Power conditioning equipment for a Thermoelectric Outer Planet Spacecraft Quarterly technical report, 1969
Construction and testing of breadboard circuits with quad redundant switching devices
Andrews, R.↗
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Resistivity and Hall measurements of thermoelectric materials
Instrumentation setup measures resistivity values between .000003 and 100,000 ohm-cm and Hall values between 0.2 and 10 billion cc/coulomb, with an absolute error of less than 5 percent. Results of measurement are given for 8 electrical brush specimens and pure silver.
Ruff, R. D.↗
Thermoelectricity in magnetic alloys Final technical report
Seebeck coefficients in metallic alloys using iron doped silver palladium alloys between 4.2 and 520 K
Sellmyer, D. J.↗
Power conditioning equipment for a thermoelectric outer planet spacecraft Quarterly technical report
Switching circuit, bypass, and power conditioning circuit tests for TOPS electrical system
Andrews, R.↗
Nuclear radiation environment analysis for thermoelectric outer planet spacecraft
Neutron and gamma ray transport calculations were performed using Monte Carlo methods and a three-dimensional geometric model of the spacecraft. The results are compared with similar calculations performed for an earlier design.
Davis, H. S.↗
Thin film thermoelectric devices as thermal control coatings: A study
Peltier effect, Thomson effect, and Seeback effect are utilized in design of thermal control coating that serves as versatile means for controlling heat absorbed and radiated by surface. Coatings may be useful in extreme temperature environment enclosures or as heat shields.
Clemons, J. M.↗
NaK loop testing of thermoelectric converter modules (SNAP program)
The history of testing of compact tubular modules in flowing NaK loops is summarized. Test procedures, data handling, and instrument calibration are discussed. Also included is descriptive information of the test facilities, operational problems encountered, and some recommendations for testing.
Johnson, J. L.↗
Detailed mathematical models of a radioisotope thermoelectric generator.
Two new models for the design and performance analysis of RTG's are outlined in this paper. The first model assumes a small-signal transient-type calculational sequence that permits the separation of steady-state operation of the generator from its dynamic behavior. The second model uses a numerical (finite difference) solution of the performance equations of the RTG. Both models enable the investigation of transient and steady-state performance of RTG's. Simplifying assumptions have been kept to a minimum in the new RTG models and these models enable the inclusion of generator end losses, axial temperature gradients and heat interchange between thermoelements and thermal insulation in RTG performance calculations in a self-consistent manner.
Dewinter, F.↗
The development of SiGe-PbTe segmented thermoelectric couples involving pressure-contacted junctions.
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Eggers, P. E.↗
The SNAP-19 radioisotopic thermoelectric generator experiment - Flight performance on the Nimbus III observatory.
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Fihelly, A. W.↗
The behavior of xenon when used as a fill-gas in a silicon germanium radioisotope thermoelectric generator.
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De Winter, F.↗
Time changes in the thermal conductivity of silicon germanium thermoelectric material caused by alloying processes
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De Winter, F.↗
Parametric tests of thermoelectric generator SNAP-11
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Rouklove, P.↗
The time and temperature behavior of the thermoelectric properties of 78 a/o Si-22 a/o Ge alloy
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Raag, V.↗
Thermoelectrically-cooled variable-temperature probe
Variable-temperature probe for electron spectroscopy requires no cryogenic liquids or resistance heating elements. Device consists of heat sink, probe tip, and nickel-plated copper body which resists oxidation and transfers heat efficiently between tip and heat sink.
Kelso, R. M.↗
Experimental and systems studies of the alkali metal thermoelectric converter for aerospace power
Previously cited in issue 15, p. 2361, Accession no. A82-31876
Bankston, C. P.↗
Application of the Parker flash method to high temperature thermoelectrics
Mathematical aspects of thermal diffusivity measurements are reviewed and applied to develop an experimental setup at JPL. Certain approximations commonly appearing in the literature are examined in some detail and rejected based upon sensitive slope variations having significant impact on the results. The final mathematical formulation used was one developed by Parker et al. (1961), which evaluated the diffusivity in a way that could be simply evaluated by examining an oscilloscope trace. A computer algorithm was written to examine solution sensitivity to the number of terms taken in the infinite series. The mathematical technique is being used at JPL to evaluate diffusivities of graphite, Boron Carbon and Lanthanum Sulphur compounds in the temperature range of 300 K to 1200 K.
Noon, E. L.↗
Thermoelectric and morphological effects of Peltier pulsing on directional solidification of eutectic Bi-Mn
Extensive in situ thermal measurements using Peltier Interface Demarcation (PID) during directional solidification of eutectic Bi/MnBi were carried out. Observations indicate that significant thermal transients occur throughout the sample as a result of the Peltier pulsing. The contributions of the Peltier, Thomson, and Joule heats were separated and studied as a function of pulse intensity and polarity. The Joule and the combined Peltier and Thomson thermal contributions were determined as a function of time during and after the current pulses, close to the solid/liquid interface. Variations of the Bi/MnBi particle morphology clearly reveal the interface shape, changes in interface velocity, meltback, and temporary loss of cooperative growth, as a result of the pulsing.
Silberstein, R. P.↗