Patent ID: 7992956

Claim:
A method of calibrating an inkjet print nozzle comprising: dispensing ink onto a substrate with an inkjet print nozzle, the nozzle set at a firing pulse parameter; measuring a light transmittance characteristic through the dispensed ink while the dispensed ink is on the substrate; determining a volume of ink dispensed based on the measured transmittance characteristic; adjusting the firing pulse parameter of the inkjet print nozzle based on a difference between the determined volume of ink dispensed and an expected ink volume level; and prior to dispensing ink on the substrate: illuminating the substrate in the absence of dispensed ink; capturing light that has been transmitted through substrate; and determining a baseline light intensity level from the captured light, wherein the measuring of a light transmittance characteristic of the dispensed ink includes measuring an intensity of captured light transmitted through the dispensed ink and determining a ratio between the measured intensity of the captured light and the baseline light intensity level; and wherein the determining of a volume of ink dispensed includes ascertaining a volume of ink that corresponds to the ratio of the measured intensity of captured light and the baseline light intensity level.