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  • 1
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    Unknown
    Development of a drive system for a sequential space camera (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Breadboard models of single and dual motor drives for the shutter, claw and magazine of a space camera system were designed and tested. The single motor technique utilizes a single electronically commutated motor to drive the claw and shutter without resorting to a solenoid actuated clutch for pulse operation. Shutter speed is established by a combination of the cinemode speed and the opening of the conventional DAC two piece shutter. Pulse mode operation is obtained by applying power at a fixed clock rate and removing power at an appropriate point in the mechanical cycle such that the motor comes to rest by system friction. The dual motor approach utilizes a stepper motor to drive the shutter and an electronically commutated dc motor to drive the claw and magazine functions. The motors are synchronized electronically.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-147759 , SPO-30352-ADD
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of a drive system for a sequential space camera (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An electronically commutated dc motor is reported for driving the camera claw and magazine, and a stepper motor is described for driving the shutter with the two motors synchronized electrically. Subsequent tests on the breadboard positively proved the concept, but further development beyond this study should be done. The breadboard testing also established that the electronically commutated motor can control speed over a wide dynamic range, and has a high torque capability for accelerating loads. This performance suggested the possibility of eliminating the clutch from the system while retaining all of the other mechanical features of the DAC, if the requirement for independent shutter speeds and frame rates can be removed. Therefore, as a final step in the study, the breadboard shutter and shutter drive were returned to the original DAC configuration, while retaining the brushless dc motor drive.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-147535 , SPO-30352
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Aerosol size distributions - Remote determination from air-borne measurements of the solar aureole (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Aerosol-size distributions were determined remotely using an airborne scanning photometer. This instrument consists of a sunshade, optics, and a large-dynamic-range photodetector-amplifier system that scans about the vertical, recording both the direct attenuated solar beam and the diffuse sky radiance in the almucantar of the sun at an effective wavelength of 0.54 micron. Inversion of the measured radiances determined aerosol radii from approximately 0.2 to 8.0 microns. Data were taken during flights over western Lake Superior and southwestern Wisconsin. Inverted aerosol-size distributions are compared with results obtained by other methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 15; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Engineering design criteria for an image intensifier/image converter camera (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design, display, and evaluation of an image intensifier/image converter camera which can be utilized in various requirements of spaceshuttle experiments are described. An image intensifier tube was utilized in combination with two brassboards as power supply and used for evaluation of night photography in the field. Pictures were obtained showing field details which would have been undistinguishable to the naked eye or to an ordinary camera.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-151112 , SPO-30348
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Test results on intensified charge coupled devices (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: CCD imaging arrays were evaluated for a photon counting astronomical sensor. Results show noise corresponding to less than 100 rms electrons and gains of approximately 1000 at 10kV accelerating voltage (greater than 5000 at 25kV). Measured charge transfer efficiencies are in excess of 0.9999, signal saturation levels are as high as 990000 electrons per pixel and peak quantum efficiencies are greater than 75%. Successful proximity focussed intensified charge coupled devices (ICCD) have been fabricated, although problems still exist with contamination and possible structural failures in the CCD's during tube manufacture.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Low light level devices for science and technology; Mar 22, 1976 - Mar 23, 1976; Reston, VA
    Format: text
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    NASA TECHNICAL REPORTS
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