Figure 5

Lift-off compensation; (a) Determination of the mean lift-off curve for lift-off compensation in the array probe, (b) signal-to noise ratio (SNR) as a function of lift-off d and associated fingerprint images of a sample at d = 0.0, 0.7 and 1.4 mm. The SNR here is defined as the ratio of the mean absolute signal amplitude to the standard deviation of the noise. The scale is linear.