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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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High temperature thermocouple uses a thermoelement of noncircular cross section with insulation of circular cross section to provide space for the flow of coolant gas down the probe.
Fabrication techniques for high temperature thermocouples bind all components so that differential thermal expansion and contraction do not result in mechanical slippage and localized stress concentrations. Installation space is reduced or larger thermoelements and thicker insulation can be used to improve temperature measurement accuracy.
Thermocouple tubing of thoriated tungsten with a very fine grain structure produces a small-diameter sheath capable of operating up to 5000 degrees R in a hydrogen and graphite environment. This tubing remains ductile and resists both grain growth and carbiding even after prolonged exposure to temperature.
Thermocouple wire size and configuration effects on internal temperature measurements in charring ablator
Magnesium antimonide and magnesium bismuthide evaluated as thermocouple material for thermoelectric power generation
Constantan wire worked to a needle point and covered with a copper coating produces a small, concentric, fast-reaction thermocouple that has the fast response time necessary to measure rapid temperature changes accurately and only slightly alters the environment being measured.
Immersion type copper-constantan thermocouples for NERVA
Design, and calibration of iridium versus iridium-rhodium thermocouples
Single-thermocouple method for measuring heat flux in thermally thick walls
The thermocouple has been used for measuring temperatures for more than a century, but new materials, probe designs, and techniques are continually being developed. Numerous contributions have been made by the National Aeronautics and Space Administration and its contractors in the aerospace program. These contributions have been collected by Midwest Research Institute and reported in this publication to enable American industrial engineers to study them and adapt them to their own problem areas. Potential applications are suggested to stimulate ideas on how these contributions can be used.
Direct nuclear reactor radiation exposure effects on sheathed Chromel-Alumel and iron-Constantan thermocouples
Monitors welding based on weld characteristics and temperature gradients relation using constantan probe in contact with aluminum plate thermocouple junction
Si-Ge/cold/-Pb-Te/hot/ segmented thermocouples joined by bonding to tungsten intermediate, determining efficiency by measuring heat flux from cold side
Thermal electromotive force change for thermocouples in high temperature, low pressure environments for 3700 hours
Quartz-insulated, single-wire thermocouples installed on thin-wall rocket cooling tubes to measure hot-gas-side wall temperatures
Telemetry technique utilizing thermocouple sensors for base heating determinations on free flight blunt cone in shock tunnels, noting electrical noise reduction
Thermocouples dynamic response attached to thin skinned model under constant heating rate, considering error reduction in temperature measurement