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  • 1
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    Noise effects in an optical heterodyne spectrometer using tunable diode lasers (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A comparison of measured and predicted signal-to-noise ratio is made in an optical heterodyne spectrometer utilizing a tunable diode laser which exhibited excess noise. It is shown that good agreement between predicted and measured signal-to-noise ratios results if excess noise effects due to tunable diode lasers are included in the predictions. The methods used to quantify excess noise and to incorporate their effects into predictions of signal-to-noise ratio are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters; 39; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Measuring Excess Noise in SDL's (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New instrument gives quantitive information on "excess noise" in semiconductor-diode laser (SDL's). By proper selection of detector, instrument tests any SDL from visible wavelengths through thermal infrared. Lasers determine excess noise in SKL source by measuring photocurrent generated in photodetector exposed first to reference laser then to SKL under test.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-12938 , NASA Tech Briefs (ISSN 0145-319X); 7; 3; P. 244
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Design and evaluation of controls for drift, video gain, and color balance in spaceborne facsimile cameras (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The facsimile camera is an optical-mechanical scanning device which has become an attractive candidate as an imaging system for planetary landers and rovers. This paper presents electronic techniques which permit the acquisition and reconstruction of high quality images with this device, even under varying lighting conditions. These techniques include a control for low frequency noise and drift, an automatic gain control, a pulse-duration light modulation scheme, and a relative spectral gain control. Taken together, these techniques allow the reconstruction of radiometrically accurate and properly balanced color images from facsimile camera video data. These techniques have been incorporated into a facsimile camera and reproduction system, and experimental results are presented for each technique and for the complete system.
    Keywords: ELECTRONICS
    Type: NASA-TN-D-7333 , L-8845
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Lens window simplifies TDL housing (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Lens window seal in tunable-diode-laser housing replaces plan parallel window. Lens seals housing and acts as optical-output coupler, thus eliminating need for additional reimaging or collimating optics.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-12437 , NASA Tech Briefs (ISSN 0145-319X); 4; 2; P. 203
    Format: text
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  • 5
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    Optically coupling tunable diode lasers (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Proposed opticle coupling, using lenses and mirrors that replace complex mechanical systems, can combine separate tunable diode laser outputs and expand wavelength range. Method uses single cooler housing and requires no moving parts within cooler assembly.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-12438 , NASA Tech Briefs (ISSN 0145-319X); 4; 1; P. 49
    Format: text
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  • 6
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    Apparatus for ejection of an instrument cover (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Apparatus for ejecting covers of instrument packages using differential pressure principle
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: application/pdf
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  • 7
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    Excess noise in tunable diode lasers (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The method and the apparatus for identifying excess-noise regions in tunable diode lasers are described. These diode lasers exhibit regions of excess noise as their wavelength is tuned. If a tunable diode laser is to be used as a local oscillator in a superheterodyne optical receiver, these excess-noise regions severely degrade the performance of the receiver. Measurement results for several tunable diode lasers are given. These results indicate that excess noise is not necessarily associated with a particular wavelength, and that it is possible to select temperature and injection current such that the most ideal performance is achieved.
    Keywords: LASERS AND MASERS
    Type: NASA-TP-1935 , L-14453
    Format: application/pdf
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  • 8
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    Performance and evaluation of the Viking lander camera performance prediction program (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer program is described for predicting the performance of the Viking lander cameras. The predictions are primarily concerned with two objectives: (1) the picture quality of a reference test chart (of which there are three on each lander) to aid in diagnosing camera performance; and (2) the picture quality of cones with surface properties of a natural terrain to aid in predicting favorable illumination and viewing geometries and operational camera commands. Predictions made with this program are verified by experimental data obtained with a Viking-like laboratory facsimile camera.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-72646
    Format: application/pdf
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  • 9
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    Design and evaluation of a filter spectrometer concept for facsimile cameras (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The facsimile camera is an optical-mechanical scanning device which was selected as the imaging system for the Viking '75 lander missions to Mars. A concept which uses an interference filter-photosensor array to integrate a spectrometric capability with the basic imagery function of this camera was proposed for possible application to future missions. This paper is concerned with the design and evaluation of critical electronic circuits and components that are required to implement this concept. The feasibility of obtaining spectroradiometric data is demonstrated, and the performance of a laboratory model is described in terms of spectral range, angular and spectral resolution, and noise-equivalent radiance.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-7717 , L-9656
    Format: application/pdf
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  • 10
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    Laser communication system for controlling several functions at a location remote to the laser (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multichannel laser remote control system is described. The system is used in areas where radio frequency, acoustic, and hardware control systems are unsatisfactory or prohibited and where line of sight is unobstructed. A modulated continuous wave helium-neon laser is used as the transmitter and a 360 degree light collector serves as the antenna at the receiver.
    Keywords: MASERS
    Format: application/pdf
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