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  • 1990-1994  (2)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Robust improvement in the signal-to-noise of a laser fluorosensor through selectively averaging signals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1877-1879 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Signals acquired with a laser fluorosensor are composed of the fluorescence of the object and noises. The average of n signals theoretically has the signal-to-noise ratio (S/N) which is (square root of)n times higher than the S/N of the single signal, provided that the fluorescence remains constant from signal to signal and that the noises are independent of each other. In practice, the sources of noise in the signals are often correlated with each other, leading to S/N improvement below the theoretical one. In this paper a procedure is proposed and applied in a laser fluorosensor to obtain better S/N. It is shown that the average signal can have better S/N if the signals with the correlated noises are selectively discarded by averaging many signals. This procedure can be advanced for improving S/N of any multi sample averager.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143297
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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
    A new sensor system for airborne measurements of maritime pollution and of hydrographic parameters (1991)
    Springer
    GeoJournal 24 (1991), S. 103-117 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract Since 1986, two Dornier Do 28 D2 aircraft equipped with remote sensing instruments have been flown in the German responsibility areas of the North Sea and the Baltic Sea, aiming at a continuous surveillance of maritime pollution, and at an improved guidance of oil combating operations. Starting in 1991, a new DO 228-212 aircraft will be operated with improved performance. The sensor package will be completed with a new microwave radiometer and a laser fluorosensor, which allow measuring the volume of films on the sea surface, and classifying the substance type. Moreover, parameters which are relevant for the evaluation of ecological conditions as, for example, the occurrence of plankton blooms, can be obtained. The instruments work under control of a new central operator console which performs an in-flight evaluation of the sensor data, and transmission to ships and ground stations via data down link.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213062
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    Paper (German National Licenses)
    Fulltext
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