基于近红外光谱的高精度测温系统

目前红外测温方法难以消除复杂环境下外来辐射的干扰,导致测温精度低,设计了一种高精度的红外测温系统。该系统提出了由宽带滤光片和三级干涉滤光器结合的滤光方法,根据该方法对高温物体发出的近红外光谱进行滤光,将高温背景光和环境干扰光滤掉,得到两个单色光谱,经红外探测器接收获得其辐射功率比,通过计算得出物体温度。该系统透过的单色光谱带宽仅有1nm,将透射光谱以外的背景光辐射和环境光源辐射抑制达8个数量级,降低了因被测对象周围环境升温引起的测温误差,提高测温系统的精度。最后通过实验验证了该测温系统的可行性,精度达0.2%。

Research on high-precision temperature measurement system based on near infrared spectroscopy

At present,the interference from outside radiation under the complex environment is difficult to eliminate by using theinfrared thermometry method.It leads to the low measurement accuracy.In the present paper,a high-precision infrared temper-ature measurement system was designed.The light filter method is presented in this system.The broadband filters and three-level interference filter were combined in this method.According to the method,the near-infrared spectra sent out by high tem-perature object is fil...