Thermal Investigations on CMOS Integrated Micro-Hot-Plates Using IR Thermography

2012 ◽  
Author(s):  
Christian Schmidt ◽  
Frank Altmann ◽  
Giorgio C. Mutinati ◽  
Elise Brunet ◽  
Stephan Steinhauer ◽  
...  
Keyword(s):  
Thermal Behaviour ◽  
Absolute Temperature ◽  
Temperature Measurements ◽  
Coating Process ◽  
Ir Thermography ◽  
Black Paint ◽  
Paint Coating ◽  
Thermal Investigations

Abstract In this paper, investigations on absolute temperature measurements using IR-Thermography of CMOS integrated micro-hot-plates (μHP) are presented. The results of using two different approaches, emissivity correction and black paint coating, are presented and compared with respect to simulation and electrical testing results. In addition, FIB/SEM investigations were used for surface investigations and determination of possible influences to the thermal behaviour by black paint coating process.

scholarly journals Effect of Strain on Heating Characteristics of Silicone/CNT Composites

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4528
Author(s):  
Minoj Gnanaseelan ◽  
Kristin Trommer ◽  
Maik Gude ◽  
Rafal Stanik ◽  
Bartlomiej Przybyszewski ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrical Properties ◽  
Thermal Behaviour ◽  
Electric Potential ◽  
Low Voltage ◽  
Coating Process ◽  
Ir Camera ◽  
Drastic Effect ◽  
Morphological Investigations

In this work, silicone/carbon nanotube (CNT) composites were produced using a spread coating process, followed by morphological investigations and determination of their electrical properties and heating behaviour through the application of electric potential. Composites containing varying amounts of CNT (1–7%) were investigated for their thermal behaviour with the use of an IR camera. Subsequently, thermal behaviour and electrical properties were measured when the samples were stretched (up to 20%). With the 7% CNT composites, which had a conductivity of 106 S/m, it was possible to achieve a temperature of 155 °C at a relatively low voltage of 23 V. For high CNT contents, when the potential was controlled in such a way as to maintain the temperature well below 100 °C, the temperature remained almost constant at all levels of strain investigated. At higher potentials yielding temperatures around 100 °C and above, stretching had a drastic effect on temperature. These results are critical for designing composites for dynamic applications requiring a material whose properties remain stable under strain.

Performance enhancement of solar vortex power generator by Al2O3-in-black paint coating

2021 ◽  
pp. 128303
Author(s):  
Hussain H. Al-Kayiem ◽  
Ali A. Ismaeel ◽  
Aklilu T. Baheta ◽  
Mohammed A. Aurybi
Keyword(s):  
Performance Enhancement ◽  
Black Paint ◽  
Power Generator ◽  
Paint Coating

scholarly journals Temperature Gradient Measurements in Hydrothermal Areas of Georgia

2018 ◽  
Vol 1 (1) ◽  
pp. 14-17
Author(s):  
Andreas Weller ◽  
Sepehr Sangin ◽  
Günter Buntebarth ◽  
George Melikadze
Keyword(s):  
Temperature Field ◽  
Fluid Flows ◽  
Temperature Measurements ◽  
Resolving Power ◽  
The Caucasus ◽  
Caucasus Region ◽  
Different Depths ◽  
Subsurface Fluid ◽  
Gradient Measurements

The project uses results of temperature measurements in shallow boreholes to determine the geothermal gradients for a selected set of wells in Georgia. The hydrothermal flow in the Caucasus region driven by ongoing tectonic activities causes a varying temperature field that impedes determination of stable temperature gradients. Conventional temperature logging provides only a snapshot of the temperature distribution in a well. Therefore, the methodology adopted in this study is based on continuous stationary measurements with up to eight temperature sensors fixed at different depths in the wells. Temperature measurements have been performed in 14 wells using thermometers with resolving power of 0.01 K. The temperature field was recorded during periods ranging from 16 hours to 4 days. This practice of measurements enabled detection of thermal effects of fluid flows within the selected set of boreholes. Considering the 14 wells that were selected for this study, eight showed signs of stability in temperature increase versus depth and the remaining seven wells revealed signs of instability due subsurface fluid flows.

Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)

Holzforschung ◽  
2016 ◽  
Vol 70 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Julia K. Denzler ◽  
Andreas Weidenhiller
Keyword(s):  
Nondestructive Testing ◽  
Moisture Content ◽  
Industrial Application ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
The State ◽  
Temperature Measurements ◽  
Unfrozen Water ◽  
State Of Matter

AbstractThe possibility for pre-grading of logs throughout the year has been evaluated based on dynamic modulus of elasticity (MOEdynor simplifiedEdyn) by means of frequency-based nondestructive testing (NDTfreq). The challenge is thatEdynis variable in the frozen, partly frozen, and unfrozen states of logs (state of matter). In the unfrozen state, NDTfreqis reliable if the moisture content does not fall below fiber saturation. The state of the matter was tested via temperature measurements of air and log by means of an infrared technique and sensors, and information was evaluated from NDTfreq. The temperature measurements proved to be inefficient for industrial application because of unreliable data and long measurement times, whereas the NDTfreqmeasurements allowed the determination of meaningful damping factors. A sufficient level of predictability for more than 60% of the measurements was found. The log measurements in the partly frozen state are inconclusive becauseEdyndata fluctuate in the presence of both liquid and frozen water. For the completely frozen logs, a correction is introduced as a precaution that avoids an overestimation ofEdynin the unfrozen state.

scholarly journals Multinuclear absolute magnetic resonance thermometry

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Emilia V. Silletta ◽  
Alexej Jerschow ◽  
Guillaume Madelin ◽  
Leeor Alon
Keyword(s):  
Magnetic Resonance ◽  
Ex Vivo ◽  
Absolute Temperature ◽  
Main Magnetic Field ◽  
Relative Temperature ◽  
Temperature Changes ◽  
Non Invasive ◽  
Mouse Tissues ◽  
Infrared Measurements

AbstractNon-invasive measurement of absolute temperature is important for proper characterization of various pathologies and for evaluation of thermal dose during interventional procedures. The proton (hydrogen nucleus) magnetic resonance (MR) frequency shift method can be used to map relative temperature changes. However, spatiotemporal variations in the main magnetic field and the lack of local internal frequency reference challenge the determination of absolute temperature. Here, we introduce a multinuclear method for absolute MR thermometry, based on the fact that the hydrogen and sodium nuclei exhibit a unique and distinct characteristic frequency dependence with temperature and with electrolyte concentration. A one-to-one mapping between the precession frequency difference of the two nuclei and absolute temperature is demonstrated. Proof-of-concept experiments were conducted in aqueous solutions with different NaCl concentrations, in agarose gel samples, and in freshly excised ex vivo mouse tissues. One-dimensional chemical shift imaging experiments also demonstrated excellent agreement with infrared measurements.

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