Constant-temperature optical system for ultraviolet absorption spectrum measurement

The utility model provides a constant temperature optical system for ultraviolet absorption spectrum measurement, which comprises a constant temperature box shell, an ultraviolet light source, a gas absorption cell and an ultraviolet spectrograph which are connected in sequence are arranged in the constant temperature box shell, the gas absorption cell comprises an incidence module, an absorption cell cavity and an emergence module which are connected in sequence, the absorption cell cavity comprises an inner cavity body and an outer cavity body, two ends of the outer cavity body are respectively recessed inwards to form grooves, the incident module and the emergent module are respectively arranged in the two grooves, the inner cavity body is arranged between the two grooves, a first optical lens is arranged in the incident module, a second optical lens is arranged in the emergent module, and the second optical lens is arranged in the outer cavity body. The first optical lens and the second optical lens are b