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  • Lunar and Planetary Science and Exploration  (706)
  • Instrumentation and Photography  (225)
  • 2015-2019
  • 2005-2009
  • 2000-2004  (931)
  • 2002  (931)
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Keywords
Years
  • 2015-2019
  • 2005-2009
  • 2000-2004  (931)
Year
  • 1
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    Microaltimeter (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A microaltimeter measures altitude or range highly accurately from an orbiting vehicle. The microaltimeter has a low power solid state laser that is pulsed at a rate above 1 kilohertz. The pulses are delivered to a small telescope which sends them to a planetary surface and receives return reflections. A high efficiency photon detector measures received photons and supplies received photon signals to a process or which makes a time-based bin-wise comparison to find the time of flight and hence the range.
    Keywords: Instrumentation and Photography
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    NASA TECHNICAL REPORTS
  • 2
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    Empirical mode decomposition apparatus, method and article of manufacture for analyzing biological signals and performing curve fitting (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A computer implemented physical signal analysis method includes four basic steps and the associated presentation techniques of the results. The first step is a computer implemented Empirical Mode Decomposition that extracts a collection of Intrinsic Mode Functions (IMF) from nonlinear, nonstationary physical signals. The decomposition is based on the direct extraction of the energy associated with various intrinsic time scales in the physical signal. Expressed in the IMF's, they have well-behaved Hilbert Transforms from which instantaneous frequencies can be calculated. The second step is the Hilbert Transform which produces a Hilbert Spectrum. Thus, the invention can localize any event on the time as well as the frequency axis. The decomposition can also be viewed as an expansion of the data in terms of the IMF's. Then, these IMF's, based on and derived from the data, can serve as the basis of that expansion. The local energy and the instantaneous frequency derived from the IMF's through the Hilbert transform give a full energy-frequency-time distribution of the data which is designated as the Hilbert Spectrum. The third step filters the physical signal by combining a subset of the IMFs. In the fourth step, a curve may be fitted to the filtered signal which may not have been possible with the original, unfiltered signal.
    Keywords: Instrumentation and Photography
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  • 3
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    Real-time exhaust gas modular flowmeter and emissions reporting system for mobile apparatus (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A real-time emissions reporting system includes an instrument module adapted to be detachably connected to the exhaust pipe of a combustion engine to provide for flow of exhaust gas therethrough. The instrument module includes a differential pressure probe which allows for determination of flow rate of the exhaust gas and a gas sampling tube for continuously feeding a sample of the exhaust gas to a gas analyzer or a mounting location for a non-sampling gas analyzer. In addition to the module, the emissions reporting system also includes an elastomeric boot for detachably connecting the module to the exhaust pipe of the combustion engine, a gas analyzer for receiving and analyzing gases sampled within the module and a computer for calculating pollutant mass flow rates based on concentrations detected by the gas analyzer and the detected flowrate of the exhaust gas. The system may also include a particulate matter detector with a second gas sampling tube feeding same mounted within the instrument module.
    Keywords: Instrumentation and Photography
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  • 4
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    Method and systems for collecting data from multiple fields of view (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Systems and methods for processing light from multiple fields (48, 54, 55) of view without excessive machinery for scanning optical elements. In an exemplary embodiment of the invention, multiple holographic optical elements (41, 42, 43, 44, 45), integrated on a common film (4), diffract and project light from respective fields of view.
    Keywords: Instrumentation and Photography
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  • 5
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    Hyperion's Dark Material: Rotational Variation (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We present two new dark material spectra of Hyperion compared with previously published dark material spectra of Hyperion and Iapetus. A 0.67-micron absorption feature is seen in one of the two new spectra. This suggests possible mineralogical differences across the surface of this Saturnian satellite. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
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    NASA TECHNICAL REPORTS
  • 6
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    Delta-doped CCD's as low-energy particle detectors and imagers (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: The back surface of a thinned charged-coupled device (CCD) is treated to eliminate the backside potential well that appears in a conventional thinned CCD during backside illumination. The backside of the CCD includes a delta layer of high-concentration dopant confined to less than one monolayer of the crystal semiconductor. The thinned, delta-doped CCD is used to detect very low-energy particles that penetrate less than 1.0 nm into the CCD, including electrons having energies less than 1000 eV and protons having energies less than 10 keV.
    Keywords: Instrumentation and Photography
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  • 7
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    Silicon base plate with low parasitic electrical interference for sensors (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A microgyroscope has a baseplate made of the same material as the rest of the microgyroscope. The baseplate is a silicon baseplate having a heavily p-doped epilayer covered by a thick dielectric film and metal electrodes. The metal electrodes are isolated from the ground plane by the dielectric. This provides very low parasitic capacitive coupling between the electrodes. The thick dielectric reduces the capacitance between the electrodes and the ground plane.
    Keywords: Instrumentation and Photography
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    NASA TECHNICAL REPORTS
  • 8
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    Workshop on Spectroscopy of the Martian Surface: What Next? (2002)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Members of the Mars infrared spectral community desired to assess what spectral instrument will best serve the Mars program and spectral community after the successful flight of currently planned instruments. It was felt this issue needed to be addressed, given the shift of the NASA Mars program toward a search for regions conductive to the preservation of biomarkers, and the desire for sample return. To this end, leaders of the planetary community with expertise in spectroscopy and remote mineral identification met to discuss the state of understanding of Mars surface composition, and to assess what critical gaps may exist: 1) after the successful completion of planned measurements of Mars; and 2) in research programs to support investigations of the current and planned data sets. Participants also discussed the proposed Mars airplane. This report summarizes our consensus.
    Keywords: Lunar and Planetary Science and Exploration
    Type: LPI-Contrib-1149 , Jun 10, 1999 - Jun 11, 1999; Houston, TX; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Origins of Small Volcanic Cones on Mars (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-08-17
    Description: Studies of volcanic cones identified in the MGS data indicate a range of possible origins, from primary vent constructs (cinder cones, tuff cones) to rootless cones formed by lava-ice interaction. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
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    NASA TECHNICAL REPORTS
  • 10
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    Shield Fields Within the Nemesis Tessera Quadrangle, Venus (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-08-17
    Description: Here we study small edifice concentrations in parts of Nemesis Tessera to quantify their spatial distribution and density. Does this affect shield field size, and do specific density values characterize different tectonic settings? Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
    Format: text
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