Evaluation of different Jaipur foot–ankle assemblies using infrared thermography

2020 ◽  
pp. 030936462095851
Author(s):  
Natali Olaya Mira ◽  
Carolina Viloria Barragán ◽  
Jesus Alberto Plata
Keyword(s):  
Infrared Thermography ◽  
Technology Implementation ◽  
Infrared Camera ◽  
Region Of Interest ◽  
Epoxy Adhesive ◽  
Mechanical Behaviors ◽  
Joint Angles ◽  
Polyethylene Tube ◽  
Thermal Index ◽  
Maximum Temperatures

Background: Mechanical behavior is difficult to monitor in experimental environments, usually because of geometric or technology implementation limitations. Nevertheless, thermography has been shown to overcome these issues. Objectives: The aim of this study was to evaluate four types of assemblies between a Jaipur foot and a polyethylene tube using infrared thermography in order to find the best mechanical configuration in terms of thermal behavior. Study Design: Mechanical testing. Technique: An infrared camera captured short videos every 5 min over 10 h in six different positions (three in the back and three in front of the Jaipur foot) around a prosthesis subjected to repetitive stresses (axial force 980 N) simulating kinematic variables like joint angles. We established a region of interest around the foot–ankle assemblies and calculated maximum temperatures and thermographic indices. Results: In this study, the best foot–ankle assembly used epoxy adhesive because it presented the lowest temperature in the six positions and the lowest thermal index. Conclusions: Thermographic techniques can be used to study mechanical behaviors in complex experimental situations.

Characterization of Fouled Flat Sheet Membranes by Infrared Thermography

2014 ◽  
Author(s):  
Kennethrex O. Ndukaife ◽  
George Agbai Nnanna
Keyword(s):  
Surface Temperature ◽  
Infrared Thermography ◽  
Spectral Power ◽  
Membrane Surface ◽  
Infrared Camera ◽  
Feed Solution ◽  
Feed Concentration ◽  
Ir Camera ◽  
Measure Surface Temperature

An Infrared thermography (IRT) technique for characterization of fouling on membrane surface has been developed. The emitted spectral power from the fouled membrane is a function of emissivity and surface morphology. In this work, a FLIR A320 IR camera was used to measure surface temperature and emissivity. The surface temperature and the corresponding emissivity value of various areas on the fouled membrane surface is measured by the infrared camera and recorded alongside its thermogram. Different fouling experiments were performed using different concentrations of aluminum oxide nanoparticle mixed with deionized water as feed solution (333 ppm, 1833 ppm and 3333 ppm) so as to investigate the effect of feed concentration on the degree of fouling and thus its effect on the emissivity values measured on the membrane surfaces. Surface plots in 3D and Line plots are obtained for the measured emissivity values and thickness of the fouling deposit on the membrane surface respectively. The results indicate that the IRT technique is sensitive to changes that occur on the membrane surface due to deposition of contaminants on the membrane surface and that emissivity is a function of temperature, surface roughness and thickness of the specimen under investigation.

Reflection interference removal for infrared thermography images based on GAN

2021 ◽  
Vol 63 (9) ◽  
pp. 529-533
Author(s):  
Jiali Zhang ◽  
Yupeng Tian ◽  
LiPing Ren ◽  
Jiaheng Cheng ◽  
JinChen Shi
Keyword(s):  
Neural Networks ◽  
Infrared Thermography ◽  
Metal Surfaces ◽  
Infrared Image ◽  
Infrared Camera ◽  
Infrared Images ◽  
Generative Adversarial Network ◽  
Adversarial Network ◽  
Continuous Application ◽  
Visible Images

Reflection in images is common and the removal of complex noise such as image reflection is still being explored. The problem is difficult and ill-posed, not only because there is no mixing function but also because there are no constraints in the output space (the processed image). When it comes to detecting defects on metal surfaces using infrared thermography, reflection from smooth metal surfaces can easily affect the final detection results. Therefore, it is essential to remove the reflection interference in infrared images. With the continuous application and expansion of neural networks in the field of image processing, researchers have tried to apply neural networks to remove image reflection. However, they have mainly focused on reflection interference removal in visible images and it is believed that no researchers have applied neural networks to remove reflection interference in infrared images. In this paper, the authors introduce the concept of a conditional generative adversarial network (cGAN) and propose an end-to-end trained network based on this with two types of loss: perceptual loss and adversarial loss. A self-built infrared reflection image dataset from an infrared camera is used. The experimental results demonstrate the effectiveness of this GAN for removing infrared image reflection.

