The introduction of a self-mixing (SM) displacement sensor into the measurement of mechanical vibration is an effective choice due to the characteristics of the SM interferometry (SMI). This is because the SMI has very favorable advantages for field measurement, for instance, high measurement accuracy, adaptability to any reflective surface, low cost, etc. Moreover, the compactness of SM sensors makes it easy to develop a hand-held portable device.
The key to developing a hand-held SM sensor is how to remove the hand-induced parasitic vibration. Since the removal of parasitic vibration is important for the accuracy of SMI, there have been many studies, divided into hardware-based and software-based methods.
Jang Kum Hyang, a researcher at the Institute of Mirae Industrial Technology, proposed a method of removing the hand-induced parasitic vibration based on data fitting, which is very simple and suitable for a hand-held self-mixing displacement sensor for the measurement of mechanical vibration.
The measurement accuracy that the proposed method provides is less than 30 nm.
If further information is needed, please refer to his paper “Removal of parasitic vibration in a self-mixing measurement for mechanical vibration based on data fitting” in “Applied optics” (SCI).