Sun Xiaorong, Chen Weipeng, He Ying, Sun Haiyue, Qiao Shunda, Ma Yufei
National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China.
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450008, China.
Sensors (Basel). 2025 May 6;25(9):2933. doi: 10.3390/s25092933.
In this paper, an all-fiber light-induced thermoelastic spectroscopy (LITES) sensor based on hollow-core anti-resonant fiber (HC-ARF) and self-designed low-frequency quartz tuning fork (QTF) is reported for the first time. By utilizing HC-ARF as both the transmission medium and gas chamber, the laser tail fiber was spatially coupled with the HC-ARF, and the end of the HC-ARF was directly guided onto the QTF surface, resulting in an all-fiber structure. This design eliminated the need for lens combinations, thereby enhancing system stability and reducing cost and size. Additionally, a self-designed rectangular-tip QTF with a low resonant frequency of 8.69 kHz was employed to improve the sensor's detection performance. Acetylene (CH), with an absorption line at 6534.37 cm (1.53 μm), was chosen as the target gas. Experimental results clearly demonstrated that the detection performance of the rectangular-tip QTF system was 2.9-fold higher than that of a standard commercial QTF system. Moreover, it exhibited an outstanding linear response to varying CH concentrations, indicating its high sensitivity and reliability in detecting CH. The Allan deviation analysis was used to assess the system's stability, and the results indicated that the system exhibits excellent long-term stability.
本文首次报道了一种基于空心反谐振光纤（HC-ARF）和自行设计的低频石英音叉（QTF）的全光纤光致热弹性光谱（LITES）传感器。通过将HC-ARF用作传输介质和气室，激光尾纤与HC-ARF进行空间耦合，并且HC-ARF的末端直接引导到QTF表面上，从而形成全光纤结构。这种设计无需透镜组合，从而提高了系统稳定性并降低了成本和尺寸。此外，采用了自行设计的矩形尖端QTF，其低谐振频率为8.69 kHz，以提高传感器的检测性能。选择在6534.37 cm（1.53μm）处有吸收线的乙炔（CH）作为目标气体。实验结果清楚地表明，矩形尖端QTF系统的检测性能比标准商用QTF系统高2.9倍。此外，它对不同的CH浓度表现出出色的线性响应，表明其在检测CH方面具有高灵敏度和可靠性。使用艾伦偏差分析来评估系统的稳定性，结果表明该系统具有出色的长期稳定性。
