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V. F. Mitin - One of the best experts on this subject based on the ideXlab platform.

  • Cryogenic Resistance Thermometers based on Ge–InP films
    Технология и конструирование в электронной аппаратуре, 2020
    Co-Authors: V. F. Mitin, V. V. Kholevchuk, E. A. Soloviev, A. B. Sidnev, E.f. Venger
    Abstract:

    Despite the large number of scientific articles devoted to the development of cryogenic Resistance Thermometers, not many of these Thermometers are mass-produced. As is know, semiconductor resistive temperature sensors have low magnetoResistance and high Resistance to radiation. The purpose of this work was to manufacture thin (170—190 nm) Ge films on semi-insulating InP substrates, which can be used to create cryogenic Resistance Thermometers with high temperature sensitivity and relatively low sensitivity to magnetic field that can operate in the 1.5—400 К temperature range. Films of Ge on InP (100) can be used to produce cryogenic Resistance Thermometers. They have good thermal sensitivity and relatively low magnetoResistance. The films were produced by thermal evaporation of Ge in vacuum (2•10-4 Pa) on semi-insulating InP (100) substrates. The temperature of the InP substrate during film deposition was 310°C, the deposition rate was also constant during sputtering, but varied in the range of 0.03 to 0.06 nm/s for different films. Ge films were p-type conductivity with a resistivity of 0.2—0.3 Ω•cm, hole concentration (3—5)•1018 cm–3 and Hall mobility 6.5—7.5 сm2/(V•s) at room temperature. The quality of the Ge–InP heterostructure was determined by high-resolution X-ray diffraction on a Philips MRD diffractometer. The nanomorphology of the surface of Ge films was studied using the NanoScope IIIa atomic force microscope. The crystal structure of the films is amorphous or polycrystalline with a low level of structural perfection. The effective value of the surface roughness is from 2.25 to 2.60 nm. The obtained Resistance values at different temperature in the range of 2—25 K were described by exponential dependence. Corrections in temperature measurement are 5% in a magnetic field of 11 T at a temperature of 4.2 K and 14% in a magnetic field of 14 T at a temperature of 2.2 K. The research results indicate that the obtained films can be used to measure cryogenic temperatures in magnetic fields of up to 14 T.

  • ge on gaas film Resistance Thermometers for cryogenic applications
    Cryogenics, 2007
    Co-Authors: V. F. Mitin, N.s. Boltovets, V. V. Kholevchuk, P C Mcdonald, F Pavese, Yu I Nemish, V V Basanets, V K Dugaev, P V Sorokin, R V Konakova
    Abstract:

    Abstract Our paper discusses and reviews the properties of a range of semiconductor sensors, which have been developed for thermometry in cryogenic applications. The range of sensors developed includes a family of single and dual element Resistance Thermometers based on Ge-on-GaAs films. The thin film devices were produced using standard semiconductor processing techniques and provide high device sensitivity within the range 0.03–500 K. The construction and characteristics of the sensors are presented together with a discussion of their sensitivities to magnetic fields and ionising radiation.

  • conduction and magnetoResistance mechanisms in germanium films used for low temperature Resistance Thermometers
    LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24, 2006
    Co-Authors: V. F. Mitin, V K Dugaev, G G Ihas
    Abstract:

    We present the investigation of conductance and magnetoResistance mechanism of Ge‐on‐GaAs films used for low‐temperature Resistance Thermometers. At temperature below 10 K the main mechanism of conductivity in Ge films is the variable‐range hopping. At low temperatures the magnetoResistance can be negative, and its magnitude increases with decreasing temperature. A new giant negative magnetoResistance effect in Ge films at ultralow temperature (T <0.2 K) and low magnetic fields (H < 1 T) has been observed. This effect is very sensitive to temperature. At 0.03 K the Ge film Resistance decreases up to 100 times for H = 1 Tesla. The effect saturates for fields above 1 Tesla. We discuss the physics of this phenomenon and present the results of calculation using a development of the hopping theory of conductivity with the localization corrections.

