Absorption Spectroscopy of H2S Near 1578 nm using CRDS

Detection of partial fault in SF
6
gas insulation equipment has become a hot spot in high-voltage field. The insulation fault can be accurately diagnosed by measuring decomposition product, where H
2
S is a characteristic product of severe overheat fault. With the advantage of high precision, Cavity Ring-Down Spectroscopy is capable of ppm level measurement of trace H
2
S. In this paper, a CRDS platform is built, laser modulation hardware circuit and absorption peak scan algorithm are designed to acquire partial spectrum of H
2
S, which contributes to H
2
S spectroscopy and further CRDS platform development.