In thin film technology, strain-sensitive materials are condensed onto the metal surface of the sensor via PVD (sputtering) and eventually structured using photolithography, making extremely precise circuit structures possible. Moreover, thin film technology allows us not to use organic glue if it would interfere with the setup (radioactive radiation).
Coating force sensors directly is only cost-effective if the sensor is small enough, as the price for coating increases in proportion to the area to be coated. Higher nominal loads require a bigger sensor body. We therefore need a different approach to cost-effectively use thin film technology in force sensor technology.