本文選題：激光自混合效應(yīng) + 激光調(diào)制��； 參考：《中國(guó)科學(xué)技術(shù)大學(xué)》2016年博士論文

【摘要】：激光自混合干涉技術(shù)具有結(jié)構(gòu)簡(jiǎn)單、造價(jià)低廉及非接觸測(cè)量等顯著優(yōu)點(diǎn)。隨著激光自混合效應(yīng)研究的深入和先進(jìn)制造技術(shù)的提升,多物理參數(shù)的同步高分辨率測(cè)量,已經(jīng)成為激光自混合技術(shù)和先進(jìn)光學(xué)檢測(cè)領(lǐng)域發(fā)展的重要需求之一。本文在研究多重光反饋、三角波激光調(diào)制的基礎(chǔ)上,搭建了基于激光自混合效應(yīng)的高精度光纖式的振動(dòng)和角度同步測(cè)量系統(tǒng)、速度和位移的同步測(cè)量系統(tǒng)以及運(yùn)動(dòng)速度的二維信息同步獲取系統(tǒng),并進(jìn)行了相關(guān)實(shí)驗(yàn),主要研究工作如下1.基于激光自混合效應(yīng)的三鏡腔理論模型,系統(tǒng)地分析了弱反饋條件下,激光器參數(shù)對(duì)激光自混合信號(hào)的影響,結(jié)果表明,在激光器諧振腔1-20mm長(zhǎng)度和1.526-1.933折射率范圍內(nèi),減小諧振腔的長(zhǎng)度和有效折射率,有助于增強(qiáng)激光自混合效應(yīng)。2.提出了一種基于激光自混合效應(yīng)的顆粒物粒徑反演的理論方法,結(jié)合隨機(jī)信號(hào)理論和計(jì)算機(jī)仿真,模擬了顆粒物后向散射光引起的激光自混合信號(hào)變化特征,系統(tǒng)地分析了顆粒物粒徑對(duì)激光自混合信號(hào)的影響,對(duì)仿真信號(hào)的功率譜密度進(jìn)行洛倫茲擬合,得到粒徑在0.5-3μmm范圍內(nèi)氣溶膠粒子的反演粒徑,誤差小于11%。3.闡述了激光自混合效應(yīng)中的雙重光反饋效應(yīng),通過(guò)模擬仿真和實(shí)驗(yàn)驗(yàn)證分析了雙重光反饋效應(yīng)的來(lái)源以及影響因素。理論和實(shí)驗(yàn)結(jié)果表明,激光自混合技術(shù)中的雙重光反饋效應(yīng)是由激光器的出射激光在外腔中兩次反射引起的,兩次反射光的有效強(qiáng)度比值和有效相位差值是雙重光反饋效應(yīng)程度的重要影響因素。4.搭建了基于激光自混合效應(yīng)的角度和振幅同步測(cè)量的單通道光纖系統(tǒng),在0.990°-1.029°的角度范圍和0-3000mVpp的振動(dòng)范圍,角度和振動(dòng)測(cè)量誤差分別優(yōu)于12.1%和1%,測(cè)量精度可達(dá)387.5nm。5.采用三角波調(diào)制方案,搭建了基于激光自混合效應(yīng)的速度和位移同步測(cè)量的單通道光纖系統(tǒng),分析了三角波的幅度、頻率和不對(duì)稱度對(duì)實(shí)驗(yàn)信號(hào)的影響,選擇合適的調(diào)制信號(hào)。在0.016-0.47m/s的速度范圍和1-23mmm的位移范圍,速度和位移誤差分別優(yōu)于5.3和9.8%。6.搭建了基于激光自混合技術(shù)的雙通道光纖測(cè)速系統(tǒng),實(shí)現(xiàn)了兩個(gè)通道速度的同步測(cè)量,入射角為45°時(shí),兩個(gè)通道的測(cè)速誤差分別是7.3%和8.6%。通過(guò)入射光對(duì)稱和垂直的測(cè)速方法,能夠?qū)y(cè)量誤差分別減小為5.2%和6.8%。
[Abstract]:Laser self-mixing interferometry has the advantages of simple structure, low cost and non-contact measurement. With the development of laser self-mixing effect and advanced manufacturing technology, synchronous high-resolution measurement of multi-physical parameters has become one of the important requirements in the field of laser self-mixing technology and advanced optical detection. Based on the study of multiplex optical feedback and triangle-wave laser modulation, a high-precision optical fiber vibration and angle synchronous measurement system based on laser self-mixing effect is built in this paper. The synchronous measurement system of velocity and displacement and the two dimensional information acquisition system of motion velocity are used in this paper. The relevant experiments are carried out. The main research work is as follows: 1. Based on the three-mirror cavity theory model of laser self-mixing effect, the influence of laser parameters on laser self-mixing signal under weak feedback condition is systematically analyzed. The results show that in the range of 1-20mm length and 1.526-1.933 refraction index of laser resonator, Reducing the length and effective refractive index of the resonator is helpful to enhance the laser self-mixing effect. A theoretical method of particle size inversion based on laser self-mixing effect is proposed. Combining with random signal theory and computer simulation, the variation characteristics of laser self-mixing signal caused by backscattering light of particles are simulated. The influence of particle size on laser self-mixing signal is analyzed systematically. The power spectral density of simulated signal is fitted by Lorentz, and the inverse particle size of aerosol is obtained in the range of 0.5-3 渭 mm, the error is less than 11.3. The double optical feedback effect in laser self-mixing effect is described. The source and influencing factors of double optical feedback effect are analyzed by simulation and experiment. The theoretical and experimental results show that the double optical feedback effect in the laser self-mixing technique is caused by the two reflections in the external cavity of the laser output laser. The ratio of effective intensity and effective phase difference of two times reflected light is an important factor influencing the degree of double optical feedback effect. A single channel optical fiber system based on the angle and amplitude synchronization measurement of laser self-mixing effect is built. In the angle range of 0.990 擄-1.029 擄and the vibration range of 0-3000mVpp, the error of angle and vibration measurement is better than 12.1% and 1.00% respectively, and the measurement accuracy is 387.5 nm.5. A single-channel optical fiber system based on the synchronous measurement of the velocity and displacement of laser self-mixing effect is built by using the triangle-wave modulation scheme. The effects of the amplitude frequency and asymmetry of the triangular wave on the experimental signal are analyzed and the suitable modulation signal is selected. In the range of velocity of 0.016-0.47m/s and displacement of 1-23mmm, the error of velocity and displacement is better than 5.3 and 9.8.6respectively. A two-channel optical fiber velocimetry system based on laser self-mixing technology is set up, and the synchronous measurement of two channel velocities is realized. When the incident angle is 45 擄, the error of velocity measurement of the two channels is 7.3% and 8.6%, respectively. The measurement error can be reduced to 5.2% and 6.8% respectively by symmetrical and vertical incident light velocimetry.
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN24

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