1794-IV16
1794-IV16
1794-IV16
接触式测溢法只能通过物体随温度变化的某些特性来间接测量，其温度测量原理是选择合适的物体作为温度敏感元件.该物体的某一物理性质必须是随温度变化而变化的.且其特性是已知的。温度敏感元件与被测对象接触，并经过一定时间的热交换后.测量温度敏感元件的相关物理量.就可以知道被测对象的温度.此方法中温度敏感元件必须与被测对象充分接触.依靠传导和对流进行充分的热交换，以保证获得较高的测量精度.此方法常用于-100-1 800℃温度的测量，其特点是方法简单、可靠.测量精度高; 缺点是由于需充分的热接触，测员时需有一定的响应时间，而且使用时往往会破坏被测对象的热平衡，产生附加误差.由于工作环凌的特殊要求，使得对温度敏感元件的结构和性能要求较高。此外.温度敏感元件体可能与被测对象介质产生化学反应;温度敏感元件体还受到耐高温材料的限制.不能应用于很高温度的测量。为此，需正确选用和安装温度敏感元件。
非接触式测温法中.温度敏感元件不与被测对象接触，而是通过热辐射进行热交换.或是通过温度敏感元件来接收被测对象的部分热辆射能.再由热辐射能的大小计算出被测对象的温度.此方法常用于环境条件恶劣、温度极高的测虽场所(高可达6000℃) 此方法测温响应快、对被测对象干扰小。可测量高温、运动的被测对象.还可用于有强电磁千扰、强腐蚀的场合;其缺点是容易受到物体的发射率、测员距离、烟尘和水气等外界因素的影响，测城误差较大。为此，要求正确地选择测量方法及敏感元件的安装位置。
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