Methods of firing a cordierite green body to form a fired cordierite body. The device includes an optical layer, a substrate, at least one electronic circuit layer with nearly wireless architecture, an array of actuators, power electronic switches, a reactive force element, and a digital controller. Voltage from each of the probes are monitored over a plurality of time intervals. A gas is injected into the tube to create a vortex flow within the tube. A cryptographic-key number is assigned to the cryptographic key. The converter is configured to exponentially convert the error signal to the frequency.