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以激光作为准直基准,研制了基于位置敏感探测器(PSD)的长跨度孔系同轴度误差测量系统。多功能测头在孔系内通过自定心机构确定各被测截面,测头前端的PSD检测激光光斑位置以确定各孔截面中心坐标,并进而评定出孔系同轴度误差。推导出激光自准直数学模型,根据该模型由四自由度工作台调整激光器位置,实现了激光自准直。使用本测量系统完成了激光自准直实验和孔系同轴度误差测量实验。实验结果表明:经准直后激光束与工件两端孔中心连线之间的偏差在±0.032 mm以内,与三坐标测量机相比,本系统同轴度误差测量的相对误差为8%,具备了较高的准直精度和同轴度误差测量精度。 相似文献
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空间测量定位系统测角不确定度分析及检定 总被引:1,自引:0,他引:1
空间测量定位系统是一种基于旋转激光平面进行角度交汇定位的新型网络式测量系统。为了对该系统进行严格的量值溯源,建立了测角模型,对系统单站测角不确定度进行了分析与验证。首先根据系统测量原理,推导出单站水平角和垂直角计算公式。然后在系统误差传递特性基础上,分析了测角模型中误差项的来源及影响,并对单站测角不确定度进行了估计。最后采用DFT-720A型号手动分度台作为角度基准,利用多面棱体和平行光管调整同轴度,对系统单站的水平测角不确定度进行了检定,分析了实验调整误差对检定结果的影响,实验结果表明该系统水平测角不确定度为2.4″(置信概率为99.73%),是实现高精密坐标测量的基础。 相似文献
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设计了一种可测量小范围温度扰动的全光纤M ach-Zehnder干涉测量系统。简单介绍了全光纤M ach-Zehnder干涉仪的基本结构和工作原理,并推导了干涉条纹移动距离与测量臂长度变化之间的关系式;在理论分析的基础上,搭建了一全光纤M ach-Zehnder干涉仪系统,通过在有标识刻线的接收屏上直接观察测量干涉条纹的移动距离来确定测量臂光纤的温度变化,最终,确定了测量臂光纤加热温度和干涉条纹移动距离之间的关系;通过实验结果分析可知,该干涉系统可实现小范围温度扰动的准确测量,测量精度可达到℃/18。 相似文献
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随着空间及卫星定位技术的飞速发展,各种空间定位技术及应用也愈来愈多.本文简要介绍了甚长基线干涉测量(VLBI)技术、激光测月(LLR)技术、卫星激光测距(SLR)技术、卫星雷达测高技术、多普勒定轨和无线电定位系统(DORIS)、精密测距及其变率测量系统(PRARE),以及合成孔径雷达干涉测量(InSAR)等空间定位测量技术,重点阐述了GPS新技术及应用. 相似文献
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大型工件在制造过程中,面临着各式各样的检测任务,大尺寸测量技术成为现代测试技术的一个越来越重要的分支,为提高大尺寸工件静态几何量的检测精度,将激光干涉仪与传统测长机相结合,提出两种基于激光干涉技术的大尺寸高精度的绝对测量方法.通过对两种测量方法的不确定度理论分析和实验比对,验证方法的准确度和可行性.一方面激光干涉仪传统的动态测量转换为高精度的静态量检测,拓展了激光干涉仪的应用领域,同时弥补了测长机在绝对测量能力方面的不足,提高了测长机的测量精度和检测效率. 相似文献
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Head–disk spacing of hard disk drives was measured based on Michelson interferometry using white light illumination. This
method utilizes the phase comparison of two interference fringe patterns formed respectively on the inner surface of a glass
disk and the air bearing surface of a slider through the glass disk. To suppress interference noise and to further enhance
measurement accuracy, low coherent white light was adopted as an illuminating source to replace high coherent laser. A high
sensitive CCD digital camera was used to compensate for the attenuation of the brightness and contrast of the interference
fringe pattern in the white light-based Michelson interferometer. The captured images and the measured results indicate that
the application of white light illumination effectively improves the interference fringe pattern, and the measurement error
of extracting the ridgeline can be consequently reduced five times in comparison with a laser. Spacing resolution (=λ/2w) was enhanced to 0.68 nm/pixel in our experiment, closely approaching the extreme spacing resolution (at the largest fringe
interval w
max) of 0.64 nm/pixel. Indirect and direct methods for determining fringe interval were proposed, and the latter provides higher
accuracy. Head–disk spacing was measured at different spacing resolutions of 2.61 and 0.68 nm/pixel to clarify the effect
of fringe interval on measurement accuracy. The results show that tested spacing at larger fringe interval achieves not only
better agreement with the calculated example, but also better deviation tolerance characteristics. Based on the advantages,
measurement of 10 nm spacing was realized with high accuracy and good repeatability. 相似文献
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Hart M.R. Conant R.A. Lau K.Y. Muller R.S. 《Journal of microelectromechanical systems》2000,9(4):409-418
We describe a computer-controlled stroboscopic phase-shifting interferometer system for measuring out-of-plane motions and deformations of MEMS structures with nanometer accuracy. To aid rapid device characterization, our system incorporates (1) an imaging interferometer that records motion at many points simultaneously without point-by-point scanning, (2) an integrated computer-control and data-acquisition unit to automate measurement, and (3) an analysis package that generates sequences of time-resolved surface-height maps from the captured data. The system can generate a detailed picture of microstructure dynamics in minutes. A pulsed laser diode serves as the stroboscopic light source permitting measurement of large-amplitude motion (tens of micrometers out-of-plane) at kilohertz frequencies. The high out-of-plane sensitivity of the method makes it particularly suitable for characterizing actuated micro-optical elements for which even nanometer-scale deformations can produce substantial performance degradation. We illustrate the capabilities of the system with a study of the dynamic behavior of a polysilicon surface-micromachined scanning mirror that was fabricated in the MCNC MUMPS foundry process 相似文献
