Development Of Biomaterials For Enhancing The Thermographic Resolution In Detection Of Bone Disease

Abstract

Infrared thermography is one of the major non-destructive testing techniques which newlineis used for the inspection of any kind of surface or detecting any sort of abnormality newlinein an object by measuring or mapping the temperature profile of the surface. The newlineinfrared cameras detect the radiations emitted by an object which are at a newlinetemperature greater than absolute zero. Thermography can be classified into passive newlineand active thermography. Passive thermography involves mapping the temperature newlineprofile of a sample surface in the absence of any external heat stimulus. Whereas, in newlinethe active Thermography (AT) the external stimulus is applied to the target either by newlineheating or cooling and further observing the thermal response of the target by an newlineinfrared camera. There are various modes by which the external stimulus is being newlineapplied to the sample like Pulsed thermography (PT), Lock-In Thermography (LT) newlineand Pulsed Phase thermography (PPT). PT involves briefly heating the specimen newlinewith a short duration high peak power thermal stimulation and then recording the newlinetemperature response of the sample whereasLT involves mono-frequency sinusoidal newlinethermal excitation at a particular angular frequency to be introduced inside the test newlinespecimen. It has been observed that PT requires high power and LT lacks depth newlinedetection of abnormalities. Hence, to overcome the drawbacks Frequency newlineModulated Thermal Wave Imaging (FMTWI) methods have been introduced to newlineimprove the depth resolution of detecting defects lying at different depths, in lesser newlinetime compared to LT and with less peak power of heat source compared to pulsed newlinethermographic method. FMTWI also uses a post-processing scheme to improve newlinedepth penetration and image resolutions of the thermographic image; hence, this newlinework utilized a pulse compression-based post processing technique. newlineThis research work also encourages us to seek out bio-materials that can be helpful newlineto enhance the detection capabilities of active thermography. Hence, in this work, newlinewe used frequency modu