The TRAQC System

Inspired by graphical printing, where printed bar codes are used as test patterns, our patented conductive patterns act as quality control bars (QCBs). Since the QCBs are printed with products, any printing problems will be present in the patterns and tracked with the terahertz beam. Various patterns can be used to monitor real-time information about print parameters and the current print run’s adherence to set standards.

TRAQC Features:

-Simple, fast laser measurement that gives continuous feedback on your printing process as it happens

-Small footprint that is easily installed on existing print lines and can be moved to monitor different areas on the print bed

-Monitors all relevant parameters for your printing jobs (conductivity, substrate stretching, dot gain) and can be customized to measure more parameters as needed

-Can provide reports with compiled statistics on your print jobs so that you can understand your processes better

Terahertz Technology:

Light is the fastest probe available, and has the benefits of being a non-contact measurement method. Using light in the terahertz (THz) range provides intrinsic sensitivity to the electric conductivity of the illuminated QCB. This high sensitivity to conductivity is what allows for the evaluation of print geometry, conductivity, and ultimately functionality.

Pattern Design:

TRAQC’s patented quality control patterns interact with the incident THz light in known ways. The response from the light passing through the pattern allows for the extraction of changes in ink quality, overall conductivity, and various other parameters. Each of these is critical for proper device functionality.

Publications and Patents:

2019 Article in Sensors

Roll 2 roll quality control for printed electronics

Test patterns are used to monitor printing conditions and quality in many printing industries.

pattern used by traqc for quality control for printed electronics

Patterns are printed using the same ink as devices to directly measure conductivity and other critical printing parameters.

graphics showing how sensitive is the quality control comparing to traditional systems

Comparison of the conductivity values obtained by a two microprobe multimeter, four-point probe, and THz spectroscopy.

Comparison between optical microscopy and THz results, where normalized transmission from THz-TDS is plotted as a function of the metal occupancy.