【摘要】 针对便携式傅里叶变换红外光谱仪测量比辐射率的不确定性,提出了三种改进的波谱比辐射率测量方法.方法1和方法2借助于附加设备改变环境辐照度实现病态方程可解.方法3基于灰体假设,使用迭代求解获得最接近样品的真实温度的温度解,进而计算得到样品的比辐射率.使用温度测量和傅里叶光谱仪观测计算获得波谱比辐射率作为参考的比辐射率结果,对三种改进的方法进行对比和验证.结果表明,对于高比辐射率的石英板和纸板,三种改进方法的测量结果和参考值吻合较好.而对于低比辐射率的锈铁板和铝板,方法 3最为接近参考比辐射率结果,而方法 1,方法 2由于需要过多的观测环节,存在一定的偏差.此三种方法将为改进便携式傅里叶变换红外光谱仪测量提供依据.更多还原

【Abstract】 To minimize the uncertainties related to the FTIR spectrometer,three improved methods were proposed to measure the spectral emissivity. For method 1( M1) and method 2( M2),an invented device was used to change the environment radiation which makes the ill conditioned equation solvable. Method 3( M3) is based on the gray body assumption,and an iterative procedure was applied to derive the temperature of samples,then the spectral emissivity can be retrieved based on this temperature and the FTIR measurements. In order to validate these methods,the emissivity derived from the measured temperature was used as a reference. The results indicate that for the samples with high emissivity,such as quartz plates and cardboard,three improved methods have comparable accuracy; while for the samples with low emissivity,such as rusty iron plate and aluminum plate,the M3is more reliable than the other two methods. M1and M2need to go through more procedures than M3,and this may lead to some deviation from the reality. Overall,three improved methods greatly improved the spectral emissivity measurements with FTIR spectrometer.更多还原