Rotation speed measurement based on self-mixing speckle autocorrelation spectrum

Chen, Qing; Gao, Bingkun; Dong, Taiji; Li, Haoran; Yin, Shi; Jiang, Chunlei; Chen, Peng

doi:10.1016/j.ijleo.2019.164117

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Laser self-mixing interferometry (SMI) is an emerging non-contact measurement technology which has been extensively researched. Owing to its intrinsic feature of simplicity, compactness, and easy collimation, SMI has been widely applied in various fields, such as displacement [1,2], vibration [3][4][5], velocity [6,7], angle [8,9], tomography [10], and biomedical signal [11] measurements. In the typical SMI systems, the fringe-counting method is usually used to quickly demodulate the displacement of the vibration.…”

Section: Introductionmentioning

confidence: 99%

Laser Self-Mixing Interferometer Based on Multiple Reflections and Phase-Modulation Technique

Wang

Zhu

et al. 2022

Photonics

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An improved method combining multiple reflections with the phase-modulation technique (MR-PM) is proposed to construct a self-mixing interferometer with high accuracy. The phase modulation is performed by using an electro-optic modulator that is placed in the external cavity. To broaden the harmonic components spectrum of the self-mixing signal, the multiple-reflection technique is employed. By extracting orthogonal signals from the spectrum, phase demodulation is implemented to realize displacement reconstruction. The principle and signal processing approach are described in detail. A series of simulations and experiments indicate that the measurement accuracy of the system can be effectively improved with the increase in reflection times. The vibration with an amplitude of 44 nm has been proved to be measurable with a reconstruction error less than 3 nm. Due to the advantages of high accuracy and broad measurement range, the proposed method will play a significant role in the field of non-contact nanometer vibration measurement.

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Section: Introductionmentioning

confidence: 99%

Laser Self-Mixing Interferometer Based on Multiple Reflections and Phase-Modulation Technique

Wang

Zhu

et al. 2022

Photonics

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“…As a non-contact measurement method, laser Doppler technology can avoid the abovementioned shortcomings, and it has been widely used [9,10] . Scholars at home and abroad have proposed a variety of laser Doppler velocity measurement models, such as the laser heterodyne detection technology with the relative error of 0.5% [11] , the reference beam laser Doppler velocity measuring system with that of 0.4% [12] , the self-mixing speckle spectrum analysis method with that of 2% [13,14] , and the dual-beam differential Doppler velocity measuring technology with that of 1.1% [15] . However, these methods can only obtain the linear velocity of the measured point directly, and then the radius of the object must be measured to further calculate the rotational speed.…”

Section: Introductionmentioning

confidence: 99%

Novel laser Doppler tachometer

Jing-lun

2021

中国光学快报

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In order to improve the accuracy and universality of the rotational speed measurement, an instantaneous rotational speed measurement method based on laser Doppler technology is proposed. The composition and working principle of the new system are discussed in detail. Theoretical and experimental results show that the new rotational speed measurement system belongs to the non-contact method, which eliminates the quantization error of the contact method and greatly improves the applicability and accuracy. Compared to the commonly used method, the measurement accuracy of the new rotational speed measurement system will not be affected by the system's installation angle deviation, and it does not need to measure the radius of the rotating body, so the influence of the radius fluctuation of the rotating body on the measurement accuracy can be avoided while outputting the rotational speed in real time. The relative error of the rotational speed measurement is less than 0.06% (1σ).

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Rotation speed measurement based on self-mixing speckle autocorrelation spectrum

Cited by 2 publications

References 18 publications

Laser Self-Mixing Interferometer Based on Multiple Reflections and Phase-Modulation Technique

Laser Self-Mixing Interferometer Based on Multiple Reflections and Phase-Modulation Technique

Novel laser Doppler tachometer

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