US Patent 10908002 Sensor airflow apparatus

An apparatus includes a housing defining a chamber and including a panel including an aperture, a sensor fixed inside the chamber and having a field of view through a lens and the aperture, and an annular disc attached to the sensor concentrically around the lens and including a radially outer edge contactlessly exposed to the chamber. An annular slot is defined by the disc. The slot extends at least 180° around the lens.