Light scattering drop detect device with volume determination and method

摘要

One aspect is a drop detection arrangement including a light source for projecting a light beam for scattering light off of an ejected drop. The arrangement includes a light collector configured to collect the scattered light off the ejected drop and configured to process scattered light into an output signal. The arrangement includes a controller configured to receive the output signal from the light collector, to calculate the velocity of the ejected drop and to determine the volume of the ejected drop using the output signal and the velocity of the ejected drop.