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设计并搭建了一种光谱共焦位移测量系统。利用高斯拟合算法拟合每组实验数据,获取光谱响应曲线峰值对应的光波长值,采用Levenberg-Marquardt算法优化求解高斯函数的参数向量;利用双频激光干涉仪对系统进行标定,获得光波长和反射镜位移之间的对应关系;对整个系统作精度分析。实验结果表明:高斯拟合算法适合作为该位移测量系统的数据处理方法;用双频激光干涉仪对系统标定的方法能够准确定位反射镜的位置。该设计系统的测量范围为20 mm,测量精度为10μm,能够满足一定精度的测量要求。 相似文献
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Verification of the indoor GPS system, by comparison with calibrated coordinates and by angular reference 总被引:1,自引:0,他引:1
J. E. Muelaner Z. Wang O. Martin J. Jamshidi P. G. Maropoulos 《Journal of Intelligent Manufacturing》2012,23(6):2323-2331
This paper details work carried out to verify the dimensional measurement performance of the Indoor GPS (iGPS) system; a network of Rotary-Laser Automatic Theodolites (R-LATs). Initially tests were carried out to determine the angular uncertainties on an individual R-LAT transmitter-receiver pair. A method is presented of determining the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An experimental procedure was developed to compare three dimensional coordinate measurements with calibrated reference points. The reference standard used to calibrate these reference points was a fringe counting interferometer with the multilateration technique employed to establish three dimensional coordinates. This is an extension of the established technique of comparing measured lengths with calibrated lengths. The method was found to be practical and able to establish that the expanded uncertainty of the basic iGPS system was approximately 1?mm at a 95% confidence level. Further tests carried out on a highly optimized version of the iGPS system have shown that the coordinate uncertainty can be reduced to 0.25?mm at a 95% confidence level. 相似文献
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提出了一种新的压力传感器的设计,该传感器基于Fabry-Perot腔干涉和波长解调理论测量压力.设计用MEMS技术以及普通的光通讯接插件制作出工艺简单,分辨率高的光纤MEMS压力传感器.阐述了传感器的工作原理,分析了硅膜的厚度对传感器性能的影响以及FP腔的长度对反射光信号的影响.系统采用可调谐激光器进行信号访问,利用反射谱的相位变化完成信号解调.理论分析和模拟计算验证了传感器加工制作方案的可行性. 相似文献
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This paper describes the terrain height measurement capability of synthetic aperture radar with an interferometer assuming the radar operates on a satellite. The interferometer phase measurement uncertainty due to additive thermal noise and multiplicative speckle noise, which determine the upper limit of the height measurement accuracies of this radar system, has been obtained by numerical simulation. The height measurement accuracies attainable on a relatively flat terrain areas are of roughly the same order as range resolution when C- or X- band radar is operated at an altitude of 300 km. 相似文献
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Qiaoyun Wang Author VitaeJianwei WangAuthor Vitae Liang LiAuthor VitaeQingxu YuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,153(1):214-218
An all-optical photoacoustic spectrometer based on the diaphragm-based extrinsic Fabry-Perot interferometer (EFPI) fiber acoustic sensor for trace gas detection at atmospheric pressure and room temperature is first developed. The diaphragm-based EFPI fiber acoustic sensor is used to replace the conventional acoustic sensor in this system. Tunable erbium-doped fiber ring laser (TEDFRL) with an erbium-doped fiber amplifier (EDFA) is used as the excitation light source for the generation of the photoacoustic (PA) signal. A first longitudinal resonant PA cell with double absorption optical path is used to improve the sensitivity of the system. The advantages of all-optical photoacoustic spectrometer are immunity to electromagnetic interference, safely in flammable and explosive situations, and long distance sensing. This system is developed for the continuous and real-time measurement of acetylene gas at room temperature and atmospheric pressure. With the wavelength modulation and lock-in harmonic detection method, the minimum detectable limit of 1.56 parts-per-billion (ppb) volume acetylene (signal-to-noise ratio, SNR = 1) at the 1530.37 nm transition line was achieved. 相似文献