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  • 1995-1999  (2)
  • 1990-1994  (1)
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Erscheinungszeitraum
  • 1995-1999  (2)
  • 1990-1994  (1)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2123-2129 
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We report on the prototype of a new digital multi-time-interval analyzer (MTIA-1) based on a counter/memory architecture. The occurrence of multiple events with respect to a common start can be determined with a timing resolution of 4 ns. Incoming standard TTL or ECL pulses are processed and stored immediately after their detection in a 4096×16 Bit RAM. By virtue of this real-time histogramming concept, data acquisition does not have to be interrupted during signal processing. The maximum repetition rate of events to be processed in real time can be in excess of 20 MHz. The MTIA-1 is designed for repetitive timing applications where multiple time intervals have to be processed with very high speed. The analyzer accepts standard TTL or ECL pulses and has a maximum measurement range of 4096 channels. After the end of an individual multi time interval measurement no additional time consuming postprocessing is needed for data transfer or data analysis. The article gives an overview of the structure of the analyzer and its principle of operation. We further present an example for an application where the MTIA-1 is used in fiberoptic distributed temperature sensing.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied climatology 53 (1996), S. 69-78 
    ISSN: 1434-4483
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Summary This paper is focused on the applicability of remotely sensed data of different platforms to determine spatial variability and distribution of soil mositure on a local scale. A plane agricultural test site of ≈ 2 km2 in Central Europe is the basis for a comparison of simultaneously recorded high resolution (〈0.2 m) thermal infra-red data with C-band microwave data (〈30 m). In situ measurements link the remote sensing data to ground truth. Heterogeneity in landform, soil and vegetative cover are accounted for in a resolution of less than a hectare. Results of this study show that there is no correlation between backscattering coefficients and brightness temperatures over vegetated fields, but brightness temperature indicates a distribution of plant available water in the root zone. Bare fields in dry conditions demand in-situ determination of soil moisture of the top few millimeters to compare remote sensing data to reliable ground truth.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied climatology 53 (1996), S. 59-67 
    ISSN: 1434-4483
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Summary Remote sensing and ground measurements were used to evaluate the homogeneity of the Scots pine plantation of Hartheim and the interactions between the forest and its surroundings during HartX. Remote sensing data contribute to characterization of the Scots pine plantation of Hartheim in terms of surface properties and thermal and biological characteristics of the forest. The surroundings of the main experiment site in the forest has homogenous normalized difference vegetation index, microwave specle and brightness temperatures to all directions for at least 500 m. Local sensible heat flux estimates using satellite measured brightness temperatures andin situ measured wind and air temperatures showed good agreement. On some days during HartX the test area was influenced by advection of dry air from the northern Upper Rhine Valley. Agricultural surroundings close to the forest are influenced by breezes flowing out of the forest during radiative nights with weak large-scale motion.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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