Ultrasonic-assisted point one-shot mid-infrared Fourier spectroscopy for realization of ear-clip-type non-invasive blood glucose sensors: Ultra-miniature point one-shot mid-infrared spectroscopic imager (diameter: 10 mm; thickness: 25 mm) configured using a single lens (1st report)

Abstract

We propose the point one-shot mid-infrared Fourier spectroscopic imager, which is composed of only a single Ge lens (diameter: 6 mm; thickness: 5 mm) and a two-dimensional array device. The lens is a nonspherical lens on the front side and a dual-axis inclined wedge prism at the rear side. The objective beams, which have different optical path lengths because of the effects of the prism, are imaged using the array device and we obtain a two-dimensional spatial fringe pattern. We can improve the wavelength resolution analytically by connecting the same optical path difference (OPD) pixels of the horizontal lines at different rows, even though we use low-resolution cameras.