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  • Other Sources  (6)
  • ATOMIC AND MOLECULAR PHYSICS  (4)
  • AIRCRAFT INSTRUMENTATION  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
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  • Other Sources  (6)
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  • 1
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    Cross-calibration between airborne SAR sensors (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: As Synthetic Aperture Radar (SAR) system performance and experience in SAR signature evaluation increase, quantitative analysis becomes more and more important. Such analyses require an absolute radiometric calibration of the complete SAR system. To keep the expenditure on calibration of future multichannel and multisensor remote sensing systems (e.g., X-SAR/SIR-C) within a tolerable level, data from different tracks and different sensors (channels) must be cross calibrated. The 1989 joint E-SAR/DC-8 SAR calibration campaign gave a first opportunity for such an experiment, including cross sensor and cross track calibration. A basic requirement for successful cross calibration is the stability of the SAR systems. The calibration parameters derived from different tracks and the polarimetric properties of the uncalibrated data are used to describe this stability. Quality criteria for a successful cross calibration are the agreement of alpha degree values and the consistency of radar cross sections of equally sized corner reflectors. Channel imbalance and cross talk provide additional quality in case of the polarimetric DC-8 SAR.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 31; 1; p. 237-245.
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  • 2
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    Atomic oxygen fine-structure splittings with tunable far-infrared spectroscopy (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Fine-structure splittings of atomic oxygen (O-16) in the ground state have been accurately measured using a tunable far-infrared spectrometer. The 3P0-3pl splitting is 2,060,069.09 (10) MHz, and the 3Pl-3P2 splitting is 4,744,777.49 (16) MHz. These frequencies are important for measuring atomic oxygen concentration in earth's atmosphere and the interstellar medium.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 371; L85
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  • 3
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    Far-infrared self-broadening in methylcyanide - Absorber-perturber resonance (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Using tunable far-infrared spectrometers with high-frequency stability and accuracy, the self-pressure broadening and shift of CH3CN are measured. Evidence of absorber-perturber resonance effects on the collisional line shape are obtained. This tests the theoretical model and its possible improvements and also allows predictions of broadening and shift for a large class of molecules. Moreover, the resonance effect produces a theoretical temperature dependence of self-broadening that is different from what is commonly assumed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A (ISSN 1050-2947); 45; 9 Ma
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  • 4
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    Frequency measurement of the J = 1-0 rotational transition of HD (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The frequency of the astronomically important J = 1-0 rotational transition of HD at 2.7 THz (90/cm) has been measured with tunable FIR radiation with an accuracy of 150 kHz. This frequency is now known to sufficient accuracy for use in future astrophysical heterodyne observations of HD in planetary atmospheres (reported by Bezard et al., 1986) and in the interstellar medium (reported by Bussoletti et al., 1975).
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 330; L135
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  • 5
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    Laboratory measurement of the rotational spectrum of the OH radical with tunable far-infrared research (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Rotational and fine-structure transitions between the low rotational levels of the OH radical in its X 2Pi state have been observed in absorption in the laboratory. It has thus been possible to measure the frequencies of these transitions directly. The observations were made with tunable far-infrared radiation generated by mixing two chosen CO2 laser frequencies in a metal-insulator-metal diode; the far-infrared difference frequency was radiated from the diode's whisker antenna. The measurements have an accuracy of a few hundred kHz. They both confirm and improve on the best previous estimates, which were obtained by extrapolation of laser magnetic resonance data.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 307; 410-413
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  • 6
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    A sequential filter radiometer for sensing the vertical temperature profile of the earth's atmosphere (1971)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Spacecraft-borne IR sequential filter radiometer design and performance for real time meteorological forecasting and atmospheric temperature measurements
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: JOINT CONFERENCE ON INFRA-RED TECHNIQUES; Sep 21, 1971 - Sep 23, 1971; READING, BERKS.
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