恒星光干涉仪样机的总控系统

控制系统以SCO公司的UNIX ODT为软件平台,普通PC机为总控计算机,通用8098单 片机系统作为前端机组成一个主从式两级管理系统,与PC机相连的16通道多用户卡通过RS-232与14个前端机通讯,进行实时控制和处理。用C语言编写了该样机的总控软件,前端机的通讯程序和相关控制部件的控制程序。经过调试,实现了对样机的全自动控制。     

六自由度测试系统

本文所描述的测试系统基于激光全息分光技术和激光干涉测长技术,同时测定目标物体六个自由度的偏差。采用激光漂移补偿技术建立了稳定的激光束基准,采用磁光调制技术减小光强不稳定等因素对滚转角测量精度的影响,实现了多自由度较高精度的准直。实验表明,在激光光源距靶标１ｍ时,该系统σ重复性误差：线位移小于４μｍ,角位移小于４″,整个系统结构简单,测量效率高。     

通道间幅度相位不一致对干涉仪测向的影响和解决方法

该文着重分析了通道不一致对干涉仪测向带来的影响,给出了分析结果。利用自动增益控制原理,建立了消除通道不一致对干涉仪测向影响的模型。仿真结果表明,该模型是有效的。该模型也同样适用于其他测向系统。     

关于会聚光路横向剪切干涉仪的几个理论问题探讨

本文探討了会聚光路橫向剪切干涉仪的几个理论问题。它们是光源的临界尺寸,离焦剪切模式,象差干涉图分析及灵敏度等问题。此类问题对干涉仪設计是十分重要的。     

What can we do with a linear optical logic gate?

In an earlier paper [H.J. Caulfield, J. Westphal, The logic of optics and the optics of logic, Information Sciences 162 (2004) 21-33], we considered a simple interferometer (initially conceived as Mach-Zehnder) with two uniform intensity mutually coherent inputs. By encoding those inputs with phases 0 and π representing Boolean 0 and 1 and identifying the detected values of the outputs as logical Boolean values, we found that the outputs could be identified as the Boolean operations XOR and COINC (sometimes called XNOR). Here, we show that this seemingly simple interferometer can perform many additional functions if we use phases to interpret its outputs. But the XOR/COINC are the only non-trivial logic gate we can get no matter how we cascade Mach-Zehnder interferometers. We also generalize those operations upwards (to three or four arguments). We show that the three argument interferometer or four-argument interferometer cannot produce a Fredkin gate or its variation.     

An evaluation of surface asperity profile changes in truncation processes using optical interferometric microscope

The truncation process as running-in wear was applied to evaluate surface asperity changes as removal at the top of its asperity profile. The measurement was done using an optical interferometric microscope. Whole surface profile was measured by the microscope supported by the stitching technique. The specimen was relocated on the microscope utilizing Hirth coupling as a hardware technique. Data obtained from a truncated specimen were precisely relocated to the original untruncated specimen by computer software in three dimensions. Then the profile change was obtained by deducting truncated data from the original data. The profile change was calculated as removed volume. The volume changes are plotted against a sliding length. As the software relocation technique needs the unchanged profile of a valley part, the evaluation is limited to where the truncation height is higher than −1.28 sigma (the standard deviation of untruncated original profile height). The present research can detect very little volume change that cannot be measured by other conventional methods, such as the gravimetric method. The advantages of the present method are as follows. It is possible to compare the truncated surface profile with the original untruncated surface profile in three dimensions. Thus, the inclination of the truncation surface can be evaluated and any other local changes can also be assessed. From this information the profiles of truncated surfaces will be linked to functions, and new parameters for truncation profile will be presented.     

加工中心切圆的一种异常现象分析

文章介绍了用雷尼绍激光干涉仪对某立式加工中心所切圆进行检验，并对检验图形上坐标反向点处出现的突跳异常进行了分析，结果表明反向点处的突跳异常是由于电动机惯量与移动件移动惯量不匹配所致。     

利用双波长测量金属膜的厚度

本文为测量金属膜的厚度提供了一种新的用双波长的测量方法。该方法测量简便，精度高，同时也适用于透明介质膜的厚度测量，测量范围从几十个波长至１ｃｍ。     

Refractive index determination in fuel cells using high-resolution laser heterodyne interferometer

In this paper, we present an interferometry method for refractive index determination in membranes of fuel cells. This technique is based on the use of an improved laser heterodyne interferometer. The photocurrents of the avalanche photodiodes, resulting from reflected beams of the optical head, are led to the signal conditioner and digital signal processing sections. The optical path difference between the target and reference paths is fixed, and as a result, the phase shift is calculated in terms of the refractive index shift. In addition, nonlinearity of this system is analyzed and modeled with different neural networks and adaptive filter algorithms. For neural networks, the radial basis function (RBF), the multi-layer perceptron (MLP), and the stacked generalization method are simulated. In adaptive filter algorithms, the least mean square (LMS), the normalized least mean square (NLMS), the recursive least squares (RLS), and the affine projection algorithm (APA) are applied. The simulation results indicate that the RLS method is faster and contains minimum mean square error (MSE) compared to the other approaches. Also, comparison between two main approaches shows that the nonlinearity of refractive index determination can be effectively modeled with adaptive filter algorithms.     

一个干涉图法波面位相自动探测

用Ｈｅ－Ｎｅ激光器作光源、ＣＣＤ摄像机－微机系统作探测器，应用一个干涉图法在泰曼干涉仪上实现了自动计算干涉图，不但再现了二维等高线图，而且获得了三维波面面形，作为实例，测试了玻璃平板的不平行度。