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《Transactions of China Electrotechnical Society》 1993-01
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Study of Hot-Wire Detection Melting-Point Detecting of High Melting Non-Metallic Material

Zeng Li; Wu Ning; Liu Heping (Chongqing University)  
Hot wrie detection is a method detecting quickly on material melting-point.The method not only uses thermocouply as a heating element. but also. uses it as temperature sensing element. It collects heating and detecting function. In this paper. westudy the theoretics and techniques of hot writ detection for high-melting non-metallicmaterial. design. install and adjust an instrument of melting-point detection for highmelting non metallic material according to the basic principle of hot-wrie method and relative knowledge of power electronic technology. microelectronicsand non electrical measurement etc. The paper analyses the technical mattersand its solving approach about electronic circuit rcalization of hot wrie method. theoverall design scheme is advanced then. The paper discusses the switching voltage stailizer heating circuit, switching circuit. detecting circuit and sample hold circuit. Thefinal part gives the experiment data.
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