Mid-infrared (long-wave infrared) passive spectroscopic imaging with an uncooled micro-bolometer array sensor: background correction using Planck’s law as a basis function for general purposes such as noninvasive blood glucose sensing and remote sensing

We developed a mid-infrared passive spectroscopic imaging apparatus that uses an uncooled micro-bolometer array sensor as a light-receiving device. This apparatus makes it possible to acquire component information such as that of glucose directly emitted from the skin without a light source. However, it is difficult to obtain the background for spectroscopic measurements inside the human body. In this paper, we propose a background correction method for calculating the spectral characteristics from the acquired spectral emission intensity. The proposed method estimates the emitted light through a fitting calculation using Planck's law as a basis function.