Abstract
In this paper, we propose and experimentally demonstrate a three-dimensional (3D) microscopic system that reconstructs a 3D image based on structured light illumination. The spatial pattern of the structured light changes according to the profile of the object, and by measuring the change, a 3D image of the object is reconstructed. The structured light is generated with a digital micro-mirror device (DMD), which controls the structured light pattern to change in a kHz rate and enables the system to record the 3D information in real time. The working distance of the imaging system is 9 cm at a resolution of 20 μm. The resolution, working distance, and real-time 3D imaging enable the system to be applied in bridge and road crack examinations, and structure fault detection of transportation infrastructures.
Highlights
Three-dimensional (3D) microscopic imaging is a key tool for structure fault detection and analysis of the material degradation in transportation infrastructures [1,2]
The principle of 3D imaging based on structured light illumination is to calculate the depth information by observing the deformation caused by the uneven surface of the object
We proposed and experimentally demonstrated a 3D microscopic image reconstruction method based on structured light illumination
Summary
Three-dimensional (3D) microscopic imaging is a key tool for structure fault detection and analysis of the material degradation in transportation infrastructures [1,2]. The 3D test results provide valuable information of transportation infrastructure, such as the depth and width of a crack, and the volume of an abnormal protrusion [3,4]. The 3D microscopic systems have been widely studied and achieve a high lateral resolution (hereinafter referred to as resolution). The high resolution is ideal for a lab test, whereas for a field test in the transformation system, the test speed becomes the major factor to be considered. The long imaging time requires the sample to be held stable during the imaging process, which is not ideal for field tests
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