Phase determination in holographic Moiré in presence of nonsinusoidal waveforms and random noise

This paper proposes a subspace parameter estimation method which besides allowing for accommodating multiple PZTs in an optical interferometer permits for extracting in real time values of phase shifts between data frames at each pixel point. The technique enables to freely choose values of phase shifts between 0 and π. A generalized phase measurement algorithm allows for computing multiple phase information present in the interferometer. The method facilitates the use of spherical beams, addresses errors arising from the miscalibration of the phase shifting devices, and is capable of handling nonsinusoidal waveforms in an effective manner. Numerical simulations demonstrate that phase distributions can be measured with high accuracy even in the presence of noise.     

提高客观测色精度的有效方法──相关综合匹配法

本文讨论一种测量颜色的相关综合匹配法。它根据各色散元件的光谱透过率和光电探测器的光谱灵敏度，选择最佳的综合权因子，以匹配颜色函数，从而改善测色精度和速度．     

光纤近场测量中自动聚焦系统的研究

在用近场法测量光纤几何尺寸时,关键在于调节光学系统,获得优质的光纤近场图象.而要使这样的测量系统实现自动化,关键在于寻找图象是否清晰的适当判据,继而构成自动调节与控制的闭环反馈系统.本文介绍了利用信息熵判别函数,可以较好地判断图象质量,从而实现了自动调焦和自动测量.     

准直物镜对杂光测量结果的影响

论述准直物镜对杂光系数测量的影响，并给出实验例证，提出在高精度杂光测量中应扣除准直物镜杂光测量结果的影响。     

利用光纤和F-P标准具测量激光的波长和谱线宽度

本文提出了用光纤传输激光进行Ｆ－Ｐ标准具实验的方法，测量了激光的波长和谱线宽度．     

1.6Cell光阴极微波电子枪冷测及初步高功率实验研究

介绍了清华大学加速器实验室BNL/KEK/SHI型1.6cell微波枪调谐以及老练的初步结果. 调谐过程中, 测量了耦合孔尺寸与外部品质因数之间的关系; 给出了0模和π模的频率、单腔频率以及场分布. 目前, 该微波电子枪正在进行高功率微波老练, 给出了该枪初步的微波老练的情况及测量结果.     

基于龙基光栅塔尔博特效应的长焦距测量

提出通过对龙基光栅的塔尔博特效应所产生的莫尔条纹角度的计量来测量长焦距的方法。并在此基础上推导了长焦距的计算公式，分析了这种方法的测量误差。这种长焦距测量方法具有实时测量、精度高的特点。     

A TRANSPLANTABLE COMPENSATION SCHEME FOR THE EFFECT OF THE RADIANCE FROM THE INTERIOR OF A CAMERA ON THE ACCURACY OF TEMPERATURE MEASUREMENT

Radiance coming from the interior of an uncooled infrared camera has a significant effect on the measured value of the temperature of the object. This paper presents a three-phase compensation scheme for coping with this effect. The first phase acquires the calibration data and forms the calibration function by least square fitting. Likewise, the second phase obtains the compensation data and builds the compensation function by fitting. With the aid of these functions, the third phase determines the temperature of the object in concern from any given ambient temperature. It is known that acquiring the compensation data of a camera is very time-consuming. For the purpose of getting the compensation data at a reasonable time cost, we propose a transplantable scheme. The idea of this scheme is to calculate the ratio between the central pixel’s responsivity of the child camera to the radiance from the interior and that of the mother camera, followed by determining the compensation data of the child camera using this ratio and the compensation data of the mother camera Experimental results show that either of the child camera and the mother camera can measure the temperature of the object with an error of no more than 2°C.     

Improved method for loss measurements in planar waveguides

A method employing an isosceles prism and a right-angle one is developed for loss measurement in planar waveguides. During the measuring process, the isosceles prism is fixed and the right-angle prism fixed on the waveguide slides by following the waveguide. Only by adjusting the gap thickness we can realize the loss measurement in planar waveguides. The method is demonstrated with an Ag/Na ion-exchanged waveguide fabricated on BK7 glass from AgNO₃ melt diluted with NaNO₃ (mass ratio 1:9), with the condition of 4 h and . The experimental results show that the method has the advantages on convenient operation, accurate results and no required end polishing.