摘要
针对密闭空间内的高温场温度测量需求,提出一种基于高纯石墨杆的纵向模态超声导波测温方法。利用考虑温度影响的频散方程,分析了温度影响导波波速的主要因素,优选了适用于温度测量的激励频率和模态。通过建立温度非均匀分布波导杆中导波信号渡越时间随温度变化规律的预测模型,计算得到石墨杆中的准确的回波渡越时间。开展1000℃范围内导波测温实验,验证了预测模型的正确性。实验结果表明:激励频率为30 kHz的L(0,1)模态导波测温的准确度达到了10℃以内,且多次实验重复性较好。本文的研究证明了超声导波方法的高温测量能力,为高温场温度测量提供了一种可行的解决方案。
To meet the temperature measurement requirements in a confined high-temperature environment,a longitudinal mode ultrasonic guided wave temperature measurement method based on a high-purity graphite rod is proposed.By considering the temperature-dependent dispersion equation,the main factors affecting the wave velocity due to temperature are analyzed,and suitable excitation frequency and modes for temperature measurement are selected.A prediction model for the variation in the guided wave signal transit time with temperature in a waveguide rod with non-uniform temperature distribution is established,allowing for the calculation of accurate echo transit times in the graphite rod.Temperature measurement experiments using guided waves within the range of 1000℃were conducted to verify the model’s accuracy.The experimental results demonstrate that the temperature measurement accuracy of L(0,1)mode guided waves with an excitation frequency of 30 kHz is within 10℃,with good repeatability across multiple trials.The research in this paper proves the high-temperature measurement capability of ultrasonic guided wave,providing a feasible solution for temperature measurement in extrem high-temperature environments.For the temperature measurement requirements in a confined high-temperature environment,a longitudinal mode ultrasonic guided wave temperature measurement method based on high-purity graphite rod is proposed.By considering the temperature-dependent dispersion equation,the main factors affecting the wave velocity due to temperature are analyzed,and suitable excitation frequency and modes for temperature measurement are selected.A prediction model for the variation of guided wave signal time of flight with temperature in non-uniform temperature distribution waveguide rods is established,and the accurate echo time of flight time in the graphite rod is calculated.Temperature measurement experiments using guided waves within the range of 1000℃were conducted to verify the correctness of the predictive model.The experimental results demonstrate that the accuracy of temperature measurement using L(0,1)mode guided waves with an excitation frequency of 30 kHz is within 10℃,and the repeatability of multiple experiments is good.The research in this paper proves the high-temperature measurement capability of ultrasonic guided wave methods,providing a feasible solution for temperature measurement in high-temperature environments.
作者
王婉儿
郑相锋
张新梦
高翔
刘秀成
Wang Wan′er;Zheng Xiangfeng;Zhang Xinmeng;Gao Xiang;Liu Xiucheng(College of Mechanical&Energy Engineering,Beijing University of Technology,Beijing 100124,China;Energy Group Science and Technology Research Institute Co.,Ltd,Beijing 100070,China;School of Information Science and Technology,Beijing University of Technology,Beijing 100124,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2024年第10期263-271,共9页
Chinese Journal of Scientific Instrument
基金
优秀青年科学基金(12122201)项目资助。
关键词
超声导波
温度测量
石墨杆
纵向模态
ultrasonic guided waves
temperature measurement
lraphite rod
longitudinal mode
