本文選題：激光光斑 + 能量中心　； 參考：《中北大學》2015年碩士論文

【摘要】：激光器依靠其內(nèi)部的規(guī)律性把原子在軸向由受激輻射發(fā)出特定頻率的光子不斷放大和振蕩，使其能量在光譜上強烈地集中起來，并以一定的方向發(fā)射出去，形成具有集中性強、亮度高的激光束，使的激光具有很好的方向性和單色性。因此使其在空間坐標的定位與測量的應用中具有獨特的優(yōu)越性。當今，激光技術在國防建設領域、工業(yè)和醫(yī)療以及生活等多個領域的方方面面都有著廣泛的應用。而在用激光進行空間定位時，特別是在空間位移、角位移以及校瞄測試等激光技術應用中，，其最主要的任務是對激光器所發(fā)射的激光束到達目標位置時光斑能量中心位置的精確定位。在本文中，我們主要探討激光光斑能量中心位置的精確定位。在探討過程中我們主要分析與研究激光光斑能量密度的分布情況，且討論激光束在不同方向入射時激光光斑能量分布的變化情況。并最后通過實驗測試加以輔證。 本文主要對激光光斑能量及中心位置的分布進行了理論分析與實驗測試，即在激光束垂直入射時，對激光光斑能量密度的分布情況進行理論分析，并通過光電探測器對光斑能量進行采樣測量來獲得實驗驗證；在激光束斜入射時，通過理論分析激光束在二維PSD光電探測器上產(chǎn)生各級衍射環(huán)的能量的分布情況，并且對激光光斑的能量中心位置進行計算；通過固定有二維PSD光電探測器的轉盤，使激光束以不同的入射角入射到二維PSD光電探測器上。最后通過激光束的入射角度與光斑能量中心位置分布的擬合曲線獲得在不同入射角下，能量中心偏移的變化規(guī)律及激光的光斑能量中心位置的偏移量。從而為項目研究的方案設計提供實驗依據(jù)。
[Abstract]:Depending on its internal regularity, the laser constantly amplifies and oscillates the photon with a specific frequency emitted by the excited radiation in the axial direction, so that its energy is intensely concentrated in the spectrum and emitted in a certain direction, forming a strong centralization. High brightness of the laser beam, so that the laser has a good directionality and monochromatic. Therefore, it has unique advantages in the application of spatial coordinate positioning and measurement. Nowadays, laser technology is widely used in many fields, such as national defense construction, industry, medical treatment and daily life. And when using laser to locate in space, especially in the application of laser technology, such as spatial displacement, angular displacement and calibration and aiming test, The most important task is to accurately locate the energy center of the laser spot when the laser beam reaches the target position. In this paper, we mainly discuss the accurate location of the energy center of laser spot. In the process of discussion, we mainly analyze and study the distribution of laser spot energy density, and discuss the change of laser spot energy distribution when laser beam is incident in different directions. And finally through the experimental test to support the evidence. In this paper, the distribution of laser spot energy and its central position is analyzed theoretically and experimentally, that is, the distribution of laser spot energy density is theoretically analyzed when the laser beam is incident vertically. The experimental verification is obtained by sampling and measuring the spot energy by the photodetector, and the energy distribution of all diffraction rings produced by the laser beam on the two-dimensional PSD photodetector is analyzed by theoretical analysis when the laser beam is oblique incident. The position of the energy center of laser spot is calculated, and the laser beam is incident to the two-dimensional PSD photodetector at different incident angles by fixing the rotating disk of two-dimensional PSD photodetector. Finally, by fitting the curve between the incident angle of the laser beam and the distribution of the energy center of the spot, the law of the shift of the energy center at different incident angles and the offset of the energy center of the laser spot are obtained. So as to provide experimental basis for the project research project design.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN249

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