Reconstruction of temperature distribution in a steel block using an ultrasonic sensor array

Gajdacsi, Attila; Jarvis, A. J. C.; Cegla, Frederic

doi:10.1063/1.4789175

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…defects. Temperature compensation or calibration can be carried out by using thermocouples [84], but this is not ideal for the cases where the external use of a sensor is prohibited. Temperature compensation techniques, such as baseline signal stretch (BSS) [85,86], optimal baseline selection (OBS) [87], hybrid combination of BSS and OBS [88,89], combination of OBS and adaptive filter algorithm [90], time-of-flight (ToF) calibration based on a linear relationship between the ToF and temperature [91], Hilbert transform and the orthogonal matching pursuit algorithm [92], and temperature compensation for both velocity and phase changes [93,94] have been proposed to reduce residuals between the baseline signal and the current signal.…”

Section: Temperature Compensation Techniquesmentioning

confidence: 99%

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Yule

Zaghari

Harris

et al. 2021

Meas. Sci. Technol.

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Turbine blades and nozzle guide vanes (NGVs) are operated at extreme temperatures in order to maximise thermal efficiency and power output of an engine. In this paper the suitability of existing temperature monitoring systems for turbine blades and nozzle guide vanes are reviewed. Both offline and online methods are presented and their advantages and disadvantages are examined. The use of offline systems is well established but their online equivalents are difficult to implement because of the limited access to components. There is the need for an improved sensor that is capable of measuring temperature in real time with minimum interference to the operating conditions of the engine, allowing operating temperatures to be increased to the limits of the components and maximising efficiency. Acoustic monitoring techniques are already used for a large number of structural health monitoring applications and have the potential to be adapted for use in temperature monitoring for turbine blades and NGVs. High temperatures severely affect the response of ultrasonic transducers. However, waveguides and buffer rods can be used to distance transducers from extreme conditions, while piezoelectric materials such as Yttrium Calcium Oxyborate single crystals and Aluminum Nitride have been developed for use at high temperatures. A new monitoring approach based on ultrasonic guided waves is introduced in this paper. The geometry of turbine blades and NGVs allows Lamb waves to propagate through their structure, and the presence of numerous cooling holes will produce acoustic reflections that can be utilised for monitoring temperature at a number of locations. The dispersive nature of Lamb waves makes their analysis difficult; however, wave velocity in dispersive regions is particularly sensitive to changes in temperature and could be utilised for monitoring purposes. The proposed method has the potential to provide high resolution and accuracy, fast response times, and the ability to place sensors outside of the gas path. Further research is required to develop a monitoring system based on the use of guided waves in extreme environments.

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Section: Temperature Compensation Techniquesmentioning

confidence: 99%

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Yule

Zaghari

Harris

et al. 2021

Meas. Sci. Technol.

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“…While some research has investigated reconstructing temperature fields in gas or liquid media based on ultrasonic measurements, 15,22 limited research has focused on the temperature reconstruction in solid media. 23,24 In addition, although many reconstruction algorithms have been proposed to obtain the two-dimensional (2D) or three-dimensional (3D) temperature field within a system, most of the tomography methods utilise the through-transmission ultrasonic technique that requires multiple transducers and access to multiple location along the boundary of the system.…”

Section: Previous Workmentioning

confidence: 99%

Ultrasonic monitoring of pipe wall interior surface temperature

Zhang

Cegla

Corcoran

2020

Structural Health Monitoring

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Accurate temperature measurement is a crucial aspect of structural health monitoring and prognosis. Conventional temperature measurement devices are either incapable of measuring subsurface temperatures in solids or need to be invasively installed. This study investigates the use of an ultrasonic technique for non-invasive measurement of subsurface temperatures in steel components; the temperature of a point on an inaccessible surface is inferred using a time-of-flight measurement from a transducer placed on an opposing accessible surface. Two different inversion approaches are presented, one named the assumed distribution method and the other named the inverse thermal modelling method. The robustness and accuracy of the two ultrasonic temperature inversion methods are quantitatively assessed via simulations and controlled experiments. It was found that both the assumed distribution and inverse thermal modelling methods demonstrate short thermal response times and are able to track the temperature evolution of inaccessible surfaces. A series of experimental studies show that in the presence of a 15°C difference between the accessible and inaccessible surfaces, the inaccessible surface temperature is typically measured to within better than 2°C with respect to a resistance temperature detector reference measurement. Additionally, the article compares the measurement performance achieved using a deployable electromagnetic acoustic transducer and a permanently installed piezo-electric PZT transducer. The time-of-flight measurements taken using the electromagnetic acoustic transducer system had higher random noise than the PZT system (standard deviations of 0.42 and 0.016 ns, respectively), subsequently leading to higher random noise in the temperature estimates.

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“…There are many research reports on ultrasonic computerized tomography systems for non-destructive inspection to find hidden defects or quality problems [3]. Computed tomography ultrasound was based on the estimated spatial distribution of the ultrasonic velocity to achieve detection [4,5]. Transit time parameter ultrasonic testing was based on the velocity distribution of concrete to detect internal cavity, cracks, and defects [6,7].…”

Section: Introductionmentioning

confidence: 99%

Improved image reconstruction based on ultrasonic transmitted wave computerized tomography on concrete

Fan

Zhu

2018

J Image Video Proc.

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Considering the non-uniqueness and instability of concrete defect detection in construction engineering, ultrasonic time of flight data and maximum likelihood expectation maximization algorithm were proposed to improve the readability of the ultrasonic reconstruction image. Ultrasonic transmitted waves reflect internal information when through concrete structures. Measurement signals were regularized and processed as transit time parameters. Maximum likelihood expectation maximization algorithm was optimized for image reconstruction of the concrete structure. The interpolation data as the density of measurement data was used to improve the readability of reconstruction images. The experimental measurement system, improved image reconstruction algorithm, and interpolation method were verified in detail by using simulation and concrete phantoms. The proposed image reconstruction technique based on maximum likelihood expectation maximization overcame the disadvantages of the traditional image reconstruction method, and it was effective to improve the accuracy and the quality of image reconstruction on concrete. Time of flight data and normalized interpolation were discussed in detail during image reconstruction. The results showed that it could make the position of an abnormal object more obvious, and it was more accurate for reflecting the internal structure of concrete.

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Reconstruction of temperature distribution in a steel block using an ultrasonic sensor array

Cited by 3 publications

References 10 publications

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Ultrasonic monitoring of pipe wall interior surface temperature

Improved image reconstruction based on ultrasonic transmitted wave computerized tomography on concrete

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