Abstract
Research on optimal markers for infrared imaging and differences in their characteristics in the presence of heat sources has not yet been performed. This study investigates optimal material combinations for developing an accurate and detachable infrared marker for multiple conditions in the medium wave infrared (MWIR) region. Based on four requirements, 11 material combinations are systematically evaluated. Consequently, the optimal marker differs in relation to the presence of specular reflection components. Metal–insulator markers are suitable under non-heating and hot-air heating conditions without reflection components, although a printed marker made of copier paper is captured more clearly than metal–insulator markers during heating, using an optical radiation heating source with reflection components. Our findings can be applied in structural health monitoring and multi-modal projection involving heat sources.
Highlights
Infrared imaging with a thermography camera has been widely utilized for various applications, including multi-modal imaging and structural health monitoring [1,2,3,4]
This study investigated optimal material combinations for producing infrared markers under non-heating and heating conditions through two experiments in the medium wave infrared (MWIR) region
Markers composed of Japanese paper tape and metal foil were most suitable for MWIR imaging under non-heating conditions
Summary
Infrared imaging with a thermography camera has been widely utilized for various applications, including multi-modal imaging and structural health monitoring [1,2,3,4] For these applications, infrared markers play an essential role in device calibration and evaluation. Using a thermal lamp [11,12], the difference in the heat absorption coefficient between white and black surfaces was ascertained It works with copier paper, this marker could only be used under heating conditions [1]. Markers that can be used without heating sources have been developed using metal– insulator boards [6,13,14,15], wire grids [5,16], and aluminum or wood plates with open slits [17,18] These markers take advantage of the differences in reflectivity in the infrared region between insulators, metals, and voids. It is possible to construct markers using a device that converts electricity into heat, including electrical resistors [19], light bulbs [20,21,22], and small circular thermostatic heaters [23]
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