A dual-source distributed optical fiber sensor system with combined Raman and Brillouin scatterings is designed for simultaneous temperature and strain measurements.The optimal Raman and Brillouin signals can be separ...A dual-source distributed optical fiber sensor system with combined Raman and Brillouin scatterings is designed for simultaneous temperature and strain measurements.The optimal Raman and Brillouin signals can be separately obtained by adjusting the powers of the two sources using an optical switch.The temperature and strain can be determined by processing the optimal Raman and Brillouin signals.The experimental result shows that 1.7 ？C temperature resolution and 60-με strain resolution can be achieved at a 24.7-km distance.展开更多
An all-fiber optical laser pulse multi-pass stretcher using a chirped fiber Bragg grating （CFBG） is demon- strated. Pulses from a 1 053-nm mode-locked fiber seed oscillator are stretched by multiple passing through ...An all-fiber optical laser pulse multi-pass stretcher using a chirped fiber Bragg grating （CFBG） is demon- strated. Pulses from a 1 053-nm mode-locked fiber seed oscillator are stretched by multiple passing through a chirped fiber grating set in a fiber regenerative amplifier structure. We stretch the pulse from 16 ps to 1.855 ns after it transmits seven loops in the stretcher. The main factors that affect the stretching results are discussed.展开更多
A high-precision temperature-controlled narrow band-stop fiber Bragg grating （FBG） filter and light source self-calibration technique are proposed for application in the Brillouin optical time domain reflectometer ...A high-precision temperature-controlled narrow band-stop fiber Bragg grating （FBG） filter and light source self-calibration technique are proposed for application in the Brillouin optical time domain reflectometer （BOTDR） sensor system. With the proposed application, the BOTDR sensor system maintains good long-term stability and temperature precision through the reduction of the center wavelength drift in the FBG filters and corresponding decrease in the changes in light intensity. The experiment result shows that temperature precision of 1℃ and temperature stability of 0.7 ℃ can be achieved in a temperature sensor over a range of 8 km.展开更多
文摘A dual-source distributed optical fiber sensor system with combined Raman and Brillouin scatterings is designed for simultaneous temperature and strain measurements.The optimal Raman and Brillouin signals can be separately obtained by adjusting the powers of the two sources using an optical switch.The temperature and strain can be determined by processing the optimal Raman and Brillouin signals.The experimental result shows that 1.7 ？C temperature resolution and 60-με strain resolution can be achieved at a 24.7-km distance.
基金supported by the National Natural Science Foundation of China under Grant No.61205103
文摘An all-fiber optical laser pulse multi-pass stretcher using a chirped fiber Bragg grating （CFBG） is demon- strated. Pulses from a 1 053-nm mode-locked fiber seed oscillator are stretched by multiple passing through a chirped fiber grating set in a fiber regenerative amplifier structure. We stretch the pulse from 16 ps to 1.855 ns after it transmits seven loops in the stretcher. The main factors that affect the stretching results are discussed.
基金the support of the National Laboratory on High Power Laser and Physics
文摘A high-precision temperature-controlled narrow band-stop fiber Bragg grating （FBG） filter and light source self-calibration technique are proposed for application in the Brillouin optical time domain reflectometer （BOTDR） sensor system. With the proposed application, the BOTDR sensor system maintains good long-term stability and temperature precision through the reduction of the center wavelength drift in the FBG filters and corresponding decrease in the changes in light intensity. The experiment result shows that temperature precision of 1℃ and temperature stability of 0.7 ℃ can be achieved in a temperature sensor over a range of 8 km.