Evaluation of Martensite Fraction in 1026 Steel by Infrared Thermography Combined with the Koistinen-Marburger Model

2016 ◽  
Vol 869 ◽  
pp. 411-415
Author(s):  
Dimitry V. Bubnoff ◽  
Mariana M.O. Carvalho ◽  
Carlos Roberto Xavier ◽  
Gláucio S. da Fonseca ◽  
José Adilson de Castro
Keyword(s):  
Heat Treatment ◽  
Phase Transformations ◽  
Infrared Thermography ◽  
Martensite Transformation ◽  
Infrared Camera ◽  
Martensite Formation ◽  
Transformation Kinetics ◽  
Temperature Distributions ◽  
Martensite Fraction ◽  
Model Adjustment

In the present work, the martensite formation during heat treatment of 1026 steel was studied in order to acquire process knowledge and reinforce the effectiveness of infrared thermography method to evaluate the temperature distributions. Several tests were carried out and monitored by an infrared camera and thermocouples. Martensite fraction was evaluated with the aid of the Koistinen-Marburger model and adequate parameters describing phase transformations were obtained for 1026 steel samples. This research revealed the need of model adjustment in order to accurately describe the martensite transformation kinetics according to experimental results.

scholarly journals Thermographic Screening of Beef Cattle Metatarsal Growth Plate Lesions

Animals ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 191
Author(s):  
Giorgia Fabbri ◽  
Matteo Gianesella ◽  
Rossella Tessari ◽  
Andrea Bassini ◽  
Massimo Morgante ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Growth Plate ◽  
Imaging Techniques ◽  
Infrared Camera ◽  
Correct Treatment ◽  
Non Invasive ◽  
Hind Limbs ◽  
Practical Tool ◽  
Beef Bulls ◽  
Maximum Temperatures

Lameness represents one of the main causes of decreased productive performance and impaired animal welfare in the bovine industry. Young beef bulls are predisposed to develop diseases of the growing skeleton, especially growth plate lesions. Early diagnosis is indispensable for ensuring correct treatment, fast recovery and reduction losses. However, when dealing with beef cattle, this is not always possible. Fast and reliable diagnostic imaging techniques are necessary to improve dealing with lameness in beef animals. The aim of the present study was to examine the potential of thermographic imaging as a non-invasive tool for rapidly screening beef bulls for the presence of growth plate lesions. Here, 20 Charolais and Limousine beef bulls affected by growth plate lesions in one of the rear limbs were selected. IRT was performed on both hind limbs using a digital infrared camera (ThermaCam T420 Model, Flir Systems, Boston, MA, USA), prior to radiographic imaging and clinical examination. The temperature of healthy and affected limbs was measured in two regions: the area correspondent to the growth plate (AR01) and the whole area of the metatarsus (AR02). Growth plate lesions were found to increase the maximum, mean, and minimum temperatures in AR01; and the mean and maximum temperatures in AR02, therefore, indicating the potential of IRT as a reliable, practical tool for screening growth plate lesions in beef bulls.

scholarly journals Infrared Thermography for DIEP Flap Breast Reconstruction Part II: Analysis of the Results

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 49 ◽  
Author(s):  
Gunther Steenackers ◽  
Ben Cloostermans ◽  
Filip Thiessen ◽  
Yarince Dirkx ◽  
Jan Verstockt ◽  
...  
Keyword(s):  
Breast Reconstruction ◽  
Infrared Thermography ◽  
Hot Spots ◽  
Breast Surgery ◽  
Infrared Camera ◽  
Diep Flap ◽  
Flap Surgery ◽  
Qualitative Information ◽  
Thermal Measurements ◽  
The Individual

