Responsivity-based criterion for accurate calibration of FTIR emission spectra: theoretical development and bandwidth estimation.
Responsivity-based criterion for accurate calibration of FTIR emission spectra: theoretical development and bandwidth estimation.
复制标题
基于响应度的 FTIR 发射光谱精确校准标准：理论发展和带宽估计。
作者：
P. Rowe;S. Neshyba;V. Walden
傅里叶变换红外（FTIR）发射光谱仪测量的辐射亮度方差的解析表达式只存在于低噪声的极限。在此限制之外，需要用数字计算方差。此外，需要一个低噪声的标准，以确定适当校准的辐射和优化仪器带宽。在这项工作中，方差和噪声相关的光谱偏差的大小计算作为系统响应度（r）和噪声水平在其估计（σr）的函数。应用于下降流和上升流FTIR发射光谱的标准σr/r<0.3表明，对于一种仪器，仪器带宽是适当规定的，而对于另一种仪器，则需要加以限制。
An analytical expression for the variance of the radiance measured by Fourier-transform infrared (FTIR) emission spectrometers exists only in the limit of low noise. Outside this limit, the variance needs to be calculated numerically. In addition, a criterion for low noise is needed to identify properly calibrated radiances and optimize the instrument bandwidth. In this work, the variance and the magnitude of a noise-dependent spectral bias are calculated as a function of the system responsivity (r) and the noise level in its estimate (σr). The criterion σr/r<0.3, applied to downwelling and upwelling FTIR emission spectra, shows that the instrument bandwidth is specified properly for one instrument but needs to be restricted for another.