Sensor for optical measuring of torque depending on relative rotation of ends

The torque sensor includes openings (9,9',10,10') on both rings (7,8) on two facing plates (5) of which one is shown, which are designed identically and are arranged assigned to each other. The openings (9,9') of the outer ring (7) are offset relative to those (10,10') of the inner ring (8) of each plate. A quarter of the circumferential pitch angle (3) of the openings are arranged displaced circumferentially by an angle. The torque neutral position for the two pairs of rings (7/7' or 8/8') respectively gives 50 percent covering of the openings. With the relative rotation of the plates in the two different pairs of rings, the degree of covering between the plates alters mutually in a manner such that the outer ring openings are more covered w.r.t. those of the inner rings in one torque direction, and vice versa for the other direction.