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  • INSTRUMENTATION AND PHOTOGRAPHY  (46)
  • 1995-1999
  • 1980-1984
  • 1975-1979  (46)
  • 1979  (46)
  • 11
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    Modification of a Kowa RC-2 fundus camera for self-photography without the use of mydriatics (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Research on retinal circulation during space flight required the development of a simple technique to provide self monitoring of blood vessel changes in the fundus without the use of mydriatics. A Kowa RC-2 fundus camera was modified for self-photography by the use of a bite plate for positioning and cross hairs for focusing the subject's retina relative to the film plane. Dilation of the pupils without the use of mydriatics was accomplished by dark-adaption of the subject. Pictures were obtained without pupil constriction by the use of a high speed strobe light. This method also has applications for clinical medicine.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Brain Research Bulletin; 4; 1979
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Rough surface wavelength measurement through self mixing of Doppler microwave backscatter (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A microwave backscatter technique is presented that has the ability to sense the dominant surface wavelength of a random rough surface. The purpose of this technique is to perform this measurement from an aircraft or spacecraft, wherein the horizontal velocity of the radar is an important parameter of the measurement system. Attention will be directed at water surface conditions for which a dominant wavelength can be defined, then the spatial variations of reflectivity will have a two dimensional spectrum that is sufficiently close to that of waves to be useful. The measurement concept is based on the relative motion between the water waves and a nadir looking radar, and the fact that while the instantaneous Doppler frequency at the receiver returned by any elementary group of scatterers on a water wave is monotonically changing, the difference in the Doppler frequency between any two scattering 'patches' stays approximately constant as these waves travel parallel to the major axis of an elliptical antenna footprint. The results of a theoretical analysis and a laboratory experiment with a continuous wave (CW) radar that encompasses several of the largest waves in the illuminated area show how the structure in the Doppler spectrum of the backscattered signal is related to the surface spectrum and its parameters in an especially direct and simple way when an incoherent envelope detector is the receiver.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Antennas and Propagation; AP-27; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Pressure Modulator Radiometer (PMR) tests (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The pressure modulator technique was evaluated for monitoring pollutant gases in the Earth's atmosphere of altitude levels corresponding to the mid and lower troposphere. Using an experimental set up and a 110 cm sample cell, pressure modulator output signals resulting from a range of gas concentrations in the sample cell were examined. Then a 20 cm sample cell was modified so that trace gas properties in the atmosphere could be simulated in the laboratory. These gas properties were measured using an infrared sensor.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-159175
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Determination of noise equivalent reflectance for a multispectral scanner: A scanner sensitivity study (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The methods used to calculate the sensitivity parameter noise equivalent reflectance of a remote-sensing scanner are explored, and the results are compared with values measured over calibrated test sites. Data were acquired on four occasions covering a span of 4 years and providing various atmospheric conditions. One of the calculated values was based on assumed atmospheric conditions, whereas two others were based on atmospheric models. Results indicate that the assumed atmospheric conditions provide useful answers adequate for many purposes. A nomograph was developed to indicate sensitivity variations due to geographic location, time of day, and season.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-1575 , S-497
    Format: application/pdf
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  • 15
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    A liquid-helium-cooled grating spectrometer for far infrared astronomical observations (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A liquid-helium-cooled grating spectrometer has been developed for low-resolution far-infrared spectrometric measurements of astronomical sources conducted by the 30-cm NASA Lear Jet telescope. Simple MOSFET coupled transimpedance preamplifiers were adopted for the spectrometer design. The infrared spectrometer has resolving powers from 10 to 150 over the wavelength range from 45 to 115 microns.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astronomical Society of the Pacific; vol. 91
    Format: text
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  • 16
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    Continuous discharge Penning source with emission lines between 50 A and 300 A (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The present paper deals with a modified Penning discharge lamp developed specially to cover the soft X-ray and extreme UV spectral regions. The source produces a total of nearly 40 intense lines in the 50 to 300 A range. The lamp is quiet, continuous, and stable over most of the cathode lifetime (which is sufficient for long calibration runs). When the cathodes become exhausted, the refurbishment procedure is so simple that the source can be back on line in an hour or less
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 18; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Correction of instrumental distortion by analytical deconvolution of data (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A general analytical theorem developed by van de Hulst (1946) for inverting the convolution integral is reviewed and illustrated both with synthetic data and with experimental data from time-of-flight measurements. If the undesired influence of an instrument used in an experimental measurement can be represented by the convolution integral, the original undistorted or true distribution may sometimes be recovered in postprocessing the data by means of deconvolution. Analytical deconvolution is achieved by using the coefficients from a power series representation of the distorted output distribution and a set of 'solving polynomials' which may be readily derived from the response function of the instrument.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Chemical Physics; 70; Mar. 1
    Format: text
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  • 18
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    The charge injection device /CID/ as a stellar tracking sensor (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A 128 x 128 element CID imager was operated in a simulated stellar trackling environment and evaluated for temporal and pattern noise and spectral response over a temperature range of -40 C to +25 C. The test devices were fabricated on long-lifetime bulk silicon material and utilized very thin upper-level polysilicon electrodes for enhanced spectral response. A standard microcomputer was used to generate all control signals and to collect and process performance data. The results of this program were used to predict the performance of a 400 x 400 CID array designed specifically for stellar-tracking.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Recent advances in TV sensors and systems; August 27, 28, 1979; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    Multiband radiometer for field research (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A multiband radiometer for field research with 8 bands between 0.4 and 12.5 micrometers is described. The data acquisition system will record the results from the radiometer, a precision radiation thermometer, and ancillary sources. The radiometer and data handling systems will be adaptable to helicopter, truck, to tripod platforms; the system will also be suitable for portable hand-held operation. The general characteristics of this system are that it will be (1) inexpensive to acquire, maintain, and operate, (2) simple to calibrate, (3) complete with data handling hardware and software, and (4) well-documented for use by researchers.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Measurements of optical radiations; August 29, 30, 1979; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 20
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    Fine particulate capture device (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: To capture fine particulate matter in a gas such as air, a dielectric fluid is directed to the center of whichever face of a rotating disc is exposed to the air flow. The disc is comprised of two or more segments which bear opposite electrostatic potentials. As the dielectric fluid is centrifuged towards the periphery of the rotating disc, the fluid becomes charged to the same potential as the segment over which it is passing. Particulate matter is attracted to the charged segment and is captured by the fluid. The fluid then carries the captured particulate matter to a collection device such as a toroidal container disposed around the periphery of the disc. A grounded electrically-conductive ring may be disposed at the outer periphery of the disc to neutralize the captured particles and the fluid before they enter the container.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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