Drop detection method and apparatus

Details Drop detection method and apparatus Drop detection method and apparatus

A - Human Necessities

61

M

A61M 5/168 (2006.01) G01V 8/14 (2006.01) G02B 5/10 (2006.01)

Patent

CA 2102424

A drop detector system and method are provided for a drop detector of the type including a drop chamber (30) and an electro-optical sensor (40). The detector system detects drops passing through an optical sensing path between a detector (40) and at least one light source (38). In response to the detection of a drop passing through the optical path, the detector produces an output signal. A capacitator is connected between the detector and an amplifier to block the DC component of the output signal. After amplifica- tion, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber. The detector and light source or sources are ar- ranged to detect drops falling in the drop chamber at virtually any angle and is virtually any ambient light condition.

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