Stick-on strain sensors that can accurately measure the flexion of joints, big and small, have turned out hard to make. Piezoresistive devices tend to have a delayed response and are not stable in the long-run, while capacitive sensors are not very sensitive and nearby electromagnetic fields tend to interfere with them. Now researchers at South Korea’s KAIST institute of technology have developed a completely unique approach to strain sensing that relies on detecting the optical transmittance of a novel material…
