The multichannel parallel measuring technique was successfully applied to conventional scanning spectrometer

and the spectral coded measuring system based on WDP500-2A plane grating monochrometer has been developed and tested. With the entrance slit and exit slit of the monochrometer replaced by two multislit encoding mask respectively

the system not only has high radiation flux but also achieves the advantage to measure multispectral elements simultaneously

all these have remarkably improved its performance to analyze the weak radiation spectrum. To simplify the encoding kinetic mechanism

the masks which have cyclic encoding configuration have been designed. The slits in the encoding mask have been made into the shape of circular arc so as to compensate the spectral line curvature of the grating and reduce the metering error effectively.