Filtering method for interferogram of spatial heterodyne spectrometer
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摘要: 在分析空间外差光谱仪干涉图生成及特点的基础上，提出了基于改进旋滤波的干涉图降噪方法。该方法是在干涉条纹的切线方向进行滤波，能够在不改变干涉图条纹细节的基础上减少干涉图中的随机噪声和暗斑噪声的影响。同时该方法还能有效降低平均光谱的背景噪声，提高特征光谱与背景噪声的信噪比，结果显示旋滤波方法对加入噪声前后干涉图的平均光谱背景噪声信噪比改善分别为47%和240%，能够将一些峰值较小的特征谱从背景噪声中提取出来，提高空间外差光谱技术对一些弱特征光谱的识别率。Abstract: A denoising method for interferogram was proposed based on the improved spin filtering by analyzing the production and characteristics of the interferogram of spatial heterodyne spectrometer. Filtering was carried out on tangent fringe-pattern to reduce the influences of random and dark spot noises without changing the details of fringe-pattern. In addition, the background noise of average spectrum was effectively decreased, the ratio of characteristic spectrum to background noise was increased. Results show that by using the spin filter method, the SNR of the average spectrum of interferogram is improved by 47% without noise and 240% with noise, respectively, and the characteristic spectra with small peak values can be extracted from the background noise to improve the recognition rate of spatial heterodyne spectroscopy as far as weak characteristic spectrum is concerned.
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Keywords:
- remote sense /
- spatial heterodyne spectrometer(SHS) /
- interferogram /
- spin filtering /
- denoising
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［1］ROESLER F L，HARLANDER J．Spatial heterodyne spectroscopy：interferometric performance at any wavelength without scanning［J］．SPIE，1990，1318：23 4- 243．
［2］HARLANDER J，ROESLER F L，GARDON J G，et al．SHIMMER：a spatial heterodyne spectrometer for remote sensing of Earth-s middle atmosphere［J］．Applied Optics，2002，41(7)：1343-1352
［3］MIERKIEWICZ E J，ROESLER F L，HARLANDER J，et al．First light performance of a near-UV spatial heterodyne spectrometer for interstellar emission line studies［J］．SPIE，2004，5492：751-766．
［4］MILLIGAN S，HOWARD J，LAUBSCHER B，et al．Optical design of an imaging spatial heterodyne infrared spectrometer［J ］．SPIE，1999，3698：869-881．
［5］LIN Y L，SHEPHERD G，SOLHEIM B，et al．Introduction to spatial heterodyne observations of water(SHOW ) project and its instrument development［C］．(S.l.):［s.n.］,2005．
［6］叶松，方勇华，洪津,等．空间外差光谱仪系统设计［J］．光学精密工程，2006，14(6)：961-964．
YE Song，FANG Yong-hua，HONG Jin，et al．System design of spatial heterodyne spectrometer［J］．Optics and Precision Engineering，2006，14(6)：961-964．(in Chinese with an English abstract)
［7］叶松，熊伟，乔延利，等．空间外差光谱仪干涉图数据处理［J］．光谱学与光谱分析，2009，29(3)：848-852．
YE Song，XIONG Wei，QIAO Yan-li，et al．Data processing for interferogram of spatial heterodyne spectrometer［J］．Spectroscopy and Spectral Analysis，2009，29(3)：848-852．(in Chinese with an English abstract)
［8］熊伟，施海亮，汪元均，等．近红外空间外差光谱仪及水汽探测研究［J］．光学学报，2010,30（5）：1511-1515．
XIONG Wei，SHI Hai-liang，WANG Yuan-jun，et al．Study on near-infrared spatial heterodyne spectrometer and detection of water vapor［J］．Acta Optica Sinica，2010，30(5)：1511-1515．（in Chinese with an English abstract）
［9］吴军，王先华，方勇华，等．空间外差光谱技术应用于大气二氧化碳探测的能力分析［J］．光学学报，2011,31（1）：10101001．
WU Jun，WANG Xian-hua，FANG Yong-hua，et al．Abilitiy analysis of spatial heterodyne spectrometer in atmospheric CO2 detection［J］．Acta Optica Sinica，2011，31(1)：0101001．(in Chinese with an English abstract)
［10］YU Q F．Spin filtering processes and automatic extraction of fringe centerlines in digital interferometric patterns［J］．Applied Optics，1988，27(18)：3782-3784．
［11］YU Q F．Calculation of strain from a single moiré by filtering and normalizing an interferogram［D］．Germany：Bremen University，1996．
［12］YU Q F，ANDRESEN K，OSTEN W，et al．Noise-freenormalized fringe patterns and local pixel transforms for strain extraction［J］．Applied Optics，1996,35(20)：3783-3790．
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