Spectrum irradiance standard light source for ultraviolet optical instrument radiometric calibration

The invention provides a spectrum irradiance standard light source which is used for radiometric calibrations of ultraviolet optical instruments, which comprises a light source component, a lifting holdfast, a collimating component and a lamp chamber, wherein a window which is used for output xenon lamp radiations is opened on the front end of the lamp chamber, an xenon lamp power supply is connected with an xenon lamp electrically, a port of a cylinder lens hood is communicated with the window which is on the lamp chamber and installed concentrically, a piece of lens and a diaphragm are arranged in turn on an xenon lamp radiation light path inside the lens hood, the xenon lamp is located on the focus of the lens, the diaphragm is located on the other side of the lens, the collimating component and the lamp chamber are installed commonly on the lifting holdfast. An extra-quiet xenon lamp which is selected by the invention has a short arc xenon lamp which has a comparatively strong radiation strength in an ult