Yes, that's a definite possibility - or just 180° either way, for both sweeps - or perhaps even less. Some of that would be dependent on the OP's need for speed of acquisition, as naturally it will take time to deaccelerate, reverse direction and accelerate the sensor. There are potentially a great many data points to be taken and compared.Or you could arrange to sweep 360 degrees clockwise and then 360 degrees counterclockwise and repeat - no slip rings needed.