In this paper an instantaneously recorded baseline
method is proposed using piezoelectric transducers for damage
localisation under varying temperature. This method eliminates
need for baselines required when operating at different temper-
atures by mapping a baseline area onto the interrogation area.
Instantaneously recorded baselines and current interrogation
signals are calibrated based on the sensor mapping. This allows
extraction of damage scatter signal which is used to localise
damage. The proposed method is used to localise actual impact
damage on a composite plate under varying temperatures. The
method is also applied to a stiffened fuselage panel to accurately
localise impact damage.