An optical design model of dual-elliptical mirrors near-infrared absorption spectroscopy (NIRAS) for detection of diabetes is proposed. This design model improves the optical efficiency of the conventional NIRAS system without the use of optical components. We used the Henyey–Greenstein scattering skin model in the simulation to calculate the light scattering phenomena. Based on the virtual skin model, the dual-elliptical mirrors NIRAS system can focus the light-emitting diode (LED) light into deeper depths of the human skin and collect more backscattered light. The dual-elliptical mirrors NIRAS system can enhance the light collection efficiency by 1.6 times that of the conventional NIRAS system and 66 times that of the dual-elliptical lens NIRAS system. In terms of assembly tolerance, the normalized light collection efficiency (LCE) of LED and photodiode can be maintained above 0.9 and 0.68, respectively, at a 0.2-mm displacement. The LCEs of the φ and θ rotations are at least 0.95 with a 5-deg tilt error of the chips.
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