Methodology for measuring the gap size using a fiber-optic displacement sensor exemplified by a centrifugal blood pump

Gawlikowski, M.; Kurtyka, Przemysław; Zalewski, Jerzy; Zarwańska-Doffek, Magda; Kapis, Artur

doi:10.4302/plp.v12i2.1017

Cited by 1 publication

(2 citation statements)

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“…Consequently, the applications of optical sensors have flourished in displacement measurements. For example, a fibre-optic displacement sensor measured the impeller displacement of a blood pump with a low absolute error of ±3.2 µm [33]. However, we cannot apply this type of sensor to our micropump because the spot diameter can exceed 1 mm, which is too large compared to the impeller hub.…”

Section: Introductionmentioning

confidence: 99%

“…However, measurement instability is a concern because dispersion, multiple refractions, and reflections may weaken the monochromatic light signal. In addition, concerning methodology, these studies focused on motion capture in only one direction [33,38]; thus, an efficient scheme for two-dimensional trajectory measurement needs to be further developed. Alternatively, lasers with monochromatic characteristics, high brightness, and directionality have been widely used in various fields, such as industrial production and scientific research.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%