This work presents a novel fiber optic Mach-Zehnder interferometer (MZI) sensor that can measure curvature due to its structure. This structure employs a 2-section MZI filter constructed from SMF-28 fiber using the core offset technique. The source in the 1480-1600 nm range shows intermodal energy interference between the core and the cladding and exhibits six spacing notches for sensing applications. The sensibility obtained was of 0.00018 nm/uW when curvature is applied. However, by including a thin film based on Zinc Oxide (ZnO) and another with Aluminum-doped zinc oxide (AZO) in the sensing arrangement, an increase in the sensitivity was detected with a value of 0.00015 nm/uW and 0.00016 nm/uW, respectively. This sensor can be used for applications in various fields, such as environmental monitoring, engineering, and process control.
This work introduces a pH detector based on a Mach-Zehnder Interferometer (MZI) designed to operate in pH 4.0, 7.0, and 10.0 buffer solutions. The sensor utilizes the monitoring for a particular solution comprising Alizarin Red S and OH carbon nanotubes at a wavelength of 1559 nm.
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