Dynamic infrared thermography (DIRT) has been used to locate perforating vessels and to assist in reconstructive breast surgery. Qualitative information on the perforating vessels is obtained by analysing the rate and pattern of rewarming of hot spots which are easily registered with an infrared camera. Thermal measurements are made before and during surgery and are compared with the CT-images available before operation. The thermal images can provide the individual influence of each perforator on the flap, as well as the dimensions of the perfused area. We will investigate if the influence of the different dominant perforators can be assessed by dynamic infrared thermography as a useful tool for recostructive DIEP-flap surgery.

scholarly journals The Feasibility of Identifying Defects Illustrated on Building Facades by Applying Thermal Infrared Images with Shadow

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 3
Author(s):  
Tsai ◽  
Huang ◽  
Tai
Keyword(s):  
Surface Temperature ◽  
Infrared Thermography ◽  
Infrared Camera ◽  
Thermal Infrared ◽  
Infrared Images ◽  
Building Facades ◽  
Thermal Infrared Images ◽  
Non Destructive

Infrared thermography (IRT) has been widely employed to identify the defects illustrated in building facades. However, the IRT covered with a shadow is hard to be applied to determine the defects shown in the IRT. The study proposed an approach based on the multiplicated model to describe quantitively the shadow effects, and the IRT can be segmented into few classes according to the surface temperature information recorded on the IRT by employing a thermal infrared camera. The segmented results were compared with the non-destructive method (acoustic tracing) to verify the correctness and robustness of the approach. From the processed results, the proposed approach did correctly identify the defects illustrated in building facades through the IRTs were covered with shadow.

Thermal Response for a Reinforced Concrete Slab Analyzed with Active Infrared Thermography and Comsol Multiphysics

2015 ◽  
Vol 760 ◽  
pp. 627-632
Author(s):  
Razvan Gabriel Dragan ◽  
Ileana Constanta Rosca ◽  
Diana Cazangiu ◽  
Alexandru Stefan Leonte
Keyword(s):  
Reinforced Concrete ◽  
Infrared Thermography ◽  
Concrete Slab ◽  
Infrared Camera ◽  
Heat Transfer Process ◽  
Electrical Heating ◽  
Comsol Multiphysics ◽  
Reinforced Concrete Slab ◽  
Thermal Distribution ◽  
Active Infrared Thermography

This paper presents a non-destructive technique (NDT) using active infrared thermography and FEM analyses with Comsol Multiphysics software applied for thermal distribution detection through reinforced concrete. For this work a reinforced concrete slab was created having a parallelepiped shape, the length and the width of 400 mm and the thickness of 50 mm. The concrete slab was reinforced using a rebar mesh of 18 mm diameter. The experimental installation consisted of an electrical heating source and a steel frame for fixing the slab and for the thermal distribution analyses an infrared camera was used. The same type of material and conditions like in the laboratory was used for the FEM analyses in Comsol Multiphysiscs to compare with the experimental part. A concrete slab without steel was used to determine the difference between the simple concrete and reinforced concrete in the heat transfer process.

scholarly journals ESTUDO DE PARÂMETROS RELEVANTES NA OBTENÇÃO DE TERMOGRAMAS PARA DIAGNÓSTICO DE PROBLEMAS PATOLÓGICOS

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Camila Akemi Sakamoto ◽  
Cesar Fabiano Fioriti
Keyword(s):  
Temperature Gradient ◽  
Infrared Thermography ◽  
Infrared Camera ◽  
Sensitivity Study ◽  
External Factors ◽  
Atmospheric Attenuation ◽  
Influence Of Temperature ◽  
Laboratory Environment ◽  
The Subject

RESUMO: Esse trabalho trata do estudo de sensibilidade de um equipamento de termografia, em que foram avaliados os seguintes parâmetros relevantes na obtenção de termogramas: (1) influência das reflexões (superfície refletante e obstáculos), (2) influência do gradiente de temperatura, (3) influência da cor (temperatura ambiente e radiação solar) e (4) influência da distância da câmera infravermelha ao objeto. Dessa maneira, de caráter experimental, foi realizada em ambiente de laboratório uma análise e interpretação da avaliação dos parâmetros relevantes na obtenção de termogramas, sendo que foi possível avaliar as potencialidades da termografia infravermelha conseguindo com os diferentes ensaios a determinação da temperatura superficial dos materiais e componentes, bem como pode ser verificado a importância do conhecimento da sensibilidade das técnicas de ensaio utilizadas em medições para a avaliação do desempenho físico de corpos de prova. Por meio dos parâmetros estudados foi possível concluir que há muitas influências, como por exemplo, a refletividade e a atenuação atmosférica, que podem produzir uma análise incorreta ou até mesmo incapacitar a visualização de algum problema patológico presente. É preciso então, além de conhecimento do assunto, ter atenção a todos os fatores externos de forma a serem detectados e eliminados, ou ainda levados em consideração na hora da execução da técnica da termografia infravermelha para que sejam minimizados.
 
