Research On Technology Of Transient Surface Ultra-high Temperature Sensor

Temperature is an important physical quantity in the research and production. In aviation, aerospace engine, nuclear industry and of explosive trials, there are many subjects need to measure the transient (<1ms) ultra high temperature (2000℃～3000℃), whose work is characterized by high temperature, change rapidly, often To not repeat the one-time process, therefore, measurement conditions are very bad, technology is very difficult. Based on the law of plank blackbody radiation, sapphire optical fiber sensor for the transient ultra-high temperature test opens up new horizons.Relative to the current extensive use coating process of plating iridium, platinum and other precious metal film, then in its ceramic protective film coated on the black body cavity, this paper presents a magnetron sputtering method and plasma thermal spray coating system for tantalum, molybdenum or tungsten film, and in its last film coated zirconia coating to protect the program, its low cost, high-temperature limit advantages. Photoelectric conversion module of the sensor applied a new type of solid-state photomultiplier as the photoelectric conversion device, which has low noise, fast response, small size, to avoid electromagnetic interference, low operating voltage and other characteristics, but also directly coupled with optical fiber, reduce transmission loss and simplify the design of the sensor. By experiment tested the optical properties of solid-state photomultiplier and obtained the relationship between its output voltage and received flux. Temperature sensor on assembled a preliminary performance was tested,the results verified the feasibility of the design.In This paper, we design the static calibration system of transient surface ultra-high temperature sensor, which uses standard high-temperature blackbody to check radiation thermometer, and then the sensor will be placed in constant temperature zone which is heated by oxyhydrogen flame, the temperature of the constant temperature zone is measured by the standard radiation thermometer and sensor at the same time, then compares the resultant, thus gets the static characteristic parameters K. In addition, the oxyhydrogen flame heating temperature field in a short time to achieve maximum value and remained constant within a certain period of time, therefore the oxyhydrogen flame can be used for preparation of constant temperature source in static calibration system. Using ANSYS software simulates the temperature distribution inside of the heated ceramic shell.