1. Methane Sensing via Unbalanced Nonlinear Interferometry using a CMOS Camera
- Author
-
Dong, Jinghan, Cardoso, Arthur C., Zhou, Haichen, Zhang, Jingrui, Nie, Weijie, Clark, Alex S., and Rarity, John G.
- Subjects
Physics - Optics ,Physics - Applied Physics - Abstract
Here we present a high-sensitivity, rapid, and low-cost method for methane sensing based on a nonlinear interferometer. This method utilizes signal photons generated by stimulated parametric down-conversion (ST-PDC), enabling the use of a silicon detector to capture high-precision methane absorption spectra in the mid-infrared region. By controlling the system loss, we achieve more significant changes in visibility, thereby increasing sensitivity. The methane concentration within a gas cell is determined accurately. In addition, ST-PDC enables long-distance sensing and the capability to measure low ambient methane concentrations in the real world. A low-cost CMOS camera is employed to capture spatial interference fringes, ensuring fast and efficient detection.
- Published
- 2024