Vibration measurement based on multiple Hilbert transform for self-mixing interferometry

Zhang, Zihua; Li, Chengwei; Huang, Zhen

doi:10.1016/j.optcom.2018.12.032

Cited by 45 publications

(20 citation statements)

References 17 publications

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“…Such a method could represent a signal in its analytical form by performing a 90 • phase shift of the original signal over the orthogonal plane without modifying the amplitude, and the phase information is independent of the signal amplitude variations [24]. So far, HT has presented a good performance on SMI signals, as proven in many reports [25][26][27]. Herein, we employed the HT to unwrap the simultaneous external phase φ(t) and extract the fringe number correctly.…”

Section: Methodsmentioning

confidence: 99%

Micro Particle Sizing Using Hilbert Transform Time Domain Signal Analysis Method in Self-Mixing Interferometry

Zhao

Zhang

et al. 2019

Applied Sciences

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The present work envisages the development of a novel and low-cost self-mixing interferometry (SMI) technology-based single particle sensing system in a microchannel chip for real time single micro-scale particle sizing. We proposed a novel theoretical framework to describe the impulse SMI signal expression in the time domain induced by a flowing particle. Using Hilbert transform, the interferometric fringe number of the impulse SMI signal was retrieved precisely for particle size discrimination. For the ease of particle sensing, a hydrodynamic focusing microfluidic channel was employed by varying the flow rate ratio between the sample stream and the sheath liquid, and the particle stream of a controllable width was formed very easily. The experimental results presented good agreement with the theoretical values, providing a 300 nm resolution for the particle sizing measurement.

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Section: Methodsmentioning

confidence: 99%

Micro Particle Sizing Using Hilbert Transform Time Domain Signal Analysis Method in Self-Mixing Interferometry

Zhao

Zhang

et al. 2019

Applied Sciences

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“…In Figure 5 there were some ambiguities in the burst edge, the w value was difficult to measure directly. In order to extract w more precisely, we used the Hilbert transform (HT) thus retrieving the instantaneous phase information [31,38,39]. Figure 6b illustrated two 2π phase periods, clearly implying the beginning and ending time points of the individual particle-induced burst, of 0.76 ms duration (w) were measured from the phase oscillation.…”

Section: Size Classification Calibrationmentioning

confidence: 99%

Self-Mixing Interferometry-Based Micro Flow Cytometry System for Label-Free Cells Classification

et al. 2020

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In this paper, we present a novel optical microfluidic cytometry scheme for label-free detection of cells that is based on the self-mixing interferometry (SMI) technique. This device enables simple, fast and accurate detection of the individual cell characteristics and efficient cell type classification. We also propose a novel parameter to classify the cell or particle size. Artificial polystyrene beads and human living cells were measured using this system, and the SMI signal properties were statistically evaluated. The capability of the proposed cytometer for cell type discrimination and size classification has been validated by the measurement results. Our study can provide a very simple technique for cell enumeration and classification without any extra devices such as high-speed camera, photomultiplier and spectrometer. Moreover, the fluorescence staining operation which is necessary in traditional flow cytometry methods is not required either in our system.

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“…As shown in the typical SMI power equation in Eq. 7, P 0 and P are the direct and alternating components of the SMI signal, respectively, and φ F is the phase term under laser feedback [19], [20].…”

Section: B Simulation In Time Domainmentioning

confidence: 99%

Influence of Fluorescence to Photon Lifetime Ratio on Detection Sensitivity in Laser Self-Mixing Interferometry

2020

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Laser self-mixing interferometry (SMI) has been widely applied in the fields of precision measurement in scientific research, industry and biomedicine, and most researchers preferentially utilize laser diodes (LD) as light sources due to their compact structure and low cost. In most SMI cases, detection sensitivity rather than structure and cost is always the first concern. So in this article, we concentrate on an influencing factor on detection sensitivity named fluorescence to photon lifetime ratio (FPLR) which is an inherent parameter of the active material in a laser cavity. Derivation and simulation based on the time delayed rate equations are followed to validate the significant role played by the FPLR, then experiments according to different laser types including solid state lasers (SSL) and LDs are implemented to further prove the factor mentioned. Results demonstrate that SSLs always have higher detection sensitivity to feedback light than LDs, and is always more suitable to be applied in precision measurement. Additionally, the Yb:YAG laser is more sensitive than the Nd:YAG one. Increasing the pumping level from the threshold will decrease the SMI signal's sensitivity, and reducing laser feedback strength will also decrease the SMI signal's sensitivity. The findings from this article are beneficial to studying laser feedback sensitivity and selecting appropriate laser types in designing SMI sensors or instruments. Though with the disadvantages of large size and high cost, SSLs may be more suitable light sources in the field of high performance SMI sensing if miniaturization and cost are not the significant consideration. INDEX TERMS Laser self-mixing interferometry, fluorescence to photon lifetime ratio, sensitivity, solid state laser, laser diode.

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Vibration measurement based on multiple Hilbert transform for self-mixing interferometry

Cited by 45 publications

References 17 publications

Micro Particle Sizing Using Hilbert Transform Time Domain Signal Analysis Method in Self-Mixing Interferometry

Micro Particle Sizing Using Hilbert Transform Time Domain Signal Analysis Method in Self-Mixing Interferometry

Self-Mixing Interferometry-Based Micro Flow Cytometry System for Label-Free Cells Classification

Influence of Fluorescence to Photon Lifetime Ratio on Detection Sensitivity in Laser Self-Mixing Interferometry

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