Rotating sensor assembly

A sensor assembly comprising:

• a base;
• a housing mounted to the base and rotatable relative to the base around an axis in a direction of rotation;
• a sensing apparatus inside the housing and rotatable with the housing;
• and
• a sensor window extending from a point on the housing in a direction that is radially outward and circumferential relative to the axis, the sensor window being flat;
• wherein the sensing apparatus has a field of view through the sensor window;
• an exterior surface of the sensor window faces in a direction that is radially outward and circumferentially in the direction of rotation relative to the axis;
• the housing includes an outer wall having a partial cylindrical shape extending circumferentially at a constant outer radius from the axis;
• and
• the sensor window extends from a point nearest the outer wall in the direction that is radially outward and circumferential relative to the axis.