LOW TEMPERATURE CHARACTERISTIC OF GaAlAs TEMPERATURE SENSOR DIODE

2001 ◽  
Vol 15 (09n10) ◽  
pp. 319-322 ◽  
Author(s):  
SNEHADRI BIHARI OTA ◽  
JUAN BASCUÑÁN ◽  
SMITA OTA
Keyword(s):  
Low Temperature ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Low Temperatures ◽  
Temperature Characteristic ◽  
Lake Shore ◽  
Temperature Range

We have measured the forward characteristics of a GaAlAs temperature sensor diode (Lake Shore) in the temperature range 10–70 K and for fixed current values between 10 nA to 500 μA. On the basis of certain extrapolations, we suggest that these diodes can be used for temperature measurement at at ultra low temperatures.

THERMOMETRY BETWEEN 10–300 K USING GaAlAs DIODE

2000 ◽  
Vol 14 (11) ◽  
pp. 393-399 ◽  
Author(s):  
S. B. OTA ◽  
SMITA OTA
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Power Law ◽  
Temperature Sensor ◽  
Lake Shore ◽  
Temperature Range

The forward characteristics of a cryogenic GaAlAs temperature sensor diode (Lake Shore Cryotronics, Inc.) have been presented in the temperature range 10–300 K and for fixed current values between 10 nA and 500 μA. The upturn in the forward characteristic below 35 K was found to shift to lower temperatures by reducing the current. The sensitivity at low temperature was found to reduce with current (I) according to a power law. The sensitivity at high temperature was found to increase linearly with decrease in lg (I).

A temperature sensor based on flexible substrate with ultra-high sensitivity for low temperature measurement

2020 ◽  
Vol 315 ◽  
pp. 112341
Author(s):  
Zhaojun Liu ◽  
Bian Tian ◽  
Xu Fan ◽  
Jiangjiang Liu ◽  
Zhongkai Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Flexible Substrate ◽  
High Sensitivity

PERSISTENT PHOTOCONDUCTIVITY IN La0.7CaxBa1-xMnO3 THIN FILMS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3786-3791 ◽  
Author(s):  
R. CAURO ◽  
J. C. GRENET ◽  
A. GILABERT ◽  
M. G. MEDICI
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Visible Light ◽  
Low Temperatures ◽  
Transport Mechanism ◽  
Persistent Photoconductivity ◽  
Temperature Range ◽  
Insulator Metal Transition ◽  
First Time

We report, for the first time, experiments of persistent photoconductivity (PPC) in thin films of manganese perovskites La 0.7 Ca 0.25 Ba 0.05 MnO 3 and La 0.7 Ca 0.2 Ba 0.1 MnO 3 showing a persistent decrease of a few percent of the resistance after illumination with visible light. These persistent photoinduced effects are seen only in a range of low temperatures (<25 K) well below the insulator-metal transition at respectively T c=173 K and T c=120 K. In this low temperature range, the transport mechanism is rather of activated hopping type regime.

The ferromagnetic domain structure of haematite

1968 ◽  
Vol 303 (1475) ◽  
pp. 525-529 ◽  
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
Domain Structure ◽  
Low Temperatures ◽  
Remanent Magnetization ◽  
Temperature Transition ◽  
Small Temperature ◽  
Temperature Range ◽  
Ferromagnetic Domain ◽  
Synthetic Crystals

Observations are reported of the ferromagnetic domain structure of natural and synthetic single crystals, made at temperatures close to the low temperature transition with the aid of an acetone based magnetic colloid. The domain structure of the synthetic crystals was found to change radically over a small temperature range centred around –12 °C. These changes are correlated with the measured remanent magnetization. Fairly extensive colloid patterns were found on the natural crystals at low temperatures but when the natural crystals were annealed at 1200 °C this low temperature colloid structure was no longer found.

Thermogravimetric study of sequential carbonation and decarbonation processes over Na2ZrO3 at low temperatures (30–80 °C): relative humidity effect

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66579-66588 ◽  
Author(s):  
J. Arturo Mendoza-Nieto ◽  
Heriberto Pfeiffer
Keyword(s):  
Solid State ◽  
Relative Humidity ◽  
Low Temperature ◽  
Low Temperatures ◽  
Humidity Effect ◽  
Temperature Range ◽  
Thermogravimetric Study ◽  
Relative Humidity Effect

Na2ZrO3 was synthetized via solid-state and tested in a low temperature range (30–80 °C) for carbonation and decarbonation processes using RH values between 0 and 80%. Results confirm that it is possible to accomplish successively at least 8 cycles.

Notizen: Low Temperature Magnetic Susceptibility of Sm2(WO4)3

1975 ◽  
Vol 30 (12) ◽  
pp. 1783-1784 ◽  
Author(s):  
H.B. Lal ◽  
Naseeb Dar
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Crystal Field ◽  
Low Temperatures ◽  
Magnetic Ordering ◽  
Magnetic Exchange ◽  
Temperature Range ◽  
Powder Samples

Abstract The magnetic susceptibility of powder samples of Sm2(WO4)3 has been measured in the temperature range 4.2 to 300 K. At low temperatures the measured values disagree with those calculated for Sm3+-ions using Van Vleck's theory. The high values below 100 K are assigned to magnetic exchange and dipol interactions. There might be magnetic ordering below 4.2 K. The effects of the crystal field and impurities have been shown to be unimportant.

