Thermographic methods applied to industrial materials

1986 ◽  
Vol 64 (9) ◽  
pp. 1150-1154 ◽  
Author(s):  
W. N. Reynolds
Keyword(s):  
Steady State ◽  
Thermal Imaging ◽  
Video Recording ◽  
Imaging Systems ◽  
Infrared Thermal Imaging ◽  
Testing Conditions ◽  
Nondestructive Examination ◽  
Industrial Inspection ◽  
Industrial Materials ◽  
Transient Thermal

Steady-state, or quasi-steady-state thermography is a well-known industrial inspection technique that has not so far been widely used in the nondestructive examination of materials. However, recent advances in infrared thermal-imaging systems have greatly broadened the range of possible uses through video-recording techniques that enable transient thermal distributions to be captured and analyzed very rapidly. In this paper, applications are described to a range on industrial materials, with illustrations of defects in bonded, coated, laminated, and cast structures. Current work is devoted to detailed comparisons with radiographic, ultrasonic, and other techniques as regards speed, effectiveness, and adaptability to manufacturing and testing conditions.

Research on Carboform Nondestructive Examination Based on Infrared Thermal Wave

2011 ◽  
Vol 271-273 ◽  
pp. 177-180
Author(s):  
Hai Feng Chang
Keyword(s):  
Edge Detection ◽  
Contrast Enhancement ◽  
Thermal Performance ◽  
Thermal Wave ◽  
Thermal Imaging ◽  
Median Filter ◽  
Performance Difference ◽  
Infrared Thermal Imaging ◽  
Nondestructive Examination ◽  
Infrared Thermal Images

Due to special characteristics of Carboform material, there are many difficulties to exam such material with traditional methods. Infrared thermal imaging technology shoots carboform to obtain infrared thermal images. With variation of time and temperature, the change principle of thermal performance difference of carboform in different temperature can be compared and analyzed. Effective data and reasonable fitting time can be extracted to fit for data with power exponential function. Then, imaging functions were utilized to perform gray change, median filter, fuzzy contrast enhancement, edge detection so as to output images on fitted data. Defects of specimen can be found. Example of some carboform sample based on infrared thermal wave verified feasibility of the proposed method.

NEW STANDARDS FOR FEVER SCREENING WITH THERMAL IMAGING SYSTEMS

2013 ◽  
Vol 13 (02) ◽  
pp. 1350045 ◽  
Author(s):  
E. F. J. RING ◽  
A. JUNG ◽  
B. KALICKI ◽  
J. ZUBER ◽  
A. RUSTECKA ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Body Temperature ◽  
Human Body ◽  
Thermal Imaging ◽  
Imaging Systems ◽  
Contact Site ◽  
Infrared Thermal Imaging ◽  
Significant Difference ◽  
Human Body Temperature ◽  
Eye Region

Infrared thermal imaging has in recent years become more accessible and affordable as a means of remote sensing for human body temperature such as in identifying a person with fever. The implementation and operational guidelines for identifying a febrile human using a screening thermograph as documented in the ISO/TR 13154:2009 ISO/TR 80600 has been deployed for the screening of a total of 402 children. It was found that there was a significant difference between the temperatures measured in non-fevered patients and those with known fever, with the thermal imaging of the eye region being the most rapid non-contact site for measurement.

scholarly journals Device-Level Multidimensional Thermal Dynamics With Implications for Current and Future Wide Bandgap Electronics

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
James Spencer Lundh ◽  
Yiwen Song ◽  
Bikramjit Chatterjee ◽  
Albert G. Baca ◽  
Robert J. Kaplar ◽  
...  
Keyword(s):  
Steady State ◽  
Thermal Imaging ◽  
Thermal Characterization ◽  
High Electron Mobility Transistor ◽  
Wide Bandgap ◽  
High Electron ◽  
Thermal Dynamics ◽  
Practical Applications ◽  
Self Heating ◽  
Transient Thermal

Abstract Researchers have been extensively studying wide-bandgap (WBG) semiconductor materials such as gallium nitride (GaN) with an aim to accomplish an improvement in size, weight, and power of power electronics beyond current devices based on silicon (Si). However, the increased operating power densities and reduced areal footprints of WBG device technologies result in significant levels of self-heating that can ultimately restrict device operation through performance degradation, reliability issues, and failure. Typically, self-heating in WBG devices is studied using a single measurement technique while operating the device under steady-state direct current measurement conditions. However, for switching applications, this steady-state thermal characterization may lose significance since the high power dissipation occurs during fast transient switching events. Therefore, it can be useful to probe the WBG devices under transient measurement conditions in order to better understand the thermal dynamics of these systems in practical applications. In this work, the transient thermal dynamics of an AlGaN/GaN high electron mobility transistor (HEMT) were studied using thermoreflectance thermal imaging and Raman thermometry. Also, the proper use of iterative pulsed measurement schemes such as thermoreflectance thermal imaging to determine the steady-state operating temperature of devices is discussed. These studies are followed with subsequent transient thermal characterization to accurately probe the self-heating from steady-state down to submicrosecond pulse conditions using both thermoreflectance thermal imaging and Raman thermometry with temporal resolutions down to 15 ns.

Design of aspherical metal mirrors used in infrared thermal imaging systems

2005 ◽  
Author(s):  
Yinhua Cao ◽  
Lin Li ◽  
Guangjun Gao ◽  
Ying Zhang
Keyword(s):  
Thermal Imaging ◽  
Imaging Systems ◽  
Infrared Thermal Imaging

Scanning distortion analysis of infrared thermal imaging systems

2018 ◽  
Author(s):  
Xi Wang ◽  
Qingqing Peng ◽  
Lin Liu ◽  
Jiaqiang Yang ◽  
Xiaoyu Du ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Imaging Systems ◽  
Infrared Thermal Imaging ◽  
Distortion Analysis
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