The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform

Gordon C Cucullu - One of the best experts on this subject based on the ideXlab platform.

  • Qualification Testing of Engineering Camera and Platinum Resistance Thermometer (PRT) Sensors for Mars Science Laboratory (MSL) Project under Extreme Temperatures to Assess Reliability and to Enhance Mission Assurance
    2015
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package Qualification and Verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (Engineering Camera and Platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight-like packages, sensors, and subassemblies have been selected for the study to survive three times (3x) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance due to either overstress or thermal cycle fatigue. Experiments of flight like hardware qualification test results have been described in this paper. Key words: Engineering camera, platinum Resistance Thermometer, hardware qualification

  • qualification testing of engineering camera and platinum Resistance Thermometer prt sensors for msl project under extreme temperatures to assess reliability and to enhance mission assurance
    Journal of microelectronics and electronic packaging, 2009
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package qualification and verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (engineering camera and platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight-like packages, sensors, and subassemblies have been selected for the study to survive three times (3×) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations, and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance du...

  • qualification testing of engineering camera and platinum Resistance Thermometer prt sensors for mars science laboratory msl project under extreme temperatures to assess reliability and to enhance mission assurance
    Proceedings of SPIE the International Society for Optical Engineering, 2008
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package Qualification and Verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (Engineering Camera and Platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight- like packages, sensors, and subassemblies have been selected for the study to survive three times (3×) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance due to either overstress or thermal cycle fatigue. Experiments of flight like hardware qualification test results have been described in this paper.

H Sakurai - One of the best experts on this subject based on the ideXlab platform.

  • rhodium iron Resistance Thermometer with fused silica coil frame
    Cryogenics, 1991
    Co-Authors: Osamu Tamura, H Sakurai
    Abstract:

    Abstract The dependences of the thermometric properties of a rhodium - iron (RhFe) (mole fraction 0.5%) wire Resistance Thermometer on the annealing temperature between 700 and 900°C are investigated using fused-silica coil frames. The Thermometers annealed at or above 800°C have similar temperature - Resistance characteristics. These Thermometers can be calibrated with an accuracy of 0.5 mK over the range 4.2–25 K using a reference temperature - Resistance function and three calibration points. RhFe wire Thermometers from different origins can be calibrated with an accuracy of the order of 10 mK in the same way. The temperature rise of the present Thermometers due to heating by the measuring current is in a reasonable range for thermometry with a millikelvin accuracy.

  • the platinum Resistance Thermometer range of the international temperature scale of 1990
    Metrologia, 1991
    Co-Authors: Luigi Crovini, R C Kemp, H J Jung, S K Ling, W Mangum, H Sakurai
    Abstract:

    Within the International Temperature Scale of 1990 (ITS-90) the platinum Resistance Thermometer (PRT) is used to realize the scale from approximately 13,8 K to 1 235 K. Such a temperature range is wider than the corresponding range in the International Practical Temperature Scale of 1968 (IPTS-68) because the PRT is used up to the freezing point of silver (1 234,93 K). In this way, the ITS-90 can be realized with much more precision than the IPTS-68, particularly between 901 K and 1 235 K where the standard Pt-10% Rh vs Pt thermocouple was previously used. This paper describes some important steps in the construction of the PRT reference function and the criteria for the selection of the PRT interpolating equations of the ITS-90. In contrast to previous international scales, the PRT range of the ITS-90 is based on two reference functions, one from 13,8 K to 273,16 K and the other from 273,15 K to 1 234,93 K. The two reference functions were obtained from two real PRTs. A set of interpolating equations is used to account for the differences of other real PRTs from those on which the reference functions are based. They provide flexibility of calibration and high precision as expressed, for instance, by non-uniqueness and sub-range inconsistency not exceeding 0,5 mK over the range from 13,8 K to 693 K. Such good properties are the consequence of the choice of suitable forms for the interpolating equations and of fine adjustments in the values assigned to some defining fixed points.

