Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry
Yuru Chen,
Xiaohua Lei,
Lin Xiao,
Peng Zhang,
Xianming Liu
Affiliations
Yuru Chen
The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Xiaohua Lei
The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Lin Xiao
The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Peng Zhang
The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Xianming Liu
The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
To improve the precision of dynamic distance measurement based on the frequency-swept interferometry (FSI) system, a Doppler-induced error compensation model based on a scheme increasing the frequency sweeping rate is proposed. A distance demodulation method based on a Fourier transformation is investigated when the defined quasi-stationary coefficient approaches a constant. Simulations and experiments based on dynamic distance with a sinusoidal change demonstrate that the proposed method has a standard deviation of 0.09 μm within a distance range of 4 μm at a sweeping rate of 60 KHz.
