What's in the Insensys system?


 

Fibre Sensor Interrogator (FSI)

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.

 

Sensor patch

Fibre Bragg gratings are used to reflect light back to the Interrogator. As the grating is stretched, the wavelength it reflects changes. This is what the Interrogator uses to determine the strain at each sensor location.

The fibre optic cable is encased in a glass fibre patch. This protects the fibre, and the similar material types makes it easy to install into a blade. They are normally laminated over in the blade to ensure they are fully bonded and protected.

Sensors are IPx5 rated, and are typically 180 x 140mm.

 

Connecting to sensors inside blades

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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