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.

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 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.

Nonlinear Numerical Optimization Design Applied to Wall-Thickness of Welding T Shaped Connecting HDPE Tube

2010 ◽  
Vol 97-101 ◽  
pp. 2991-2994
Author(s):  
Yong Chang Guo ◽  
Jun Deng ◽  
Hao Bin Xie
Keyword(s):  
Wall Thickness ◽  
Material Properties ◽  
Numerical Optimization ◽  
Optimization Design ◽  
Constitutive Models ◽  
Test Results ◽  
Swarm Optimization ◽  
Stress Contour ◽  
Distribution Of Stress ◽  
Pipeline Design

There are two reasons to enlarge the thickness of welding HDPE tri-branch tube. Firstly, welding weakens the HDPE material properties. Secondly, stress concentration occurs at the joint of tri-branch tube. The material properties of HDPE and the tensile strength of welding HDPE were tested. Based on the test results, the wall-thickness of HDPE tri-branch tube was investigated by numerical optimization design with particle swarm optimization (PSO). Two material constitutive models of elasto-palstic and Ramberg-Osgood for HDPE are adopted in FEM. Some valuable conclusions of pipeline design are concluded by the distribution of stress contour curves and optimization curves of welding joint of HDPE tri-branch tube.

scholarly journals NDT ASSESSMENT OF EXISTING CONCRETE STRUCTURES: SPATIAL ANALYSIS OF REBOUND HAMMER RESULTS RECORDED IN-SITU

2015 ◽  
Vol 7 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Adorján Borosnyói
Keyword(s):  
Spatial Analysis ◽  
Surface Hardness ◽  
Hardness Measurement ◽  
Optical Recording ◽  
Destructive Testing ◽  
Rebound Hammer ◽  
Schmidt Rebound Hammer ◽  
The Impact ◽  
Non Destructive

A comparative spatial analysis of surface hardness of structural concrete is introduced. Main objective of the paper is to make a repeatability comparison of three types of the still most popular non-destructive testing devices for concrete: L-type original Schmidt rebound hammer, N-type original Schmidt rebound hammer and N-type Silver Schmidt rebound hammer. Results indicate that the surface hardness measurement uncertainty is related to the weight of the hammer mass and is apparently not related to the impact energy of the rebound hammer devices. It is observed that the measure of surface hardness for the Silver Schmidt rebound hammer (Q-value) does not have positive correlation to the original rebound index (R). Results indicate the best performance of the N-type original Schmidt rebound hammer in terms of stability and normality of data. Geostatistical analysis of the measured data (in terms of empirical semivariograms) highlights different statistical behaviour for the mechanical recording rebound hammers and for the electro-optical recording rebound hammer.

Application of the Ultrasound-Infrared Thermography Technique for Non-Destructive Evaluation of Defects in Shoe Bonding Parts

2010 ◽  
Vol 123-125 ◽  
pp. 823-826 ◽  
Author(s):  
Seung Hyun Choi ◽  
Lee Ku Kwac ◽  
Jae Yeol Kim
Keyword(s):  
Infrared Thermography ◽  
Evaluation Method ◽  
Local Heat ◽  
Inspection System ◽  
System Configuration ◽  
Thermal Camera ◽  
Ultrasound Waves ◽  
Wide Range ◽  
Defective Surface ◽  
Non Destructive

The infrared thermography technique is being applied in many areas. Particularly these days, non-destructive inspection and evaluation using the ultrasound-infrared thermography technique are hogging the spotlight in a wide range of study areas. The ultrasound-infrared thermography technique uses the principle that ultrasound waves projected to objects with cracks or defects at connections generate local heat from the defective surface. In this research, introduce nondestructive evaluation method for total inspection of special shoes applying Ultrasound Infrared thermography Technique. Performance of the proposed method are shown by through thermo-Image. The total inspection system using infrared thermal camera for special shoes, its applicability, and system configuration are introduced.

scholarly journals Discussion: An appreciation of the Schmidt rebound hammer

1958 ◽  
Vol 10 (30) ◽  
pp. 144-149
Author(s):  
J. Kolek ◽  
A. R. Cusens ◽  
T. N. W. Akroyd
Keyword(s):  
Rebound Hammer ◽  
Schmidt Rebound Hammer

scholarly journals Diagnostic Reliability of Architect Anti-HCV Tests and Diagnostic Cost of False Positivity; A Single Center Study in Turkey.

2021 ◽  
Author(s):  
Sinem Akkaya Isik ◽  
Ersin Tural ◽  
ERCAN YENİLMEZ ◽  
RIZA AYTAÇ ÇETİNKAYA ◽  
Orhan Baylan ◽  
...  
Keyword(s):  
Working Hours ◽  
Hcv Infection ◽  
Hcv Rna ◽  
Test Results ◽  
Potential Cost ◽  
Diagnostic Reliability ◽  
False Positivity ◽  
Test Kit ◽  
The Hours ◽  
Pcr Test

Background:Although the sensitivity of third generation anti-HCV CIA tests is high, false positivity rates, especially in populations with low HCV infection endemicity, are still high. Objectives:We aimed to determine the S/Co cut-off value of anti-HCV in the diagnosis of real positive patients based on the CIA test kit absorbance routinely used in our laboratory and to reveal the potential cost effectiveness of confirmatory tests for false positive samples. Methods:All anti-HCV CIA test results which were performed in the microbiology laboratory of our hospital between 2016-2019 were retrospectively screened and S/Co values of the patients were recorded. Among these, the results that were confirmed with HCV-RNA real-time PCR test were included. Patients who were previously diagnosed and treated were excluded. Results:A total of 257 patients, who were tested for HCV-RNA after reactive anti-HCV test results, were included in the study. Of the cases, 84(32.68%) had positive HCV-RNA. According to the ROC analysis, the optimal S/Co value was 8.58 with the sensitivity and specificity values 95.24% and 85.55%, respectively. According to this 8.58S/Co value, anti-HCV test was reactive in 105 cases and 80(76.2%) of these cases had active HCV infection. In order to prevent the false-negativity, the additional cost of using 1.0S/Co value to our institution was 4114.64USD, meaning that we spent 1028.66USD to diagnose per true-case of active HCV infection when using 1.0S/Co value. In our institution, approximately 6.25 working hours are spent to finalize the HCV-RNA PCR test. The hours spent for S/Co of 1.0 and 8.58 were 1606.25 and 658.25, respectively. Conclusions:False positive anti-HCV results are an economic burden on health economics of countries. At least, different S/Co values might be used in accordance with the purpose of the screening (like blood donors or pre-operative screening) and prevalence of HCV infection in different laboratories and different populations.

Sign in / Sign up

Export Citation Format

Share Document