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  • Weitere Quellen  (48)
  • INSTRUMENTATION AND PHOTOGRAPHY  (48)
  • Humans
  • 1985-1989  (48)
  • 1988  (48)
  • 1
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    Advanced altimetry (1988)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The radar altimeter being developed for the Ocean Topography Experiment (TOPEX) will have an inherent instrument precision of 2 to 3 cm. While some minor refinements may be possible in the future, major geophysical advances could be made if altimetric measurements over a wide swath of the Earth's surface were possible. The NASA Headquarters Oceanic Processes Branch is supporting a 3-year investigation of the technological issues inherent in the precision measurement of topography from spaceborne platforms at angles off-nadir. To explore the off-nadir measurement of topography, a flexible, airborne radar instrument system is being developed. Its hardware design is now complete, and it is made up of several subsystems. The antenna selected is a dielectric lens of .894 m diameter. The RF subsystem uses phase-locked oscillators, FET solid-state amplifiers, and times four frequency multipliers to develop a transmit signal at a frequency of 36.0 GHz and a local oscillator signal at a frequency of 35.4 GHz. Lecroy 6880 digitizers under computer control digitize the five receiver outputs. The digital subsystem consists of six single-board Heurikon processors. At this time, the instrument construction continues with final system integration planned for November 1988.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Laboratory for Oceans; p 45-47
    Format: application/pdf
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  • 2
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    Two-mirrored galvanometer laser light sheet generator (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Light sheets generated with either laser or noncoherent sources have found widespread application to flow visualization. Previous light sheet generating systems were usually dedicated to a specific viewing geometry. The technique with the most flexibility is the galvanometer mirror based laser light sheet system. A two-mirrored system was designed and developed to provide flexibility and adaptability to a wide range of applications. The design includes the capability to control the size and location of the laser light sheet in real time, to generate horizontal or vertical sheets, to sweep the sheet repeatedly through a volume, to generate multiple sheets with controllable separation and to rotate single or multiple laser light sheets. The system is capable of producing up to 12 sheets of laser light at an angular divergence of + or - 20 degrees. Maximum scan rate of any one line is 500 Hertz. This system has proven to be uniquely versatile and a patent has been applied for.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: AIAA PAPER 88-4680
    Format: text
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  • 3
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    Direct and interferometric imaging approaches for detecting earth-like extrasolar planets (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: This paper discusses functional requirements of space-based observational systems with sufficient sensitivity, resolution, and dynamic range to image earth-like extrasolar planets within a search radius of 10 parsecs from the sun. Both direct and interferometric systems operating at visible and infrared wavelengths are evaluated, and the methods used to establish the system tolerances are presented. Due to the more favorable star/planet contrast ratio in the infrared, optical tolerance requirements are less stringent than in the visible. However, reduction of thermal radiation from the telescope requires cooling of the primary optics. Other tradeoffs between various approaches are enumerated.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: AIAA PAPER 88-0553
    Format: text
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  • 4
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    Experimental comparison of two hot-wire techniques for resolution of turbulent mass flux and local stagnation temperature in supersonic flow (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The performance of two constant-temperature normal hot-wire techniques in a supersonic flow is examined. The first technique uses a single-wire and rapid scanning of multiple overheat ratios. Time averages of the signals at all overheats are used to separate the mean and rms mass flux, stagnation temperature and their cross-correlation. The second technique uses a dual-wire probe with each wire operating at different overheat ratios, giving instantaneous mass flux and stagnation temperature. Preliminary results indicate that the separation distance (0.18 mm) between the two hot wires in the dual-wire probe does not introduce significant error. However, the rms mass flux inferred from the dual-wire technique is a factor of two higher than that from the single-wire technique.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: AIAA PAPER 88-0422
    Format: text
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  • 5
