Abstract: A sensor assembly includes a housing, a sensor unit attached to the housing, and a gutter fixed relative to the housing. The sensor unit includes a cylindrical shell defining a vertical axis. The cylindrical shell extends above a highest point of the housing. The cylindrical shell is rotatable around the axis relative to the housing. The cylindrical shell includes a lower edge and extending upward along the axis from the lower edge. The gutter is elongated along the lower edge and positioned directly below the lower edge relative to the axis. The gutter defines an airflow outlet from the housing radially inside the gutter relative to the axis. The sensor unit defines an airflow inlet radially inside the lower edge relative to the axis and positioned to receive airflow from the airflow outlet.

Abstract: An assembly includes a housing defining a pressurized chamber. The assembly includes a sensor supported by the housing. The assembly includes a shell enclosing the sensor and rotatable relative to the housing, the shell enclosing a second chamber in fluid communication the pressurized chamber, the housing and the shell defining a gap therebetween. The assembly includes a ring supported by the housing, the ring defining an internal passage having an exhaust vent at the gap.

Abstract: A sensor assembly includes a sensor including a cylindrical sensor window defining an axis, a cover fixed relative to the sensor, and a duct mounted to the sensor and extending through the axis. The cover is positioned to expose a circumferential portion of the sensor window. The circumferential portion extends circumferentially relative to the axis from a first end adjacent to the cover to a second end adjacent to the cover. The circumferential portion includes a midpoint circumferentially between the first end and the second end. The duct includes an inlet and an outlet. The outlet extends circumferentially from the first end of the circumferential portion to the second end of the circumferential portion. The duct includes a deflector positioned to direct airflow from the inlet to the outlet at the first end and second end of the circumferential portion before the airflow reaches the midpoint of the circumferential portion.