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

IF 1.1 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY Physics of Wave Phenomena Pub Date : 2023-10-16 DOI:10.3103/S1541308X23050102

Yong Tang, Qiuyue Ran, Yulong Lian, Yunfeng Bai

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Abstract

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.

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一种利用螺旋长周期光纤光栅测量液体浓度的新方法

本研究采用双波长差分法测量螺旋长周期光纤光栅（H-LPFG）的液体浓度。利用商用焊机对周期为782μm的光栅进行螺旋加工。共振峰出现在1520nm附近。耦合模式理论用于研究作为液体浓度函数的透射强度。理论上，透射强度仅取决于液体浓度。然后，我们实验研究了透射强度和浓度之间的关系，作为1495和1518nm波长的函数。这两个地方的透射强度是相对于液体浓度的e指数。由于透射强度测量浓度受到光源波动的影响，因为光源的波动会影响透射强度。最后，提出了一种仅使用滤波器和光检测器的H-LPFG解调系统。这为开发高精度、低成本、高潜力的液体浓度传感器提供了一种新的途径。

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来源期刊

Physics of Wave Phenomena PHYSICS, MULTIDISCIPLINARY-

CiteScore

2.50

自引率

21.40%

发文量

审稿时长

>12 weeks

期刊介绍： Physics of Wave Phenomena publishes original contributions in general and nonlinear wave theory, original experimental results in optics, acoustics and radiophysics. The fields of physics represented in this journal include nonlinear optics, acoustics, and radiophysics; nonlinear effects of any nature including nonlinear dynamics and chaos; phase transitions including light- and sound-induced; laser physics; optical and other spectroscopies; new instruments, methods, and measurements of wave and oscillatory processes; remote sensing of waves in natural media; wave interactions in biophysics, econophysics and other cross-disciplinary areas.