發(fā)布時(shí)間：2018-06-02 14:35

  本文選題：自混合干涉 + 兩路反饋��； 參考：《南京信息工程大學(xué)》2017年碩士論文

【摘要】：光反饋?zhàn)曰旌细缮嫘?yīng)(OFSMI)是指激光器輸出光被外部物體反射或者散射后,部分光反饋回激光器諧振腔內(nèi),并與腔內(nèi)光產(chǎn)生混合,導(dǎo)致激光器輸出功率和頻率發(fā)生改變,形成自混合干涉效應(yīng)。自混合干涉與傳統(tǒng)的雙光束干涉相似,但在理論上又與傳統(tǒng)的干涉不同,且二者的特性也有所差異。光反饋?zhàn)曰旌细缮鏈y(cè)量較傳統(tǒng)的干涉測(cè)量具有結(jié)構(gòu)簡(jiǎn)單、易準(zhǔn)直、光路緊湊和成本低等優(yōu)點(diǎn)。目前,自混合干涉現(xiàn)象的研究不斷深入。但對(duì)基于特殊外腔結(jié)構(gòu)激光自混合干涉理論的研究還不夠充分。因此,本文著重研究外腔結(jié)構(gòu)為兩路反饋的激光自混合干涉系統(tǒng)。兩路反饋外腔結(jié)構(gòu)自混合干涉的每路反饋都會(huì)攜帶一個(gè)物體的運(yùn)動(dòng)信息,能夠?qū)崿F(xiàn)對(duì)兩個(gè)待測(cè)目標(biāo)的同時(shí)測(cè)量,且其類似于多重外腔結(jié)構(gòu)自混合干涉。由于目前對(duì)該特殊結(jié)構(gòu)的自混合干涉模型只是進(jìn)行了理論分析'與實(shí)驗(yàn)觀察,還沒(méi)有對(duì)自混合干涉信號(hào)處理的方法進(jìn)行充分的研究。因此,文中通過(guò)對(duì)兩路反饋外腔結(jié)構(gòu)自混合干涉模型的分析,在弱反饋水平下對(duì)自混合干涉信號(hào)的處理方法進(jìn)行了深入的研究。首先利用希爾伯特變換(Hilbert)原理對(duì)兩路反饋?zhàn)曰旌细缮嫘盘?hào)的相位進(jìn)行重構(gòu);然后對(duì)重構(gòu)的信號(hào)相位做FFT變換得到信號(hào)相位的頻譜,再通過(guò)濾波分別得到兩路信號(hào)頻譜;最后再對(duì)兩路信號(hào)頻譜做IFFT變換恢復(fù)出兩路信號(hào)時(shí)域的位移波形。同時(shí)為了減少自混合干涉信號(hào)中噪聲的干擾,提高位移測(cè)量的精度,本文提出了一種基于小波軟閡值和集合經(jīng)驗(yàn)?zāi)B(tài)分解(EEMD)相結(jié)合的信號(hào)預(yù)處理方法,通過(guò)模擬仿真分析及對(duì)實(shí)驗(yàn)采集信號(hào)的去噪處理,驗(yàn)證了該方法的有效性和適用性。另外,針對(duì)外腔結(jié)構(gòu)為單路反饋和兩路反饋的激光自混合干涉系統(tǒng)進(jìn)行了相應(yīng)實(shí)驗(yàn)平臺(tái)的設(shè)計(jì)。主要對(duì)DS102、PZT的使用及信號(hào)的采集方法做了簡(jiǎn)要介紹,對(duì)在實(shí)驗(yàn)過(guò)程中出現(xiàn)的問(wèn)題進(jìn)行簡(jiǎn)單說(shuō)明,并提出相應(yīng)的解決方法。
[Abstract]:The light feedback self mixing interference effect (OFSMI) means that the output light of a laser is reflected or scattered by an external object, and a partial light is fed back into the resonator of the laser and is mixed with the cavity light, resulting in a change in the output power and frequency of the laser and the formation of a self mixing interference effect. It is different from the traditional interference in theory, and the characteristics of the two are also different. The optical feedback self mixing interferometry has the advantages of simple structure, easy alignment, compact optical path and low cost. At present, the study of self mixing interference is going deep. The study is not sufficient. Therefore, this paper focuses on the laser self mixing interference system with two feedback in the outer cavity structure. The feedback of the two channel feedback external cavity structure self mixing interference will carry the motion information of an object, and can realize the simultaneous measurement of two targets to be measured, and it is similar to the multiple external cavity structure self mixing interference. Because of the theoretical analysis and experimental observation of the self mixing interference model of the special structure, there is no sufficient research on the method of self mixing interference signal processing. Therefore, the self mixing interference signal is processed at the weak feedback level by the analysis of the self mixing interference model of the two feedback external cavity structure. The method is studied in depth. First, the phase of two feedback self mixing interference signals is reconstructed by using the Hilbert transform (Hilbert) principle. Then the phase spectrum of the signal phase is obtained by FFT transformation of the reconstructed signal phase, and then the two channel signal frequency spectrum is obtained by filtering. Finally, the two channel signal spectrum is regenerated by IFFT transform. In order to reduce the interference of the noise in the interference signal of the self mixing interference signal and improve the precision of the displacement measurement, a signal preprocessing method based on the combination of the wavelet soft threshold and the collective empirical mode decomposition (EEMD) is proposed, and the simulation analysis and the denoising processing of the experimental acquisition signal are performed. The validity and applicability of the method are proved. In addition, the design of the corresponding experimental platform is designed for the laser self mixing interference system with single channel feedback and two way feedback. The use of DS102, PZT and the method of signal acquisition are briefly introduced, and the problems in the experimental course are briefly explained and the phase is put forward. The solution should be solved.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN24;TN911.7

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