Subsection-filtering method applied in optoelectronic signal processing of the liquid drop analyzer

Liquid drop fingerprint can be obtained through fiber-capacitive drop analysis technology as the fiber signal changes with the drop volume which can be represented by the capacitive signal during the drop growth. However, if the fiber or capacitive signals are filtered by the normal low-pass filter method, the fingerprint would be distorted because of the capacitive signal's saw-tooth style and fiber signal's periodically abrupt property. In the paper the subsection-filtering method is explored and analyzed, in which firstly separates the signals according to drop growth period and then filters every subsection respectively. Experiments improves that it is an effective way to solve the signal distortion problem, which usually happens when filters the fiber or capacitive signal during the signal mutation period.