Research / 2022 / Article / Fig 2

Research Article

Remote Measurement of the Angular Velocity Vector Based on Vectorial Doppler Effect Using Air-Core Optical Fiber

Figure 2

Experimental setup for the measurement of angular velocity vector remotely and robustly. (a) In the generation part, the Sagnac interferometer configuration is constructed to produce the stable and high-quality cylindrical vectorial polarization fields. In the transmission part, the vector light is coupled into a 1 km air-core fiber for transmission to the remote end (perturbation is to simulate the realistic test scenario). In the detection part, the emission of probe light and the collection of signal light are integrated on one platform for the detection of remote rotating target. In the signal processing part, Fourier analysis of the signals to extract the full angular velocity vector information; Col.: collimator; Pol.1, Pol.2, Pol.3: polarizer; PBS: polarization beam splitter; M1, M2, M3, M4: mirror; SPP: spiral phase plate; QWP: quarter-wave plate; OL1, OL2: objective lens; AP: aperture; BS: beam splitter; L1, L2: lens; PD1, PD2: photodetector; DMD: digital micromirror device. (b) The light field reconstruction records (the intensities and polarization distributions) of several typically generated vector beams before and after transmission through the air-core fiber in the experiment.