基于CORDIC算法的波长调制光谱技术  

CORDIC-Based Wavelength Modulation Spectroscopy

作　　者：袁峰[1] 何亚柏[1,2] 姚路[2] 陈祥[1,2] 魏敏[1,2] 许振宇[2] 范雪丽[2] 胡佳屹 阚瑞峰[2] 

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230031 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所环境光学与技术重点实验室,安徽合肥230031

出　　处：《激光与光电子学进展》2017年第7期333-339,共7页Laser & Optoelectronics Progress

基　　金：国家973计划(2013CB632803);国家重大科学仪器设备开发专项(2014YQ060537)

摘　　要：介绍了波长调制光谱技术的检测原理,分析了传统的基于现场可编程门阵列(FPGA)的波长调制解调算法的优缺点,进而提出了一种基于坐标旋转数字计算机(CORDIC)原理的FPGA波长调制解调算法。介绍了该算法的原理和基于FPGA的实现过程,总结其相对于传统算法在精度、资源占用、耗时等方面的优势。最后给出该算法的综合和仿真结果,通过和理论对比验证了该算法的准确性,并且比较了两种算法的计算精度和综合后的资源占用情况。This paper introduces the detection principle of wavelength modulation spectroscopy, and analyzes the advantages and disadvantages of the traditional field programmable gate array （FPGA）-based wavelength modulation and demodulation algorithm. Then this paper proposes a FPGA wavelength modulation and demodulation algorithm based on coordinated rotation digital computer （CORDIC） principle. The principle of the proposed algorithm and the implementation process based on FPGA are introduced. Its advantages relative to the traditional algorithm in precision, resource occupancy, time consumption and other aspects are summed up. Finally, synthesis and simulation results of the proposed algorithm are given. The computational accuracy of the algorithm is verified by comparing the simulation result and the theoretical result. The accuracy and synthesized resource occupancy of the two algorithms are also compared.

关 键 词：光谱学 数字锁相放大器 二次谐波 坐标旋转数字计算机 现场可编程门阵列 

分 类 号：O433[机械工程—光学工程]