Difference equation approach to two-thermocouple sensor characterization in constant velocity flow environments
Difference equation approach to two-thermocouple sensor characterization in constant velocity flow environments
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DOI：
10.1063/1.1847412
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发表时间：
2005-01
影响因子：
1.6
通讯作者：
P. Hung;G. Irwin;R. Kee;S. McLoone
中科院分区：
文献类型：
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作者：
P. Hung;G. Irwin;R. Kee;S. McLoone
热电偶因其坚固耐用、易于制造和安装且成本低廉而成为最流行的温度测量设备之一。然而，当在某些恶劣环境中使用时，例如在燃烧系统和发动机排气中，需要大线径，从而降低测量带宽。本文讨论了一种软件补偿技术，用于根据两个热电偶的测量来解决高频波动的损失。特别是，提出了一种差分方程（DE）方法，并在模拟和恒定流速的实验测试台数据上与现有方法进行了比较。研究发现，DE 算法与广义总体最小二乘法相结合进行参数识别，在时间常数估计方面提供了更好的性能，而无需对热电偶的时间常数比进行任何先验假设。
Thermocouples are one of the most popular devices for temperature measurement due to their robustness, ease of manufacture and installation, and low cost. However, when used in certain harsh environments, for example, in combustion systems and engine exhausts, large wire diameters are required, and consequently the measurement bandwidth is reduced. This article discusses a software compensation technique to address the loss of high frequency fluctuations based on measurements from two thermocouples. In particular, a difference equation (DE) approach is proposed and compared with existing methods both in simulation and on experimental test rig data with constant flow velocity. It is found that the DE algorithm, combined with the use of generalized total least squares for parameter identification, provides better performance in terms of time constant estimation without any a priori assumption on the time constant ratios of the thermocouples.