Wireless technology uses thousands of tiny liquid crystals on a flexible substrate to sense heat.

Measurements of thermal diffusivity used a wireless, active e-TLC, with a transmission antenna located about 10cm away that was adjusted to achieve a peak change in temperature of a few degrees (RF power below 2.5W/Kg at frequencies between 1.95GHz and 2.35GHz, was tuned to match the response of the receiver antenna on the e-TLC). Both digital and infrared cameras were focused on the device with a distance of 30cm. Videos with around 60s duration recorded the changes in temperature. Credit: John A. Rogers, University of Illinois