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Strain measurement based on fixed wavelength transmission of tapered long-period fiber grating

Tang Yong, Zhang Hao, Zhang Li, Yu Xin Feng, Bai Yun Feng

Optica Applicata

2022

Vol. 52, nr 4

511--519

This paper studies the relationship between transmission intensity and strain based on tapered long-period fiber grating at a fixed wavelength. In experiments, tapered long-period fiber grating was prepared by the electric melting method. Experimental results show that two resonance peaks appeared at 1482 and 1537 nm, respectively. Here is the elaboration of the relationship between the resonant wavelength and the strain, its wavelength-strain sensitivity is 20 pm/με, and the linearity was negative. Then our next study was about the relationship between transmission intensity and strain at a fixed wavelength. The results show that the transmission intensity at a fixed wavelength is related to the exponent with strain. The coupled-mode theory is applied to simulate the relationship between fixed wavelength and strain. The simulation results matched the experimental results. Two fixed wavelength transmission intensity ratio was used, and the ratio showed a linear relationship with the strain, and the slope is –0.018 dB/με. Therefore, within the 0.01% resolution of our detector, we could resolve a 0.16 με strain change. We can select the appropriate light source and detector to achieve higher measurement accuracy. Thus, there is a great potential in fiber grating strain sensors.

Characteristic of non-adiabatic tapered fiber towards humidity

Jali Mohd Hafiz, Rahim Hazli Rafis Abdul, Johari Md. Ashadi Md., Yusof Haziezol Helmi Mohd, Ahmad Aminah, Baharom Mohamad Faizal, Thokchom Siddharth, Harun Sulaiman Wadi

Przegląd Elektrotechniczny

2021

R. 97, nr 10

49--52

This paper reported the characterization of non-adiabatic tapered fiber using flame brushing technique towards humidity. The tapered fibers were exposed to relative humidity concentrations level ranging from 35%RH to 85%RH to observe the optical characteristic. There are several criterions considered for this study such as scattering coefficient (αmf), transmission loss (TL), output light intensity and enhancement factor (ɣ). The relationship between the waist diameter and the other criterions towards the %RH level has been successfully investigated.

W tym artykule opisano charakterystykę nieadiabatycznego włókna stożkowego przy użyciu techniki szczotkowania płomieniowego w w zastosowaniu do pomiaru wilgotności. Włókna stożkowe badano przy różnych poziomach wilgotności względnej w zakresie od 35% RH do 85% RH, aby obserwować charakterystykę optyczną. W tym badaniu bierze się pod uwagę kilka kryteriów, takich jak współczynnik rozproszenia (αmf), strata transmisji (TL), natężenie światła wyjściowego i współczynnik wzmocnienia (ɣ). Pomyślnie zbadano związek między średnicą talii a innymi kryteriami w stosunku do poziomu %RH.