Ultrasonic Al2O3 Ceramic Thermometry in High-Temperature Oxidation Environment

Wei, Yanlong; Gao, Yubin; Xiao, Zhaoqian; Wang, Gao; Tian, Miao; Liang, Haijian

doi:10.3390/s16111905

Cited by 16 publications

(13 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The last study from a measuring in the harsh environment category is "Ultrasonic Al 2O3 Ceramic Thermometry in High-Temperature Oxidation Environment" from 2016 [31]. This study confirms ultrasonic thermometry as a feasible method for temperature measurements in oxidation environment with results in the range from 26 °C to 1600 °C.…”

Section: Papers Dealing With Measurement In Harsh Environmentssupporting

confidence: 57%

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ondraczka

2017

2017 International Conference on Applied Electronics (AE)

View full text Add to dashboard Cite

This paper presents an ultrasonic thermometry state of the art study and shows principle of the ultrasonic thermometry through experiments with an ultrasonic thermometer prototype. The study covers a brief ultrasonic temperature measurement research history and focuses on recent revelations in this field. The thermometer prototype is constructed to be portable and usable for educational presentations. Its principle, performance and ultrasonic temperature measurements results are described in the experimental part. Keywords-ultrasonic thermometry; air temperature measurement; time of flight; ultrasonic thermometer;I.

show abstract

Section: Papers Dealing With Measurement In Harsh Environmentssupporting

confidence: 57%

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ondraczka

2017

2017 International Conference on Applied Electronics (AE)

View full text Add to dashboard Cite

show abstract

“…III-Nitride materials as well as sapphire are well known for their robustness regarding harsh environments and their high electrical resistivity [17][18]. Moreover, sapphire and AlN are very stiff materials which show high acoustic velocity: the velocity of Rayleigh waves is around 5600 m/s for both c-oriented AlN and sapphire.…”

Section: Introductionmentioning

confidence: 99%

AlN/GaN/Sapphire heterostructure for high-temperature packageless acoustic wave devices

Bartoli

Aubert

Moutaouekkil

et al. 2018

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

Surface acoustic waves (SAW) technology is very promising to achieve wireless sensors able to operate in high temperature environments up to possibly 1000°C. However, there is currently a bottleneck related to the packaging of such sensors. The current high-temperature packaging solutions can withstand 600°C at most. This limitation could be overtaken by the development of packageless devices, based on the waveguiding layer acoustic waves (WLAW) principle. In such devices, the acoustic wave is confined inside an inner layer and is then isolated from undesired surface perturbations like dust deposition. In this paper, we investigate the performance of an AlN/IDT/GaN/Sapphire WLAW device used as a temperature sensor able to operate up to 500°C. After validating a room-temperature GaN material constant set with basic SAW measurements performed on IDT/GaN/Sapphire structure, the AlN/IDT/GaN/Sapphire device is simulated to determine the optimal relative thicknesses of AlN and GaN films in order to obtain a good wave confinement. Based on these calculations, an experimental WLAW device is performed and electrically characterized. The full wave confinement is experimentally confirmed by the lamination of an acoustic absorber on top of the device: no change in the scattering parameters was observed. The WLAW device is then electrically characterized between the ambient temperature and 500°C. A temperature coefficient of frequency (TCF) value of-34.6 ppm/°C is obtained, demonstrating the potential of the WLAW AlN/IDT/GaN/Sapphire structure as a packageless temperature sensor. Finally, the theoretical TCF of the AlN/IDT/GaN/Sapphire structure was numerically calculated by changing the material constants of AlN, GaN and Sapphire according to the temperature coefficients available in the literature. The theoretical and experimental data were found in good accordance.

show abstract

“…By increasing the temperature, the waveguide expands. This can be measured in the delayed ultrasonic signal and give conclusions about the temperature to be measured [158,159,160,161,162].…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

View full text Add to dashboard Cite

The need for non-destructive testing/structural health monitoring (SHM) is becoming increasingly important for gas turbine manufacturers. Incipient cracks have to be detected before catastrophic events occur. With respect to condition-based maintenance, the complex and expensive parts should be used as long as their performance or integrity is not compromised. In this study, the main failure modes of turbines are reported. In particular, we focus on the turbine blades, turbine vanes and the transition ducts of the combustion chambers. The existing monitoring techniques for these components, with their own particular advantages and disadvantages, are summarised in this review. In addition to the vibrational approach, tip timing technology is the most used technique for blade monitoring. Several sensor types are appropriate for the extreme conditions in a gas turbine, but besides tip timing, other technologies are also very promising for future NDT/SHM applications. For static parts, like turbine vanes and the transition ducts of the combustion chambers, different monitoring possibilities are identified and discussed.

show abstract

Ultrasonic Al2O3 Ceramic Thermometry in High-Temperature Oxidation Environment

Cited by 16 publications

References 22 publications

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

Ultrasonic thermometry study and portable ultrasonic thermometer prototype

AlN/GaN/Sapphire heterostructure for high-temperature packageless acoustic wave devices

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Contact Info

Product

Resources

About