Rugometric and Microtopographic Inspection of Cr–Cr₂O₃Cermet Solar Absorbers

Abstract

The development of new efficient and cost effective solar energy collectors and converters either quantum or thermal attracts great attention and effort in a number of research laboratories all over the world. Cr–Cr2O3cermet PVD coatings can be successfully employed in thermal converters. Their energy conversion efficiency depends on their chemical and physical structural characteristics and related optical properties like reflectance, emittance, solar light absorption, or absorptance and transmittance. Parameters such as roughness and topographic characteristics of the produced coatings will greatly influence their relevant optical properties. A careful evaluation of the coatings' roughness and their microtopographic inspection is fundamental. The Cr–Cr2O3cermet coatings sputter deposited on cooper and aluminium shows similar absorption (92%) but the first ones present a better emittance and higher waviness (over30%) with similar roughness. In comparison with commercially available solar panels with a slightly better absorption but worse emittance our coatings have a much lower waviness (∼150%) and roughly50%higher roughness.

Photocatalysis of functionalised 3D printed cementitious materials

“…For the micro-surface analysis, the MICROTOP.06.MFC device was used as a non-destructive and non-contact method. This technology is a versatile and robust system that is mainly designed for 2D/3D micro-topographic analysis of the rough surfaces of small size samples [42]. The MICROTOP.06.…”

“…The MICROTOP.06. MFC setup has an active optical triangulation system in which the scanning of the sample's surface is carried out through an oblique incidence of a light beam and a normal/specular observation [42,43]. Fig.…”

“…2 shows a general perspective of the setup. Additional information regarding the setup, including the definitions of each component, as well as a detailed description of the scanning mechanism, can be found elsewhere [42,43]. In this study, 701 × 201 points in an area of 4 × 4 mm 2 were scanned on the surface of the specimens.…”

Microtopographic non-invasive inspection for determining roughness parameters of dental biomaterials

“…El dispositivo experimental empleado para realizar la inspección microtopográfica no invasiva de las muestras se representa en la figura 1. Se trata del microtopógrafo láser basado en triangulación óptica activa MICROTOP.06.MFC [15][16][17].…”

“…El montaje es muy versátil y ha sido utilizado para diferentes tareas de inspección en diversos tipos de muestras (películas delgadas, moldes y tejidos) [12]. Concretamente, se han realizado con éxito medidas tanto en materiales opacos como translúcidos [13,14,16,17]. Para la realización de las medidas, el aparato dispone de un sistema de aislamiento de vibraciones.…”