scholarly journals Preliminary Research of Possibility of Using Thermovision for Diagnosis and Predictive Maintenance of Marine Engines

2019 ◽  
Vol 49 (3) ◽  
pp. 49-64
Author(s):  
Justyna Molenda ◽  
Adam Charchalis
Keyword(s):  
Infrared Thermography ◽  
Infrared Camera ◽  
Software Test ◽  
Test Results ◽  
Thermal Camera ◽  
Monitoring Tool ◽  
Marine Engines ◽  
Effective Condition ◽  
Preliminary Research ◽  
Marine Engineering

Abstract Infrared thermography has evolved as an effective condition monitoring tool for real-time temperature monitoring of objects or processes in a noncontact way. This paper presents the results of research conducted with use of infrared camera for monitoring 3AL25/30 engine, especially turbocharger, placed in Marine Engineering Faculty of Gdynia Maritime University. Research was carried out using a thermal camera NEC Thermo Gear G100 with appropriate software. Test results improved that infrared thermography is useful also for monitoring the condition of ship engine equipment, and enable anticipating failures during engine work.

scholarly journals Automatic depth scanning system for 3D infrared thermography

2016 ◽  
Vol 2 (1) ◽  
pp. 369-372 ◽  
Author(s):  
Michael Unger ◽  
Adrian Franke ◽  
Claire Chalopin
Keyword(s):  
Infrared Thermography ◽  
Imaging Technique ◽  
Infrared Camera ◽  
High Sensitivity ◽  
Ground Truth ◽  
Scanning System ◽  
Depth Camera ◽  
Measured Temperature ◽  
Thermal Camera ◽  
Thermal Cameras

AbstractInfrared thermography can be used as a pre-, intra- and post-operative imaging technique during medical treatment of patients. Modern infrared thermal cameras are capable of acquiring images with a high sensitivity of 10 mK and beyond. They provide a planar image of an examined 3D object in which this high sensitivity is only reached within a plane perpendicular to the camera axis and defined by the focus of the lens. Out of focus planes are blurred and temperature values are inaccurate. A new 3D infrared thermography system is built by combining a thermal camera with a depth camera. Multiple images at varying focal planes are acquired with the infrared camera using a motorized system. The sharp regions of individual images are projected onto the 3D object’s surface obtained by the depth camera. The system evaluation showed that deviation between measured temperature values and a ground truth is reduced with our system.

scholarly journals An Infrared Thermography Approach to Evaluate the Strength of a Rock Cliff

2021 ◽  
Vol 13 (7) ◽  
pp. 1265
Author(s):  
Marco Loche ◽  
Gianvito Scaringi ◽  
Jan Blahůt ◽  
Maria Teresa Melis ◽  
Antonio Funedda ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Constitutive Models ◽  
Test Results ◽  
Thermal Camera ◽  
Rebound Hammer ◽  
Schmidt Rebound Hammer ◽  
Coastal Cliff ◽  
The Hours ◽  
Mechanical Information ◽  
Alpine Environments

The mechanical strength is a fundamental characteristic of rock masses that can be empirically related to a number of properties and to the likelihood of instability phenomena. Direct field acquisition of mechanical information on tall cliffs, however, is challenging, particularly in coastal and alpine environments. Here, we propose a method to evaluate the compressive strength of rock blocks by monitoring their thermal behaviour over a 24‐h period by infrared thermography. Using a drone‐mounted thermal camera and a Schmidt (rebound) hammer, we surveyed granitoid and aphanitic blocks in a coastal cliff in south‐east Sardinia, Italy. We observed a strong correlation between a simple cooling index, evaluated in the hours succeeding the temperature peak, and strength values estimated from rebound hammer test results. We also noticed different heatingcooling patterns in relation to the nature and structure of the rock blocks and to the size of thefractures. Although further validation is warranted in different morpho‐lithological settings, we believe the proposed method may prove a valid tool for the characterisation of non‐directly accessible rock faces, and may serve as a basis for the formulation, calibration, and validation of thermo‐hydro‐mechanical constitutive models.

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 Application of Infrared Thermography in an Adequate Reusability Analysis of Photovoltaic Modules Affected by Hail

2022 ◽  
Vol 12 (2) ◽  
pp. 745
Author(s):  
Hrvoje Glavaš ◽  
Matej Žnidarec ◽  
Damir Šljivac ◽  
Nikola Veić
Keyword(s):  
Infrared Thermography ◽  
Power Plants ◽  
Test Site ◽  
Test Results ◽  
Pv System ◽  
Photovoltaic Modules ◽  
Complementary Method ◽  
Validity Criterion ◽  
Thermographic Analysis ◽  
Thermal Patterns

Infrared thermography, in the analysis of photovoltaic (PV) power plants, is a mature technical discipline. In the event of a hailstorm that leaves the PV system without the support of the power grid (and a significant portion of the generation potential), thermography is the easiest way to determine the condition of the modules and revive the existing system with the available resources. This paper presents research conducted on a 30 kW part of a 420 kW PV power plant, and demonstrates the procedure for inspecting visually correct modules that have suffered from a major natural disaster. The severity of the disaster is shown by the fact that only 14% of the PV modules at the test site remained intact. Following the recommendations of the standard IEC TS 62446-3, a thermographic analysis was performed. The thermographic analysis was preceded by an analysis of the I-V curve, which was presented in detail using two characteristic modules as examples. I-V curve measurements are necessary to relate the measured values of the radiation and the measured contact temperature of the module to the thermal patterns. The analysis concluded that soiled modules must be cleaned, regardless of the degree of soiling. The test results clearly indicated defective module elements that would result in a safety violation if reused. The research shows that the validity criterion defined on the basis of the analysis of the reference module can be supplemented, but can also be replaced by a statistical analysis of several modules. The comparison between the thermographic analysis and the visual inspection clearly confirmed thermography as a complementary method for testing PV-s.

