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赵勇, Zhao Yong, Zhang Ya-Nan, Wu Di, Wang Qi
IEEE Journal of Lightwave Technology,-0001,():
-1年11月30日
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【期刊论文】High Sensitivity Gas Sensing method Based on Slow Light in Photonic Crystal Waveguide
赵勇, Zhao Yong, Zhang Ya-nan, Wang Qi
Sensors and Actuators B:Chemical,-0001,():
-1年11月30日
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赵勇, Yong Zhao, Mingguo Zhao, Jian Yang
Optical Engineering 44(2005)014401(1-5),-0001,():
-1年11月30日
High-pressure measurement is made by demodulating Bragg grating peak splitting caused by transverse stress differences in the core of a high-birefringence (HB) single-mode fiber, which is bonded on the exterior surface of a free active element bulk modulus. The two orthogonally polarized signals reflected from the HB fiber Bragg grating (FBG) can be independently detected with a simple FBG interrogation system, which is based on the light intensity measurement method. In addition, the cross-sensitivity of the FBG sensor can be self-compensated by this method. The measurement principle is introduced, and preliminary experimental results indicate that the measurement sensitivity is estimated to be~12 pm/N in a linear measurement range from 0 to 120 N.
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【期刊论文】Discrimination methods and demodulation techniques for fiber Bragg grating sensors
赵勇, Yong Zhao*, Yanbiao Liao
Optics and lasers in Engineering 41(2004)1-18,-0001,():
-1年11月30日
Fiber Bragg grating (FBG) sensors are one of the most exciting developments in the fields of fiber-optic sensors in recent years. One of the problems in using grating sensors is the discrimination of temperature and strain responses (cross-sensitivity effect between temperature and strain), because in most real-world applications both of these quantities will be acting on the sensor elements. Another problem is how to measure a small Bragg wavelength shift accurately. This article presents a comprehensive and systematic overview of discrimination measurement methods and demodulation techniques for FBG sensors. It is anticipated that FBG sensors will be commercialized and widely applied in practice in the near future due to the maturity of economical production of FBGs and the availability of cost effective measurement and demodulation techniques. Recent research work about a differential FBG sensor for simultaneous measurement of down-hole high pressure and temperature and the corresponding demodulation techniques are also introduced in this paper.
Fiber Bragg grating, Fiber-optic sensor, Temperature measurement, Demodulation technique, Cross-sensitivity effect
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【期刊论文】Fiber-Optic Temperature Sensor Used for Oil Well Based on Semiconductor Optical Absorption
赵勇, Yong Zhao, Min Rong, and Yanbiao Liao
IEEE SENSORS JOURNAL 3(2003)400-403,-0001,():
-1年11月30日
This paper describes an optical-fiber sensor developed for temperature measurement under the offshore oil well conditions. The sensor exploits the displacement of the optical absorption edge occurring in semiconductors under the influence of temperature variation as a result of temperature-induced energy shifting of conduction band extrema. The structure of the sensor and the measurement principle are described. The common-path reference measurement and node type error compensation technologies are developed. And the detailed theoretical analysis indicates that the proposed sensor system can effectively improve measurement errors caused by light fluctuation, difference and variation of the detector responsiveness, circuit magnification times, and so on. It approves that this sensor system can be applied under the long-term formidable conditions with fairly good measurement stability.
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