Wang Wenhua
School of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China.
Micromachines (Basel). 2023 Apr 26;14(5):939. doi: 10.3390/mi14050939.
Optical fiber sensors fabricated by bonding have several limitations. To address these limitations, a CO laser welding process for an optical fiber and quartz glass ferrule is proposed in this study. A deep penetration welding method with optimal penetration (penetrating the base material only) is presented to weld a workpiece according to the requirements of the optical fiber light transmission, size characteristics of the optical fiber, and the keyhole effect of the deep penetration laser welding. Moreover, the influence of laser action time on the keyhole penetration is studied. Finally, laser welding is performed with a frequency of 24 kHz, power of 60 W, and duty cycle of 80% for 0.9 s. Subsequently, the optical fiber is subjected to out-of-focus annealing (0.83 mm, 20% duty cycle). The results show that deep penetration welding produces a perfect welding spot and has good quality; the hole generated from deep penetration welding has a smooth surface; the fiber can bear a maximum tensile force of 1.766 N. The performance of the optical fiber sensor is stable, and the maximum pressure deviation corresponding to the cavity length fluctuation is about 7.2 Pa. Additionally, the linear correlation coefficient R of the sensor is 0.99998.
通过粘结制造的光纤传感器存在若干局限性。为解决这些局限性，本研究提出了一种用于光纤与石英玻璃插芯的CO激光焊接工艺。根据光纤光传输要求、光纤尺寸特性以及深熔激光焊接的小孔效应，提出了一种具有最佳熔深（仅穿透母材）的深熔焊接方法来焊接工件。此外，研究了激光作用时间对小孔熔深的影响。最后，以24kHz的频率、60W的功率和80%的占空比进行0.9s的激光焊接。随后，对光纤进行离焦退火（0.83mm，20%占空比）。结果表明，深熔焊接产生了完美的焊点且质量良好；深熔焊接产生的小孔表面光滑；光纤可承受的最大拉力为1.766N。光纤传感器性能稳定，与腔长波动对应的最大压力偏差约为7.2Pa。此外，该传感器的线性相关系数R为0.99998。
