Development of Non-contact Thermal Monitor Using Fiber Optics

设计和制造用于单晶衍射仪和非接触式温度测量系统的小型电阻炉是第一个目的。对于小型电阻炉，由于测角仪上样品周围的空间很小，所以用热气流炉代替了电流炉。这可以吹出高达800ﾟC的热气体。温度通过改变电压或气体压力进行控制，并进行温度监控。测温系统以气瓶或空压机为气源，测温系统采用光纤光缆连接探测头，采用“波段比法”测量灰体目标的发射率。该体系由以下三个主要部分组成。一种是与光斑直径0.5 mm、工作距离50 mm的微光点透镜单元相连的光纤组件。纤维是柔性的，曲率半径为2“。第二部分是探测头组件，包括硫化铅带通滤光器、音叉斩波器和前置放大器。这使得能够测量700-1,510ﾟC期间的温度。探测器头组件通过电缆连接到面板控制器。前面板上有电源开关、数字面板仪表、增益控制、频谱控制等，后面板上有输入/输出连接。设计了定标源和背光源，铁弹性材料LAP_5O_14&GT；的高温单晶衍射实验计划作为测试实验，只进行了室温实验。

It was the first purpose to plan and to manufacture the miniature electric resistance furnace for single crystal diffractometer and the non-contact temperature measuring system. For the miniature electric resistance furnace, the hot gas stream furnace was made instead of electric one, because of the very poor space around the specimen on the goniometer. This can blow out hot gas up to 800ﾟC. The temperature was controlled by changing electric voltage or gas pressure with thermally monitoring. Gas cylinder or air compressor serves as source of gas.The temperature measuring system is characterized by the fiber optics cable connected to the detector head, and the emissivity independent for greybody target by applying the "band ratio method". This system is composed of following three principal parts. One is optical fiber assembly attached with the micro spot lens cell which has spot diameter 0.5mm and working distance 50mm. Fiber is flexible and the radius of curvature is 2". Second part is the detector head assembly, which contains the lead sulfide band filter, tuning-fork chopper and preamplifier. This enable to measure temperature during 700-1,510ﾟC. Detector head assembly is connected by cable to the panel controller. On front panel there are power switch, digital panel meter, gain controls, spectrum control and so on, and there is input/output connections on rear panel. The calibration source and backlighting source are equipped.High temperature single crystal diffraction study of ferroelastic material, LaP_5O_<14>, was planned as test experiment, only room temperature experiment has been done.