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Optical Technology

The technology for our Optical E200 ORT Series Torque Transducers is based on an extensively proven and developed measurement principle whereby two discs with segmented gratings are positioned on the shaft so that the opaque sectors on one disc partially obscure the clear sectors on the other. Light passes through the sectors and is detected by photovoltaic detectors. The intensity of light beams, which is constantly monitored, is modulated by the applied torque and produces an electrical output that is used to provide a precise indication of the torque transmitted by the shaft. The light intensity is automatically controlled within the transducer body by a monitor cell. Lamps used to provide the light source are selected to ensure they have a long life and high stability.

The use of this measurement technique results in a transducer being able to sense torque bi-directionally. Very high full-scale sensitivity can be achieved with fast electrical responses up to 50kHz and low inertia. As the measurement is non-contact it has also has complete freedom from brushes and complex electronics on the shaft, which are often found in traditional torque measurement systems.