A novel flow velocity sensor based on chirped fiber Bragg grating

作者：Yang Shu Lian^*; Sheng Cui Xia; Wei Qin Qin; He Jian Ting; Su Yuan Bin; Shen Jin

来源：Journal of Optoelectronics - Laser, 2013, 24(9): 1683-1687.

• Chirped fiber Bragg grating
• Chirped fiber grating
• Intensity-modulated
• Measurement range
• Pressure sensing
• Reflection spectra
• Sensor systems
• Velocity sensor

A novel flow velocity sensor based on a chirped fiber Bragg grating (CFBG) that includes the chirped fiber grating pressure sensing setup and Venturi tube has been proposed, aiming to increase the size and reduce the cost of the sensor system. The CFBG-based intensity-modulated sensor shows the potential applications in various sensing areas due to their many advantages. The relationship between the flow velocity and the bandwidth of the reflection spectrum of the chirped fiber Bragg grating is derived. The deformation of the rectangular cantilever beam is caused by the pressure on two sides of the cross section of the aluminum foil tube in the pressure sensing setup, and it results in the bandwidth change of the reflection spectrum of the chirped fiber Bragg grating that is mounted at the side of the cantilever. The flow velocity can be obtained by measuring the bandwidth of the reflection spectrum of the chirped fiber Bragg grating, which is not sensitive to the temperature. The experimental results verify the feasibility of the proposed sensor with a measurement range from 8 to 100 mm/s.

• 出版日期2013
• 单位山东大学