The FSI is the measurement device which sends pulses of light through the blade sensor arrays. Each sensor returns a reflection to determine the strain at that location. The FSI then outputs all sensor measurements in a data packet to the turbine controller, which uses the data for real time blade load calculations. Data can be sent on CAN, CANopen or serial.
The FSI is a small box, at 240 x 120 x 97mm. It is IP40 rated.
The FSI is designed to fit conveniently into the pitch cabinet.
Insensys use heavily armoured optical cables to connect the sensors inside the blade to the FSI. These are routed to pass through the centre of pitch rotation of the blade so that the cables don't stretch.
Sensors can be read up to 500m away from the FSI.
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