Lymphedema is a chronic disorder of the lymphatic system characterized by the accumulation of interstitial fluid in soft tissues. Clinical signs such as swelling, fibro-adipose tissue accumulation, and skin thickening often manifest at advanced stages, making early detection essential to prevent irreversible tissue changes and functional impairment.
Various diagnostic methods are currently...
Active thermography is a non-destructive inspection technique widely used for various structures such as automobiles, aircrafts, and buildings. Although this is a convenient and non-contact inspection method, one practical limitation is that its inspection area is restricted by the heated area (or the size of the heat source); thus, its inspection efficiency cannot be sufficient when applying...
Active infrared thermography (IRT) is a well-established non-destructive testing technique for detecting subsurface defects in materials by analyzing thermal responses to external excitation. However, defect detectability is often limited by noise, spatial non-uniformities, and the complex nature of heat diffusion in heterogeneous materials. Recent research has demonstrated that combining...
The detection of subsurface defects in aluminum plates using infrared thermography addresses particularly stringent safety requirements in various industrial sectors, notably in civil aerospace construction and the automotive industry, where material reliability is a critical criterion. Such defects generally manifest as anomalies affecting both dimensional accuracy and geometric shape...
In fusion devices, infrared thermography is extensively used to monitor surface temperatures ranging from 100 to 3600°C. However, interpreting infrared measurements in reflective metallic environments, such as those found in fusion devices, presents significant challenges. These complexities often result in temperature measurement errors on critical components, posing operational risks. To...
This paper reports the advances of a study concerning an instrumental technique used to assess pain. Pain is a debilitating condition affecting about 20% of adults in the world. It can be considered as a warning mechanism or the response of human body to alert about a harmful state. It involves complex neuronal processes and it is considered as a personal experience with a relevant subjective...
Abstract:
The human body relies on precise neurovascular regulation and coordinated thermogenesis/thermoregulation mechanisms [1]. It maintains relatively stable core body temperature even during extreme external temperature fluctuations, thereby supporting homeostasis and critical physiological functions [2, 3]. This study utilized mid- (MWIR) and log-wave (LWIR) infrared thermography to...
Eddy Current Thermography (ECT) has emerged as a powerful technique in industrial environments for detecting surface breaking cracks, offering a highly automatable alternative to traditional inspection methods such as fluorescent magnetic particle testing or liquid penetrant inspection. Unlike these conventional techniques, ECT provides a high level of detectability and lends itself well to...
Environmental pollution poses significant risks to both ecosystem health and human well-being, particularly in sensitive or vulnerable areas where exposure to contaminants can impact local populations and biodiversity. Aquatic ecosystems, especially enclosed or volcanic lakes, are highly susceptible to anthropogenic pressures such as illegal wastewater discharges, which can lead to severe and...
Heat pipes have become key thermal management solutions for a wide range of applications where efficient and passive heat transfer is required. They are widely used in electronic cooling systems, such as computer processors and power electronics, as well as in aerospace and satellite systems, where reliability and compactness are critical. Among the different types, loop heat pipes (LHPs) are...
This study investigates the propagation velocity of thermal waves, which is fundamental knowledge for improving the efficiency of active thermography inspections. The velocity of the thermal waves has been studied and described in many publications; the velocity vp is obtained as the square root of 2αω (α and ω are thermal diffusivity and angular frequency, respectively). However, this...
Here we present a case study where it is used as a methodology for the evaluation of biomedical infrared imaging (BM-IRIm), as an aiding tool for the early diagnosis of diabetic neuropathy and diabetic foot syndrome (DFS). Considering that, DFS implies a group of anatomical and functional comorbidities expressed at the feet of diabetic people. Its principal characteristic parameters are: (1)...
This work presents a case study of finite element numerical simulation of heat transfer occurring in a thermal insulation sheet immersed in an air atmosphere and on which periodic optical radiation strikes one of its surfaces at a specific point generating an oscillating temperature field that follows optical absorption and subsequent light into heat conversion. In the first instance, the...
Laser-based additive manufacturing processes require precise monitoring of meltpool geometry to ensure process stability, dimensional accuracy, and metallurgical quality. Infrared thermography provides a non-contact, high-speed sensing solution capable of capturing thermal emission during laser–material interaction. However, extracting reliable geometric and energetic features from meltpool...
Frozen foods are a sustainable, cost-effective, and convenient source of food with a global industry worth over USD 300 billion. Freezing food extends self-life, but the growth of large ice crystals can damage the food, impacting texture and taste. The process of freezing consists of two distinct phases: ice nucleation, the formation of an ice nucleus initiating freezing, and ice growth, the...
Thermographic monitoring is increasingly used to supervise welding, yet robust in-process quality assessment remains challenging because thermal signatures are highly dynamic and depend on interacting physical factors such as heat input, surface condition, emissivity variation, reflections, shielding, and viewing geometry. This paper presents an anomaly-detection workflow for infrared...
Ice swimming is a very demanding sports discipline requiring extraordinary body adaptation to harsh environmental conditions. The International Ice Swimming Association (IISA) rules require water temperature to be below 5 °C during the entire swimming session. Athletes cover distances from 100 m to as much as 6 km in these conditions without wetsuits or any additional warming elements spending...
We propose to characterize materials with variable thermal properties by aiming a laser beam at a metal target in periodic motion. The intense heat flow from the laser is then dissipated by the movement of the target and can be observed and characterized by IR thermography (Figure 1). We will present the models and initial experiments in comparison with a stationary target. This type of study...
