摘要
针对固体火箭航空发动机试车时燃烧室内测温需求,选取恰当的温度敏感元件材料,采用高熔点的钨铼合金波导杆作为温度敏感元件,通过对材料的物理特性、超声传播理论的分析,选用长1 m,直径1 mm,区节长度43 mm的钨铼波导杆作为超声温度传感器敏感元件。在超声激励信号频率为250 kHz,数据采集卡频率为40 MHz的条件下设计超声测温系统。通过实验室标定,验证测试系统的可靠性,测试得到20℃~1800℃的特征信号,通过互相关算法计算得到不同温度下的时延值,将时延值与温度进行曲线拟合,得到温度和时延值的关系式,1000℃以上,每100℃的时延值变化范围可达197 ns。
Aiming at the demand of temperature measurement in combustion chamber during solid rocket aero engine test run,selection of proper temperature sensitive element material is a critical step to explore the ultrasonic temperature measurement technology,with high melting point metal alloy waveguide rod as a temperature sensor.Through the analysis of the physical properties of materials and the theory of ultrasonic propagation,1 m long,1 mm in diameter,section area of 43 mm length tungsten-rhenium waveguide rod are choosen as the ultrasonic temperature measuring sensing element.The ultrasonic temperature measuring platform is designed under the condition that the frequency of ultrasonic excitation signal is 250kHz and the frequency of data acquisition card is 40MHz.The reliability of the test system is verified by laboratory calibration,and the characteristic signals ranging from 20℃to 1800℃are obtained.The delay values at different temperatures are calculated by the cross correlation algorithm,and the curve fitting between the delay values and the temperature is carried out to obtain the relationship between the temperature and the delay values.The time delay ranges is up to 197ns per 100℃.
作者
杨国权
魏艳龙
王高
梁海坚
郭晋秦
Yang Guoquan;Wei Yanlong;Wang Gao;Liang Haijian;Guo Jinqin(School of Computer Technology,Taiyuan Normal University,Jinzhong Shanxi 030619,China;School of Information and Communication Engineering,North University of China,Taiyuan Shanxi 030051,China;Department of Electronic Engineering,Taiyuan Institute of Technology,Taiyuan Shanxi 030008,China)
出处
《山西电子技术》
2023年第1期56-59,共4页
Shanxi Electronic Technology
基金
山西省自然科学基金项目(20210302124541)
山西省自然科学基金项目(202103021224337)。
关键词
超声测温
钨铼合金
温度
时延值
ultrasonic thermometry
tungsten-rhenium alloy
temperature
time delay
