宽谱段光纤光谱仪

Wide-Range Fiber Spectral Instrument Covering

为满足野外现场矿物分析、遥感地面验证光谱分析等的需要,研制了实现光谱覆盖范围在400～2500nm的宽谱段光纤光谱仪,介绍了仪器研制过程中的光学、机械与电子学设计。光学系统采用了光栅分光的水平反射式光路,对于不同的光谱探测谱段,采用了三路线阵探测器在光谱面的3个方向立体交错放置进行探测;用CPLD(complex programmable logicdevice)实现对三路线阵光电器件时序逻辑信号的发生与驱动;采用14位高速ADC进行数模转换;采用USB2.0实现通讯。仪器体积小、光谱分辨率高、信号质量和测量速度等方面均达到了满意效果,测试结果表明,仪器实现了宽谱测量,光谱数据理想。

To meet the requirements of outdoor field mineral analysis and remote sensing ground verification spectral analysis, the wide-range fiber spectral instrument covering 400 nm-2 500 nm was developed. The present article illustrates the design of the optical, mechanical and electrical parts of the instrument. The optical system utilizes grating horizontal-reflecting light route to implement the full coverage of the spectrum. Three line-array sensors are intercrossed in three directions on the spectrum surface to sense different spectrum ranges. CPLD device generates the sampling and driving temporal logic signals to the three line-array photoelectrical devices. Fourteen bits high speed AD converts the analog signals into digital ones. USB 2.0 is used for communication. The final results demonstrate that while implementing the measurement of wide spectrum, the instrument is improved in size, spectrum resolving power, signal quality and measuring speed. Ideal spectrum data were acquired.