Unique characteristics of long-period fibre gratings fabricated by high-frequency CO2 laser pulses

作者：Wang YP^*; Rao YJ; Ran ZL; Zhu T

来源：Acta Physica Sinica, 2003, 52(6): 1432-1437.

• long-period fiber grating
• optical fiber sensor
• strain sensor
• temperature sensor
• bend sensor
• torsion sensor
• load sensor

In this paper, we report novel long-period fibre gratings ( LPFGs) written by focused high-frequency CO2 laser pulses. A number of unique characteristics of such a LPFG, such as stroin, temperature, bend, torsion and transverse-load, etc., are observed by experiment, for the first time to our knowledge. These unique features are mainly due to the asymmetrical distribution of the refractive index on the cross section of the LPFG induced by high-frequency CO2 laser pulses. Based on these unique characteristics, we have proposed a novel bend-insensitive LPFG sensor that could solve the problem of cross-sensitivity between bend and other measurements, a novel torsion sensor that can realize absolute measurement of twist rate and a load sensor that can achieve simultaneous measurement of transverse load and temperature, using a single LPFG element.

• 出版日期2003-6
• 单位重庆大学