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    Calibration of single particle sizing velocimeters using photomask reticles (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The development of photomask reticle calibration standards for single particle instruments is discussed. The calibration method studied involves the use of photomask reticles where the particle artifacts are actually disks of chrome thin film in the clear field reticles produced by photolithography and etching processes. Consideration is given to various aspects of theory, design, and performance.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: International Symposium on Applications of Laser Anemometry to Fluid Mechanics; Jul 11, 1988 - Jul 14, 1988; Lisbon; Portugal
    Format: text
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  • 6
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    Response function of a tunable diode laser spectrometer from an iterative deconvolution procedure (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: A deconvolution procedure commonly used for resolution enhancement of spectra has been applied to the determination of the response function of a tunable diode laser spectrometer. The method is sufficiently fast and simple for routine application when correcting for nonnegligible instrumental broadening. Absolute linestrengths of CH4 in the 1327/cm region and line positions of HNO3 in the 1335/cm region, measured with the aid of the deconvolution technique, are reported here.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 39; 247-253
    Format: text
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  • 7
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    Measurement of Seebeck coefficient using a large thermal gradient (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: The integral method of measuring the Seebeck voltage, V(T), has been applied to short rod-shaped samples. In the present method, one end of the sample is held at a fixed temperature and the other end is automatically varied through a temperature T range of interest, up to a maximum temperature of 1000 C. The Seebeck coefficient is then obtained from the slope of the V(T) vs T curve. The method offers simplicity of sample handling and minimal operator involvement.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Review of Scientific Instruments (ISSN 0034-6748); 59; 951-954
    Format: text
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  • 8
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    Spectrogoniometer for measuring planetary surface materials at small phase angles (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: This paper describes an instrument, termed spectrogoniometer, which was designed to measure the bidirectional reflectance properties of planetary surface analogs at very small phase angles. By using a pellicle beam splitter, a highly collimated laser light source, and a carefully aligned apparatus it was possible to measure the reflectance properties of geologic samples under any viewing geometry: the angles of incidence and emission ranging from 0 to 90 deg, and the azimuthal angle ranging from 0 to 360 deg. The results on the effect of porosity are demonstrated by comparing measurements on a compact sample (with a void space of 25 percent) and a fluffy sample (with a void space of 90 percent). The fluffy sample exhibited a 30-percent increase in intensity between 10 and 0 deg, whereas the compact sample exhibited only a 20-percent increase.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics (ISSN 0003-6935); 27; 161-165
    Format: text
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  • 9
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    Laboratory diode laser spectroscopy in molecular planetary astronomy (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: Infrared spectroscopy of planetary atmospheres is performed at high spectral resolution comparable to that in the laboratory. This requires that laboratory spectroscopy use the highest resolution and the most accurate techniques. Tunable diode laser spectroscopy can supply many of the spectroscopic parameters needed by astronomers. In particular, line positions, line strengths, and collisional line widths are measured with diode lasers, and these are often among the best values available. Diode laser spectra are complimentary to lower resolution, broader-coverage Fourier transform spectra. Certain procedures must be adopted, however, when using diode lasers, for determining their output characteristics and for calibrating each spectrum against quality references.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 40; 221-238
    Format: text
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  • 10
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    Advances toward high spectral resolution quantum X-ray calorimetry (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: Thermal detectors for X-ray spectroscopy combining high spectral resolution and quantum efficiency have been developed. These microcalorimeters measure the energy released in the absorption of a single photon by sensing the rise in temperature of a small absorbing structure. The ultimate energy resolution of such a device is limited by the thermodynamic power fluctuations in the thermal link between the calorimeter and isothermal bath and can in principle be made as low as 1 eV. The performance of a real device is degraded due to noise contributions such as excess 1/f noise in the thermistor and incomplete conversion of energy into phonons. The authors report some recent advances in thermometry, X-ray absorption and thermalization, fabrication techniques, and detector optimization in the presence of noise. These improvements have resulted in a device with a spectral resolution of 17 eV FWHM, measured at 6 keV.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 35; 59-64
    Format: text
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