WANG Huaming,LU Huiguo,HU Jingsong,et al.Signal Acquisition and Nonlinear Fitting of Vibrating Cylinder Barograph[J].Journal of Chengdu University of Information Technology,2026,41(01):17-23.[doi:10.16836/j.cnki.jcuit.2026.01.003]
高精度智能气压仪信号采集及非线性拟合
- Title:
- Signal Acquisition and Nonlinear Fitting of Vibrating Cylinder Barograph
- 文章编号:
- 2096-1618(2026)01-0017-07
- Keywords:
- vibration cylinder; nonlinearity; FPAG; equal precision measurement method; polynomial curve fitting
- 分类号:
- TM930.1
- 文献标志码:
- A
- 摘要:
- 运用振动筒式气压传感器进行气压测量,综合分析影响其传感器精度的主要因素及输出信号与气压为非线性关系。振动筒传感器具有较高的灵敏度和稳定性,当气压变化时振动筒内的气压变化会导致振动筒的固有频率变化,通过测量频率的变化,可以计算出当前的气压值。FPGA频率采集模块用于精确采集振荡频率信号,以便进一步处理和分析。对准确信号采集进行分析得知传统的周期测量法与直接测量法对定时器的精度要求非常高,使用单片机进行周期测量很难达到,会产生被测时钟周期的误差,在应用中有一定的局限性,而等精度测量法可以提高测量精度并且减少误差,能检测到微小变化及差异,适用于高分辨率的测量。在不同气压条件下采集频率信号,并记录相应的气压值,对数据进行温度补偿以及采用多项式曲线拟合方法,将频率信号转换为气压值过程中进行高阶及权重拟合优化,气压测量范围是500～1100 hPa,测量误差小于等于万分之一。
- Abstract:
- The vibration cylinder pressure sensor is used to measure the pressure. The main factors affecting the accuracy of the sensor and the nonlinear relationship between the output signal and the pressure are analyzed. A change in air pressure will result in a corresponding alteration in the natural frequency of the vibration cylinder. By measuring the change in frequency, it is possible to calculate the current pressure value. The FPGA frequency acquisition module is used for accurate acquisition of oscillating frequency signals, which are then subjected to further processing and analysis. Through the analysis of accurate signal acquisition, it is found that the traditional period measurement method and direct measurement method impose exceedingly accuracy requirements on timers. It is challenging to achieve the period measurement by using single chip microcomputer, which will result in the error of the measured clock cycle. It should be noted that the application is subject to certain limitations. However, the equal precision measurement method has the potential to enhance the accuracy of measurements and minimise the occurrence of errors. The ability to detect small changes and differences is suitable for high-resolution measurements, thereby fulfilling our needs. The frequency signal is collected under different pressure conditions, and the corresponding pressure value is recorded, the temperature compensation of the data is carried out, and the polynomial curve fitting method is used to convert the frequency signal into the pressure value. The pressure measurement range is 500～1100 hPa, and the measurement error is less than or equal to 1/10000.
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备注/Memo
收稿日期:2024-08-06
基金项目:国家自然科学基金资助项目(42075129)
通信作者:卢会国.E-mail:luhuiguo@cuit.edu.cn