Work

All-optical-fiber highly sensitive hot-wire flowmeter based on FPI vernier effect in cobalt-doped fiber

Year: 2025

Type: article

Abstract: An all-optical-fiber hot-wire flow sensor is proposed for measuring extremely low flow velocities in air and water. The sensor detects flow velocity changes by measuring heat loss. A femtosecond laser is used to inscribe the hot-wire vernier effect structure entirely within the fiber core, minimizing external perturbations. This structure comprises a Fabry-Perot interferometer (FPI) in cobalt-doped fiber (length: 534.48 μ m) and a second FPI in single-mode fiber (length: 503.92 μ m). The resulting miniature flowmeter demonstrates high sensitivity, with measurement ranges of 0.5 to 5.98 m/s in air (with a maximum wavelength shift of 18.35 nm) and 0.05 to 0.92 cm/s in water (with a maximum wavelength shift of 1.89 nm). Its compact design, high sensitivity, and robustness against environmental interference highlight its potential for applications in petroleum logging, oil and gas pipeline transportation, and carbon capture and storage (CCS).

Source: Optics Express

DOI: 10.1364/oe.558952

Authors: Tianxi Zhang, Minghui He, Haozhe Ji, Ruohui Wang, Dan Su, Xueguang Qiao

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, Education Department of Shaanxi Province

Awards: G345676609, G5143403737, G6270095260, G7679168899