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  • 1
    Digitale Medien
    Digitale Medien
    Long-path monitoring of atmospheric aerosol extinction with an automated laser positioning system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 546-550 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An automated laser-beam positioning system has been developed and applied to long-path (700 m) monitoring of atmospheric aerosols. The system is based on a piezoelectric-driven mirror mount whose vertical and horizontal positioning is precisely controlled so as to maximize the return beam intensity. By optimizing the direction of the transmitted beam every 5–10 min, the change in aerosol extinction can be measured to an accuracy of better than 2×10−5 m−1 without interference from beam displacement due to the temperature change. This positioning method allows one to use relatively small detectors and optical components which are easier to operate and maintain when compared with the previous method for the long-path measurement. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150238
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  • 2
    Digitale Medien
    Digitale Medien
    High pressure rolling-ball viscometer of a corrosion-resistant type (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 871-873 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A high pressure rolling-ball viscometer was designed for use with corrosive solutions such as electrolytes, using a glass inner cell with a glass cylinder and its piston. The viscosities of water and 2.55-m sodium chloride aqueous solution were measured up to 375 MPa at 25 °C with an error of less than ±1%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141456
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  • 3
    Digitale Medien
    Digitale Medien
    High-speed multichannel photon counter for time-resolved laser spectroscopy (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1926-1929 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A versatile, high-speed multichannel counter, which has maximum temporal resolution Δt=30 ns and channel length up to 4095, has been developed for various kinds of time-resolved laser spectroscopic measurements. High speed, large counting capacity, low cost for fabrication, and ease of circuit assembly have been accomplished by introducing both parallel and pipe-line processing. The performance of this system has been verified in the applications to cw laser radar, time-of-flight measurement of molecular beam, and radiative lifetime measurement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138446
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  • 4
    Digitale Medien
    Digitale Medien
    Simultaneous Measurement of Wind and Aerosol Backscattering in the Troposphere by High Spectral Resolution Lidar with Iodine Filter (2000)
    Springer
    Optical review 7 (2000), S. 230-234 
    Details
    ISSN: 1349-9432
    Schlagwort(e): high spectral resolution lidar ; Doppler shift ; iodine vapor filter ; aerosol scattering ; Rayleigh scattering ; wind velocity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We propose a high spectral resolution lidar system which is capable of measuring aerosol backscattering and line-of-sight wind velocity in the troposphere. An iodine vapor filter is used to separate the aerosol and Rayleigh scattering components as well as to discriminate the Doppler shift frequency. The performance of the lidar system is estimated with reasonable parameters. The error of horizontal wind velocity below an altitude of 6 km is less than 0.5 m/s, and accuracy of the aerosol backscattering coefficient is better than 40% below 10 km. This system is particularly suitable for the study of aerosol transportation in the troposphere.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-000-0230-7
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  • 5
    Digitale Medien
    Digitale Medien
    Simultaneous Observation of NO2 Column Density and Aerosol Optical Thickness in Urban Atmosphere (2000)
    Springer
    Optical review 7 (2000), S. 89-94 
    Details
    ISSN: 1349-9432
    Schlagwort(e): NO2 column density ; atmospheric aerosol ; solar spectrum ; sunphotometer
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Ground-based, optical monitoring of the NO2 column density and aerosol optical thickness is described. The instrument consists of a solar radiation spectrometer and a conventional sunphotometer, both mounted on a sun-tracker and operated automatically. From daytime measurements in Chiba during the winter of 1998, variations of NO2 and aerosol are analyzed. Because of the capability of simultaneous, real time measurement, this method is particularly suitable for air pollution studies in city areas.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-000-0089-7
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  • 6
    Digitale Medien
    Digitale Medien
    High Sensitive Detection of Trace Gases Using Optical Heterodyne Method with a High Finesse Intra-Cavity Resonator (1996)
    Springer
    Optical review 3 (1996), S. 243-250 
    Details
    ISSN: 1349-9432
    Schlagwort(e): frequency modulation spectroscopy (FMS) ; Fabry-Perot etalon ; high finesse ; dual frequency modulation (DFM) ; resonance mode ; heterodyne optical measurement ; trace gas concentration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A novel highly sensitive method to detect the concentration of trace gas for environmental purposes is proposed. This method includes the application of frequency modulation for stabilization of laser frequency, together with optical heterodyne measurement. The shift of resonance frequency of the Fabry-Perot cavity resonator is due to the change of refractive index, accompanied by the dispersion effect due to the presence of a target gas (e.g., methane, carbon dioxide or nitrogen dioxide) inside the Fabry-Perot cavity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-996-0243-y
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  • 7
    Digitale Medien
    Digitale Medien
    Signal Penetration into Thick Clouds Studied by Multi-Layer Data Observed with a Micro-Pulse Lidar (2000)
    Springer
    Optical review 7 (2000), S. 95-100 
    Details
    ISSN: 1349-9432
    Schlagwort(e): lidar ; penetration depth ; optical thickness ; multiple scattering ; multi-layer clouds ; Monte Carlo method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Lidar return signals are studied for a micro-pulse lidar under sky conditions with multi-layer clouds. From theoretical considerations on the lidar signal-to-noise ratio, it is estimated that the maximum cloud optical thickness detectable is about 3.7. This result reasonably agrees with the actual multi-layer cloud data obtained from observations in Sukhothai, Thailand. Deviations from theoretical prediction, however, are found for a geometrically thin but dense cloud, and for a moderately concentrated but geometrically thick cloud. The effect of multiple scattering is also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-000-0095-9
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  • 8
    Digitale Medien
    Digitale Medien
    Study of changes in life zone distribution in north-east China by climate–vegetation classification (1998)
    Springer
    Ecological research 13 (1998), S. 355-365 
    Details
    ISSN: 1440-1703
    Schlagwort(e): climate–vegetation classification ; distribution change ; evaporation rate ; life zone ; vegetation zone ; warmth index
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Life zones and their changes in distribution in north-east China were studied based on climate–vegetation relationships. The warmth index (WI) and aridity index (the ratio of evaporation [evaporation rate, ER] to precipitation) were used to represent the site condition. The typical site condition of each vegetation type was determined as the classification criterion. The boundaries of the four potential vegetation zones were estimated based on the combinations of WI and ER in relation to vegetation (i.e. cold-temperate conifer forest zone, temperate broad-leaved conifer mixed forest zone, warm-temperate deciduous forest zone, and temperate steppe zone). The distribution changes in vegetation zone caused by human activities were estimated by comparing the potential vegetation with the actual one. The percentage cover of forest has shrunk from about 70% to the present 27%. About 23% of the study area was replaced by agricultural vegetation and industrial use. Nearly half of the region could have been covered by broad-leaved conifer mixed forest which was shrunk to a small area, less than 5% of the region. The broad-leaved deciduous forest zone in the southern part could have occupied about 7% of the area, and had almost no virgin stand.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1440-1703.1998.00275.x
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