
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Zubi, Hazem. "Lowpass Broadband Harmonic Filter Design." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606587/index.pdf.

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In this thesis an analytical design method of the improved broadband passive harmonic filter (IBF) for three phase diode rectifier front-end type adjustable speed drives is presented. The method is based on frequency domain modeling of the rectifier and filter. The success of the method involves accurate representation of the load harmonics. With the harmonics well defined, the harmonic and fundamental frequency equivalent circuits are utilized to analytically calculate the voltages/currents. Thus, the size and the performance of the filter can be optimized. The analytical method is verified via computer simulations and laboratory experiments. Also a performance comparison of various passive harmonic filters for three-phase diode rectifier front-end type adjustable speed drives is provided. The comparison involves the input current total harmonic distortion, input power factor, rectifier voltage regulation, energy efficiency, size, and cost. The parallel/series harmonic resonance problem related issues are addressed and unbalanced operation performance investigated. The comparison is based on analysis and computer simulations and the results are validated by laboratory experiments.
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Books on the topic "THz filter"

1

Tracking filter engineering: The Gauss-Newton and polynomial filters. London: Institution of Engineering and Technology, 2013.

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Vandenbyllaardt, L. J. Performance characteristics of four biological filters and the development of a filter sizing procedure. Winnipeg, Man: Central and Arctic Region, Dept. of Fisheries and Oceans, 1992.

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Blandford, Richard K. The digital filter analyzer. Reading, Mass: Addison-Wesley, 1988.

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Gaver, Donald Paul. Robustifying the Kalman filter. Monterey, Calif: Naval Postgraduate School, 1987.

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Christiano, Lawrence J. The band pass filter. Cambridge, MA: National Bureau of Economic Research, 1999.

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Wells, Curt. The Kalman filter in finance. Dordrecht [Netherlands]: Kluwer Academic Publishers, 1996.

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Wells, Curt. The Kalman Filter in Finance. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8611-5.

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Robert, Powell. Ken Yeang: Rethingking the environmental filter. Singapore: Landmark Books, 1989.

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Data assimilation: The ensemble Kalman filter. Berlin: Springer, 2007.

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Lin, Dennis K. J. Handling spuriosity in the Kalman filter. Toronto, Ont: University of Toronto, Dept. of Statistics, 1992.

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Book chapters on the topic "THz filter"

1

Deyasi, Arpan, and Angsuman Sarkar. "THz Bandpass Filter Design Using Metamaterial-Based Defected 1D Photonic Crystal Structure." In Emerging Trends in Terahertz Solid-State Physics and Devices, 1–21. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3235-1_1.

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Keller, Reto B. "Filtering." In Design for Electromagnetic Compatibility--In a Nutshell, 245–63. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_15.

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AbstractIn EMC, filtering helps to minimize emissions of a product and increase the product’s immunity against electromagnetic interference. This chapter presents the concepts of determining the right filter type and ensuring the proper components are chosen regarding power dissipation, noise current type, and high-frequency behavior.Filters can be classified according to their attenuation in the frequency-domain: Low-pass filters High-pass filters Band-pass filters Band-stop filters or according to active components involved or not: Passive filters Active filters or according to the noise current type: Differential-mode noise filters Common-mode noise filters or according to the suppression of transients: ESD filters Burst filters Surge filters or according to the implementation in hardware or software: Analog filters (hardware) Digital filters (software) In this chapter, all the filter types listed above are explained in further detail.
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Deyasi, Arpan, and Angsuman Sarkar. "Performance Estimation of Defected Ternary Photonic Crystal-Based Bandpass Filter Beyond 100 THz for All-Optical Circuit." In Emerging Trends in Terahertz Engineering and System Technologies, 31–47. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9766-4_3.

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Myrseth, I., and H. Omre. "The Ensemble Kalman Filter and Related Filters." In Large-Scale Inverse Problems and Quantification of Uncertainty, 217–46. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470685853.ch11.

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Evensen, Geir, Femke C. Vossepoel, and Peter Jan van Leeuwen. "A Kalman Filter with the Roessler Model." In Springer Textbooks in Earth Sciences, Geography and Environment, 131–38. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96709-3_12.

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AbstractIn this chapter, we discuss an application of the Kalman filter on simple systems to study its behavior in linear and nonlinear situations. We will use the Roessler model, which we can configure both as a linear and nonlinear system. We start with the linear system, for which the Kalman filter provides an exact and optimal solution, and then study the extended Kalman filter’s performance in the nonlinear system.
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Neckels, Kai. "Wavelet Filter Design via Linear Independent Basic Filters." In Algebraic Frames for the Perception-Action Cycle, 251–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/10722492_19.

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Keller, Reto B. "Components." In Design for Electromagnetic Compatibility--In a Nutshell, 145–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_11.

