论文部分内容阅读
热敏电阻接头的效率定义为热敏电阻吸收的功率和实际输入到接头的功率之比。由于热敏电阻接头内部不可避免地存在壁损耗,接触损耗和热敏电阻的玻壳损耗等。这个效率不能达到百分之一百。测定热敏电阻接头的效率对于功率计的误差分析及梭准,热敏电阻接头的研制和改进具有重要的实际意义。自1949年Kerns提出这一个问题以来,至1961年止,国外曾先后发表了五篇有关文献,介绍了五种不同的测量或计算方法。本文首先综述了它们的理论基础,介绍了各种测量方法,并在此基础上导出了利用热敏电阻为某一阻值时接头输入端的节点阻抗值直接计算效率的公式。由此公式,不仅得到一种简单的测量和计算方法,而且由公式作出的输入端节点阻抗-热敏电阻阻值曲线符合Ginzton提出的近似直线性。文中列出了用五种不同方法测试三厘米可调谐波导式热敏电阻接头的效率的实验结果,并从实验和计算两方面比较了这些方法的优劣之处。最后,对这些方法的应用以及有待进一步研究的若干问题提出了粗浅的建议。
The efficiency of a thermistor connector is defined as the ratio of the power absorbed by the thermistor to the power actually input to the connector. As the thermistor connector inside the inevitable existence of wall loss, contact loss and thermistor glass loss and so on. This efficiency can not reach 100%. Determining the efficiency of a thermistor connector has important practical implications for error analysis of a power meter, development and improvement of shuttle pins and thermistor connectors. Since the issue was raised by Kerns in 1949, up to 1961, five related literatures were published overseas, and five different measurement or calculation methods were introduced. This paper first reviews their theoretical foundation, introduces various measurement methods, and on this basis, derives the formula for directly calculating the node resistance value of the input terminal when the thermistor is a certain resistance value. From this formula, not only a simple method of measurement and calculation is obtained, but also the input node resistance developed by the formula-thermistor resistance curve conforms to the approximate linearity proposed by Ginzton. In this paper, the experimental results of five different methods to test the efficiency of three centimeter tunable waveguide thermistor connectors are listed. The advantages and disadvantages of these methods are compared both experimentally and computationally. Finally, some superficial suggestions are put forward on the application of these methods and some issues to be further studied.