  • new generation of Resistance Thermometers based on ge films on gaas substrates
    TEMPERATURE: Its Measurement and Control in Science and Industry; Volume VII; Eighth Temperature Symposium, 2003
    Co-Authors: N.s. Boltovets, V. F. Mitin, V. V. Kholevchuk, P C Mcdonald, F Pavese, Yu I Nemish, V K Dugaev, P V Sorokin, I Peroni, E. A. Soloviev
    Abstract:

    Recent results in the development of Resistance Thermometers based on germanium films on gallium arsenide are summarized. Preliminary results in the development of a new generation of radiation-resistant Thermometers and multifunction sensors intended for use in the range 0.03 to 500 K in the presence of high magnetic fields are discussed. These sensors have been produced in an international collaboration recently funded through the EU INTAS program.

  • Resistance Thermometers based on the germanium films
    Semiconductor Physics Quantum Electronics and Optoelectronics, 1999
    Co-Authors: V. F. Mitin
    Abstract:

    The latest achievements in the field of development of Resistance Thermometers based on the germanium films on gallium arsenide are presented and summarized. Basic models of Ge film Thermometers, which cover the temperature range from 0.02 to 500 K, are considered. Character- istics of the Thermometers in high magnetic fields and under the action of ionizing irradiation (neutrons and gamma-rays) are presented.

Y. Tretyakov - One of the best experts on this subject based on the ideXlab platform.

Syuntaro Takasu - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of Standard Capsule-Type PtCo Resistance Thermometers Between 0.65 K and 25 K
    International Journal of Thermophysics, 2017
    Co-Authors: Tomomi Shimazaki, T Nakano, Syuntaro Takasu
    Abstract:

    Standard capsule-type platinum–cobalt (PtCo) Resistance Thermometers represent one of the few types of Resistance Thermometers that have been developed for precise thermometry in the cryogenic temperature range. These Thermometers remain sensitive even at 0.65 K, which is the lower limit of the ITS-90. Standard capsule-type rhodium–iron (RhFe) Resistance Thermometers are another type of Resistance thermometer intended for use in this temperature range and have been well characterized and are the de facto standard worldwide. Existing data show RhFe Resistance Thermometers are more reproducible than the corresponding PtCo Resistance thermometer. However, it has become difficult to obtain brand-new standard capsule-type RhFe Resistance Thermometers since their production was discontinued in the early 2000s. Unfortunately, information regarding the characteristics of standard capsule-type PtCo Resistance Thermometers is limited compared to that available for RhFe Resistance Thermometers. In this study, the characteristics of two standard capsule-type PtCo Resistance Thermometers between 0.65 K and 25 K were investigated. Because the Resistance versus temperature curves for these Thermometers over this temperature range exhibit two inflection points, setting break points near each of the inflection points was found to be beneficial during polynomial curve fitting to obtain mK-level precision. Special attention was paid to the reproducibility of these Thermometers, and it was observed that the reproducibility of one of the Thermometers within the cryogenic temperature range was ±0.5 mK over 6 years, while the second thermometer showed a larger variation. Similar trends in the Resistance characteristics of the two Thermometers were observed at the triple point of water.

  • Characteristics of Standard Capsule-Type PtCo Resistance Thermometers Between 0.65 K and 25 K
    International Journal of Thermophysics, 2017
    Co-Authors: Takeshi Shimazaki, T Nakano, Syuntaro Takasu
    Abstract:

    Standard capsule-type platinum–cobalt (PtCo) Resistance Thermometers represent one of the few types of Resistance Thermometers that have been developed for precise thermometry in the cryogenic temperature range. These Thermometers remain sensitive even at 0.65 K, which is the lower limit of the ITS-90. Standard capsule-type rhodium–iron (RhFe) Resistance Thermometers are another type of Resistance thermometer intended for use in this temperature range and have been well characterized and are the de facto standard worldwide. Existing data show RhFe Resistance Thermometers are more reproducible than the corresponding PtCo Resistance thermometer. However, it has become difficult to obtain brand-new standard capsule-type RhFe Resistance Thermometers since their production was discontinued in the early 2000s. Unfortunately, information regarding the characteristics of standard capsule-type PtCo Resistance Thermometers is limited compared to that available for RhFe Resistance Thermometers. In this study, the characteristics of two standard capsule-type PtCo Resistance Thermometers between 0.65 K and 25 K were investigated. Because the Resistance versus temperature curves for these Thermometers over this temperature range exhibit two inflection points, setting break points near each of the inflection points was found to be beneficial during polynomial curve fitting to obtain mK-level precision. Special attention was paid to the reproducibility of these Thermometers, and it was observed that the reproducibility of one of the Thermometers within the cryogenic temperature range was ±0.5 mK over 6 years, while the second thermometer showed a larger variation. Similar trends in the Resistance characteristics of the two Thermometers were observed at the triple point of water.

