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  • 1
    Digitale Medien
    Digitale Medien
    Measurement of Seebeck coefficient using a large thermal gradient (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 951-954 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The integral method of measuring the Seebeck voltage V(T), in which one end of the sample is held at a fixed temperature TC, and the other end is varied through the temperature T range of interest, has been adapted to short rod-shaped samples. The Seebeck coefficient S is obtained from the slope of the V(T) vs T curve, i.e., S=dV(T)/dT. The apparatus has been completely automated such that the specimen is automatically cycled through a preselected temperature range, up to a maximum temperature of 1000 °C, and the V(T), T, and TC values are acquired, stored, and analyzed by means of a microcomputer. Simplicity of sample handling and minimal operator involvement make this method well suited to the survey of large numbers of samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139756
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  • 2
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    Measurement of Seebeck coefficient using a large thermal gradient (1988)
    American Institute of Physics
    Details
    Publikationsdatum: 1988-06-01
    Print ISSN: 0034-6748
    Digitale ISSN: 1089-7623
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Publiziert von American Institute of Physics
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    AKTUELLE ARTIKEL
  • 3
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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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    NASA TECHNICAL REPORTS
  • 4
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    Computerized data acquisition and analysis for measuring thermal diffusivity (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: JPL has been leading a concentrated effort to develop improved thermoelectric materials for space applications. Thermoelectric generators are an attractive source of electrical energy for space power because of lack of moving parts and slow degradation of performance. Thermoelectric material is characterized by: Seebeck coefficient, electrical resistivity and thermal conductivity. To measure the high temperature thermal conductivity is experimentally very difficult. However, it can be calculated from the specific heat and thermal diffusivity which are easier to measure at high temperatures, especially using the flash method. Data acquisition and analysis for this experiment were automated at JPL using inexpensive microcomputer equipment. This approach is superior to tedious and less accurate manual analysis of data. It is also preferred to previously developed systems utilizing expensive minicomputers or mainframes.
    Schlagwort(e): SOLID-STATE PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measuring Thermoelectric Properties Automatically (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Microcomputer-controlled system speeds up measurements of Hall voltage, Seebeck coefficient, and thermal diffusivity in semiconductor compounds for thermoelectric-generator applications. With microcomputer system, large data base of these parameters gathered over wide temperature range. Microcomputer increases measurement accuracy, improves operator productivity, and reduces test time.
    Schlagwort(e): MATERIALS
    Materialart: NPO-16507 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 106
    Format: text
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  • 6
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    Measuring Seebeck Coefficients With Large Thermal Gradients (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Apparatus takes measurements and analyzes data automatically. Cylindrical sample is pressed between heater and water-cooled baseplate. Thermocouples at opposite ends of sample provide both temperatures and Seeback voltages. Conveniently shaped samples used, and results calculated by microcomputer and printed out.
    Schlagwort(e): PHYSICAL SCIENCES
    Materialart: NPO-16667 , NASA Tech Briefs (ISSN 0145-319X); 10; 3; P. 57
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Improved techniques for predicting spacecraft power (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Radioisotope Thermoelectric Generators (RTGs) are going to supply power for the NASA Galileo and Ulysses spacecraft now scheduled to be launched in 1989 and 1990. The duration of the Galileo mission is expected to be over 8 years. This brings the total RTG lifetime to 13 years. In 13 years, the RTG power drops more than 20 percent leaving a very small power margin over what is consumed by the spacecraft. Thus it is very important to accurately predict the RTG performance and be able to assess the magnitude of errors involved. The paper lists all the error sources involved in the RTG power predictions and describes a statistical method for calculating the tolerance.
    Schlagwort(e): SPACECRAFT PROPULSION AND POWER
    Materialart: IECEC ''87; Aug 10, 1987 - Aug 14, 1987; Philadelphia, PA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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