共查询到19条相似文献,搜索用时 78 毫秒
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CCD成像在线测量玻璃管外径及壁厚方法的研究 总被引:2,自引:2,他引:0
根据平行光透过玻璃管的折射规律,提出用CCD成像在线测量玻璃管外径壁厚的新方法,并用计算机进行模拟,导出数理模型,最后用设计的实验测量系统证明了该方案的可行性。 相似文献
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项目设计的回旋式自动悬浮超声波探头装置,采用超声波时差法测量地下高压储气井钢管的壁厚,为满足检测分辨率为0.2mm的要求,需要对小至0.075μS的时间差进行高精度测量。方案采用在MSP430单片机控制下的高精度时间间隔测量芯片TDC-GP2实现了前述技术要求。以此为核心开发研制的CNG地下高压储气井专用检测装置设备样机具有体积小、重量轻、成本低、精度高、使用方便的特点,较好地满足了地下储气井现场检修探测的技术要求。 相似文献
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介绍一种激光在线检测玻璃管外径及壁厚的方法,根据折射原理建立平行光扫描玻璃管后的光分布的数理模型,并用计算机模拟探测器输出信号波形,最后分析了几种主要误差源和改善措施。 相似文献
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介绍一种在线光电式非接触测量的装置及工作原理,即由一个半导体激光器LD作测量探头的光源,面阵CMOS图像传感器在实时光电位一移测量中进行图像采集,经过处理电路得到被测物体的位移。给出实验结果并分析测量精度。 相似文献
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本介绍了借助于数码相机将干涉显微镜正气图像展示在计算机屏幕上的方法,解决了膜厚测量实验中的常见问题,加快了实验调节的速度,提高了教学效果。 相似文献
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激光扫描玻璃管外径及壁厚在线测量方法的研究 总被引:1,自引:0,他引:1
本文提出了一种可在恶劣环境中对玻璃管外径和壁厚进行高速、动态、非接触实时测量的方法,导出了数理模型,并用计算机进行模拟;该方法外径测量的理论精度可达4.5μm,壁厚测量精度为14μm;最后实验结果证明了该方案的可行性。 相似文献
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S.Y. El-Zaiat 《Optics & Laser Technology》1997,29(2):63-65
The thickness and refractive index of a thick transparent plate are measured by using an unexpanded HeNe laser beam. The laser beam is incident at different angles onto the plate; and then two reflected beams; from the front and back surfaces; are received on a distant screen: the corresponding separations between them are measured. A theoretical relation between the refractive index; thickness; angle of incidence and separation is derived. This relation is experimentally verified and shows good agreement. The errors in the measured thickness and refractive index are analysed. The method is non-contact; non-destructive and low cost. 相似文献
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A method is described of measuring the thickness of thin films by using white light fringes obtained in a double pass Michelson interferometer. The method is suitable for the determination of thickness ranging from 15 nm to 2500 nm. 相似文献
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提出了用波模的频率偏移求矩形管道中沉积层厚度的方法。在已知无沉积层矩形管道内横截面的情形下,将测量的波模频率与用有限元计算得到的波模频率进行比对,确定沉积层的厚度。给出了有限元计算结果以及实验结果(长15m,截面为449mm×425mm的矩形管道,沉积层厚度分别为40mm和60mm)及其相对误差。实验和有限元计算的结果有很好的一致性,验证了本方法的正确性。 相似文献
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A lock-in amplifier detection method for measuring the film thickness on a flat substrate has been developed by using a common-path interferometer. The signal due to the film thickness has been obtained without it being affected by the tilting of the substrate. The sensitivity was better than 0.5 nm. 相似文献
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The variation in environmental scattering background is a major source of systematic errors in X-ray inspection and measurement systems.As the energy of these photons consisting of environmental scattering background is much lower generally,the Cerenkov detectors having the detection threshold are likely insensitive to them and able to exclude their influence.A thickness measurement experiment is designed to verify the idea by employing a Cerenkov detector and an ionizing chamber for comparison.Furthermore,it is also found that the application of the Cerenkov detectors is helpful to exclude another systematic error from the variation of low energy components in the spectrum incident on the detector volume. 相似文献