大景深多重全息术及其应用

提出并实现服用一般Ｈｅ－Ｎｅ激光器记录的大景攀重全息术，这种技术是根据光源时间相干性的特点，在参考光上作光路补偿来扩大景深，并用旋转光楔调制两平面参考波，记录大景深物场的多重全息图，这是一种重像数可以选择的大景深多重全息术，文中给出理论分析和实验结果，理论分析与实验结果是吻合的，文中还提出了用旋转光楔实现多路多参考光编码记录的多通道大景深全息干涉计量术，这种技术可用于研究大景深物场的时间序列动态过     

用脉冲激光全息术测量喷雾场中粒子的分布和运动速度

本文叙述了用脉冲激光全息术测量喷雾场中粒子的分布和运动速度的原理，阐明了同轴全息和离轴全息在测量雾场的应用范围，重点讨论了离轴全息。测量光学系统是４Ｆ系统，它可以测量粒子浓度大的雾场中大于５μｍ的粒子分布和运动速度。在平行光场区段，可进行不同装置、不同景深的喷雾研究，使每个粒子具有相同的放大倍数，它给再现、数据处理、粒子大小的标定都有很大的好处。文中还分析了在底片上形成干涉的各种情况；粒子直径ｄ，远场数Ｎ和从底片到粒子的距离Ｚ的关系。给出脉冲间隔为５μｓ；１０μｓ粗度为±０．１μｓ时不同直径粒子的分布和运动速度在电视屏幕上显示出来的照片。在上述实验结果的基础上讨论了粒子的识别，噪音的消除等问题。     

三维温度场的激光全息与干涉层析

本文论述了多方向干涉层析再现三维温度场的原理,提出了多方向象面全息干涉法,并利用这种方法测量了三维温度场分布;进一步提出了一种更有实用价值的多方向法布里-珀罗干涉法,它具有实时性,能用于真实瞬态流场的测量.     

Optical methods for precision measurements

Contactless measuring techniques are becoming increasingly important for industrial applications. The use of a laser, solid-state detector arrays and powerful small computers leads to a very efficient fringe analysis in holography as well as in Moiré and speckle techniques. Due to the computer analysis, much more information can be extracted from interferograms, leading to higher sensitivities and accuracies. The application of different fringe analysis procedures is discussed, together with some potentials of the application of interferometry, holography, and speckle and Moiré techniques.     

Single Longitudinal－mode with Pulsewidth Adjustable Ability Double Frequency Nd：YAG Laser System

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Four-pulse interferometric recordings of transient events by pulsed TV holography

With traditional double-pulsed holographic interferometry or pulsed TV holography, the experiment usually has to be repeated to allow the recording of a time sequence of interferograms of the event. With the proposed technique a sequence of four interferograms of a solitary transient event is measured. A twin oscillator, injection-seeded, pulsed Nd:YAG laser is incorporated into a pulsed TV holography set-up. With orthogonal polarisation and double pulsing of each of the two channels of the laser, four pulses are recorded on two separate CCD-frames. Four interferograms of a laser-impacted plate obtained from the same experiment, show how the bending waves develop and propagate in the plate.     

实现高重复率双脉冲激光器的新方法

本文分析了双脉冲运转的种子注入激光器及其存在的问题,在此基础上首次提出了用相位共轭主振荡器功率放大(MOPA)激光器组成高重复率n脉冲运转激光器系统的新方法,获得了重复率可达几千Hz且高相干度的脉冲输出,该系统具有相当好的性能,可望替代种子注入激光器而成为动态全息检测领域的一种新光源.     

Fixed Q pulsed holographic interferometry

Continuous wave laser time-averaged type holographic interferometry has long been used for the analysis of structural vibrations. The exposure time is usually much larger than the vibration period. The brightest interference fringe corresponds with the nodal region, i.e. that portion of the surface that remains stationary during exposure. The application of the technique is, however, like all continuous wave laser holography, limited to structures that can be observed in a vibration free environment.The output of a ruby laser oscillator in use at Marchwood Engineering Laboratories (MEL) consists of a random series of spikes contained in an envelope of about 800 μ. The coherence length of the output is greater than 1 m. Use of this output allows the production of time-averaged holograms in unstable environments. Due to the random nature of the output, the fringes are not readily quantifiable but show the characteristic bright zero-order fringe of continuous wave time-averaged holography.     

Holography and electronic speckle pattern interferometry in geophysics

Geophysical applications of holography and ESPI are reviewed. First, laboratory experiments of rock deformation and failure with holographic interferometry and holographic in situ stressmeters are briefly summarized. Then, holographic measurements of tunnel deformations made in Japan are described. The holographic recording system, consisting of an He---Ne gas laser and associated optical elements, was installed in a tunnel at the Amagase Crustal Movement Observatory, Japan in 1984. Tunnel deformations caused by tidal and tectonic forces have been precisely determined using the ‘real-time’ technique of holographic interferometry. Finally, some attempts to apply ESPI to geophysical measurements are introduced.     

全息相干快门超高速摄影初步研究

本文利用全息飞光记录的方法实现了全息相干快门超高速摄影。用CPM染料激光器输出的亚皮秒级超短激光脉冲,记录了光波聚焦的动态过程,同时提出了这种新技术分幅频率的计算方法,文中所述实验的分幅频率为10¹²f/s,达到了目前高速摄影的最高水平。