Search results for " thermography"
showing 10 items of 65 documents
A novel TLC based technique for temperature field investigation in MD channel
2011
Implementation of active infrared NDT techniques using long square heating pulses
2012
The present work describes the implementation of active IR Thermography techniques for the NDT of thick polymer and glass-fibre reinforced polymer (GRP) composite panels. A low cost Thermal NDT set-up is proposed, comprising a single-detector IR camera with low thermal resolution and low frame rate, and common low-power halogen lamps as external heat source devices. The use of halogen lamps in particular requires several seconds of switch-on time in order to deliver meaningful and effective heat quantities. The influence of such long heat deposition intervals is investigated on the possibility to implement Transient Thermography and Lock-In Thermography techniques. Regarding the Transient T…
Contribution to the study and to the optimization of active thermographic process applied to surface crack detection
2017
The aim of this work is the detection of open and subjacent defects in metallic materials using laser-material interaction coupled with infrared thermography. This process is a possible alternative for magnetic particles testing and dye penetrant testing in the field of non-destructive testing. This work is divided into three main parties. At first, we have been interested in the characterization of optical and thermophysical properties of materials we used, in order to have good boundary conditions and also for the needs of temperatures fields measurements for validation. The second part concern the development of a numerical simulation model with two step approach: the first involves mode…
Determination of energy fluxes in composite plates or processed by Vico-constrained damping patch
2021
Lightening structures is an important issue in the world of transport. On the other hand, for the improvement of comfort, increasing performance is demanded today, particularly in the vibratory and acoustic field, which leads to the addition of damping materials. The proposed research work consists in the vibrational optimization of the structures by the addition of viscoelastic patches damping positioned wisely. The main function of the viscoelastic used to improve the vibro-acoustic performances, is to provide a mechanism of dissipation of mechanical energy. This attenuation of noise and vibrations causes a conversion of mechanical energy into thermal energy, which, after diffusion into t…
Defect detection in laser powder deposition components by laser thermography and laser ultrasonic inspections
2013
Laser Powder Deposition (LDP) techniques are being adopted within aerospace and automotive manufacturing to produce innovative precision components. Non-destructive techniques (NDT) for detecting and quantifying flaws within these components enables performance and acceptance criteria to be verified, improving product safety and reducing ongoing maintenance and product repair costs. In this work, software enabled techniques are presented for in-process analysis of NDT laser ultrasonic signals and pulsed laser thermography images of sequential metallic LPD layers. LPD tracks can be as thin as 200μm while deposited at a rate of 500 mm/min, requiring ultrafast inspection and processing times. …
Verifiche Diagnostiche nell'ex Chiesa Madre di Santa Margherita di Belice
2011
La relazione presenta in modo dettagliato gli esiti della seconda campagna di indagini diagnostiche, svolta nella fabbrica architettonica a cantiere di restauro in corso d'opera. L'obiettivo delle valutazioni non distruttive e minimamente invasive è valutare la corretta esecuzione degli interventi attraverso il confronto tra la diagnosi preliminare e quella post-intervento. The report presents in detail the results of the second campaign of diagnostic investigations, carried out in the architectural restoration site. The goal of minimally invasive and non-destructive evaluation is to assess the proper execution of consolidation through the comparison between the preliminary and post-interve…
Sistema integrato di metodiche diagnostiche per il restauro della chiesa di Sant’Anna La Misericordia a Palermo
2010
E' mostrata l'applicazione di un sistema combinato di letture strumentali finalizzate all'ottenimento di una diagnosi attraverso un approccio dall'elevato rigore scientifico. Le analisi strumentali sono svolte nella chiesa di Sant'Anna a Palermo. The graphs show the application of a combined system of instrumental readings aimed to obtain a diagnosis through a high scientific and rigorous approach. The instrumental tests are executed in the St. Anne church in Palermo.
Non destructive investigation of historical plaster and stonework in San Giovanni dei Napoletani Church in Palermo (Italy): evaluation of the exchang…
2008
Historic plasters will be increasingly at risk, due to natural alteration as well as renovation projects when internal and external plaster is refused and refaced. To sensibly conserve as much as possible of the historic substance, the preliminary inquiry is very important to get a profound knowledge of the integrity of materials and their decay, and to decide how to restore them. The application of NDI like infrared thermography (IRT) and radar investigation can be a reasonable support to evaluate the relationship between interior and exterior plaster, the microclimatic exchange in the architecture surfaces and the related alteration of materials. In fact they’re used for the detection of …
THE ROLE OF THERMOGRAPHY IN THE NON-DESTRUCTIVE EVALUATION OF HISTORICAL ARCHITECTURAL SURFACES. Some observation about the method and its purpose
2014
Infrared-Thermography (IRT) has become a supporting tool for the investigation of historical structures and facades. Using the non-destructive testing method for the detection can give a profound knowledge about the current status of the object and the state of decay, about different kinds of discontinuities at historical facades, of construction details and of thermal bridges in the facades. Different case studies of thermographic surveys on some Sicilian monuments are presented and discussed to illustrate how the method can offer applicable information about the investigated objects and demonstrate its reasonable integration into conservation projects.
Role of diagnostic surveys in the conservation of the former mother-church of Santa Margherita di Belice in Sicily: preliminary tests and restoration…
2013
The paper presents the results of a campaign of non-destructive and minimally invasive tests that were conducted in the former mother church of Santa Margherita di Belice (Agrigento, Sicily), damaged during the earthquake in 1968 and now re-used as a “Museum of Memory”. It includes a summary of the refl ections that arose during the preliminary surveys and instrumental tests, and reasons that supported the choice of investigations to be performed and methods to be specifi cally applied for the conservation of the architectural heritage. An innovative method designed to produce an effective diagnosis for the localization of defects and the choice of restoration techniques has been applied: i…