%0 Journal Article
%4 sid.inpe.br/plutao/2020/06.15.23.30
%2 sid.inpe.br/plutao/2020/06.15.23.30.36
%@doi 10.3847/1538-4365/ab7af8
%@issn 0067-0049
%F lattes: 9831996893882845 2 CarlessoViBeSaReFiMi:2020:PhOpPr
%T Physical and optical properties of ultra-black nickel-phosphorus for a total solar irradiance measurement
%D 2020
%9 journal article
%A Carlesso, Franciele,
%A Vieira, Luis Eduardo Antunes,
%A Berni, Luiz Angelo,
%A Savonov, Graziela da Silva,
%A Oliva, Alberto Remesal,
%A Finsterle, Wolfgang,
%A Miranda, Edson Luiz de,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Physikalisch-Meteorologisches Observatorium Davos
%@affiliation Physikalisch-Meteorologisches Observatorium Davos
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress franciele.carlesso@inpe.br
%@electronicmailaddress luis.vieira@inpe.br
%@electronicmailaddress luiz.berni@inpe.br
%@electronicmailaddress graziela.savonov@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress edson.miranda@inpe.br
%B The Astrophysical Journal Supplement Series
%V 248
%N 248
%P 4
%X The total solar irradiance at the top of the atmosphere is the primary source of energy of the Earths highly coupled atmospherelandocean system. Small fluctuations of the solar flux density in scales from years to millennia could impact the energy balance of this system due to nonlinear effects. The quantification of this variability depends on absolute radiometers on board of space-based platforms. Although there has been significant improvement in the design and calibration of absolute radiometers during the last decades, the uncertainties in the measurements have not allowed us to untangle the natural and anthropogenic drivers of the observed changes of the climatic patterns appropriately. One of the critical components of the absolute radiometers is the coating of the sensor elements, which should absorb the radiation efficiently. Here we discuss the optical characteristics of ultra-black Nickel Phosphorus (NiP) and its relations with the surface morphology. The ultra-black NiP has important unique properties such as low reflectance and uniformity of deposition in complex geometries. NiP multilayer was deposited by electroless on aluminum substrates. The surface was etched by oxidizing acid to produce ultra-black NiP. Characterization techniques were used to describe the properties of the material. We describe the directional reflectance employing the bidirectional reflectance distribution function. Additionally, we used reflectance maps to show the influence of the pores on the reflectance. Ultra-black NiP exhibited a high absorptance and dependence with the light incidence angle. Based on the results, the material demonstrated the opportunity of many terrestrial and space applications as a black coating absorber.
%@language pt
%3 carlesso_physical.pdf