Filtering radiometer

The invention discloses a filtering radiometer, which comprises a detection unit and a lens unit. The detection unit comprises a detection shell in which a unit detector is packaged, the lens unit comprises a plurality of optical modules, an optical element is packaged in each optical module, and the plurality of optical modules are adaptively connected; and the detection shell is adaptively connected with the plurality of optical modules. Through the implementation of the invention, the modular design of the optical element is carried out on the lens part, the configuration of parameters suchas wavelength, field of view and polarization angle can be realized by replacing the optical module with an independent function, the modular design of the optical element can improve the effective reuse of the optical module, and a functional module library of the lens can also be formed; and configuration adjustment of a user is facilitated during subsequent application. Meanwhile, the split design of the detection uni