Novel laser Doppler tachometer
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).
周健：College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
【1】H. Wu, C. Chen, C. Li and X. Wang. New method of speed measurement based on PSD. J. Electron. Meas. Instrum. 28, (2014).
【2】C. Chen, T. Ma, H. Jin, Y. Wu, Z. Hou and F. Li. Torque and rotational speed sensor based on resistance and capacitive grating for rotational shaft of mechanical systems. Mech. Syst. Signal Process. 142, (2020).
【3】H. Jin, Z. Sun, J. Gu, Y. Huang, X. Wang, Q. Zhang and X. Shen. A detrending-extracting-zooming-based speed measurement method for hermetic reciprocating compressor. Measurement. 157, (2020).
【4】Z. Zhou, R. Li and H. Li. Research on high precision measurement system of rotation rate. Meas. Control Technol. 19, (2000).
【5】L. Li, H. Hu and Y. Qin. Digital approach to rotational speed measurement using an electrostatic sensor. Sensors. 19, (2019).
【6】Q. Chen, L. Xue and H. Rao. Rotational speed measurement of ring spinning based on magnetic sensor. Meas. Sci. Technol. 28, (2017).
【7】J. Zhong, S. Zhong, Q. Zhang and Z. Peng. Measurement of instantaneous rotational speed using double-sine-varying-density fringe pattern. Mech. Syst. Sig. Process. 103, (2018).
【8】L. Wang, Y. Yan and K. Reda. Comparison of single and double electrostatic sensors for rotational speed measurement. Sens. Actuators A: Phys. 266, (2017).
【9】S. Wu, Y. Li, T. Lü, H. Chen, C. Yan, T. Wang and J. Guo. All-fiber pulsed laser Doppler vibrometer development based on time-domain chopping techniques. Chin. Opt. Lett. 17, (2019).
【10】Z. Kuang, L. Cheng, Y. Liang, H. Liang and B. Guan. Dual-polarization fiber grating laser-based laser Doppler velocimeter. Chin. Opt. Lett. 14, (2016).
【11】L. Liu, H. Zhang, J. Guo, H. Liu and S. Zhao. High precise measurement of target velocity using laser heterodyne technology. Opt. Precision Eng. 19, (2011).
【12】P. Xiao and J. Zhou. Application of referenced light laser Doppler velocimeter in rotation speed measurement of rotator. Chn. Sci. Technol. Inf. 18, (2012).
【13】B. Gao, C. Qing, H. Li, C. Jiang and P. Chen. Rotation speed measurement based on self-mixing speckle interference. Opt. Commun. 428, (2018).
【14】C. Qing, B. Gao, T. Dong, H. Li, S. Yin, C. Jiang and P. Chen. Rotation speed measurement based on self-mixing speckle autocorrelation spectrum. Optik. 208, (2019).
【15】S. HeS. He. The micro motor speed measuring system based on laser-Doppler effect. (2010).
【16】X. ShenX. Shen. Laser Doppler Velocimetry and Its Application. : Tsinghua University, (2004).
【17】J. Zhou and H. Huang. Application of frequency spectrum refinement and correction technology in laser Doppler velocimeter. Laser Inf. 40, (2010).
【18】X. Zhao, Y. Zhang, M. Huang, P. Hou, R. Zhu, J. Sun, X. Hou and W. Chen. Analysis of detection error for spot position in fiber nutation model. Chin. Opt. Lett. 18, (2020).
【19】H. Zhang, Y. Chen, T. Gen, J. Wu and T. Chen. Study on main factors affecting position detection accuracy of four-quadrant detector. Chin. J. Lasers. 42, (2015).
【20】J. ZhouJ. Zhou. Preliminary study on laser Doppler velocimeter for vehicle self-contained navigation. (2011).
Wentao Li, Jian Zhou, "Novel laser Doppler tachometer," Chinese Optics Letters 19(1), 011201 (2021)