P M C Rourke - One of the best experts on this subject based on the ideXlab platform.

  • standard platinum Resistance Thermometer interpolations in a revised temperature scale
    Metrologia, 2020
    Co-Authors: D R White, P M C Rourke
    Abstract:

    The thermal metrology community is considering revising the International Temperature Scale of 1990 (ITS-90), motivated by the opportunity to improve the thermodynamic accuracy, reproducibility, and ease of use of the scale, as well as health and safety concerns with the use of mercury in the current scale. This paper considers the mathematical structure of the Standard Platinum Resistance Thermometer (SPRT) interpolations of the ITS-90 and identifies (i) mathematical features that are advantageous and should be retained, (ii) opportunities for improvements, and (iii) the research required to maximise the benefits from such improvements. The improvements considered include minor adjustments that leave ITS-90 intact, numerical adjustments to reference Resistance ratios that preserve the structure of ITS-90, fixed-point replacements, new subranges, and large-scale changes in the mathematical structure of the interpolations. A significant research effort will be required to implement some of the changes. Overall, an improvement in the thermodynamic accuracy by a factor of about 10 is relatively easily realised, but improvements in reproducibility of the scale of even a couple of tens of percent will be hard won. For most users, the costs and inconvenience of a substantial scale revision may outweigh the benefits.

Osamu Tamura - One of the best experts on this subject based on the ideXlab platform.

  • closed cycle joule thomson cryocooler for Resistance Thermometer calibration down to 0 65k
    International Journal of Thermophysics, 2008
    Co-Authors: Takeshi Shimazaki, K. Toyoda, Akihiro Oota, Hideaki Nozato, Takashi Usuda, Osamu Tamura
    Abstract:

    A closed-cycle Joule–Thomson cryocooler for Resistance Thermometer calibration has been developed. It consists of a Gifford–McMahon mechanical refrigerator and a closed-cycle 3He Joule–Thomson expansion circuit that utilizes the isenthalpic expansion of 3He for cooling. The developed cryocooler can reach temperatures as low as 0.6K and can operate for months with a simple procedure. The typical cooling power of the cryocooler is 1mW at 0.65K with a molar flow rate of 160μmol ·s−1 through the 3He Joule–Thomson circuit. The possible mechanical vibration level experienced by the Resistance Thermometers was measured with a laser vibrometer. It was confirmed that the maximum acceleration level is 0.1m· s−2 and will not cause a problem for Thermometer calibration.

  • Closed-Cycle Joule–Thomson Cryocooler for Resistance Thermometer Calibration down to 0.65K
    International Journal of Thermophysics, 2008
    Co-Authors: Takeshi Shimazaki, K. Toyoda, Akihiro Oota, Hideaki Nozato, Takashi Usuda, Osamu Tamura
    Abstract:

    A closed-cycle Joule–Thomson cryocooler for Resistance Thermometer calibration has been developed. It consists of a Gifford–McMahon mechanical refrigerator and a closed-cycle 3He Joule–Thomson expansion circuit that utilizes the isenthalpic expansion of 3He for cooling. The developed cryocooler can reach temperatures as low as 0.6K and can operate for months with a simple procedure. The typical cooling power of the cryocooler is 1mW at 0.65K with a molar flow rate of 160μmol ·s−1 through the 3He Joule–Thomson circuit. The possible mechanical vibration level experienced by the Resistance Thermometers was measured with a laser vibrometer. It was confirmed that the maximum acceleration level is 0.1m· s−2 and will not cause a problem for Thermometer calibration.

