An investigation and review into microwave thermography for NDT and SHM

Yang, Ruiyue; Zhang, Hong; Li, Teng; He, Yunze

doi:10.1109/fendt.2015.7398326

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…The idea behind MWT is that where there is a damage such as delaminations, cracks and voids, the water trapped in the open defect is released for vapour tension and the associated heat is measured by the IR camera. In MWT, the dissipated power per unit volume P in dielectric media is provided by the following equation [ 19 , 142 ]:

where f is the frequency of the microwave excitation, E f is the electric field, ε 0 is the permittivity of the air and

is the loss factor that quantifies the power dissipation. The temperature change at heating time t by power dissipation of continuous microwave is [ 142 ]:

…”

Section: Eddy Current Stimulated Thermographymentioning

confidence: 99%

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Ciampa

Mahmoodi

Pinto

et al. 2018

Sensors

336

185

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Active infrared thermography is a fast and accurate non-destructive evaluation technique that is of particular relevance to the aerospace industry for the inspection of aircraft and helicopters’ primary and secondary structures, aero-engine parts, spacecraft components and its subsystems. This review provides an exhaustive summary of most recent active thermographic methods used for aerospace applications according to their physical principle and thermal excitation sources. Besides traditional optically stimulated thermography, which uses external optical radiation such as flashes, heaters and laser systems, novel hybrid thermographic techniques are also investigated. These include ultrasonic stimulated thermography, which uses ultrasonic waves and the local damage resonance effect to enhance the reliability and sensitivity to micro-cracks, eddy current stimulated thermography, which uses cost-effective eddy current excitation to generate induction heating, and microwave thermography, which uses electromagnetic radiation at the microwave frequency bands to provide rapid detection of cracks and delamination. All these techniques are here analysed and numerous examples are provided for different damage scenarios and aerospace components in order to identify the strength and limitations of each thermographic technique. Moreover, alternative strategies to current external thermal excitation sources, here named as material-based thermography methods, are examined in this paper. These novel thermographic techniques rely on thermoresistive internal heating and offer a fast, low power, accurate and reliable assessment of damage in aerospace composites.

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where f is the frequency of the microwave excitation, E f is the electric field, ε 0 is the permittivity of the air and

is the loss factor that quantifies the power dissipation. The temperature change at heating time t by power dissipation of continuous microwave is [ 142 ]:

…”

Section: Eddy Current Stimulated Thermographymentioning

confidence: 99%

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Ciampa

Mahmoodi

Pinto

et al. 2018

Sensors

336

185

View full text Add to dashboard Cite

show abstract

“…The latter is based on either exploiting some specific properties of samples under examination and accordingly assess the internal health integrity; this method is known as a Direct Material-Based Thermography (DMT), or adding some thermosresistive components to the composites at the manufacturing stage, which will work as an internal thermal stimulation when thermography tests are performed; this approach is known as an Indirect Material-Based Thermography (DMT) [70]. Yang et al [71] investigated the feasibility of MWT approach NDT applications and inspection of structural health integrity. It is worth mentioning that the application of MWT method in aerospace industry has only been introduced in the recent years.…”

Section: Applications Of Thermography For Aircraft Compositesmentioning

confidence: 99%

Diagnosis of Composite Materials in Aircraft Applications–Brief Survey of Recent Literature

Alhammad¹,

Fragonara²,

Avdelidis³

2020

Preprint

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Diagnosis and prognosis of failures for aircrafts’ integrity are some of the most important regular functionalities in complex and safety-critical aircraft structures. Further, development of failure diagnostic tools such as Non-Destructive Testing (NDT) techniques, in particular, for aircraft composite materials, has been seen as a subject of intensive research over the last decades. The need for diagnostic and prognostic tools for composite materials in aircraft applications rises and draws increasing attention. Yet, there is still an ongoing need for developing new failure diagnostic tools to respond to the rapid industrial development and complex machine design. Such tools will ease the early detection and isolation of developing defects and the prediction of damages propagation; thus allowing for early implementation of preventive maintenance and serve as a countermeasure to the potential of catastrophic failure. In this paper, following a short introductory summary and definitions, this paper provides a brief literature review of recent research on failure diagnosis of composite materials with an emphasis on the use of NDT techniques in aerospace industry. In addition to this, within a some of significant NDT application extents, prognosis of composites is also briefly discussed.

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“…MWT has also been used to inspect and characterize various kinds of materials and phenomena, such as debonding and delamination in composite materials [ 29 ]. So far, although there are several review works [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ], they have been limited to a specific field such as composite or renewable energy, so a review of MWT in the material detection field which includes the principles, advantages and disadvantages, developments and research trends is still needed. In this paper, a comprehensive review of MWT techniques for material evaluation has been provided, based on a detailed literature survey.…”

Section: Introductionmentioning

confidence: 99%

A Review of Microwave Thermography Nondestructive Testing and Evaluation

Zhang

Yang

et al. 2017

Sensors

Self Cite

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Microwave thermography (MWT) has many advantages including strong penetrability, selective heating, volumetric heating, significant energy savings, uniform heating, and good thermal efficiency. MWT has received growing interest due to its potential to overcome some of the limitations of microwave nondestructive testing (NDT) and thermal NDT. Moreover, during the last few decades MWT has attracted growing interest in materials assessment. In this paper, a comprehensive review of MWT techniques for materials evaluation is conducted based on a detailed literature survey. First, the basic principles of MWT are described. Different types of MWT, including microwave pulsed thermography, microwave step thermography, microwave pulsed phase thermography, and microwave lock-in thermography are defined and introduced. Then, MWT case studies are discussed. Next, comparisons with other thermography and NDT methods are conducted. Finally, the trends in MWT research are outlined, including new theoretical studies, simulations and modelling, signal processing algorithms, internal properties characterization, automatic separation and inspection systems. This work provides a summary of MWT, which can be utilized for material failures prevention and quality control.

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An investigation and review into microwave thermography for NDT and SHM

Cited by 9 publications

References 23 publications

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Diagnosis of Composite Materials in Aircraft Applications–Brief Survey of Recent Literature

A Review of Microwave Thermography Nondestructive Testing and Evaluation

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