Khurram Karim Qureshi

Current smartphone-based portable sensor designs are generally limited to single-point sensing, and extending them to multipoint parameter applications introduces challenges like signal decoupling and integration. This study presents a method for a portable dual-parameter optical fiber sensing system fully integrated with a smartphone platform. The proposed method is demonstrated for liquid-level and refractive index (RI) measurement.

4. Method of Calibration This section discusses the materials and apparatus needed for calibration and the experimental setup of the three key OBS techniques for junction temperature measurement in power electronics applications. 4.1. IRC Sensing Technique The calibration setup for thermal imaging consists of a lens with a predetermined working distance to focus the thermal radiation on the camera’s detector []. In the literature, the reported distance is between 15 and 25 cm.