Hydrogen sensors are of great importance to detect leakage in time because the hydrogen-air mixture is highly flammable. Based on optical fiber-based configurations reported so far, using palladium coating only does not meet stringent performance targets, such as fast response time and limited deactivation caused by poisoning. Here, a palladium-gold alloy-coated optical fiber hydrogen sensor, i.e., highly tilted fiber Bragg grating (TFBG), was proposed by using its narrow bandwidth cladding modes whose effective refractive index (ERI) extends to 1.0 where the gas measurement is possible, which led to faster specific hydrogen measurement response time (a shorter stabilization time during the association and dissociation phases less than 20 s and 30 s, respectively) and improved deactivation resistance (higher than 99% per test cycle). Meanwhile, the temperature cross-sensitivity can be eliminated via referencing the “target” spectral combs to the core mode. We are sure that this promising configuration extends research directions for rapid, repeatable and high deactivation-resistance in hydrogen gas detection.

氢气传感器对于及时发现泄漏非常重要，因为氢气与空气的混合物高度易燃。根据迄今为止报道的基于光纤的配置，仅使用钯涂层不能满足严格的性能目标，例如快速响应时间和中毒引起的有限失活。在此，提出了一种使用钯金合金涂层的光纤氢传感器，即高倾斜光纤布拉格光栅（TFBG），其窄带宽包层模式的有效折射率（ERI）扩展至1.0，可以进行气体测量，这导致更快的比氢测量响应时间（在缔合和解离阶段分别小于20 s和30 s的稳定时间更短）和改进的抗失活性（每个测试周期高于99％）。与此同时，通过将“目标”光谱梳参考核心模式，可以消除温度交叉敏感度。我们确信，这种有前途的配置扩展了在氢气检测中快速，可重复和高抗失活性的研究方向。