The TRAQC System

Inspired by graphical printing, where printed bar codes are used as test patterns, our custom 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 overall quality.

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.

TRAQC Benefits:

– Contactless Measurement

– In-Line Quality Testing

– Easy Installation on Prior Hardware

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.