Sweep frequency polarization modulation-based rotor and stator axial clearance online measurement device and method

• Main Authors: NIU GUANGYUE, JIANG JIAJIA, DUAN FAJIE, YU ZHENXIN, FU XIAO, BAO RUIJIA
• Format: Patent
• Language: Chinese; English
• Published: 08.11.2022
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The invention discloses a rotor and stator axial clearance online measurement device and method based on frequency sweep polarization modulation. The measurement device comprises a secondary modulation light path unit, a measurement light path unit, a reference light path unit, a frequency sweep signal generation unit and a signal acquisition and processing unit. The secondary modulation light path unit is connected with the measurement light path unit and the reference light path unit, the secondary modulation light path unit comprises a laser, a first collimator, an isolator, a polarization splitting prism, an electro-optical modulator, a 1/4 wave plate, a second collimator and a coupler, and the laser is connected with the first collimator through a single-mode optical fiber; the coupler is connected with the second collimator through a polarization maintaining optical fiber; an isolator, a polarization splitting prism, an electro-optical modulator, a 1/4 wave plate and a second collimator are sequentially