Patent ID: 9744773
Date: 2017-08-29
CPC Classifications: B41J

Claim:
1. A method for determining characteristics of an ink in an inkjet printing system, the method comprising: subjecting the ink to an alternating signal of a first frequency to generate response signals from the ink, wherein the alternating signal is one of an alternating current signal and an alternating voltage signal, and wherein the response signals include at least a response voltage signal and a response current signal, the alternating signal being generated based on a clock signal of the inkjet printing system; comparing the response voltage signal to a predetermined voltage threshold, to generate a voltage phase signal; comparing the response current signal to a predetermined current threshold, to generate a current phase signal; tuning at least one of the predetermined voltage threshold and the predetermined current threshold to determine a balance point, wherein the balance point is indicative of concurrent transition of the voltage phase signal and the current phase signal from a logical ‘low’ to a logical ‘high’; and identifying a first relative phase difference between the voltage phase signal and the current phase signal based on the tuning, wherein the first relative phase difference is indicative of the characteristics of the ink corresponding to the first frequency.