Abstract
In this work, a 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating and then cooling of each sample after lasers are switched off. The data is then analyzed using FLIR proprietary software. Since the absorption spectra of materials are unique, using multiple lasers of different wavelengths to simultaneously shine onto the sample at different locations would give enough thermal data to successfully characterize the samples within a reasonable amount of time. The results are very promising for applications involving non-destructive detection and classification of materials.
Highlights
In the construction industry, infrared thermography (IRT) is one of the valuable techniques for estimating the thermal transmittance (U-value) of buildings and evaluation of energy efficiency of existing buildings [1]-[6], thermal performances of insulating glasses [7], identification of cracks and defects [8] [9], air leakage [10], the density of construction materials [11], and quality control of building materials [6]
A 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating and cooling of each sample after lasers are switched off
A 532 nm, 100 mW diode laser was shined onto each sample for about 10 s while thermal measurements were taken using an FLIR T-540 camera in video capture mode
Summary
In the construction industry, infrared thermography (IRT) is one of the valuable techniques for estimating the thermal transmittance (U-value) of buildings and evaluation of energy efficiency of existing buildings [1]-[6], thermal performances of insulating glasses (glazing) [7], identification of cracks and defects [8] [9], air leakage [10], the density of construction materials [11], and quality control of building materials [6]. Measurement of the U-value of existing buildings enables quantitative measurement and evaluation of the building envelopes’ energy efficiency and performance [1] [2] [3]. D. Gonzalez-Aguilera [3] demonstrated a 3D-IR image-based thermographic modeling approach to evaluate the energy efficiency of the building envelope. The study used building facades composed of brick and concrete and double glass aluminum frame windows
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