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AbstractIn order to choose the right components for EMI filters, it is essential to understand the properties and nonideal behavior of passive filter components. Therefore, in this chapter, the high-frequency behavior and other undesirable effects of conductors (wires, cables, PCB traces), resistors, capacitors, inductors, ferrite beads, common-mode chokes, baluns, varistors, and TVS diodes are presented.
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Luque Quispe, Jaime J., and Luís G. Pedroso Meloni. "Pulse Shaping Filter Design for Filtered OFDM Transceivers." In Proceedings of the 3rd Brazilian Technology Symposium, 131–43. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93112-8_15.

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Shirokova, Galina. "CASE 4: Big Filter: Russian Filters in the International Market." In Entrepreneurial Icebreakers, 155–78. London: Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137446329_10.

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Waters, Allan. "The Operational Amplifier." In Active Filter Design, 27–38. London: Macmillan Education UK, 1991. http://dx.doi.org/10.1007/978-1-349-21311-5_3.

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Conference papers on the topic "THz filter"

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Sun, Han, and Yaxin Zhang. "Terahertz Asymmetric Coplanar Waveguide Filter." In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018). IEEE, 2018. http://dx.doi.org/10.1109/irmmw-thz.2018.8510351.

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Li, Jining, and Shengjiang Chang. "Alternative-frequency-selected terahertz bandstop filter." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956236.

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Champagne, J., S. Dupont, J. Gazalet, and J. C. Kastelik. "Tunable filter design for IR hyperspectral imaging." In 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2019. http://dx.doi.org/10.1109/irmmw-thz.2019.8874428.

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Ferraro, A., A. A. Tanga, D. C. Zografopoulos, G. C. Messina, M. Ortolani, and R. Beccherelli. "Terahertz filter with flat-top transmission response." In 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2019. http://dx.doi.org/10.1109/irmmw-thz.2019.8874484.

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Sushko, O., R. Dubrovka, and R. S. Donnan. "Interpretive modeling of THz response of biomolecules as filter circuits." In 2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2012). IEEE, 2012. http://dx.doi.org/10.1109/irmmw-thz.2012.6380335.

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Paulsen, Andrew, and Ajay Nahata. "Anisotropic THz plasmonic filter created using K-space design technique." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956045.

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So, J. K., M. A. Seo, D. S. Kim, J. H. Kim, S. S. Chang, J. H. Son, and G. S. Park. "THz Multi-frequency resonance filter." In 2008 33rd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2008). IEEE, 2008. http://dx.doi.org/10.1109/icimw.2008.4665587.

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Che, George, Sean Bryan, Philip Mauskopf, Matthew Underhill, Hamdi Mani, and Christopher Groppi. "A waveguide filter bank for millimeter-wave spectroscopy." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956112.

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Zhong, Renbin, Yan Liu, Jiebiao Huang, Yilin Lu, and Shenggang Liu. "Metal-Graphene Based Dynamically Tunable Bands Stop Filter." In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018). IEEE, 2018. http://dx.doi.org/10.1109/irmmw-thz.2018.8509842.

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Lan, L. J., B. B. Jin, J. B. Wu, L. Kang, W. W. Xu, J. Chen, and P. H. Wu. "A flexible multi-layer metamaterial for filter and biosensor at THz." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956209.

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Reports on the topic "THz filter"

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Taylor, S., J. Lever, K. Burgess, R. Stroud, D. Brownlee, L. Nittler, A. Bardyn, et al. Sampling interplanetary dust from Antarctic air. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43345.

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We built a collector to filter interplanetary dust particles (IDPs) larger than 5 µm from the clean air at the Amundsen Scott South Pole station. Our sampling strategy used long duration, continuous dry filtering of near-surface air in place of short duration, high-speed impact collection on flags flown in the stratosphere. We filtered ~107 m³ of clean Antarctic air through 20 cm diameter, 3 µm filters coupled to a suction blower of modest power consumption (5–6 kW). Our collector ran continuously for 2 years and yielded 41 filters for analyses. Based on stratospheric concentrations, we predicted that each month’s collection would provide 300–900 IDPs for analysis. We identified 19 extraterrestrial (ET) particles on the 66 cm² of filter examined, which represented ~0.5% of the exposed filter surfaces. The 11 ET particles larger than 5 µm yield about a fifth of the expected flux based on >5 µm stratospheric ET particle flux. Of the 19 ET particles identified, four were chondritic porous IDPs, seven were FeNiS beads, two were FeNi grains, and six were chondritic material with FeNiS components. Most were <10 µm in diameter and none were cluster particles. Additionally, a carbon-rich candidate particle was found to have a small ¹⁵N isotopic enrichment, supporting an ET origin. Many other candidate grains, including chondritic glasses and C-rich particles with Mg and Si and FeS grains, require further analysis to determine if they are ET. The vast majority of exposed filter surfaces remain to be examined.
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Costley, D., Luis De Jesús Díaz,, Sarah McComas, Christopher Simpson, James Johnson, and Mihan McKenna. Multi-objective source scaling experiment. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40824.

