Immersed active infrared self-cleaning secondary sedimentation tank sludge blanket induction device and application method thereof

An immersed infrared self-cleaning secondary sedimentation tank sludge induction device comprises: an upper (1) and lower sleeve (2) connected to form a communicated inner cavity. A set of infrared emitters (3) and receivers (4) are located on an inner wall of the upper sleeve and are oppositely arranged. A transparent hard ring (5) is annularly adhered to front sides of the infrared emitters and the infrared receivers. A push rod assembly moveable up and down in the inner cavity is used for cleaning the transparent hard ring. A sludge outlet hole (101) and a water outlet hole (102) located below the sludge outlet hole are arranged on the upper sleeve. A bearing plate (201) is arranged in the inner cavity of the lower sleeve. A clean water cavity (202) is arranged below the bearing plate. A water inlet hole (203) and feeding hole (204) are connected with a water outlet hole through a cleaning pipe (6) and is arranged on the clean water cavity. A sludge inlet cavity (206) with a sludge inlet ...