Advances in Non-Stationary Frequency Modulated Thermal Wave Imaging for Non-Destructive Testing and Evaluation
نویسندگان
چکیده
Among the widely used Non-Destructive Testing and evaluation approaches, InfraRed Thermography has proven to be one of the vital NDT technique due to its inherent capabilities for testing and evaluation of various solid materials. Nevertheless, there are some limitations; depending upon the test approach used, as well as the adopted data processing method. In active approach of infrared thermography, most widely used excitation sources are optical excitation due to its wide area remote heating capabilities with the intention of heat flow into the test specimen. The temperature differences during transient heating over the material is used for subsurface defects detection. Since the heating features of the stimulus sources are well known (duration and it’s amplitude level), they can be considered for quantitative information. However, when a material is heated, the thermal waves penetrate into the material. The waves generally of various amplitudes for chosen band of frequencies or a mono frequency sinusoidal thermal excitation are launched into the specimen during the active heating. This work presents a transient non-stationary thermographic testing technique (which can utilize desired band of frequencies in limited span of time), concerning the assessment of metallic material with artificial defects introduced.
منابع مشابه
Quadratic Frequency Modulated Thermal Wave Imaging for Non-destructive Testing
Thermal non-destructive testing and evaluation of glass fibre reinforced plastic materials has gained more importance in aerospace industry due to low weight and high strength capabilities in severe environmental conditions. More recently, pulse compression favorable non-stationary excitation schemes have been exhibiting reliable defect detection capabilities in infrared non-destructive testing...
متن کاملPulse Compression with Gaussian Weighted Chirp Modulated Excitation for Infrared Thermal Wave Imaging
This paper proposes a novel signal processing approach to thermal non-destructive testing by incorporating Gaussian window function onto the linear frequency modulated incident heat flux to achieve better pulse compression properties. The present work highlights a finite element analysis based modeling and simulation technique in order to test the capabilities of the proposed windowing scheme o...
متن کاملMeasurement and Modelling of the Rubber Resilience based on Ultrasonic Non-destructive Testing in Tires
In tire industry, it is very crucial to evaluate physical and mechanical properties of the rubber which is used for production of the tire, to ensure the quality of the final product. Resilience is an important property of a rubber, which cannot be evaluated through direct measurement in production cycle in this industry. Therefore, non-destructive ultrasonic testing, which has been used in man...
متن کاملApplications of phase sensitive thermography for nondestructive evaluation
The technique of thermal wave thermography combines advantages of both conventional thermal wave measurement and thermography using a commercial IR camera. This technique allows for shorter imaging time and depth profiling. Non-uniformity of heating area and optical surface structures can be suppressed in phase images. Several examples show the potential applications of thermal wave thermograph...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2016