Experimental study on supersonic combustion fluctuation using thin-film thermocouple and time–frequency analysis

Jin, Xinhang; Tian, Ye; Zhao, Keli; Ma, Binghe; Deng, Jinjun; Luo, Jian

doi:10.1016/j.actaastro.2020.09.041

Cited by 14 publications

(13 citation statements)

References 32 publications

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“…Therefore, the subsequent PCA model will characterize the dissimilarities between trajectories and will identify those ones slightly different from the rest. Time-frequency analysis is another well-researched domain for the classification of sensor data [ 45 , 46 , 47 ]. Another approach is to extract parameters from the time series and apply classification methods [ 6 , 66 ].…”

Section: Resultsmentioning

confidence: 99%

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Multivariate Characterization of Temperature Fluctuations in a Historical Building Using Energy-Efficient IoT Wireless Sensors

Zarzo

Perles

Mercado

et al. 2021

Sensors

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Adequate thermic conditions are required for the preventive conservation of artworks, but such optimum conditions cannot always be achieved in historical buildings such as ancient churches. In those cases, it is of interest to assess the potential risk of punctual changes in indoor environments that can be harmful to artworks. These conditions can be assessed by means of a microclimate monitoring system comprised of a set of energy-efficient wireless sensors connected to the cloud using IoT techniques. This approach was followed at the baroque church of Saint Thomas and Saint Philip Neri in Valencia (Spain). A set of 26 wireless nodes was installed, which recorded values of temperature and relative humidity every hour for a period of 7 months. Small differences of temperature were obtained among sensors, so that an efficient methodology based on principal component analysis (PCA) was applied for the characterization of similarities and dissimilarities between sensors. Daily ranges of temperatures were studied as well as mean trajectories, differences between days of the week, and changes in the correlation structure of daily median values over time. Results provide a framework for an efficient characterization of temperatures in heritage buildings based on a network of wireless sensors. Such a framework is useful to assess the potential risk of temperature fluctuations on the preventive conservation of historical buildings and artworks.

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Section: Resultsmentioning

confidence: 99%

“…Both statistical tools have demonstrated a challenging capability for classifying time series with very similar patterns and for optimizing the number of sensors required to monitor the indoor air conditions in museums. Time-frequency analysis is another well-researched domain for the classification of sensor data [ 45 , 46 , 47 ].…”

Section: Introductionmentioning

confidence: 99%

Multivariate Characterization of Temperature Fluctuations in a Historical Building Using Energy-Efficient IoT Wireless Sensors

Zarzo

Perles

Mercado

et al. 2021

Sensors

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“…High-temperature monitoring in confined spaces, such as a combustion chamber of an engine, applies harsh requirements on thermosensitive parts [ 1 , 2 , 3 , 4 , 5 ]. Compared to conventional wire and foil thermocouples, thin film thermocouple (TFTC) by microelectromechanical system (MEMS) process has the advantages of fast response speed and small size due to its low thermal mass and process [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Horizontal Oxidation Diffusion Behavior of MEMS-Based Tungsten-Rhenium Thin Film Thermocouples

et al. 2022

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Tungsten-rhenium thin film thermocouples (TFTCs) are well suited for the surface temperature monitoring of hot components due to their small size, rapid response and low cost. In this study, a tungsten-rhenium TFTC with SiC protective film on all parts except the pads was fabricated by a microelectromechanical system (MEMS) process. During the low to medium temperature (−40 °C to 500 °C) repeatability test phase, the thermal voltage from the TFTC agreed well with that of the standard tungsten-rhenium thermocouple. However, during the high temperature test phase, the TFTC lost electronic response at around 620 °C. Failure analysis of the TFTC tested at 620 °C was performed by microscopy, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), laser scanning confocal microscope (LSCM) and statistics. The results showed that the pads were oxidized without the protective layer, the number of oxidized protrusions distributed in this TFTC from the pad to the node decreases more and more slowly and the size of the oxidized protrusions also becomes smaller and smaller. This demonstrates the presence of horizontal oxidation diffusion in TFTCs, further illustrating the importance of pad protection and provides a direction for the subsequent structural optimization and the extension of the service life of TFTCs and other sensors.

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“…Miniaturized thin film thermocouples (TFTCs) are critical for surface temperature measurements of hot components in high temperature environments, such as inner wall and tail nozzle of scramjet (supersonic combustion ramjet) [1,2], turbine engine combustion inner wall and turbine blades [3][4][5], piston top and cylinder head of direct injection diesel engine [6]. In application involving temperature sensing of small, smooth surface areas, such as turbine blades, TFTCs are usually deposited directly on the component surface and integrated with the component [5].…”

Section: Introductionmentioning

confidence: 99%

Flexible miniaturized thin film thermocouples arrays for high temperature applications

Liu

Jiang

Zhao

et al. 2022

J. Phys.: Conf. Ser.

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Thin film thermocouples (TFTCs) are critical for surface temperature measurements of hot components in high temperature environments. In this paper, miniaturized Pt/Pt-10%Rh thin film thermocouple arrays were fabricated on flexible Hastelloy substrates by magnetron sputtering. The morphology and microstructure of Al2O3/Y2O3 insulating films were investigated by a field-emission scanning electron microscope with an energy dispersive X-ray spectroscopy system. The thermoelectric performance of the TFTCs arrays was investigated by cyclic calibration and bending tests. During the whole calibration process, the average maximum temperature differences (ΔT′ ) of measuring points 2, 3, and 4 are 637 °C, 617 °C, and 574 °C, respectively, which differ from the maximum temperature difference (ΔT max ) of measuring point 1 by -13 °C, -34 °C, and -76 °C, respectively. The calibration results show that each single measuring point has good repeatability and stability during the five calibration processes, and the temperature difference between multiple measuring points is obvious, stable and reliable. The thermoelectric properties of the thin film thermocouple arrays barely change after 10,000 cyclic bending tests.

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Experimental study on supersonic combustion fluctuation using thin-film thermocouple and time–frequency analysis

Cited by 14 publications

References 32 publications

Multivariate Characterization of Temperature Fluctuations in a Historical Building Using Energy-Efficient IoT Wireless Sensors

Multivariate Characterization of Temperature Fluctuations in a Historical Building Using Energy-Efficient IoT Wireless Sensors

Horizontal Oxidation Diffusion Behavior of MEMS-Based Tungsten-Rhenium Thin Film Thermocouples

Flexible miniaturized thin film thermocouples arrays for high temperature applications

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