  • gifford mcmahon joule thomson cryocooler with high flow conductance counterflow heat exchanger for use in Resistance Thermometer calibration
    Review of Scientific Instruments, 2006
    Co-Authors: Takeshi Shimazaki, Keishi Toyoda, Osamu Tamura
    Abstract:

    A cryocooler that consists of a two-stage Gifford-McMahon (GM) mechanical refrigerator and a Joule-Thomson (JT) expansion circuit is developed for use in Resistance Thermometer calibration. The cryocooler is designed to attain a lower temperature rather than to produce a higher cooling power. A simple but high-performance counterflow heat exchanger is developed for the cryocooler. The heat exchanger has a high flow conductance while maintaining a high heat exchange efficiency. It is an improved type of counterflow heat exchanger composed of a spiral capillary and a thin-wall straight outer tube. The developed cryocooler uses a single counterflow heat exchanger not like a conventional GM/JT cryocooler, which usually has two or three counterflow heat exchangers. He4 is used as the working fluid for the JT expansion circuit. The pot where the condensed He4 collects after the JT expansion can reach 1.3K in the continuous operation mode and 1.0K in the single-cycle operation mode. The cooling power of the cryo...

  • rhodium iron Resistance Thermometer with fused silica coil frame
    Cryogenics, 1991
    Co-Authors: Osamu Tamura, H Sakurai
    Abstract:

    Abstract The dependences of the thermometric properties of a rhodium - iron (RhFe) (mole fraction 0.5%) wire Resistance Thermometer on the annealing temperature between 700 and 900°C are investigated using fused-silica coil frames. The Thermometers annealed at or above 800°C have similar temperature - Resistance characteristics. These Thermometers can be calibrated with an accuracy of 0.5 mK over the range 4.2–25 K using a reference temperature - Resistance function and three calibration points. RhFe wire Thermometers from different origins can be calibrated with an accuracy of the order of 10 mK in the same way. The temperature rise of the present Thermometers due to heating by the measuring current is in a reasonable range for thermometry with a millikelvin accuracy.

Rajeshuni Ramesham - One of the best experts on this subject based on the ideXlab platform.

  • Qualification Testing of Engineering Camera and Platinum Resistance Thermometer (PRT) Sensors for Mars Science Laboratory (MSL) Project under Extreme Temperatures to Assess Reliability and to Enhance Mission Assurance
    2015
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package Qualification and Verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (Engineering Camera and Platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight-like packages, sensors, and subassemblies have been selected for the study to survive three times (3x) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance due to either overstress or thermal cycle fatigue. Experiments of flight like hardware qualification test results have been described in this paper. Key words: Engineering camera, platinum Resistance Thermometer, hardware qualification

  • qualification testing of engineering camera and platinum Resistance Thermometer prt sensors for msl project under extreme temperatures to assess reliability and to enhance mission assurance
    Journal of microelectronics and electronic packaging, 2009
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package qualification and verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (engineering camera and platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight-like packages, sensors, and subassemblies have been selected for the study to survive three times (3×) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations, and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance du...

  • qualification testing of engineering camera and platinum Resistance Thermometer prt sensors for mars science laboratory msl project under extreme temperatures to assess reliability and to enhance mission assurance
    Proceedings of SPIE the International Society for Optical Engineering, 2008
    Co-Authors: Rajeshuni Ramesham, J. N. Maki, Gordon C Cucullu
    Abstract:

    Package Qualification and Verification (PQV) of advanced electronic packaging and interconnect technologies and various other types of qualification hardware for the Mars Exploration Rover/Mars Science Laboratory flight projects has been performed to enhance the mission assurance. The qualification of hardware (Engineering Camera and Platinum Resistance Thermometer, PRT) under extreme cold temperatures has been performed with reference to various project requirements. The flight- like packages, sensors, and subassemblies have been selected for the study to survive three times (3×) the total number of expected temperature cycles resulting from all environmental and operational exposures occurring over the life of the flight hardware including all relevant manufacturing, ground operations and mission phases. Qualification has been performed by subjecting above flight-like qual hardware to the environmental temperature extremes and assessing any structural failures or degradation in electrical performance due to either overstress or thermal cycle fatigue. Experiments of flight like hardware qualification test results have been described in this paper.