本文選題：雙通道FTIR光譜儀　切入點(diǎn)：采樣誤差分析　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文

【摘要】：本文主要討論了雙通道傅里葉變換紅外光譜儀光譜復(fù)原方法及其實(shí)現(xiàn),深入研究了涉及到的關(guān)鍵問題,對采樣誤差對光譜圖質(zhì)量的影響、He-Ne激光干涉信號(hào)過零點(diǎn)重建方法,紅外干涉信號(hào)重建方法等問題進(jìn)行了深入研究,實(shí)現(xiàn)了光譜儀光譜復(fù)原系統(tǒng),并在實(shí)驗(yàn)中開展了實(shí)際應(yīng)用。首先,本文為了研究采樣誤差對光譜圖的影響,建立了誤差模型,從數(shù)學(xué)上建立了采樣誤差與光譜鬼線之間的理論聯(lián)系。同時(shí)對誤差模型進(jìn)行仿真,并且仿真了線性插值方法和三次樣條插值方法對He-Ne激光干涉信號(hào)過零點(diǎn)的復(fù)原效果。通過上述仿真驗(yàn)證了誤差模型的正確性,并得出了用一個(gè)He-Ne周期采樣點(diǎn)進(jìn)行三次樣條插值能夠最好的減少采樣誤差的結(jié)論,誤差范圍降低了 93%。其次,通過實(shí)驗(yàn)對比了不同方法重建紅外干涉信號(hào)對光譜質(zhì)量的影響。實(shí)驗(yàn)結(jié)果表明,只有兩個(gè)插值點(diǎn)的線性插值法重建的紅外干涉信號(hào)所得的光譜圖信噪比最高,信噪比平均提升5.7%。在上述研究的基礎(chǔ)上,實(shí)現(xiàn)了雙通道傅里葉變換紅外光譜儀光譜復(fù)原系統(tǒng)。此系統(tǒng)使用一束He-Ne激光干涉信號(hào)作為參照,同時(shí)復(fù)原兩束偏振紅外干涉信號(hào),然后對其進(jìn)行切趾和快速傅里葉變換得到兩幅具有不同偏振方向的光譜圖。
[Abstract]:In this paper, the spectral restoration method and its realization of dual-channel Fourier transform infrared spectrometer are mainly discussed. The key problems involved are deeply studied, and the effect of sampling error on the quality of spectral image is discussed. The method of zero-crossing reconstruction of He-Ne laser interference signal is discussed.The methods of infrared interference signal reconstruction are studied in detail. The spectral restoration system of spectrometer is realized, and the practical application is carried out in the experiment.Firstly, in order to study the influence of sampling error on spectral map, the error model is established, and the theoretical relation between sampling error and spectral ghost line is established mathematically.At the same time, the error model is simulated, and the effect of linear interpolation and cubic spline interpolation on the zero-crossing point of He-Ne laser interference signal is simulated.The correctness of the error model is verified by the simulation above, and the conclusion that cubic spline interpolation with a He-Ne periodic sampling point can best reduce the sampling error is concluded, and the error range is reduced by 933%.Secondly, the influence of different methods on spectral quality is compared.The experimental results show that the spectral signal to noise ratio of the infrared interference signal reconstructed by the linear interpolation method with only two interpolation points is the highest, and the average SNR is increased by 5.7.Based on the above research, a dual-channel Fourier transform infrared spectrometer spectral restoration system is implemented.In this system, a He-Ne laser interference signal is used as a reference, two polarized infrared interference signals are restored at the same time, and then two spectral images with different polarization directions are obtained by apodization and fast Fourier transform.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP391.41;O434.33

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