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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1877-1879 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    GeoJournal 24 (1991), S. 103-117 
    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
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