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Temperature is an important monitoring parameter for applications in aviation industry. We have developed a series of optical fiber temperature sensors to fulfil the different requirements based on interference, including the pressure-based optical fiber temperature sensor with the capability of being integrated with optical fiber MEMS pressure sensor, micro-interferometer-based optical fiber medium...
Fiber laser intracavity gas sensor has advantages of high sensitivity and wide wavelength coverage. We present our recent research progress on intracavity gas sensor including the modular structure design and the general procedure of signal processing. The methods of wavelength-sweep-based multiline averaging and attenuator-based cavity loss increment are used to enhance the gas sensor's stability...
An intelligent video surveillance system was proposed together with distributed fiber vibration sensing technique and advanced intelligent identification algorithm, in order to monitor all kinds of real-time disturbance and intrusion on the cable.
To improve the reliability that are very important for large-scale and long range all optical fiber sensor networks, monitoring optical fiber sensor networks is necessary. We proposed a novel method for monitoring optical fiber sensor networks using optical frequency-domain reflectometry (OFDR) which provides a narrow spatial resolution that enables us to locate closely separated reflection and discrete...
Wavelength sweep technique (WST) is introduced into intra-cavity fiber laser (ICFL) for low concentration gas detection. The limitation induced by noise can be eliminated using this method, and the performance of the system is improved. The sensitivity of the system is reduced to less than 300 ppm. With WST, sweeping characteristic of the ICFL can be described according to known gas absorption spectra.
Wavelength modulation technique (WMT) and wavelength sweep technique (WST) are introduced into intra-cavity absorption gas sensors (ICAGS) for low concentration gas detection. The optimized parameters of the system maximizing the signal-to-noise ratio (SNR) are found. Calibration of acetylene concentration and gas recognition are both realized.
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