M. Arai - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of small sized platinum Resistance Thermometers with its 90 characteristics
    International Journal of Thermophysics, 2011
    Co-Authors: K Yamazawa, Jun Tamba, J V Widiatmo, K Anso, M. Arai
    Abstract:

    Many platinum Resistance Thermometers (PRTs) are applied for high precision temperature measurements in industry. Most of the applications use PRTs that follow the industrial standard of PRTs, IEC 60751. However, recently, some applications, such as measurements of the temperature distribution within equipments, require a more precise temperature scale at the 0.01 °C level. In this article the evaluation of remarkably small-sized PRTs that have temperature–Resistance characteristics very close to that of standard PRTs of the International Temperature Scale of 1990 (ITS-90) is reported. Two types of the sensing element were tested, one is 1.2 mm in diameter and 10 mm long, the other is 0.8 mm and 8 mm. The Resistance of the sensor is 100 Ω at the triple-point-of-water temperature. The Resistance ratio at the Ga melting-point temperature of the sensing elements exceeds 1.11807. To verify the closeness of the temperature–Resistance characteristics, comparison measurements up to 157 °C were employed. A pressure-controlled water heat-pipe furnace was used for the comparison measurement. Characteristics of 19 Thermometers with these small-sized sensing elements were evaluated. The deviation from the temperature measured using a standard PRT used as a reference thermometer in the comparison was remarkably small, when we apply the same interpolating function for the ITS-90 sub-range to these small Thermometers. Results including the stability of the PRTs and the uncertainty evaluation of the comparison measurements, and the comparison results showing the small deviation from the ITS-90 temperature–Resistance characteristics are reported. The development of such a PRT might be a good solution for applications such as temperature measurements of small objects or temperature distribution measurements that need the ITS-90 temperature scale.

  • Evaluation of transfer standard platinum Resistance Thermometers using pressure-controlled cesium heat pipe
    SICE 2003 Annual Conference (IEEE Cat. No.03TH8734), 2003
    Co-Authors: Jun Tamba, I. Kishimoto, M. Arai
    Abstract:

    A comparison furnace using a pressure-controlled cesium heat pipe was developed and its characteristics were investigated experimentally. The heat pipe has five wells by which five platinum Resistance Thermometers can be compared simultaneously. Good temperature stability of 0.078 mK was achieved at 660/spl deg/C and good temperature uniformity of 0.28 mK over a zone of 4 cm was obtained at 520/spl deg/C. Using this furnace, thermometer comparison at the uncertainty of 1 mK or so in the range from 395/spl deg/C to 660/spl deg/C can be expected. Transfer standard platinum Resistance Thermometers, which have been developed in our laboratory, would be compared with an ordinary standard platinum Resistance thermometer to evaluate their characteristics.

  • development of a stable transfer standard thermometer i evaluation of vibration damage on standard platinum Resistance Thermometers
    Society of Instrument and Control Engineers of Japan, 2002
    Co-Authors: I. Kishimoto, M. Arai, H Narushima, Akiyoshi Kawata
    Abstract:

    It is well known that standard platinum Resistance Thermometers (SPRTs) are delicate against mechanical shock and vibration. This delicacy causes Resistance instability that is one of the most effective factors of uncertainty in precise measurement, such as the fixed point comparison. Development of a mechanically-stable SPRT reduces this uncertainty. As a preliminary experiment, we evaluated mechanical characteristic of existing types of SPRT.

  • stability of high temperature platinum Resistance Thermometers above 962 spl deg c up to 1200 spl deg c
    Society of Instrument and Control Engineers of Japan, 2002
    Co-Authors: M. Arai, A Kawata
    Abstract:

    The present status of new types of high-temperature platinum Resistance Thermometers (HTPRT), platinum sheath type and alumina sheath type, is reported. The result indicate that the platinum sheath type are stable up to 1170/spl deg/C. The alumina sheath type also showed a good long-term stability at 1100/spl deg/C and 1170/spl deg/C. The result indicates that the HTPRTs developed in this investigation are applicable at temperatures above 962/spl deg/C up to 1170/spl deg/C.

A. Bajtsar - One of the best experts on this subject based on the ideXlab platform.