The Fos InfraS series sensor is a high-precision broadband fiber optic infrasound sensor, which is a fundamental instrument for observing and studying infrasound waves. This equipment can be used for long-distance detection of various non natural events, earthquake co seismic and pre earthquake, geological disasters such as volcanoes, landslides, mudslides, meteorological disasters such as typhoons, strong convection, and other natural event monitoring fields. It has strong environmental adaptability and is suitable for various fixed or mobile observation arrangements. It also has the characteristics of small size, light weight, low power consumption, and low output signal self noise.