【摘 要】
：
Digital speckle pattern interferometry (DSPI) is a high-precision deformation measurement technique for planar objects. However, for curved objects, the three-dimensional (3D) shape information is needed in order to obtain correct deformation measurement
【机 构】
：
DepartmentofInstrument,SchoolofElectronicInformationandElectricalEngineering,ShanghaiJiaoTongUnivers
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
Digital speckle pattern interferometry (DSPI) is a high-precision deformation measurement technique for planar objects. However, for curved objects, the three-dimensional (3D) shape information is needed in order to obtain correct deformation measurement in DSPI. Thus, combined shape and deformation measurement techniques of DSPI have been proposed. However, the current techniques are either complex in setup or complicated in operation. Furthermore, the operations of some techniques are too slow for real-time measurement. In this work, we propose a DSPI technique for both 3D shape and out-of-plane deformation measurement. Compared with current techniques, the proposed technique is simple in both setup and operation and is capable of fast deformation measurement. Theoretical analysis and experiments are performed. For a cylinder surface with an arch height of 9 mm, the error of out-of-plane deformation measurement is less than 0.15 μm. The effectiveness of the proposed scheme is verified.
其他文献
A-plane GaN films are deposited on (302) \gamma-LiAlO2 substrates by metalorganic chemical vapor deposition (MOCVD). The X-ray diffraction (XRD) results indicate that the in-plane orientation relationship between GaN and LAO substrates is [010]LAO//[0001
采用高精度纳米位移台作为被测振动体目标,研究基于超小自聚焦(GRIN)光纤探头的扫频光学相干层析成像(SS-OCT)测振技术。解析基于超小GRIN光纤探头的集成化SS-OCT工作性能,理论上该系统可测振动的最大峰峰值达12.5 mm,最大频率达25 kHz。搭建相应的测振实验系统,并进行微小振动的测试及分析。结果显示,设置纳米位移台振动峰峰值范围1 nm~5 μm、频率范围1~200 Hz,该集成化SS-OCT测振系统可测出频率1 Hz、峰峰值6 nm及以上的微小振动。对振幅为25 nm、频率为10Hz的
使宽度约为5ps的锁模染料光脉冲与锁模Ar 光脉冲柱KDP晶片内互相关,可以确定514.5nm与488.0nm Ar 光脉冲宽度约为210ps,型状为高斯型。
今年2月在纽约召开的美帝物理协会年会上，报告和展览了去年所取得的一些成就。会议谈到了金属蒸汽激光器的进展。展品中比较突出的是美帝无线电公司研制的氦-硒激光器，它可以在电磁波谱的可见区产生24条谱线。在一次技术性会议上，布鲁克林工业大学的研究人员报导了一种脉冲铜蒸汽激光器。
A four-level tripod active-Raman-gain scheme is analyzed for obtaining phase-controlled gain, phase shift, and group velocity at room temperature. The scheme can be used to eliminate significant probe field attenuation or distortion which is unavoidable i
稀土上转换发光纳米颗粒（UCNPs）可将近红外光转化为紫外可见光，能有效解决光动力抗菌疗法（PACT）中组织穿透深度小、治疗效率低的问题。综述了基于稀土上转换发光纳米平台的光动力抗菌疗法的研究进展，并对新型联合抗菌平台的开发及其在临床上的应用进行了展望。
在受驱动光学系统中增设内腔多光子吸收元件是抑制腔场噪声的有效手段。为在好腔条件(ｋ《γ∥，γ⊥)下获得低噪声强光场，应选用高吸收非线性元件。若所需场强较弱，在主动腔状态应选用非线性吸收最低的双光子吸收体，在被动腔状态则应让系统工作在无吸收状态。
分析了引起磁光石榴石薄膜光衰减的各种因素,导出了光吸收系数α和光散射系数γ的表达式。采用磁光调制比较法测量了（BiTm）3（FeGa）5O12薄膜的α、γ值。与通常方法相比,这种方法不仅消除了衬底吸收,薄膜-衬底界面反射对测量α值的影响,而且可以将γ与α分离开来,从而使得到的α值比较接近于真值。