A5019002780- Advanced Fiber Optic Sensors
- Geophysics and Sensor Technology
- Spectroscopy and Laser Applications
- Atmospheric and Environmental Gas Dynamics
- Seismic Waves and Analysis
- Mechanical and Optical Resonators
- Seismic Imaging and Inversion Techniques
- Underwater Vehicles and Communication Systems
- Semiconductor Lasers and Optical Devices
- Atmospheric Ozone and Climate
- Underwater Acoustics Research
- Photonic and Optical Devices
A high-sensitivity ultralow-frequency fiber optic interferometric seismometer using phase feedback control is proposed and demonstrated. The principle of sensitivity improvement described, the characteristics seismometer, including vibration sensing with Michelson interferometer without control, are analyzed in terms amplitude response response. loop designed implemented, higher for very low frequency achieved. efficacy new approach demonstrated experimentally, showing that weak signal...
A high-performance fiber optic interferometric hydrophone based on a push-pull mandrel structure, with high sensitivity and wide-frequency response, is designed developed. Each arm of the Michelson interferometer coil wrapped onto separate but concentric thin elastic tube as sensing to detect acoustic pressure wave. The fabricated examined experimentally, demonstrating its capacity very low-frequency underwater variation. theoretical design validated results showing that has an average...
A seafloor seismic and tsunami monitoring system based on fiber optic interferometric technology was developed installed in the nearby waters at Chinese State Oceanic Administration's (SOA) Wuchang (Hainan Province, China) site. The tricomponent seismometer has a sensitivity of 57 dB (re: 0 = 1 rad/g), within operation frequency range 0.005-50 Hz, minimum detectable acceleration 43.4 ng/√(Hz); while water-level monitor an accuracy ±1 cm, measurement 0-110 m. been operating continuously since...
The influence of the parameters elastic mandrel on performance fiber-optic interferometric hydrophone with a push–pull structure comprised two concentric cylindrical shells is investigated through systematic solid mechanical analysis. structural and material considered include Young’s modulus, Poisson ratio, thickness, length, outer radius tube. result shows that higher sensitivity can be obtained lower modulus thinner wall, larger radius, longer length tube, accompanied by fundamental...
The phase noise of a Michelson interferometer-based fiber optic accelerometer is analyzed to determine the optimal modulation depth laser light frequency and length difference between interference arms. output intensity fluctuation interferometer, originating from modulated source, examined theoretically, revealing that both power interferometer are proportional arm difference. In addition, it determined experimentally linewidth, or equivalently, noise, varies approximate linearly with...
A methane optical sensing system using a single reflective polarization rotation gas cell is developed. The periodic ripple-like variation of interference light intensity in the common analyzed, terms calculated return loss and insertion cell. novel designed demonstrated to adequately suppress effect. efficacy new approach experimentally, showing that accuracy sensor better than by 47 %.