A Novel Method for Measuring the Concentration of Liquids using Helical Long-Period Fiber Gratings

This research involves a novel liquid concentration measurement of helical long-period fiber grating (H-LPFG) by dual-wavelength difference. The grating with a period of 782 μm is spirally processed via the commercial welding machine. The resonant peak appears around 1520 nm. Coupled mode theory is...

Full description

Saved in:
Bibliographic Details
Published in:Physics of wave phenomena 2023-10, Vol.31 (5), p.363-370
Main Authors: Tang, Yong, Ran, Qiuyue, Lian, Yulong, Bai, Yunfeng
Format: Article
Language:English
Subjects:
Acoustics
Coupled modes
Demodulation
Gratings (spectra)
Light sources
Luminous intensity
Measurement methods
Physics
Physics and Astronomy
Quantum Optics
Wave Structures and Their Diagnostics
Welding machines
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This research involves a novel liquid concentration measurement of helical long-period fiber grating (H-LPFG) by dual-wavelength difference. The grating with a period of 782 μm is spirally processed via the commercial welding machine. The resonant peak appears around 1520 nm. Coupled mode theory is used to study the transmission strength as a function of liquid concentration. Theoretically, the transmission intensity depends only on the liquid concentration. Then, we experimentally researched the relationship between the transmission intensity and the concentration as a function of the wavelength at 1495 and 1518 nm. Transmission intensity at these two places is e-exponential with respect to the liquid concentration. Due to the transmission intensity measurement concentration is influenced by the fluctuation of the light source, since the fluctuation of the light source will affect the transmission intensity. Finally, a demodulation system for H-LPFG is proposed using only filters and light detector. This allows a new way to develop a high-precision, low-cost, high-potential liquid concentration sensor.
ISSN:1541-308X
1934-807X
DOI:10.3103/S1541308X23050102