Abstract
The paper deals with estimation of natural frequencies using IR camera. The object was excited using random noise and infrared camera registered radiation of the object. The measured data was processed by lock-in thermography, when the lock-in frequency was changed in analyzed frequency's region. The output of lock-in process was analyzed. Natural frequencies were detected on the changes of real parts and amplitudes of output infragrams. The significant symptom is detection of patterns in infragrams.
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