Spot size-based laser vibrometer using an advanced image sensor for structural health monitoring

Abstract

Failure-induced vibrations are a common phenomenon in many civil structures, and the characterization of their vibration frequencies is crucial for monitoring their structural health. This paper presents a new optics-based mechanical system that can monitor the vibrations of civil structures through the fluctuation of laser spot size using advanced image sensors. The principle behind this vibrometer combines mechanical oscillation and laser optics, and it provides information on vibration through the precise variation of spot size in a low-cost, low-risk, and high-speed manner. The system comprises simple components that are easily integrated into various civil structures. Therefore, this novel approach offers a promising method for effectively monitoring the health of civil structures.