fiber optic
Recently Published Documents





2022 ◽  
Vol 149 ◽  
pp. 107816
M. Leone ◽  
M. Consales ◽  
G. Passeggio ◽  
S. Buontempo ◽  
H. Zaraket ◽  

2022 ◽  
Vol 579 ◽  
pp. 121374
A.P. Velmuzhov ◽  
V.S. Shiryaev ◽  
M.V. Sukhanov ◽  
T.V. Kotereva ◽  
B.S. Stepanov ◽  

Optik ◽  
2022 ◽  
Vol 251 ◽  
pp. 168033
Chao Zhang ◽  
Yao Mao ◽  
Xi Zhou ◽  
Yu Chen ◽  
Ge Ren

2022 ◽  
Vol 2 ◽  
Meng-Ya Sun ◽  
Bin Shi ◽  
Jun-Yi Guo ◽  
Hong-Hu Zhu ◽  
Hong-Tao Jiang ◽  

Accurate acquisition of the moisture field distribution in in situ soil is of great significance to prevent geological disasters and protect the soil ecological environment. In recent years, rapidly developed fiber-optic sensing technology has shown outstanding advantages, such as distributed measurement, long-distance monitoring, and good durability, which provides a new technical means for soil moisture field monitoring. After several years of technical research, the authors’ group has made a number of new achievements in the development of fiber-optic sensing technology for the soil moisture field, that is, two new fiber-optic sensing technologies for soil moisture content, including the actively heated fiber Bragg grating (AH-FBG) technology and the actively heated distributed temperature sensing (AH-DTS) technology, and a new fiber-optic sensing technology for soil pore gas humidity are developed. This paper systematically summarizes the three fiber-optic sensing technologies for soil moisture field, including sensing principle, sensor development and calibration test. Moreover, the practical application cases of three fiber-optic sensing technologies are introduced. Finally, the development trend of fiber-optic sensing technology for soil moisture field in the future is summarized and prospected.

2022 ◽  
Zhiqiang Shao ◽  
Yalin Wu ◽  
Shuang Wang ◽  
Yan Wang ◽  
Zhiqiang Sun ◽  

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 582
Özkan Kahveci ◽  
Caner Gençoğlu ◽  
Tuncay Yalçinkaya

Fiber-optic gyroscopes (FOGs) are common rotation measurement devices in aerospace applications. They have a wide range of diversity in length and in the winding radius of the coil to meet system requirements. Every dimensional parameter in the coil influences the dynamic response of the system, eventually leading to measurement errors. In order to eliminate the errors and to qualify the system, after the design and production stages, a deep and comprehensive testing procedure follows. In this study, the dynamic behavior of a quadrupole wound fiber-optic coil is investigated. First, pre-wound fiber-optic coils are tested with an impact modal test, where the mode shapes and natural frequencies are determined with structural data acquisition. For the modal analysis, a finite element (FE) model is developed where a representative volume element (RVE) analysis is also included to properly consider the influence of the microstructure. The experimental and numerical results are compared and validated. Moreover, an estimation model is proposed for a type of coil with different fiber lengths. Finally, the estimated coil set is produced and tested employing the same methodology in order to illustrate the capacity of the developed framework.

Sign in / Sign up

Export Citation Format

Share Document