弱辐射光谱编码测量技术的研究

本文将多通道并行检测技术应用于常规的扫描型光谱仪,基于国产WDP500-2A型平面光栅单色仪设计了光谱编码测量系统并进行了实验验证.该系统利用两块多狭缝编码模板分别取代原仪器中的入射狭缝和出射狭缝,既增大了进入仪器的辐射通量,又实现了多个光谱元同时测量的多通道优点,大大提高了仪器分析弱辐射信号的能力.为简化编码运动机构,文中设计了具有循环编码构形的编码模板.模板上的狭缝设计成圆弧状以便有效地补偿衍射光栅的光谱线弯曲,减小测量误差.

Measuring technique of weak radiation spectrum

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.