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  • 1985-1989  (2)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Monitoring humidity by polyimide lightguides (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 778-779 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar waveguides of the commercially available polyimide "PI 2566'' and polyamide-imide "AI lite'' are spin coated on glass substrates. TE and TM polarized modes are launched simultaneously into the phase-matched planar lightguide. This polymer guide is sensitive to changes in its birefringence. Polyimide films in the "as-dried'' and fast cured state turn out to be very sensitive to moisture. Changes in the vicinity of the waveguide can be monitored instantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99281
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Informationserfassung aus Ultraschall-Echogrammen in Zeit-Amplitudendarstellung (1974)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 189 (1974), S. 219-230 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die wesentlichen apparativen Einflußgrößen auf die Information, die Redundanz und den Ballast im Ultraschall-Echogramm werden besprochen, unter besonderer Berücksichtigung von Möglichkeiten zur Gewebsdifferenzierung aus der Zeit-Amplitudendarstellung (TAU, A-Bild). Dabei wird zwischen der konventionellen, visuellen Auswertung der Amplitudenmodulations-Anteile und der zusätzlichen Auswertung von Frequenzmodulation und Phasenlagen mittels maschineller Auswertetechniken unterschieden. Auf letztere bezogen wird ein experimentelles Verfahren zur Informationsanreicherung feinstrukturbedingter und z.T. vermutlich gewebsspezifischer Signalanteile dargestellt. Es werden Beispiele für eine erweiterte Signalerfassung in vitro und rechnerische Weiterbearbeitung der Echogramme gebracht.
    Notes: Summary Factors of the technical equipment influencing essentially the information, the redundance and the ballast in echograms are described, especially considering possibilities for tissue differentiation from time-amplitude-presentation (TAU, A-mode). The conventional evaluation of amplitude-modulation contents by visual means and the additional evaluation of frequency modulation and phase positions by instrumental processing are distinguished. For the latter approach an experimental method for the enhancement of information from small tissue structures is described which may provide improved echogram specifity. Examples are given for an extended in vitro signal acquisition and for signal processing by computer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414783
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An integrated organic photoconductive detector for optoelectronics (1989)
    Springer
    Applied physics 48 (1989), S. 219-224 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 42.82 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the system (poly-(N-vinyl carbazole) (PVK): trinitrofluorenone (TNF) a photoconductive complex is formed. Thin metal films are sputtered on BK7 glass substrates, forming two electrodes with 1 mm separation. The photoconductive complex is deposited from a solution in chlorobenzene/tetrahydrofurane on the glass substrate between the electrodes, forming a photoconductive detector. Photoconductivity of these planar detectors is studied using He-Ne laser light (λ=633 nm) as a function of electric field and for different TNF concentrations. An increase of photosensitivity is found for high TNF concentrations. Time resolution of the photoconductive PVK:TNF detector is investigated using a ruby pulse laser (λ=694 nm). The possible use of such detectors in combination with other polymer lightguides is demonstrated. Compared to most polymer waveguide materials PVK exhibits a rather high refractive index ofn=1.7. Thus the coupling of light into the photoconductive film is achieved directly. The planar structure allows further integration of polymeric components for optoelectronics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694348
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    Paper (German National Licenses)
    Fulltext
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