Shao Bin, Zhang Wei, Zhang Peng, Chen Weimin
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China.
Artificial Intelligence Center, Peng Cheng Laboratory, Shenzhen 518000, China.
Sensors (Basel). 2020 Dec 15;20(24):7178. doi: 10.3390/s20247178.
The Doppler effect of frequency-swept interferometry (FSI) is often seen as an obstacle to the dynamic ranging accuracy. However, the potential of this obstacle is rarely noticed and used. In this paper, by combining the periodical characteristics of the rotational Doppler effect, an FSI-based multi-parameter measurement method for the rotor is proposed. Through the establishment of the rotational Doppler formula of FSI, it is found that the frequency, direct component, and amplitude of the dynamic distance given by FSI can be utilized to estimate the angular velocity, axial clearance, and tilt angle of the rotor, respectively. A rotor platform and a fiber-optic FSI system were constructed, and a series of experiments were carried out to verify the proposed method. The experimental results showed that the relative errors of the measured axial clearance, angular velocity, and tilt angle were less than 3.5%. This work provides a new perspective on the multi-parameter measurement of the rotor and makes it possible to directly perform multi-parameter measurement inside the space-confined rotating machinery as only a single small-size fiber-optic probe is needed.
扫频干涉测量法（FSI）的多普勒效应通常被视为影响动态测距精度的一个障碍。然而，这一障碍的潜在价值却很少被注意和利用。本文通过结合旋转多普勒效应的周期性特征，提出了一种基于FSI的转子多参数测量方法。通过建立FSI的旋转多普勒公式，发现FSI给出的动态距离的频率、直流分量和幅度可分别用于估计转子的角速度、轴向间隙和倾斜角。搭建了转子平台和光纤FSI系统，并开展了一系列实验对所提方法进行验证。实验结果表明，测得的轴向间隙、角速度和倾斜角的相对误差均小于3.5%。这项工作为转子的多参数测量提供了新的视角，并且仅需一个小型光纤探头就能够直接在空间受限的旋转机械内部进行多参数测量。
