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  • INSTRUMENTATION AND PHOTOGRAPHY  (79)
  • 2020-2024
  • 2010-2014
  • 1980-1984  (79)
  • 1970-1974
  • 1945-1949
  • 1981  (79)
Collection
Keywords
Years
  • 2020-2024
  • 2010-2014
  • 1980-1984  (79)
  • 1970-1974
  • 1945-1949
Year
  • 1
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    Multichannel scanning radiometer for remote sensing cloud physical parameters (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A multichannel scanning radiometer developed for remote observation of cloud physical properties is described. Consisting of six channels in the near infrared and one channel in the thermal infrared, the instrument can observe cloud physical parameters such as optical thickness, thermodynamic phase, cloud top altitude, and cloud top temperature. Measurement accuracy is quantified through flight tests on the NASA CV-990 and the NASA WB-57F, and is found to be limited by the harsh environment of the aircraft at flight altitude. The electronics, data system, and calibration of the instrument are also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 52; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Performance of single photon-counting X-ray charge coupled devices (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results of intial performance tests on X-ray sensing properties of charge-coupled devices (CCDs) are presented. CCDs have demonstrated excellent spatial resolution and good spectral resolution, superior to that of non-imaging proportional counters.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center X-ray Astronomy in 1980's; p 289-299
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Real-time digital image enhancement (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A programmable system for enhancing monocular and stereographic images at video rates is presented. The system provides both automatic and interactive enhancement modes based on histogram modification and intensity mapping techniques. Experimental results which illustrate enhancement capabilities under a variety of scene types and conditions are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE; vol. 69
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An investigation of self-subtraction holography in LiNbO3 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A sample having self subtraction characteristics that were very promising was tested in depth: hologram formation times were on the order of 150 sec, the null signal was less than 2.5% of the peak signal, and no fatigue nor instability was detected over the span of the experiments. Another sample, fabricated with, at most, slight modifications did not perform nearly as well. In all samples, attempts to improve self subtraction characteristics by various thermal treatments had no effects or adverse effects, with one exception in which improvement was noted after a time delay of several days. A theory developed to describe self subtraction showed the observed decrease in beam intensity with time, but the shape of the predicted decay curve was oscillatory in contrast to the exponential like decay observed. The theory was also inadequate to account for the experimental sensitivity of self subtraction to the Bragg angle of the hologram. It is concluded that self subtraction is a viable method for optical processing systems requiring background discrimination.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-159336
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Design, development, and field demonstration of a remotely deployable water quality monitoring system (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A prototype water quality monitoring system is described which offers almost continuous in situ monitoring. The two-man portable system features: (1) a microprocessor controlled central processing unit which allows preprogrammed sampling schedules and reprogramming in situ; (2) a subsurface unit for multiple depth capability and security from vandalism; (3) an acoustic data link for communications between the subsurface unit and the surface control unit; (4) eight water quality parameter sensors; (5) a nonvolatile magnetic bubble memory which prevents data loss in the event of power interruption; (6) a rechargeable power supply sufficient for 2 weeks of unattended operation; (7) a water sampler which can collect samples for laboratory analysis; (8) data output in direct engineering units on printed tape or through a computer compatible link; (9) internal electronic calibration eliminating external sensor adjustment; and (10) acoustic location and recovery systems. Data obtained in Saginaw Bay, Lake Huron are tabulated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83152 , EPA-600/4-81-061
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Balloon-borne laser heterodyne radiometer for measurements of stratospheric trace species (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A laser heterodyne radiometer has been flown to measure chlorine monoxide in the stratosphere, which has an important role in the catalytic destruction of ozone. The measured values in the 35-38 km region are found to be significantly higher than model predictions, and the drop-off at lower altitudes occurs at a higher rate, even after adjusting the profile to include the solar zenith angle effects.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 20; Feb. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A solid-state digital temperature recorder for space use (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A solid-state, digital, temperature recorder has been developed for use in space experiments. The recorder is completely self-contained and includes a temperature sensor; all necessary electronics for signal conditioning, processing, storing, control and timing; and a battery power supply. No electrical interfacing with the particular spacecraft on which the unit is used is required. The recorder is small, light, and sturdy, and has no moving parts. It uses only biocompatible materials and has passed vibration and shock spaceflight qualification tests. The unit is capable of storing 2048, -10 to +45 C, 8-bit temperature measurements taken at intervals selectable by factors of 2 from 1.875 to 240 min; data can be retained for at least 6 months. The basic recorder can be simplified to accommodate a variety of applications by adding memory to allow more data to be recorded, by changing the front end to permit measurements other than temperature to be made, and by using different batteries to realize various operating periods. Stored flight data are read out from the recorder by means of a ground read-out unit.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-81267 , A-8482
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Development of a simple, self-contained flight test data acquisition system (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A low cost flight test data acquisition system, applicable to general aviation airplanes, was developed which meets criteria for doing longitudinal and lateral stability analysis. Th package consists of (1) a microprocessor controller and data acquisition module; (2) a transducer module; and (3) a power supply module. The system is easy to install and occupies space in the cabin or baggage compartment of the airplane. All transducers are contained in these modules except the total pressure tube, static pressure air temperature transducer, and control position transducers. The NASA-developed MMLE program was placed on a microcomputer on which all data reduction is done. The flight testing program undertaken proved both the flight testing hardware and the data reduction method to be applicable to the current field of general aviation airplanes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-168438 , KU-FRL-407-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Japanese-American Cooperative Emulsion Experiment /JACEE/ (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The instrumentation and results of long duration balloon flights carried out jointly by U.S. and Japan researchers to examine high energy cosmic rays are reported. Basic detector geometries are 2.5 sq m sr with operation at altitudes with 3-4 g/sq cm pressure, with observations thus far of over 100 hr. Energies from 2-100 TeV are recorded for nucleus-nucleus and hadron-nucleus interactions, and searches are made for new particle or interactions. The detector is an emulsion chamber which comprises doubly-coated nuclear emulsions on 800 micron thick methacryl substrates, X-ray films, etchable detectors, low density spacers, and lead sheets. Segmentation of the instrument into a primary charge module, a target section, a spacer section, and a lead-emulsion calorimeter allows accurate charge measurement for primary nuclei, reliable energy resolution, and a large geometrical factor for collecting high energy events. A primary Ca nucleus of 300 TeV has been observed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Elemental composition of aerosols in fourteen experiments of the Cloud Condensation Nuclei Workshop (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Aeosols were collected with two Ci impactors and analyzed with proton induced X-ray emission (PIXE) for chemical composition and to detect if contamination was present. One of the impactors sampled the generated aerosols; the other impactor sampled droplets from a diffusion cloud chamber. The purpose of the experiments was to test the feasibility of a study of the transfer of chemical elements from the fine particle sizes to the coarse particle sizes, after CCN are activated and cloud droplets are formed. The data indicated that sulfur-containing aerosols did exhibit the expected transfer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: in Desert Research Inst. The Third Intern. Cloud Condensation Nuclei Workshop; p 97-98
    Format: text
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