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The other end of the optical fiber is connected to the Polychromator system, which consists of the grating and a linear CCD array sensors.

It can obtain the spectrum within 175~525 nm. Whole spectrum is obtained simultaneously with 1024 channels of CCD sensors. Therefore, the resolution of the wavelength is about 0.34 nm.

CCD output is transferred with A/D converter with 12 bits and recorded.