Polarization-insensitive simultaneous measurement of strain and temperature based on long-period fiber grating inscribed on high-birefringent fiber

2006 ◽  
Author(s):  
Yong Wook Lee ◽  
Kyung Jun Han ◽  
Byoungho Lee ◽  
Jaehoon Jung ◽  
Hyun-Tak Kim
Keyword(s):  
Simultaneous Measurement ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Polarization Insensitive ◽  
Birefringent Fiber ◽  
Period Fiber Grating

Simultaneous measurement of directional torsion and temperature by using a DC-sampled helical long-period fiber grating

2021 ◽  
Vol 142 ◽  
pp. 107171
Author(s):  
Chengliang Zhu ◽  
Yong Zhao ◽  
Maoqing Chen ◽  
Ruijie Tong ◽  
Sheng Hu ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Research of Simultaneous Measurement of Temperature and Strain of Fiber Optic Cable Material

2012 ◽  
Vol 507 ◽  
pp. 30-33
Author(s):  
Xue Jun Zhang ◽  
Hong Tao Guo
Keyword(s):  
Simultaneous Measurement ◽  
Fiber Optic ◽  
Fiber Grating ◽  
Mean Square ◽  
Fiber Optic Cable ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Period Fiber Grating

Simultaneous measurement of strain and temperature was demonstrated by using a long-period fiber grating inscribed on a polarization-maintaining fiber. This paper analyses the intersect senstive questions in terms of strain and temperature of fiber optic cable material. It also proposes a new way to carry out simultaneous measurements of strain and temperature. Experimental results show mean square deviations of 15.6 με and 0.7°C for strain and temperature, respectively.

Strain-Insensitive Simultaneous Measurement of Bending and Temperature Using Long-Period Fiber Grating Inscribed on Double-Clad Fiber with CO2 Laser

2021 ◽  
Vol 21 (3) ◽  
pp. 1883-1889
Author(s):  
Min Seok Kim ◽  
Do Kyung Kim ◽  
Jihoon Kim ◽  
Seul-Lee Lee ◽  
Sungwook Choi ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Optical Fiber Sensor ◽  
Strain Range ◽  
Cost Effective ◽  
Laser Pulses ◽  
Fiber Grating ◽  
Sensor Head ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Here we report an optical fiber sensor capable of performing strain-insensitive simultaneous measurement of bending and temperature using a long-period fiber grating (LPFG) inscribed on doubleclad fiber (DCF) with a CO2 laser at ˜10.6 μm. The LPFG inscribed on DCF, referred to as a DC-LPFG, was fabricated by scanning CO2 laser pulses on an unjacketed DCF with a specific period. Due to co-directional mode coupling, the fabricated DC-LPFG has discrete attenuation bands widely distributed over hundreds of nanometers. Among these wavelength-dependent loss dips, adjacent two dips with different resonance wavelengths were selected as sensor indicators for the measurement of bending and temperature. For these two indicator dips designated as dips A and B, their bending and temperature responses were investigated in a curvature range of 4.90 to 21.91 m−1 and a temperature range of 30 to 110 °C. With increasing bending applied to the DC-LPFG at room temperature, dips A and B showed different blue shifts. The bending sensitivities of dips A and B were measured to be approximately −0.77 and 0.51 nm/m−1, respectively. Unlike the bending response, they showed red shifts of different amounts with increasing ambient temperature, while the sensor head (i.e., the DC-LPFG) remained straight without any applied bending. The temperature sensitivities of dips A and B were measured to be ˜0.094 and ˜0.078 nm/°C, respectively. Owing to their linear and independent responses to bending and temperature, bending and temperature changes applied to the DC-LPFG could be simultaneously estimated from the measured wavelength shifts of the two indicator dips using their pre-determined bending and temperature sensitivities. Moreover, in a strain range of 0 to 2200 με (step: 200 με), strain-induced spectral variations of dips A and B were also measured, and the strain sensitivities of dips A and B were evaluated as approximately −0.028 and −0.013 pm/με, respectively. These strain-induced wavelength shifts were so small that they had little effect on the measurement results of bending and temperature. Thus, it is concluded that the fabricated DC-LPFG can be employed as a cost-effective sensor head for strain-insensitive separate measurement of bending and temperature.

Few-mode fiber-embedded long-period fiber grating for simultaneous measurement of refractive index and temperature

2020 ◽  
Vol 59 (29) ◽  
pp. 9248
Author(s):  
Shuo Zhang ◽  
Xiang Li ◽  
Huiwen Niu ◽  
Qi Yan ◽  
Cuiting Sun ◽  
...  
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

A miniature ultra long period fiber grating for simultaneous measurement of axial strain and temperature

2020 ◽  
Vol 126 ◽  
pp. 106121 ◽  
Author(s):  
Shuo Zhang ◽  
Sifan Deng ◽  
Tao Geng ◽  
Cuiting Sun ◽  
Huiwen Niu ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Axial Strain ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating
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