In a gathering,some so-called successful businessmen are talking happily.Among them is a famous chemical fiber manufacturer Chen Jianhua.Chen recalled his past in his memoir "My Endeavor"-"I was born in...In a gathering,some so-called successful businessmen are talking happily.Among them is a famous chemical fiber manufacturer Chen Jianhua.Chen recalled his past in his memoir "My Endeavor"-"I was born in a remote town Shengze in 1971, suffering an impoverished life when I was very young.My family is hard to afford tuition fee when I was a pupil,…."But a hero is known in the time of misfortune,Chen owns a total asset of 13 billion Yuan at this moment with his unremitting efforts year by year,mastering a kingdom of chemical fiber-Hengli Group..As an old saying goes "Suffering is wealth",the early experience steeled Chen,endowing the wealth and fortitude to him. After skimming over Chen's memoir,I continued a further face to face interview with him in order to understand his course of struggle more deeply.All the success have their own highlights in their characters,therefore,we cannot make an exception of Chen's case.展开更多
A novel fiber Bragg grating （FBG） sensor array system based on digital phase generated carrier （PGC） demodulation and reference compensation method is proposed and set up. Experimental results confirm that the dig...A novel fiber Bragg grating （FBG） sensor array system based on digital phase generated carrier （PGC） demodulation and reference compensation method is proposed and set up. Experimental results confirm that the digital PGC demodulation can be used for wavelength-division-multiplexed FBG sensor array and the reference compensation method can reduce the environmental interference by approximately 40 dB in the frequency range from 20 Hz to 2 kHz. The minimum detectable wavelength-shift of the sensor system is 1 × 10^-3 pm/Hz^1/2.展开更多
A distributed feedback fiber laser （DFB FL） sensor system with ultra-high resolution is described. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs ...A distributed feedback fiber laser （DFB FL） sensor system with ultra-high resolution is described. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced to achieve ultra-high resolution interrogation. A detailed noise analysis of the system is presented, and it is shown that the system resolution is limited by the frequency noise of the DFB FL.展开更多
文摘In a gathering,some so-called successful businessmen are talking happily.Among them is a famous chemical fiber manufacturer Chen Jianhua.Chen recalled his past in his memoir "My Endeavor"-"I was born in a remote town Shengze in 1971, suffering an impoverished life when I was very young.My family is hard to afford tuition fee when I was a pupil,…."But a hero is known in the time of misfortune,Chen owns a total asset of 13 billion Yuan at this moment with his unremitting efforts year by year,mastering a kingdom of chemical fiber-Hengli Group..As an old saying goes "Suffering is wealth",the early experience steeled Chen,endowing the wealth and fortitude to him. After skimming over Chen's memoir,I continued a further face to face interview with him in order to understand his course of struggle more deeply.All the success have their own highlights in their characters,therefore,we cannot make an exception of Chen's case.
基金supported by the National 863 Program under Grant No. 2007AA03Z415.
文摘A novel fiber Bragg grating （FBG） sensor array system based on digital phase generated carrier （PGC） demodulation and reference compensation method is proposed and set up. Experimental results confirm that the digital PGC demodulation can be used for wavelength-division-multiplexed FBG sensor array and the reference compensation method can reduce the environmental interference by approximately 40 dB in the frequency range from 20 Hz to 2 kHz. The minimum detectable wavelength-shift of the sensor system is 1 × 10^-3 pm/Hz^1/2.
基金supported by the National 863 Projects under Grant No. 2007AA03Z415.
文摘A distributed feedback fiber laser （DFB FL） sensor system with ultra-high resolution is described. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced to achieve ultra-high resolution interrogation. A detailed noise analysis of the system is presented, and it is shown that the system resolution is limited by the frequency noise of the DFB FL.
