THE ELIMINATION OF BRIGHT CONTINUOUS SPECTRAL BACKGROUND IN SPECTROGRAM BY MEANS OF COHERENT OPTICAL PROCESSING
消除光谱图中强连续背景的相干光学处理方法

From the point of view of the optical information processing, we consider the spectrogram in which the spectral lines are immersed in the bright continuous background as a low contrast optical picture. By means of the coherent optical processing system and a special high-pass filter, the Fourier spectrum of the continuous background can be reduced and then the final result may appear as a spactrogram without continuous background. This may be considered as a new method for enhancement of the ratio S/N of a spectrogram.