Cavity-enhanced Raman spectroscopy for trace hydrogen gas sensing

As a potential energy carrier and industrial material, hydrogen is playing an increasingly important role in many fields. In many applications, the detection of hydrogen requires higher sensitivity, faster response and larger dynamic measurement range. Cavity enhancement Raman spectroscopy (CERS) uses Pound-Drever-Hall (PDH) frequency stabilization technology to lock the laser and high-precision optical resonator to achieve a 1900 times intracavity power gain for the detection of trace hydrogen. Under the laser input power of 7 mW, when the integration time is 100 s, the self-built cavity enhanced Raman spectroscopy device has a detection limit of 2 Pa. The experimental results also show that the Raman scattering intensity has a good relationship with the laser power and gas pressure. The linear relationship demonstrates the potential of the CERS method for high-precision gas quantitative analysis.