摘要
在光纤傅里叶变换光谱仪(FFTS)中由于抽样误差和光纤色散等原因引起相位误差导致谱线畸变．乘积法在频域实现相位误差校正,通过短双边干涉图和单边干涉图分别计算出低分辨率和高分辨率的相位谱及幅度谱,并用两个相位谱差的余弦乘以高分辨率的幅度谱得到相位误差校正的谱．讨论了两种截断函数情况下用乘积法计算得到相位误差校正后的光谱．相位校正后的谱和标准谱线比较,二者基本重合．在光纤色散存在的条件下,乘积法仍然有效地消除了谱图中相位误差,证明了FFTS中乘积法校正相位误差的有效性．该方法比双边干涉图法具有较高的光谱分辨率,光谱的基线并不会因噪声而升高,且比卷积法计算简单、速度快、实时性好,可广泛应用到FFTS中．
The phase error presents for sample error and dispersion of the fiber in optical fiber Fourier transform spectrometer （FFTS）, distortion of spectrum can be induced. Multiplicative method can correct phase error in frequency domain. The calculated low-resolution phase spectrum with short two-sided interferogram corrects the high-resolution spectrum through high resolution amplitude spectrum multiplied by the cosine of the difference of low resolution and high resolution phase spectrum by using multiplicative procedure which is operated in frequency domain. The results show that multiplicative method is also effective in FFTS. Phase corrected spectrum agrees well with spectrum from commercial grating spectrum in- strument. The method, which is not only simpler and faster than the others, but also has high resolution, and remains the features of noise and keeps the baseline immune to noise, can be widely applied in FFTS.
出处
《量子电子学报》
CAS
CSCD
北大核心
2007年第3期300-305,共6页
Chinese Journal of Quantum Electronics
基金
中国科学院合肥研究院院长基金(20020603)
关键词
光谱学
傅里叶变换
光纤干涉仪
相位误差
spectroscopy
Fourier transforms
fiber interferometer
phase error
