摘要
近红外可见光傅里叶变换光谱仪需要使用倍频后的参考激光千涉信号作为采样信号。由于锁相环倍频无法适用于低频的非周期信号,而传统的数字倍频方法误差又较大,因此提出了一种经过改进的基于传统数字倍频方法的算法,并对其进行了仿真和验证。实验结果表明,算法改进后,输出波形的非均匀性误差从-2%^+1.6%提高到了-0.82%^+0.4%,说明由倍频产生的非均匀性误差得到了良好改善。
A near infrared and visible light Fourier transform spectrometer needs to use a multiplied reference laser interfere signal as its sampling signal. Since a phase-locked loop frequency multiplier is not suitable for low frequency non-periodic signals and the traditional digital multiplier method may generate a large error, an improved algorithm based on the traditional digital multiplier method is put forward. The algorithm is simulated and verified. The result shows that when the improved algorithm is used, the non-uniformity error of output waveform is improved from the range of -2% to ＋1.6% to the range of-0.82% to ＋0.4%. The non-uniformity error is improved greatly.
出处
《红外》
CAS
2014年第5期29-33,41,共6页
Infrared
关键词
傅里叶变换光谱仪
近红外可见光波段
数字倍频方法
Fourier transform spectrometer
near infrared and visible light
digital multiplier
