Design of monitoring thickness and speed of cylindrical part based on laser self-mixing interference in a single-channel system during external grinding

Wu Sun; Zhuo Yang; Guo Feng; Zeqing Guo

doi:10.1117/12.2691325

1 August 2023 Design of monitoring thickness and speed of cylindrical part based on laser self-mixing interference in a single-channel system during external grinding

Wu Sun, Zhuo Yang, Guo Feng, Zeqing Guo

Author Affiliations +

Proceedings Volume 12752, Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023); 127520J (2023) https://doi.org/10.1117/12.2691325
Event: Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023), 2023, Hangzhou, China

Abstract

We design a simultaneous measurement of the thickness and speed to monitor mechanical cylindrical parts during external grinding based on a laser self-mixing interference in a single-channel system. If the wavelength is modulated via the laser-injecting-current to generate a frequency shifting corresponding to the rising- and falling- edge of the triangular modulated function. The Doppler frequency caused by the cylindrical part is split into rising- and falling- edge frequencies by the frequency shifting due to wavelength variations. The expressions of the measurement are derived via the derivative of the phase’s polynomial based on the emission-intensity expressions. The frequency shifting is related to the modulation function and the thickness of the cylindrical part. The rising- and falling- edge frequencies of the laser self-mixing interference obtained from the spectrum are used for calculating the Doppler frequency and the frequency shifting for estimating the thickness and the rotation speed of a cylindrical part during external grinding and the results show a good standard derivation less than 10⁻³ .

Citation Download Citation

Wu Sun, Zhuo Yang, Guo Feng, and Zeqing Guo "Design of monitoring thickness and speed of cylindrical part based on laser self-mixing interference in a single-channel system during external grinding", Proc. SPIE 12752, Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023), 127520J (1 August 2023); https://doi.org/10.1117/12.2691325

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KEYWORDS

Laser frequency

Modulation

Modulation frequency

Doppler effect

Design and modelling

Frequency modulation

Optical fibers

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