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  • 1
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    NASA applications for acousto-optic spectrometers (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Small, compact, and rugged IF spectrometers are needed in high resolution heterodyne receivers designed for a new generation of space-borne telescopes planned for the next decade. Acousto-optic Spectrometers (AOS) promise to provide the necessary bandwidth and resolution in a package which is compact, power efficient, and ruggedized for space applications. Sensitivity, linearity, and stability are the primary goals of an astronomical receiver and these features must be demonstrated in order for an AOS to be accepted in place of more conventional RF or digital technology.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Fiber-coupled high resolution infrared array spectrometer for the Kuiper Airborne Observatory (1990)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A novel cryogenic grating spectrometer (FCAS) is being designed for observations of volatiles in cometary and planetary atmospheres, and in newly forming planetary systems. The instrument features two-dimensional detector arrays coupled to a high-dispersion echelle by infrared fibers, and will achieve a spectral resolving power of about 40,000. The primary observational platform for this instrument will be the Kuiper Airborne Observatory, but it will also be configured for use at ground-based observatories. Initially, the spectrometer will use a 58 x 62, 1- to 5-micron InSb array. Larger-format IR arrays and arrays of different composition, will later be incorporated as they become available. The instrument will be used in two modes. The first uses a large format IR array in the spectral image plane for the customary one-dimensional spectral-one-dimensional spatial coverage. In the second mode, a massive, coherent bundle of infrared transmitting ZrF4 fibers will be installed after the dispersive element, to reformat the two-dimensional array into an elongated one-dimensional array for wide spectral coverage, allowing multiple lines to be measured in a single integration with high sensitivity. The overall instrument design is discussed, and the system sensitivity is estimated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Instrumentation in Astronomy VII; Feb 13, 1990 - Feb 17, 1990; Tucson, AZ; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Acousto-optic spectrometer for radio astronomy (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Recent developments in acousto-optic techniques and in photodetector arrays have made feasible a new type of RF spectrometer, offering the advantages of wide bandwidth, high resolution, large number of channels in compact, lightweight, energy efficient, and relatively low cost systems. Such a system employs an acousto-optic diffraction cell which serves the key role of converting RF signals to ultrasonic traveling-waves modulating the optical index of the cell. The cell is illuminated across its aperture by a monochromatic laser beam. A fraction of the light is diffracted by the acoustic waves. A focusing lens follows the cell and essentially performs a Fourier transform of the RF signal into a far-field intensity pattern. CSIRO in Australia and the Tokyo Astronomical Observatory in Japan have taken the lead in using acousto-optic techniques in astronomical applications. The first practical device was successfully made at CSIRO for obtaining dynamical spectrographs of solar radio emission.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: 1980 International Optical Computing Conference; Apr 08, 1980 - Apr 11, 1980; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A 10 micron heterodyne receiver for ultra high resolution astronomical spectroscopy (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An improved CO2 laser heterodyne spectrometer is examined. The present system uses reflective optics to eliminate refocusing at different wavelengths, and the local oscillator is a line-center-stabilized isotopic CO2 laser. A tunable diffraction grating makes possible easy and rapid selection of over 50 transitions per isotope of CO2. The IF (0 to 1.6 GHz) from the HgCdTe photomizer is analyzed by a 128-channel filter bank, consisting of 64 tunable 5-MHz filters and 64 fixed 25-MHz RF filters. These filters provide resolving powers of about 1,000,000 to 10,000,000 and velocity resolution of 50 to 250 m/sec; their output is synchronously detected, integrated, multiplexed and stored in a buffer memory for the desired integration period. Kitt Peak observations show the wide spectral coverage, wide mixer and electronics bandwidth, and high sensitivity of the system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Symposium on Interstellar molecules; Aug 06, 1979 - Aug 10, 1979; Mont Tremblant, Quebec; Canada
    Format: text
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    NASA TECHNICAL REPORTS
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