Fiber-Optic Anemometer Based on Distributed Bragg Reflector Fiber Laser Technology

We present a novel fiber-optic anemometer based on a distributed Bragg reflector (DBR) fiber laser. The anemometer consists of a fiber laser pressure sensing element and a Venturi tube designed to convert the wind velocity into differential gas pressure that can be measured by the fiber-laser sensor. A DBR fiber laser that has two polarization modes is designed and fabricated as the major sensing element in this anemometer. The fiber-laser sensor is demodulated by the beat frequency of the two polarization modes, which has higher sensitivity and lower cost over wavelength-demodulated fiber-laser sensors. The experimental results show that the sensor's response to wind velocity is quadratic in the measurement range of 8 ~ 40 m/s, the short term repeatability is better than 0.5%, and its sensitivity is impacted by the power of pump laser. Additionally, this anemometer has the potential capability to be used as a flow meter for both gas and liquid flows.

[1]  O. Frazão,et al.  Optical inclinometer based on a single long-period fiber grating combined with a fused taper. , 2006, Optics letters.

[2]  Jian Jiang,et al.  A Passive Optical Fiber Anemometer for Wind Speed Measurement on High-Voltage Overhead Transmission Lines , 2012, IEEE Transactions on Instrumentation and Measurement.

[3]  Cheng-Ling Lee,et al.  Directional anemometer based on an anisotropic flat-clad tapered fiber Michelson interferometer , 2012 .

[4]  Hwa-Yaw Tam,et al.  High-Resolution Strain and Temperature Sensor Based on Distributed Bragg Reflector Fiber Laser , 2007, IEEE Photonics Technology Letters.

[5]  Bai-Ou Guan,et al.  Distributed bragg-reflector fiber-laser sensor for lateral force measurement , 2007, 2007 Asia Optical Fiber Communication and Optoelectronics Conference.

[6]  Hiroaki Niitsuma,et al.  A water flowmeter using dual fiber Bragg grating sensors and cross-correlation technique , 2004 .

[7]  E. Valdaytseva,et al.  Simulation and Technology of Hybrid Welding of Thick Steel Parts with High Power Fiber Laser , 2011 .

[8]  S. Rashleigh Origins and control of polarization effects in single-mode fibers (A) , 1982 .

[9]  H. J. Shaw,et al.  Fibre gyro experiment using fibre laser source , 1989 .

[10]  Bing Qi,et al.  Self-compensating fiber optic flow sensor system and its field applications. , 2004, Applied optics.

[11]  Ching-Jer Huang,et al.  Calibration and Deployment of a Fiber-Optic Sensing System for Monitoring Debris Flows , 2012, Sensors.

[12]  R. J. Goldstein,et al.  Fluid Mechanics Measurements , 1983 .

[13]  Wei Peng,et al.  Fiber-Optic Anemometer Based on Distributed Bragg Reflector Fiber Laser Technology , 2012, IEEE Photonics Technology Letters.

[14]  K.P. Chen,et al.  Fiber Bragg grating flow sensors powered by in-fiber light , 2005, IEEE Sensors Journal.

[15]  Botao Zhang,et al.  Distributed flow sensing using optical hot -wire grid. , 2012, Optics express.

[16]  H. Tam,et al.  All-optical fiber anemometer based on laser heated fiber Bragg gratings. , 2011, Optics express.

[17]  J. Elsner,et al.  The increasing intensity of the strongest tropical cyclones , 2008, Nature.

[18]  Fu Wei Sun,et al.  Effect of Wind Speed to Water Mist in Coal Mine Laneway , 2011 .