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  • 1
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    The meteorological satellite: overview of 25 years of operation (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-01-31
    Description: The first weather satellite was launched on 1 April 1960. In the 25 years since, weather satellites have contributed to improved weather analyses and forecasts worldwide. As a maturing component of a global observing system, the meteorological satellite promises even greater financial benefits and a higher quality of life to mankind.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, W L -- Bishop, W P -- Dvorak, V F -- Hayden, C M -- McElroy, J H -- Mosher, F R -- Oliver, V J -- Purdom, J F -- Wark, D Q -- New York, N.Y. -- Science. 1986 Jan 31;231(4737):455-62.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17776017" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Temperature-dependent etalon effects in laser systems (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Temperature dependent extracavity and intracavity etalon effects in optical materials for carbon dioxide lasers
    Keywords: MASERS
    Type: ; IENCES (
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    NASA TECHNICAL REPORTS
  • 3
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    Carbon dioxide laser intersatellite communication systems (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Carbon dioxide laser intersatellite communication systems as economical alternative to microwave and millimeter systems, noting use onboard ATS satellites
    Keywords: MASERS
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    NASA TECHNICAL REPORTS
  • 4
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    An infrared heterodyne radiometer for high-resolution measurements of solar radiation and atmospheric transmission (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A tunable, Dicke-switched, infrared heterodyne radiometer (IHR) has been designed, fabricated, tested, and used to observe solar radiation and determine the atmospheric transmissivity in the 9-11-micron spectral band. The IHR provides a spectral resolution of 0.0067 reciprocal cm, a minimum detectable power level of 2.9 times ten to the minus twenty-third power W/Hz, and a temperature resolution of less than 1 K for a source temperature of 1000 K, an IF predetection bandwidth of 100 MHz, and an integration time of 30 s. Detailed design equations and measured IHR performance are presented. The IHR was used to make solar and atmospheric transmission measurements, and a vertical-path atmospheric attenuation of 2.3 dB has been established under favorable weather conditions. The attenuation of solar radiation due to cloud cover and haze has also been investigated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Journal of Quantum Electronics; QE-11; Aug. 197
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    NASA TECHNICAL REPORTS
  • 5
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    CO2 laser communication systems for near-earth space applications (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Projections of the growth of earth-sensing systems for the latter half of the 1980's show a data-transmission requirement of 300 Mbit/s and above. The most efficient technique to return the data from a sensing satellite to a ground station is through a geosynchronous data relay satellite. A laser system is most attractive for the space-to-space link. A five-year program was conducted which has shown the basic technical feasibility of accomplishing this link with a CO2 laser system operating at a wavelength near 10 microns. The system uses a mercury-cadmium-telluride infrared mixer cooled to approximately 100 K by a radiative cooler. The laser local oscillator and coupling-modulated laser transmitter use conductively cooled beryllium oxide construction. The optical antenna for transmission and reception has a gain of nominally 92 dB with a 3-dB beamwidth of 80 microrad. Tracking jitter is less than ten microrad, and signal acquisition occurs in less than 1 min. The receiver subsystem has a sensitivity of 10 to the -19th power W/Hz, accommodates a 300-Mbit/s data rate, and can track Doppler frequency variations over a + or - 700-MHz range.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE; vol. 65
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    NASA TECHNICAL REPORTS
  • 6
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    Laser tuners using circular piezoelectric benders (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The paper presents the results of an experimental evaluation of a new type of piezoelectric ceramic device designed for use as a laser mirror tuner. Thin plates made from various materials were assembled into a circular bimorph configuration and tested for linearity of movement, maximum travel, and resonant frequency for varying conditions of clamping torque and mirror loading values. Most of the devices tested could accept mirror diameters up to approximately 1.3 cm and maintain a resonant frequency above 2 kHz. Typical mirror translation without measurable tilt was plus or minus 20 micrometers or greater for applied voltages of less than plus or minus 300 V.
    Keywords: LASERS AND MASERS
    Type: Applied Optics; 14; June 197
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    NASA TECHNICAL REPORTS
  • 7
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    Multichannel television coupling modulation experiments using a CO2 laser. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Experiments are described in which a carbon dioxide laser oscillating at 28.4 THz has been modulated simultaneously by three commercial television signals with carriers at 54, 66, and 82 MHz. Signal-to-noise degradation in the system was measured to be less than 1 dB, corresponding to modulator drive power of 1 W. This combination of wide bandwidth and low power consumption was made possible by the application of coupling modulation. This technique employs an intracavity electrooptic crystal to which the modulating fields are applied. Despite the fact that the crystal is positioned inside the laser cavity, the maximum bandwidth attainable is independent of both the cavity Q and the laser transition linewidth, and is limited only by modulator characteristics and optical transit time. Rigrod's (1965) method has been adapted to obtain an expression for the power coupled out of the laser. Modulator frequency response and drive power requirements are also summarized. It is seen that the noise bandwidth performance of the system would allow simultaneous modulation by 17 color television channels, or equivalently, more than a 300-megabit/sec capacity.
    Keywords: MASERS
    Type: Optical Engineering; 11; May-June
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    NASA TECHNICAL REPORTS
  • 8
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    Infrared heterodyne solar radiometry. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An infrared heterodyne radiometer has sufficient sensitivity for application to high resolution spectrometric studies of the sun and the absorption of sunlight in the atmosphere. In the 10-micron region, the resolution can typically range from less than .0067/cm to .067/cm. The minimum detectable signal can approach 10 to the -24th power W/Hz. The infrared heterodyne radiometer (IHR) can also be used for atmospheric propagation studies at the emission frequencies of the CO2 laser for the examination of the feasibility of space-to-ground laser communication links.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 11; July 197
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    NASA TECHNICAL REPORTS
  • 9
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    Measurements on a near-confocal optical resonator. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Near confocal optical resonator measurements for multimode power output of carbon dioxide laser
    Keywords: MASERS
    Type: ; OFYSISKE PUBLIKASJON
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    NASA TECHNICAL REPORTS
  • 10
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    Photoconductivity - An instructive exercise in semiconductor theory. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Photoconductivity defined, discussing applications to IR detection and energy band structure and impurity levels in germanium
    Keywords: PHYSICS, SOLID-STATE
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
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