五、差热分析仪的构造 (一)工作原理热电偶是根据热电效应制成的一种测温元件,它由两种不同的金属丝组成。金属的自由电子因受热的作用脱离运动轨道而使金属带电,产生热电势。如图22所示,将两根不同种类的金属丝相交于a点。如在a处加热,则金属丝A的电子与 Fifth, the differential thermal analyzer structure (a) working principle Thermocouple is a kind of temperature measurement element made of thermoelectric effect, which consists of two different wires. The free electrons of the metal move away from the orbit due to the action of heat and charge the metal, generating a thermoelectric potential. As shown in Fig. 22, two different kinds of metal wires are intersected at point a. If heated at a, the electrons of the wire A