Torque measurement in turbofan

Short description
Measuring shaft torque is key to understand aircraft engine behavior. Nevertheless space around engine shaft is limited and current torquemeters or telemetry systems cannot be easily implemented.
The aim of this CFP is to develop a torque measurement system without telemetry for engine testbench (possibility to use on a flying test bench would be an asset but is not mandatory it will not be embedded on a commercial flight) Please refer to the full and formal topic descriptions published in this call.