 ABSTRACT: This paper presents a sensitivity study of a thermography equipment, in which evaluated the following parameters relevant to the achievement of thermographs: (1) influence of reflections (refletante surface and obstacles), (2) influence of temperature gradient, (3) influence of color (ambient temperature and solar radiation) and (4) influence of distance from infrared camera to the object. In this way, a laboratory analysis and interpretation of the evaluation of the relevant parameters in the obtaining of thermograms was carried out in a laboratory environment, and it was possible to evaluate the potentialities of the infrared thermography, obtaining with the different tests the determination of the surface temperature of the materials and Components as well as the importance of knowledge of the sensitivity of the test techniques used in measurements for the evaluation of the physical performance of test specimens can be verified. Through the studied parameters it was possible to conclude that there are many influences, such as reflectivity and atmospheric attenuation, which can produce an incorrect analysis or even incapacitate the visualization of some present pathological problem. It is necessary, in addition to knowledge of the subject, to pay attention to all external factors in order to be detected and eliminated, or even taken into account when performing the technique of infrared thermography so that they are minimized.

Experiments of Infrared Thermography NDT in Composite Materials with Honeycomb Sandwich Structure

2011 ◽  
Vol 311-313 ◽  
pp. 127-130 ◽  
Author(s):  
Cui Qin Wu ◽  
Wei Ping Wang ◽  
Qi Gang Yuan ◽  
Yan Jun Li ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Surface Temperature ◽  
Infrared Thermography ◽  
Sandwich Structure ◽  
Fiber Composite ◽  
Infrared Camera ◽  
Carbon Fiber Composite ◽  
Heating Source ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Structure

To estimate the disbond defects of the carbon fiber composite materials with honeycomb sandwich structure applied in the aerospace, active infrared thermographic NDT (non-destructive testing) is researched. The specimen with known disbond defects is detected by an active infrared thermography system. The specimen is stimulated by a pulse heating source. Based on the thermal wave propagation theory, the surface temperature of the specimen contained defects will differ from the surrounding sound area because of their different thermal-physical properties. The surface temperature is monitored using infrared camera and analyzed by a computer in the time domain. The experiment results show that the active infrared thermographic NDT is rapid, effective and intuitive for detecting the disbond defects in composite materials with honeycomb sandwich structure.

scholarly journals Uncertainty Analysis of Infrared Thermography in Convective Heat Transfer

Volume 1 ◽  
2004 ◽  
Author(s):  
Nelson K. Akafuah ◽  
Carsie A. Hall ◽  
Ting Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Measurement ◽  
Convective Heat Transfer ◽  
Infrared Thermography ◽  
Convective Heat ◽  
Infrared Camera ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Test Plate ◽  
Non Destructive

Infrared thermography is the preferred choice in many industrial processes for thermal diagnostics, condition monitoring, and non-destructive testing. However, the inherent uncertainty of surface emissivity affects the accuracy of temperature measurement by infrared thermography. In this paper a comprehensive experimental investigation was conducted to assess the uncertainty of infrared thermography in convective heat transfer. Four convective heat transfer conditions, including natural and forced convection on a flat plate, were studied. A composite test plate was constructed with an embedded heater and thermocouples. The thermocouples were used as references to compare with measurements by the infrared camera. The results indicate that the uncertainty of temperature measurement is about 4°F (2.7% of the wall-to-ambient temperature difference) with the largest uncertainty being contributed by calibration of the infrared camera. The uncertainty of the heat transfer coefficient is 4.2% which is largely contributed by wall temperature measurement.

Sign in / Sign up

Export Citation Format

Share Document