scholarly journals The use of infrared thermography for welfare assessment during the application of ear tags to lambs

2017 ◽  
Vol 60 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Murat Karakuş ◽  
Ferda Karakuş
Keyword(s):  
Early Detection ◽  
Infrared Thermography ◽  
Behavioral Responses ◽  
Infrared Images ◽  
Thermal Camera ◽  
Inflammatory Reactions ◽  
Welfare Assessment ◽  
The Mean ◽  
The Right

Abstract. The aim of this study was to determine the effect of metal-tipped, plastic-tipped, and electronic ear tags on the likelihood of infection using infrared thermography and to evaluate the effect on welfare by examining the behavioral responses of the lambs. Ninety lambs with an average age of 6 months were used in this study. Before the application of the ear tags, infrared images of the right and left ears of the lambs were taken with the thermal camera and the infrared temperatures were recorded. Measurements were repeated on days 1, 4, 10, and 30 after the ear tag application. The mean of infrared ear temperatures on days 0, 1, 4, 10, and 30 were found to be 14.60, 23.20, 23.77, 20.36, and 17.61 °C for the metal-tipped ear tag group; 15.69, 21.50, 20.42, 18.00, and 16.39 °C for the plastic-tipped ear tag group; and 15.17, 29.47, 27.49, 25.93, and 20.61 °C for the electronic ear tag group. The infrared temperatures on days 1, 4, and 10 in the control and experimental groups were significantly different from each other (P < 0.001). The plastic-tipped ear tags caused fewer problems and are preferred to the traditional ear tags with metal tips. The electronic ear tags caused more inflammatory reactions compared to metal- or plastic-tipped ear tags. The infrared thermography method may be used as a useful tool in the early detection of the inflammatory reactions and infections caused by the application of ear tags.

Investigation of Bending Fatigue of Composite Plates by Using Infrared Thermography

2011 ◽  
Vol 268-270 ◽  
pp. 406-411 ◽  
Author(s):  
Ömer Sinan Şahin ◽  
Murat Selek ◽  
Şirzat Kahramanlı
Keyword(s):  
Infrared Thermography ◽  
Heat Generation ◽  
Temperature Rise ◽  
Epoxy Composite ◽  
Composite Plates ◽  
Fatigue Loading ◽  
Thermal Camera ◽  
Thermal Images ◽  
Bending Fatigue ◽  
Damage Initiation

In this study, the temperature rise of composite plates with a hole during fatigue loading was investigated. Woven glass/epoxy composite plates with eight plies were subjected to bending fatigue loading and materials were observed by using a thermal camera during the test. Previous works showed that a heat generation can form due to internal friction and damage formation. Therefore, a thermographic infrared imaging system was used to detect the temperature rise of composite specimens. During the tests, the thermal images of the specimens have been recorded by a thermal camera and then transferred to the image processing program which has been developed by using MATLAB. By using these thermal images, the spot temperatures of the specimen were obtained by using artificial neural networks. The obtained temperatures show local increase at places where the heat generation localized. These regions considered being the probable damage initiation sites. It is shown in this study that most probable damage initiation zones in the woven glass/epoxy composite material can be detected by using infrared thermography (IRT) approach prior to failure.

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.

Interaction of Ice Floes With Columns of a Semi-Submersible Platform

1983 ◽  
Vol 105 (4) ◽  
pp. 460-463
Author(s):  
P. G. Noble ◽  
D. Singh
Keyword(s):  
Maximum Load ◽  
Test Results ◽  
Ice Load ◽  
Physical Model Tests ◽  
Ice Concentration ◽  
Drilling Unit ◽  
Ice Loads ◽  
Ice Field ◽  
Preliminary Research ◽  
Ice Floes

A preliminary research project has been carried out to determine the effect of small ice floes on a semi-submersible drilling unit. Physical model tests have been conducted with two main objectives: first, to determine the ability of the columns to prevent ice from passing between them (arching) and thus minimizing the chance of riser damage, and second, to determine the total ice load on the semi-submersible during interaction with ice field concentrations. Three models were used, representing one half of a four, six or eight-legged semi-submersible platform. The dimensions and spacing of the columns were such that the heave and pitch responses were kept constant. The tests were conducted at a model scale of 1:30 using synthetic ice. Test results showed the maximum load measured on a four-legged semi-submersible model, at 100 percent ice floe concentration, was on the order of half of that measured on six or eight-legged semi-submersible models. Also the ice loads on a four-legged semi-submersible model at lower ice floe concentration were substantially less than those for six or eight-legged semi-submersible models. The total ice load on semi-submersible models is found to be a function of ice floe concentration. Up to about 75 percent ice concentration, ice loads varied linearly. Beyond that, the loads increased exponentially for all semi-submersible models.

Sign in / Sign up

Export Citation Format

Share Document