Method and apparatus for the detection of density differences in a piece of tissue

摘要

The device comprises an optical reflection sensor (1), an op-amp buffer circuit (3) with the input electrically connected to the output of the optical sensor (1), means (2) for calculating the mean and delaying the signal sampled at the output of the sensor (1), means (4) for differential amplification of the output signals, respectively, of the buffer circuit (3) and of the means (2), and means (5) for comparing the output signal of the differential amplification means (4) with a known and predetermined signal. IMAGE