Spectral radiation intensity measurement at ultraviolet wavelengths is important for the material composition analysis of
transient extended area light sources. Here we developed transient ultraviolet multi-spectral spectrometer which is
utilized to measure relative spectral radiation intensity distributions of remote transient as well as steady-state extended
area light sources in the wavelength range (0.22-0.40) μm. Simultaneously the device also shows different spectral
radiation intensity distribution curve of the transient radiation source along with time changes. This spectrometer consists
of mobile collimation lens, Cassegrain imaging system, grating spectrograph, high speed data acquisition system and
computer software. Since ultraviolet spectral radiation is severely absorbed in air transmission, firstly the Cassegrain
system which has high reflectance in ultraviolet wavelength range is used to image the extended area light source onto
the entrance slit of spectrograph, in order to markedly improve the light gathering power of the device. The spectrograph
uses plane blazed grating to disperse spectrums which are focalized as the focal plane for detection by ultraviolet
response enhancing array CCD detector. Secondly, to resolve spectrum acquisition problem of nanosecond transient light
sources, we adopt CCD drive technology programmed by CPLD and fixed phasic high speed data acquisition method.
Finally, the spectral distortion of the spectrograph is reduced by using non-parametric kernel regression de-noising
algorithm and convolution algorithm in order to improve the spectral resolving power of the device. So we
experimentalize for spectral radiation intensity distributions of remote transient and steady-state extended area light
sources, then the uncertainty of measurement results is analyzed.