Performance of 4H-SiC Bipolar Diodes as Temperature Sensor at Low Temperatures

2019 ◽  
Vol 963 ◽  
pp. 572-575
Author(s):  
Luigi di Benedetto ◽  
C.D. Matthus ◽  
Tobias Erlbacher ◽  
Anton Bauer ◽  
Gian Domenico Licciardo ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Low Temperatures ◽  
Maximum Error ◽  
Temperature Range ◽  
Bipolar Diodes ◽  
Full Temperature ◽  
Diode Voltage ◽  
Very High ◽  
Diode Current ◽  
Operating Temperature Range

In this paper we report on the performance of 4H-SiC bipolar diodes as temperature sensors far beyond 273K. The sensor is measured from 150K to 445K covering a temperature range of 295K. In this operating temperature range, the sensor characteristic VD-T is highly linear and it is dominated by the typical dependence of the p-i-n diode voltage on the temperature. The sensor sensitivity is -4.48mV/K for a diode current of 2nA with a maximum error of 4.3K across the full temperature range. Although 4H-SiC p-i-n are mainly focused on very high temperature applications, our analysis on the performance of bipolar diodes at low temperatures highlights its feasibility as temperature sensor for aerospace and high altitude applications where cryogenic temperatures are achieved.

Thermally Stimulated Conductivity in a-Si:H at low Temperatures

1994 ◽  
Vol 336 ◽  
Author(s):  
M. Zhu ◽  
M.B. Von Der Linden ◽  
W.F. Van Der Weg
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Low Temperatures ◽  
Thermal Emission ◽  
Temperature Peak ◽  
Band Tail ◽  
Emission Energy ◽  
Temperature Range ◽  
Multiple Trapping ◽  
Peak Value

ABSTRACTThe low temperature thermally stimulated conductivity (TSC) in a-Si:H film has been investigated in the temperature range from 20 to 150 K. Unlike the results of the high temperature TSC, the low temperature peak value and position (Tm) of TSC do not depend on the starting temperature T0 at low temperatures. This new phenomenon can not be explained by TSC theory [1]. Based on the multiple trapping (MT) Model, TSC theory limits its application to the intermediate and high temperature range. In this paper, a model of the hopping conduction with the transport energy Et in the band tail is proposed to understand the behavior of the low temperature TSC in which the thermal emission energy Em does not depend on the starting temperature of TSC.

scholarly journals Drosophila beta-Tubulin 97EF is upregulated at low temperature and stabilizes microtubules

2017 ◽  
Author(s):  
Faina Myachina ◽  
Fritz Bosshardt ◽  
Johannes Bischof ◽  
Moritz Kirschmann ◽  
Christian F. Lehner
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Molecular Mechanisms ◽  
Specific Pattern ◽  
Beta Tubulin ◽  
Tissue Specific ◽  
Temperature Range ◽  
Microtubule Stability ◽  
Cold Sensitive ◽  
Summary Statement

Summary statementEctotherms thrive within an often remarkable temperature range. At low temperature, betaTub97EF, a beta-tubulin paralog stabilizing microtubules, is upregulated in a tissue-specific manner in the fly Drosophila melanogaster.AbstractCells in ectotherms function normally within an often wide temperature range. As temperature dependence is not uniform across all the distinct biological processes, acclimation presumably requires complex regulation. The molecular mechanisms coping with the disruptive effects of temperature variation are still poorly understood. Interestingly, one of five different beta-tubulin paralogs, betaTub97EF, was among the genes up-regulated at low temperature in cultured Drosophila cells. As microtubules are known to be cold-sensitive, we analyzed whether betaTub97EF protects microtubules at low temperatures. During development at the optimal temperature (25°C), betaTub97EF was expressed in a tissue-specific pattern primarily in the gut. There, as well as in hemocytes, expression was increased at low temperature (14°C). While betaTub97EF mutants were viable and fertile at 25°C, their sensitivity within the well-tolerated range was slightly enhanced during embryogenesis specifically at low temperatures. Changing beta-tubulin isoform ratios in hemocytes demonstrated that beta-Tubulin 97EF has a pronounced microtubule stabilizing effect. Moreover, betaTub97EF is required for normal microtubule stability in the gut. These results suggest that betaTub97EF up-regulation at low temperature contributes to acclimation by stabilizing microtubules.

Research on the Surface Acoustic Wave Temperature Sensor

2014 ◽  
Vol 543-547 ◽  
pp. 1266-1269 ◽  
Author(s):  
Kun Zhang ◽  
Wen Di Wang ◽  
Zhao Mei Qiu
Keyword(s):  
Acoustic Wave ◽  
Temperature Measurement ◽  
Surface Acoustic Wave ◽  
Temperature Sensor ◽  
Measurement Accuracy ◽  
Temperature Characteristic ◽  
Experimental Results ◽  
Testing Unit ◽  
Saw Sensor ◽  
Frequency Temperature

This paper puts forward an idea of designing a surface acoustic wave (SAW) sensor to provide a research basis for subsequent researchers. We have made a SAW temperature sensor based on this idea. The experimental results demonstrated the feasibility of the idea, and shown that the frequency-temperature characteristic of the sensing unit is good and the temperature measurement accuracy of the testing unit is high.

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