Dual-polarization fiber grating laser-based laser Doppler velocimeter

• 作 者: 匡泽远 程凌浩 梁贻智 梁浩 关柏鸥
• 机 构: Institute of Photonics Technology,Jinan University,
• 出 处: Chinese Optics Letters
• 发表日期: 2016年05期
• 关键词: grating demodulation capable photodetector reflected outputs linearly rotation p

A dual-frequency laser Doppler velocimeter implemented by a dual-polarization fiber grating laser is proposed,with the two laser frequencies produced by the two orthogonally polarized laser outputs of the fiber grating laser.The reflected laser outputs from a moving target experience the Doppler frequency shift,which is shown to be linearly related to the velocity and the beat note frequency difference between the laser outputs and the reflected light. With a digital frequency demodulation scheme,a high sensitivity of 0.64 MHz/(m/s) and a velocity resolution of less than 0.5% of the velocity for velocity measurement are demonstrated,which shows that the proposed laser Doppler velocimeter is capable of measurement of wide range of velocity.

A dual-frequency laser Doppler velocimeter implemented by a dual-polarization fiber grating laser is proposed, with the two laser frequencies produced by the two orthogonally polarized laser outputs of the fiber grating laser. The laser output from a moving target experience the Doppler frequency shift, which is shown to be linearly related to the velocity and the beat note frequency difference between the laser outputs and the reflected light. With a digital frequency demodulation scheme, a high sensitivity of 0.64 MHz / (m / s) and a velocity resolution of less than 0.5% of the velocity for velocity measurement are demonstrated, which shows that the proposed laser Doppler velocimeter is capable of measurement of wide range of velocity.