Viaxl: A Solution of a Low-Cost Real-Time Visual Accelerometer Based on Laser Speckle Optical Flow Detection

Abstract

Non-contact and non-destructive acceleration measurement is receiving considerable attention due to their low cost, flexibility, and simplicity of implementation, as well as their excellent performance in some emerging applications such as medical electronics applications, vibration monitoring, and some other special scenarios. In this paper, a visual accelerometer system based on laser speckle optical flow detection named Viaxl is proposed. Compared with the conventional non-contact acceleration measurement method based on a laser system, Viaxl has moderate and stable performance with the advantages of low cost and simplicity of implementation. Experiment results demonstrate that Viaxl, which consists of a commercial camera and a low-cost laser pointer, can achieve real-time, non-contact acceleration measurement, and confirm the basic system performance of Viaxl: a measurement nonlinearity better than 1.3%, up to 31 dB signal-to-noise ratio, and 1150 Hz theoretic bandwidth; this demonstrates the huge potential of Viaxl in a wide range of applications, and provides a new possible technical method for non-contact acceleration detection.

The 20k Samples-Per-Second Real Time Detection of Acoustic Vibration Based on Displacement Estimation of One-Dimensional Laser Speckle Images

“…The optical vibrometers can accurately measure sub-wavelength mechanical vibrations without contacting objects. These characteristics allow the technology to have broad application prospects in various fields, such as optical microphone [ 1 , 2 , 3 ], surveillance of audio signal in rescue [ 4 , 5 , 6 ], visual accelerometer [ 7 ], and so on.…”

Modeling and Analysis of a SiC Microstructure-Based Capacitive Micro-Accelerometer

“…In the 1980s, micro-accelerometers were made using integrated circuits (ICs) and micromachining, which gave them the advantages of small volume [ 5 ], light weight [ 6 ], low power consumption [ 7 ], low cost [ 8 ], easy integration [ 9 ], strong overload capacity [ 10 ], and mass production [ 11 ]. These not only became the core components of micro-inertial measurement units (MIMUs) [ 12 ] but also rapidly expanded into other civil fields [ 13 , 14 ].…”