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为了实现对压力传感器的现场自动检定,根据流体静力学平衡原理,设计了一套结构简单、检测迅速的压力传感器现场自动检定系统。系统软件设计以LabVIEW8.6作为开发工具,完成了硬件接口程序的设计和系统应用程序的设计,自动实现了压力传感器数据的采集、处理、误差计算以及原始记录和检定证书的生成。实际应用表明:该压力传感器现场自动检定系统性能稳定、操作简单,测量精度和工作效率高,具有广阔的应用前景。 相似文献
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针对压力传感器在工程测量中需要根据计量检定数据获取压力传感器输出值和所加载标准压力值之间关系的问题,采用正态检验和方差分析的方法分析了压力传感器输出电压值和标准压力值之间的特征关系。根据相关系数值的计算结果,建立一元线性回归模型。分析了一元线性回归模型的拟合优度、模型线性关系、回归系数和模型的残差。结果表明:一元线性回归分析方法能够应用于计量检定工作中的压力传感器检定数据拟合分析,这对计量检定人员研究其他类似检定数据的拟合方法具有重要的参考价值。 相似文献
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目前已有的压力相关检定规程或校准规范,均未对矿用差压传感器的信号传输误差进行评价,个别地方校准规范亦不能完全涵盖该类仪器的计量性能,文章参照现行有效的MT 393—1995《矿用差压传感器》通用技术条件和其他矿用安全仪器技术规范,选择能反映矿用差压传感器性能的基本误差、回程误差、重复性、信号传输误差、绝缘电阻作为其计量特性,提出合理、可行的校准方法,为该类仪器的量值溯源提供参考。 相似文献
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计量检定是通过一定的方法对计量单位实体进行测试,从而衡量计量器具的相关性能。其中,力学计量在应用中十分广泛,力学计量仪器主要具有以下主要特性:有关工作范围的热性、有关工作条件的特性、有关响应方面的特性、有关准确度方面的特性、有关性能方面的特性。此外,力学计量检定主要包括外观检查,接着正常性检查、计量特性的检定、对检定结果的数据进行处理和分析、检定结果的处理等步骤,主要采取综合检定和单元检定,彼此互补,使得检定结果更加可靠。 相似文献
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设计研制了一套可在低温环境下检定/校准压力传感器的装置.该装置采用模块化设计方法,各模块可独立使用,从而提高了低温压力传感器自动检定/校准装置的使用效率.该装置的工作温度可以从室温到-196℃,期间温度可连续变化,压力范围为0~ 20MPa,检定/校准装置的扩展不确定度为0.1%(k=2).该检定/校准装置的建立,有效地保证了我国航天液体火箭发动机试车所用低温压力传感器液氧管路系统压力测量的准确性,也保证了发动机性能评估的可靠性及故障诊断的准确性. 相似文献
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蔡绯 《中国计量学院学报》1996,(1)
本文根据压力传感器(静态)国家计量检定规程,对压力传感器静态检定装置进行误差分析,得出该装置的测量不确定度。最后,通过实例说明实际测量不确定度与理论分析相符合。 相似文献
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换能器的聚焦特性等声学性能是治疗超声系统的重要参数之一,在出厂前和日常维护中须精确测量。目前常用的水听器测量法结果准确,但受声压幅度及测量效率的限制,高功率量程的声功率计造价较高;而基于声全息的表面振动模式测量法可作为高声压下水听器和声功率计测量法的补充,测量小声压平面并对高幅度声压焦域进行重建。为评估声全息法的准确性,文章研究了在小声压下使用基于声全息的表面振动模式测量法对声场进行测量和重建,分析该方法与水听器测量结果之间的功率和声压误差,以及影响误差的重要参数。结果表明,基于声全息的表面振动模式测量法可重建得到与水听器直接测量相近的结果,有望对高声压下工作的换能器的声场特性进行评估。 相似文献
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Conclusions The above transducer can be used as a basis for designing an instrument for automatic checking and control of the starting and operating of powerful steam turbines. The temperature-compensated transducer can also be used for remote contactless measurements of clearances in other machines which operate at high temperatures. The above method of temperature compensation can be used for induction transducer measurements of other quantities. There exists the possibility of increasing the temperature operating range of the transducer. However, for this purpose it may be necessary to use magnetic materials with higher Curie points, for instance, cobalt. 相似文献
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Shi Huang Morawski R.Z. Barwicz A. Bock W.J. Urbanczyk W. 《IEEE transactions on instrumentation and measurement》1995,44(3):698-703
The paper deals with an electronically scanned white-light interferometric transducer for high-pressure measurements which consists of a sensor, a conditioning circuit, an analog-to-digital converter, and a digital signal processor of the output signal from the sensor. The calibration of such a transducer consists of identifying a function modeling the relationship between the raw result of measurement y, which is the output of the transducer, and the measured pressure p, taking into account an influence quantity-temperature T. An algorithm for calibration is proposed and studied 相似文献
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利用高精度压力传感器作为原位传递标准,提出了一种活塞压力计校准新方法。对传感器的分辨率和短期稳定性进行了测试,并评估了传感器线性系数对校准结果的影响。对比研究了新方法和传统方法的校准结果,两者的不确定度均约为5×10-6(k=1),且在不确定度范围内是一致的。在新方法的基础上研制了活塞压力计自动化校准装置,实现了压力控制、阀门操作和数据采集等功能的自动化。该自动化装置提高了活塞压力计校准的效率。 相似文献
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Wu X Worthington AE Gertner MR Hunt JW Sherar MD 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2007,54(5):1028-1035
Strongly focused large aperture transducers used in high-intensity focused ultrasound treatments are prone to manufacturing defects and degradation. Current methods for evaluating transducer quality measure only bulk physical changes of transducers. We have determined the pressure distribution at the transducer surface, using the angular spectrum method, to detect defects of the transducer. Three therapeutic transducers were investigated. The pressure distribution at the focal plane of each transducer was measured and input into a back-projection algorithm to calculate the pressure distribution at the transducer surface. A number of scan window sizes were used for the pressure distribution measurement at the focal plane to determine the effect on the resolution of the calculated pressure distribution at the transducer surface. Results showed that one transducer might have suffered manufacturing defects. The second transducer degraded over 1 year of use with one half of the transducer suffering a partial loss of efficiency. The third transducer remained unchanged over 1 year. The scan window of 40 mm X 40 mm at the focal plane was required to identify defects 6 mm in diameter on the transducer surface. The results demonstrate that the angular spectrum method could be a useful tool for evaluating transducer quality. 相似文献
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A high sensitivity hydrostatic piezoelectric transducer based ontransverse piezoelectric mode honeycomb ceramic composites 总被引:1,自引:0,他引:1
Zhang Q.M. Wang H. Zhao J. Fielding J.T. Jr. Newnham R.E. Cross L.E. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1996,43(1):36-43
A new piezoelectric composite transducer based on the ceramic honeycomb structure is introduced. The transducer is operated in the transverse piezoelectric (TP) d31 mode. The ceramic honeycomb configuration enables one to fabricate a TP honeycomb transducer by either embedding a honeycomb ceramic skeleton into a soft polymer matrix to form a composite or by blocking the openings of the honeycomb cells with thin layers of epoxy to form an end-capped honeycomb structure. With the unique honeycomb configuration and TP operation mode, the piezoelectric d33 response of the ceramic is nearly eliminated and the piezoelectric responses from the three orthogonal directions add together when the transducer is subjected to a hydrostatic pressure. As a result, the transducer exhibits exceptionally high hydrostatic piezoelectric response 相似文献
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