共查询到15条相似文献,搜索用时 156 毫秒
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针对传统的指针式压力表检定装置工作效率低、数据无法保存追溯等问题,设计了一种基于机器视觉技术的指针式压力表智能化检定系统。首先介绍了系统的硬件架构与软件设计,然后对其图像解析的技术原理与解决方案进行了阐述,同时提出了系统的智能控制流程与检定数据的追溯复核方法,实现了2~10块相同检定点的压力表同时进行计量检定的技术方案。实测结果表明,系统图像解析平均速度为467 ms/帧,检定效率较人工检定可提升2倍以上;对于量程2.5 MPa的0.4级精密压力表和1.6级一般压力表,系统读数相对误差分别为0.08%、0.2%。 相似文献
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针对单幅CCD相机所获指针式表盘图像存在的视角误差问题,提出了基于SIFT(尺度不变特征变换)的图像拼接方法,将分别准确获取的标准器与被检器示值图像进行无缝拼接,并通过实验验证了方法的有效性和可行性。 相似文献
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图像识别在指示表检定中的应用 总被引:2,自引:0,他引:2
介绍了一种基于计算机图像识别技术实现的指示表全自动检定仪的设计方法,着重介绍了检定过程中的指针示值自动判读方法。该检定仪采用了高精度的光栅传感器与计算机技术相结合,利用了光栅测长原理测定指示表推杆的位移,采用CCD摄像头摄取表盘图象,经计算机进行图象识别及数据处理得到指针读数,从而免除了人工读数,大大提高了检定效率,可自动完成各类指示表的示值误差和回程误差的检定。详细论述了检定仪的组成原理、机械结构及仪表示值判读的软件算法,并通过实验对仪器检定结果的准确性进行了检验。 相似文献
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陶瓷量块的光干涉测量 总被引:1,自引:0,他引:1
陶瓷量块的许多性能有别于钢量块,在检定或核准之间必须对这些差异进行修正。本文讨论了检定陶瓷量块应注意的问题,介绍了陶瓷量块的光干涉测量方法,并给出了测量不确定度评定结果。 相似文献
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Wolfgang Jitschin 《真空研究与实践》2006,18(1):15-19
Pressure measurement in the mTorr range by thermal conductivity and diaphragm gauges For the reliable and simple pressure measurement in the mTorr range, the thermal conductivity and the capacitance diaphragm gauge can be used. Gauges of both types were employed for measuring the pressure in the bell jar of a piston gauge. The measuring characteristics of the gauges were checked regularly by calibrations and proved to be stable. According to the calibration data, the thermal conductivity gauge apparently is advantageous due to its better zero stability. In the practical use, however, substantial differences between the pressure readings of both gauges were observed. Therefore, in the present work the characteristics of both gauges have been investigated for the case of their actual usage, in which the pressure of an unknown gas has to be measured within a short time period. The investigations reveal, that the thermal conductivity gauge suffers from its slow response at small pressures and its dependency on gas species. In the present application, the capacitance diaphragm gauge proves as the far superior gauge. 相似文献