Polymethacrylimide (PMI) foam is widely used in aerospace applications due to its lightweight, high strength, and excellent thermal protection performance. However, its low dielectric constant and closed-cell microstructure make internal debonding defects difficult to detect using conventional nondestructive testing methods. To address the need for defect characterization in thermal protection...
Accurate interpretation of building façades from thermal images is usually being achieved through a two-stage process, where façade layout parsing and fine-grained masonry material segmentation are carried out in sequence. Automated structural assessment, material mapping, and digital-twin generation are being enabled when these stages are completed in a reliable way, although in practice the...
Coal fracture intensity strongly controls coal mass quality and geomechanical stability. However, its assessment in situ is often limited by safety constraints that prevent the use of external heat sources. This study investigates the use of infrared thermography (IRT) combined with controlled water cooling as a non-destructive method to evaluate fracture development in coal without external...
A thermochromic liquid crystal film is used as a detector of heat variations occurring on the surface of a solid material, allowing its thermal diffusivity to be obtained in an experimental setup like the well- established Lock-in Infrared Thermography with punctual excitation [1]. A novel configuration is described, where the thermochromic sensor is in direct contact with a thin sheet of the...
Aerial optical fiber cables in telecommunications access networks are highly susceptible to damage from environmental factors such as strong winds and tree contact. Conventional fault localization relies on optical time-domain reflectometry to identify approximate fault sections, followed by visible light injection to pinpoint exact breakpoints through visual observation of light leakage....
Non-destructive testing (NDT) techniques are essential for evaluating the integrity, reliability, and safety of engineering components without impairing their serviceability. NDT methods are widely employed in critical industrial sectors such as power generation, aerospace, manufacturing, and infrastructure, where early detection of defects can prevent catastrophic failure and reduce...
This study offers a thorough and accurate photothermal analysis of natural dye thin films employing Quantitative Infrared Thermography (QIRT), aiming to assess their thermophysical properties and ascertain their compatibility for incorporation into advanced, high-performance photonic devices. Natural dyes were obtained from their botanical origins, processed to exclude non-absorbing...
Abstract:
Carbon fiber reinforced polymer (CFRP) composites are widely used in aerospace, but manufacturing and in-service processes can introduce hidden defects that threaten structural safety. Infrared thermography [1] is suitable for large-area non-destructive testing, but it is affected by non-uniform heating and noise, making it difficult to reliably identify weak thermal anomalies. This...
Infrared thermography is becoming increasingly popular in animal production, favoring non-invasive techniques for monitoring animal health and welfare. In dairy cattle, hoof diseases and lameness represent a major health and welfare concern, leading to reduced productivity and increased treatment costs. The application of infrared thermography offers a promising approach for the early...
This work focuses on the spatial and temporal characterization of two halogen lamps, measured experimentally using appropriate instrumentation: an infrared photodiode at the end of a robotic arm, and electrical current and voltage sensors placed across the terminals of the halogen lamp generator. The evaluation of the electrical power consumed, and the spatial and temporal distribution of the...
Konstantin O. Petrosyants1, Igor A. Kharitonov1, Maksim V. Kozhukhov1, Aleksandr D. Pershin2
1 Moscow Institute of Electronics and Mathematics of
National Research University Higher School of Economics Moscow, Russia,
2 Limited Liability Company "InnoCenter VAO", Moscow, Russia
GaN solid state power amplifiers are important components for wireless power transfer in mobile...
Thyroid cancer is a prevalent form of endocrine cancer that requires early diagnosis to optimize patient outcomes. Importantly, standard diagnostic procedures, such as fine-needle aspiration biopsy, may be invasive. For this reason, it is crucial to explore new technologies to detect this pathology. In this context, infrared thermography (IRT) is a non-invasive imaging method that may evaluate...
Energy performance in buildings is a critical issue for researchers and engineers, who are increasingly focused on developing innovative materials and techniques to enhance thermal efficiency. Intelligent and sustainable design plays a pivotal role in reducing energy consumption, contributing to the decarbonization of human activities and mitigating climate change.
In parallel, the reuse of...
This paper introduces a cohesive experimental-computational framework for assessing natural dye thin films and dye-nanomaterial hybrid films as active layers in photothermal sensor applications. The study integrates Quantitative Infrared Thermography (QIRT) with sophisticated thermal response modeling to examine the enhancement of photothermal sensitivity and thermal kinetics in natural dye...
The surface condition of stainless steel strongly influences corrosion resistance, aesthetics, and the need for post-weld cleaning. In particular, oxide formation during thermal processing modifies surface emissivity and radiative heat exchange, which can bias temperature readings and, at the same time, provide an opportunity for non-contact diagnostics. This work investigates the feasibility...
Cyclic fatigue is an important effect responsible for the service life of gas turbine engine blades. One of the implementations of the destructive effect is the thermoelastic effect that occurs in the blade material when the engine operation changes. In this case, a superposition of the heating field from the gas-plasma flow from the outside of the blade and the forced cooling field from the...
In non-destructive testing (NDT), Flying-spot thermography has established itself as a reliable method for detecting surface-breaking cracks through local laser heating and infrared scanning. While effective, the automated analysis of these thermal sequences remains a significant challenge. The thermal signature of a crack—typically a high-frequency discontinuity in the thermal field—can be...
Legendre Transform is a mathematical algorithm that maps a function defined in the linear space in another function defined in the dual space. The function in the dual space is generated by the original curve’s tangent and supporting line. Given the function y=f(x) in the space (x,y), its Legendre Transform is g=x·m-f(x), m=f´(x), that using x=(f´)⁻¹(m) can be mapped in the dual space...
