Radiometrie micro-onde par correlation : definition d'un nouveau type de micro-capteur thermique PDF Download
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Author: Djamel Allal
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Category :
Languages : fr
Pages : 0
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Author: Djamel Allal
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: Djamel Allal
Publisher:
ISBN:
Category :
Languages : fr
Pages : 200
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Ce nouveau capteur, qui concerne la reconstitution du profil de température le long de lignes de transmission dissipatives, est basé sur le traitement du signal fourni par un corrélateur micro-onde connecté aux deux extrémités du dispositif. Un modèle basé sur le concept d'ondes de bruit a été développé. Il s'applique à des lignes de transmission homogènes et hétérogènes, et conduit à la définition de paramètres de couplage radiométriques normalises, condition nécessaire à l'inversion des signaux. Comme souvent en radiométrie, les problèmes sont mal posés et le rapport signal sur bruit généralement faible. Le traitement doit être mené de façon statistique ; ce travail montre qu'un filtrage de Kalman est bien adapté à ce type de problème. Une partie expérimentale importante et originale traite des lignes discontinues et d'autres lignes de forme plus complexe, notamment en méandre, en vue d'une reconstitution des températures à deux dimensions. Les résultats correspondants sont très généralement en bon accord avec la théorie. Une partie prospective est consacrée à la résolution spatiale et en température du procèdé. Elle valide l'intérêt du procèdé dans la définition d'un micro-capteur thermique incluant des radiomètres en bande centimétrique et millimétrique, capables de conduire à une résolution spatiale de 200 microns.
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Category : Electromagnetism
Languages : en
Pages : 922
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Official journal of the Bioelectromagnetics Society and the European Bioelectromagnetics Association. Also the official bioelectromagnetics journal of the Society for Physical Regulation in Biology and Medicine. Specializes in reporting original data on biological effects and applications of electromagnetic fields that range in frequency from zero hertz (static fields) to the terahertz undulations of visible light. Both experimental and clinical data are of interest to the journal's readers as are theoretical papers or reviews that offer novel insights into or criticism of contemporary concepts and theories of field-body interactions.
Author: E. Francis J. Ring
Publisher: Springer Science & Business Media
ISBN: 1468476971
Category : Science
Languages : en
Pages : 683
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I am delighted to have been invited to Bath for the opening of this Third International Congress of Thermology. The connection between the Congress and the City of Bath is significant. The properties of sunlight have been recognized throughout the centuries. Indeed, many ancient religions were based on the worship of the sun gods. The study of radiant heat was pioneered by Sir William Herschel, whose experiments led him to the study of heat and ultimately of infrared radiation. His son, John, furthered these experiments and formed an image by evaporating alcohol with carbon. In modern technology, infrared radiation plays a vital role in a wide range of applications. Thermal imaging is widely used in the manufacturing industries, especially plastics, glass and paper. The motor industry, for example, employs thermography in the design of windscreens and tire development. Chemical plants and refineries also use it in the important control of expensive energy losses. The communications industry makes extensive use of thermal imaging since overheating and cracks in insulation may cause the unscheduled shut-down of expensive equipment. There is now a special thermal imaging system for the examination of very large scale integrated circuits to help in the development of diagnostic tools for examining circuits which now have features of 1 micron in size, making the conventional method of mechanical probing impossible. This revolution in probing will enable us to maintain the high levels of quality control which are essential in the communications industry.
Author: Philippe Lauer
Publisher:
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Category :
Languages : fr
Pages : 0
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Author: Philippe Lauer
Publisher:
ISBN:
Category :
Languages : fr
Pages : 170
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CE TRAVAIL EST UNE CONTRIBUTION A L'ETUDE DE LA DETECTION COHERENTE DU BRUIT THERMIQUE EN MICROONDE PAR UTILISATION D'UN REDIOMETRE A CORRELATION. IL A POUR BUT LA COMPREHENSION DES PHENOMENES PHYSIQUES ET LA DEFINITION DE NOUVEAUX PROCEDES THERMOMETRIQUES.
Author: G. Bruggmoser
Publisher: Springer
ISBN: 9783540155010
Category : Medical
Languages : en
Pages : 168
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The present challenge in the treatment of tumors is to reduce the number of patients that still die as a result of primary tumors. Today, the percentage of such deaths remains high at 30%, even when all the common therapeutic methods, namely surgery, radiotherapy, and chemotherapy, are applied. In order to reduce this percentage, new types of radiation sources with a higher linear energy transfer have been intro duced, such as neutrons and pions. Fractionation patterns have been modified and radiosensitizers have been applied to in crease biological efficiency. Studies of the combined application of chemotherapy and radiotherapy have been made to find the best therapeutic effect. In the early 1970s biological findings confirmed the effect of hyperthermia on tumor cells. The first clinical studies on hyper thermia treatment demonstrated that it resulted in better local tumor control. Further application of this treatment modality showed that hyperthermia should be used in addition to radio therapy and chemotherapy. Despite these encouraging results, hyperthermia has not been introduced into common clinical use, due primarily to technical problems. There are a number of methods of transferring heat into tumors; however, with regard to physical conditions, an op timum method has not yet been found. One of the reasons is that up to now we have had no reliable method of obtaining thermal mapping of all parts of the human body. Such measurements are required not only for dosimetric purposes but also for the regula tion of a hyperthermic system.
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Category : Telecommunication
Languages : en
Pages : 1526
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ISBN:
Category : Science
Languages : en
Pages : 558
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Category : Aeronautics
Languages : en
Pages : 712
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
