Sensor apparatus with cleaning

A sensor apparatus comprising:

• a cylindrical sensor window defining an axis;
• and
• an air nozzle positioned at one end of the sensor window and shaped to direct airflow across the sensor window in a direction parallel to the axis;
• wherein the air nozzle extends around the sensor window in a circumferential direction relative to the axis;
• the air nozzle is formed of an inner edge and an outer edge each extending around the sensor window in the circumferential direction relative to the axis;
• the inner edge is circular with a radius at least as great as an outer radius of the sensor window;
• the outer edge includes a first portion and a second portion;
• the first portion of the outer edge has a semicircular shape with a radius smaller than the outer radius of the sensor window;
• the second portion of the outer edge extends around the sensor window from the first portion to the first portion at a constant radial distance from the inner edge;
• the air nozzle includes a first-portion panel for which the first portion of the outer edge forms an edge;
• and
• the first-portion panel has a frustoconical shape.

A sensor apparatus comprising:

• a cylindrical sensor window defining an axis;
• a first air nozzle positioned at one end of the sensor window and shaped to direct airflow across the sensor window in a direction parallel to the axis;
• and
• a second air nozzle shaped to direct airflow across the sensor window;
• wherein the first air nozzle extends around the sensor window in a circumferential direction relative to the axis;
• the first air nozzle is formed of an inner edge and an outer edge each extending around the sensor window in the circumferential direction relative to the axis;
• the inner edge is circular with a radius at least as great as an outer radius of the sensor window;
• the outer edge includes a first portion and a second portion;
• the first portion of the outer edge has a semicircular shape with a radius smaller than the outer radius of the sensor window;
• and
• the second portion of the outer edge extends around the sensor window from the first portion to the first portion at a constant radial distance from the inner edge.