为了快速检测氢气泄漏，迫切需要开发一种更安全、浓度检测下限更低的氢气传感器。将镀有钯膜的微悬臂梁探针与单模光纤端面进行组装，设计了一种易制备且低成本的光纤氢气传感器。实验结果表明，该传感器具有超高的氢气响应灵敏度，约为-9.887 μm/%，同时具有低至1.76×10^-3%的超低检测下限和优异的重复性。在痕量氢气体积分数条件下，该传感器对氢气体积分数表现出优异的线性响应，这对痕量气体检测具有重要意义，使其在氢能源电池、核电站和太空探索中具有重要的应用价值。

In order to quickly detect hydrogen leaks, there is an urgent need to develop a safer and lower concentration detection lower limit hydrogen sensor. This article assembles a micro cantilever beam probe coated with palladium film with a single-mode fiber end face, and designs an easy to prepare and low-cost fiber optic hydrogen sensor. The experimental results show that the sensor has an ultra-high hydrogen response sensitivity of about -9.887 μm/%, while also having an ultra-low detection lower limit as low as 1.76×10^-3% and excellent repeatability. Under the conditions of trace hydrogen volume fraction, the sensor exhibits excellent linear response to hydrogen volume fraction, which is of great significance for trace gas detection and has important application value in hydrogen energy batteries, nuclear power plants, and space exploration.