Infrared thermography is a whole field, noncontact, and nondestructive characterization technique widely used for the investigation of subsurface features in various solid materials (conductors, semiconductors, and composites). Increased demand for greater subsurface probing in thermal nondestructive testing is often thwarted by the probing high peak power into the sample, for which narrow pulse operation is usually used. The technique of pulse compression offers a means of increasing the average power available to illuminate test specimen without any loss of the depth resolution needed for the tactical requirements. This is accomplished by transmitting a wide pulse in which the incident heat flux is frequency modulated and then, by proper signal processing methods, causing a time compression of the received signal to a much narrower pulse of high effective peak power. For the demonstration, a mild steel sample having flat bottom holes at various depths is introduced and detection capability of the proposed approach has been studied.
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September 2008
Research Article|
September 11 2008
Pulse compression approach to infrared nondestructive characterization
Ravibabu Mulaveesala;
Ravibabu Mulaveesala
a)
Electronics and Communication Engineering Group,
PDPM-Indian Institute of Information Technology Design and Manufacturing
, Jabalpur, IT Bhavan, GEC Campus, Gokalpur, Jabalpur 482011, India
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Jyani Somayajulu Vaddi;
Jyani Somayajulu Vaddi
Electronics and Communication Engineering Group,
PDPM-Indian Institute of Information Technology Design and Manufacturing
, Jabalpur, IT Bhavan, GEC Campus, Gokalpur, Jabalpur 482011, India
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Pushpraj Singh
Pushpraj Singh
Electronics and Communication Engineering Group,
PDPM-Indian Institute of Information Technology Design and Manufacturing
, Jabalpur, IT Bhavan, GEC Campus, Gokalpur, Jabalpur 482011, India
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a)
Electronic mail: [email protected].
Rev. Sci. Instrum. 79, 094901 (2008)
Article history
Received:
May 31 2008
Accepted:
August 08 2008
Citation
Ravibabu Mulaveesala, Jyani Somayajulu Vaddi, Pushpraj Singh; Pulse compression approach to infrared nondestructive characterization. Rev. Sci. Instrum. 1 September 2008; 79 (9): 094901. https://doi.org/10.1063/1.2976673
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