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In this paper, a structural health monitoring approach is proposed involving Laser Doppler Vibrometers (LDVs) installed on a vehicle. Relative velocities are measured to obtain the Rate of Instantaneous Curvature of the velocity (RIC). Standard deflection curvature is shown to be sensitive to local damage. Instantaneous Curvature (IC) is likewise sensitive but calculated using measurements provided from a vehicle. RIC is obtained using the first derivative of IC with respect to time.A damage indicator obtained from RIC, the Difference Ratio, is tested both in noise-free and noisy conditions.