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The U.S. Army Engineer Research and Development Center (ERDC) performed an experiment at a site near Vicksburg, MS, during May 2014. Explosive charges were detonated, and the shock and acoustic waves were detected with pressure and infrasound sensors stationed at various distances from the source, i.e., from 3 m to 14.5 km. One objective of the experiment was to investigate the evolution of the shock wave produced by the explosion to the acoustic wavefront detected several kilometers from the detonation site. Another objective was to compare the effectiveness of different wind filter strategies. Toward this end, several sensors were deployed near each other, approximately 8 km from the site of the explosion. These sensors used different types of wind filters, including the different lengths of porous hoses, a bag of rocks, a foam pillow, and no filter. In addition, seismic and acoustic waves produced by the explosions were recorded with seismometers located at various distances from the source. The suitability of these sensors for measuring low-frequency acoustic waves was investigated.
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Domen, Michael, Richard A. Kamin, and Douglas F. Mearns. Evaluation of the Impact of a Synthetic Paraffinic Kerosene and JP-8 Blend on the Filters and Filter/Coalescer Performance. Fort Belvoir, VA: Defense Technical Information Center, August 2009. http://dx.doi.org/10.21236/ada508934.

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Christiano, Lawrence, and Terry Fitzgerald. The Band Pass Filter. Cambridge, MA: National Bureau of Economic Research, July 1999. http://dx.doi.org/10.3386/w7257.

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Abraham J. Fetterman and Nathaniel J. Fisch. The Magnetic Centrifugal Mass Filter. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1062579.

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Lamontagne, M., P. Archambault, and S. Halchuk. Macroseismic information for the seven largest moderate earthquakes of the Charlevoix seismic zone, Quebec, between 1870 and 2021: February 3, 1902, M 4.5; September 30, 1924, M 5.2; January 08, 1931, M 4.9; October 19, 1939, M 5.3; October 14, 1952, M 4.5; August 19, 1979, M 4.8; March 6, 2005, M 4.7. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329135.

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This Open File Report provides the available macroseismic information for the seven largest moderate earthquakes that occurred in the Charlevoix Seismic Zone between 1870 and 2021. These earthquakes and their moment magnitude (M) are: 1) February 3, 1902, M 4.5; 2) September 30, 1924, M 5.2; 3) January 08, 1931, M 4.9; 4) October 19, 1939, M 5.3; 5) October 14, 1952, M 4.5; 6) August 19, 1979, M 4.8; 7) March 6, 2005, M 4.7. Five, possibly six, of these seven earthquakes occurred in the northeast portion of the CSZ, where the largest event of the period, the 1925 M 6.2 earthquake, also occurred. For each locality where the earthquakes were felt, macroseismic information is given and interpreted on the Modified Mercalli Intensity Scale. The original mail questionnaires filled by postmasters for earthquakes no. 3, 4, 5 and 6 are lost. Consequently, the main sources of information are the newspaper accounts except for no. 7 for which web-based questionnaires are available. The macroseismic information from localities in Canada and in the US (from NOAA) are tabulated in Microsoft Excel spreadsheets. Most newspaper clippings that have macroseismic information are included. The Open File also provides Google Earth kmz files that allow the felt information reports to be viewed in a spatial tool.
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Pensado, Osvaldo, George Adams, and Imad Khalek. Technical analysis of filter testing at the U.S. Department of Energy Filter Test Facility. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1834370.

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Podesta, John. Brief Tutorial on the Kalman Filter. Fort Belvoir, VA: Defense Technical Information Center, November 1994. http://dx.doi.org/10.21236/ada286571.

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Waisner, Scott, Victor Medina, Charles Ellison, Jose Mattei-Sosa, John Brasher, Jacob Lalley, and Christopher Griggs. Design, construction, and testing of the PFAS Effluent Treatment System (PETS), a mobile ion exchange–based system for the treatment of per-, poly-fluorinated alkyl substances (PFAS) contaminated water. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43823.

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Poly-,Per-fluorinated alkyl substances (PFAS) are versatile chemicals that were incorporated in a wide range of products. One of their most important use was in aqueous film-forming foams for fighting liquid fuel fires. PFAS compounds have recently been identified as potential environmental contaminants. In the United States there are hundreds of potential military sites with PFAS contamination. The ERDC designed and constructed a mobile treatment system to address small sites (250,000 gallons or less) and as a platform to field test new adsorptive media. The PFAS Effluent Treatment System (PETS) has cartridge filters to remove sediments and a granular activated carbon (GAC) media filter to remove organic compounds that might compete with PFAS in the ion exchange process, although it may also remove PFAS too. The last process is an ion exchange resin specifically designed to remove PFAS to a target level of 70 ng/L or less (equivalent to the US Environmental Protection Agency (EPA) Drinking Water Health Advisory). The system was tested at Hurlburt Field, a US Air Force facility in Florida and at Naval Support Activity (NSA) Mid-South in Millington, TN.
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Litt, R. D., R. C. Glover, and J. K. Raghavan. Advanced development of the nested fiber filter. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10194961.

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