Optical detection system and method capable of automatically removing foreign substances

An optical detection system capable of automatically removing foreign substances comprising an optical sensing device, the optical sensing device includes:

• a housing having an opening on one side thereof;
• a transparent cover disposed at the opening, the housing and the transparent cover jointly define an internal space of the optical sensing device;
• an optical sensor provided in the internal space of the optical sensing device;
• a lens module provided between the transparent cover and the optical sensor;
• a piezoelectric component, wherein in the internal space of the optical sensing device, the piezoelectric component is provided at an edge of the transparent cover;
• and
• a sealing material having flexibility and stiffness, which has an annular flake shape, is provided between the edge of the transparent cover and an edge of the piezoelectric component, and extended and fixed to the housing to seal the internal space of the optical sensing device;
• wherein
• the piezoelectric component performs vibration, and the vibration is transmitted to the transparent cover through the sealing material to remove foreign substances from the transparent cover.