Self-mixing interference vibration measurement based on even equivalent wavelength Fourier transform algorithm under weak feedback regime

Li, Dongyu; Zhang, Zhenghe; Huang, Zan; Wang, Xiaohui; Zhang, Zihua; Huang, Zhen

doi:10.1117/1.oe.59.7.074101

Cited by 7 publications

(1 citation statement)

References 33 publications

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“…In addition, self-mixing interferometry (SMI) is a powerful tool for displacement measurements [34]. Extensive research has been conducted on optical path optimisation [35] and algorithm improvement [36,37]; thus, the resolution can be enhanced to the nanoscale. However, its application is hampered by its high cost and complex signal-processing requirements.…”

Section: Introductionmentioning

confidence: 99%

The trajectory monitoring method of hydrodynamic suspension bearing based on laser-ranging technology

Xing

Hong

Xue

et al. 2023

Meas. Sci. Technol.

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Rotor trajectory monitoring, essential for the stability assessment and trouble diagnosis of rotating machines, has attracted extensive attention for a long time. Nevertheless, in the case of hydrodynamic suspension micropumps, whose rotating components are wrapped in motor windings with strong electromagnetic interference, it is challenging to monitor the trajectory of the rotor, and a contactless measurement scheme is yet to be developed. In this study, we proposed a promising approach to obtain the centre location of the rotor of a hydrodynamic suspension micropump based on laser displacement sensors and built a test bench. Through experiments at multiple rotating speeds, the rotor's displacement and velocity variations in two orthogonal directions, as well as the trajectories of the rotor, were captured and analysed, making the evaluation of the rotor's operational stability feasible. We reveal an improvement in suspension stability by increasing the rotating speed and elaborating on the corresponding mechanism. Simultaneously, the experimental results show that the proposed method can achieve less than 1.3 % relative uncertainty. In this study, we allow for high-precision contactless anti-jamming rotor trajectory monitoring at the microscale and in electromagnetically variable situations.

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