Introduction: The optical lens spectral transmittance measurement system can measure the optical lens spectral transmittance (optical lens transmittance > 10%), measuring lens aperture: 0 ~ 050mm (selected by changing the diaphragm), the maximum length is 600mm Performance characteristics: Transmittance accuracy: +2% (optical lens transmittance > 10%) 300mm focal length three grating monochromator, automatic scanning and grating switching Spectral range: 380 ~ 2500nm Automatically control the electric moving table to adjust the measured optical system to move to the appropriate position along the optical axis Bromine tungsten light source with chopper and high stability and steady current Spectrometer control software and filter wheel control software, output data acquisition and analysis calculation software, star measurement parameters are automatically saved and printed directly