压力传感器动态校准不确定度评定

李强; 王中宇; 王卓然

doi:10.13700/j.bh.1001-5965.2014.0356

压力传感器动态校准不确定度评定

doi: 10.13700/j.bh.1001-5965.2014.0356

北京航空航天大学仪器科学与光电工程学院, 北京 100191

基金项目: 国防技术基础项目

详细信息

作者简介:
李强(1982—),男,河南新县人,博士研究生,liqiang398@163.com

通讯作者:
王中宇(1963—),男,河南洛阳人,教授,mewan@buaa.edu.cn,主要研究方向为光电技术及其应用、动态测量基础理论与技术.

中图分类号: TB939
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出版历程
- 收稿日期: 2014-06-16
- 修回日期: 2014-08-25
- 网络出版日期: 2015-05-20

Uncertainty evaluation for the dynamic calibration of pressure transducer

School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 压力传感器动态校准不确定度是表征其测量精度的重要指标.提出一种用于压力传感器动态校准不确定度评价的灰色方法.首先,使用正弦压力发生器产生标准的正弦压力信号驱动被校传感器,获取传感器特征输出;然后采用灰色关联分析处理传感器特征数据,得到权重数列;之后建立灰色模型并计算出各校准频率点的灰色偏度;最后采用加权最小二乘法去拟合以得到的工作频率范围内所有频率点的不确定数据,建立起被校压力传感器的动态校准不确定度模型.设置了幅值变化及不变两种情况下的实验验证方案,使用本文所提灰方法及黄方法分别对各方案下的数据进行处理;实验结果的对比表明:两种方案下所得动态校准不确定度曲线模型具有一致性;其中幅值变化情况下,两种方法在指定校准频率点所得校准不确定度的相对误差优于6%,在测试频率点相对误差也小于10%;幅值不变情况下,在大部分频率点处所得相对误差普遍小于5%,部分优于0.018%.实验分析证明,所提灰方法能很可靠地评估压力传感器动态校准不确定度.
- 压力传感器 /
- 动态校准 /
- 不确定度 /
- 正弦压力发生器 /
- 灰色方法
Abstract: The uncertainty of dynamic calibration for pressure transducer is a key indicator of its dynamic measurement precision. A novel grey method (GM) was proposed to evaluate the dynamic calibration uncertainty of pressure transducer. Firstly, a sine pressure generator was used to produce required sine pressure signal to drive the calibrated pressure transducer and obtain output of transducer. Secondly, using the grey relational analysis to deal with the measurement sequences outputted, a weighted value sequence was obtained. Thirdly, a grey model was established to calculate the calibration uncertainty of appointed frequency. Finally, a weighted least-square fitting method was applied to do fitting with the calibration uncertainty of appointed frequency, and then a dynamic calibration uncertainty model was established. An experimental verification under the calibration condition of changing amplitude and unchanging amplitude was set up. Grey method and Huang method (HM) were used to process the output of pressure transducer separately. The results show that the curve models of dynamic calibration uncertainty are consistent with each other in the setting condition. What is more, under changing amplitude, the relative error of calibration uncertainty obtained by the two methods is superior to 6% at appointed frequency points and is also less-than 10% at testing frequency points. Under unchanging amplitude, the relative error is less than 5% at most of frequency points and is superior to 0.018% at some testing frequency points. Based on the above analysis, it can be approved that the grey method can evaluate the dynamic calibration uncertainty of pressure transducer reliably.
- pressure transducer /
- dynamic calibration /
- uncertainty /
- sine pressure generator /
- grey method (GM)

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