Abstract
In this paper, a novel method for simultaneous measurement of rotation speed and vibration based on self-mixing speckle interference (SMSI) has been demonstrated. In view of the autocorrelation characteristic of SMSI, the time delay of laser incident during one rotation period is determined, and the rotation speed of the object is calculated according to the mathematical relationship. At the same time, the signal square-wave conversion and the global maximum fringe-counting method are proposed to measure the vibration displacement subject to the rotation. The theory and signal processing means are introduced in detail, and a series of experiments employing computer disk at different positions with various rotation speeds indicate that the proposed method achieves a simple, efficient, and accurate multi-parameter measurement.
Highlights
IT is well-known that non-contact measurement of key parameters such as speed and vibration displacement are increasingly essential in microelectronics industry, quality control, and nondestructive testing applications
In 1999, K.Özdemir firstly proposed a method for measuring velocity and length of moving surfaces simultaneously by a speckle velocimeter [13]
We propose a novel method based on self-mixing speckle interference (SMSI) to measure the rotation speed and vibration of an object simultaneously
Summary
The velocity increase will correspondingly lead to higher requirement on the sampling frequency of the experimental equipment via Doppler velocity measurement method, which limits its application to some extent Another velocity measurement method by using self-mixing speckle interference (SMSI) overcame the above limitations and has attracted considerable research attention [23]. In 2018, Gao [24] et al proposed a rotation speed measurement method using a cross-correlation algorithm to analyze the dual-beam self-mixing speckle signal. This method does not need curve fitting to reckon the speed, and can achieve high-speed measurement at a low sampling rate with a relative error of less than 4%. The proposed method contributes to the non-contact testing of equipment and the quality control of products in industry, shows great application potential
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