Inspection of Metal and Concrete Specimens Using Imaging System with Laser Displacement Sensor

Abstract

Flaws such as cracks and impact damages initially occur on the surface of the infrastructure materials and propagate internally causing further degradation. These infrastructure materials have different physical and chemical composition and have different geometric shapes, which can mask the indication of minute surface flaws. There is a need to develop systems that can detect these surface flaws irrespective of their properties and shapes. We propose an imaging system capable of interrogating plain and non-plain structures for the purpose of detection and evaluation of surface flaws such as cracks and impact damages using a laser displacement sensor (LDS). The developed system consists of LDS mounted on the scanner, which is capable of raster scanning over the material under test. The reading of displacement from the sensor head to the laser spot on the surface of the test material is then used to generate two-dimensional (2-D) images in real time, which can be used to detect minute surface flaws. This paper presents the results of inspection of metal and concrete test specimens. 2-D images through the cut of the metal profile are also generated to demonstrate the ability of a system to image interior structure.

Displacement Measurement Method Based on the Rotating Paraboloid Array

“…There is a mathematical approximation caused by the principle of autocollimation in an optical slope sensor due to Equation (6). When the opening size of the rotating paraboloid was 2 mm, the corresponding maximum slope was 0.1767 rad.…”

“…Ultra-precision displacement measurement technology has become a research focus in the field of measurement technology [1][2][3]. Displacement measurement methods have a wide range of application requirements in different fields, such as structural health monitoring [4,5], civil engineering [6][7][8], and manufacturing industries [9,10]. In particular, with the development of science and technology, the demand for precision displacement measurement technology has increased in precision instrument manufacturing, precision machine tools, and precision movement platforms [11,12].…”

Application of negative Poisson’s ratio honeycomb structure in force measurement

“…The current issue and full text archive of this journal is available on Emerald Insight at: https://www.emerald.com/insight/0260-2288.htm monitoring (Yang and Oyadiji, 2016), civil engineering (Giri et al, 2017;Giri and Kharkovsky, 2018) and manufacturing industries (Lu et al, 2018;Dong et al, 2018). However, most the force measuring methods are sensitive to environmental interference, high cost and complex instrument adjustments.…”

Dimension Measurement and Key Point Detection of Boxes through Laser-Triangulation and Deep Learning-Based Techniques

“…This technology has the characteristics of noncontact, wide range, high flexibility, fast speed, high precision, stable algorithms, simple structure, and good anti-interference. Moreover, the sensor is simple, economical, and easy to implement; thus, this technology has been widely used in many industrial fields, such as 3D shape measurement [12,13], vision navigation [10], quality control [14][15][16][17], and automatic inspection [18]. Some outstanding applications have used this technology in different fields.…”