傅里叶变换红外光谱仪光谱响应非线性试验研究

Experimental Study of the Linearity of the FTIR Spectrometry Spectral Response

利用傅里叶变换红外光谱仪测量不同温度黑体的光谱辐射,采用最小二乘法进行数据拟合,获得了光谱仪光谱响应的线性特性。为了更好地描述仪器的线性特性,引入"光谱线性度"的概念,通过实验得到DTGS及MCT探测器对应的仪器的光谱线性度曲线图,直观反映出仪器光谱线性特性及影响因素,据此方法可以确定线性度满足使用要求的探测器、测量光谱范围、测量目标的能量范围,反映影响仪器线性度的内外因素,具有重要的实际意义。

The present study assesses the linearity of a FTIR spectrometry using the blackbody. The least square method is used for the data fitting to gain the linearity of the spectral response of the spectrometry. The conception of＂spectral linearity＂is adopted and the curve diagram of the spectral linearity is obtained for the facilities of DTGS and MCT detectors,which reflects the spectral linearity characteristics and the influencing factors of the facilities. The detector,spectral range,and energy range which meet the requirements can be determined by the method,and the internal and external factors influencing the linearity can be shown by the diagrams. It is very important in the application.