Improving spectral property of light source to increase signal-to-noise ratio of optical multichannel analyzer in measurement of absorbances

In the present paper we report that the spectral property of light radiation was improved by using the method of increasing intensity of short wave radiation for increasing singal-to-noise ratio (S/N) of CCD-OMA in measurement of sample's absorbance in visible light-region especially short wave region. The signal-re-noise ratio resulting from the recording of short wave region for improved light source was increased by 8 times as high as that of a general Wlamp, As demonstrated by the experiment,absorbance spectrum with high S/N ratio can be obtained in the entire visible light region by using the improved light source in the measurement of absorbance.