The effect of UV and solar wind exposure on the reflectance of two black diffuse materials

Jinan Zeng; James Butler; Xiaoxiong Xiong; William Cook; Nathan Kelley

doi:10.1117/12.2569293

20 August 2020 The effect of UV and solar wind exposure on the reflectance of two black diffuse materials

Jinan Zeng, James Butler, Xiaoxiong Xiong, William Cook, Nathan Kelley

Proceedings Volume 11501, Earth Observing Systems XXV; 115010W (2020) https://doi.org/10.1117/12.2569293
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

The Bidirectional Reflectance Distribution Function (BRDF) and Total Hemispherical Reflectance (THR) of two candidate black diffuse materials for the dim calibration targets of the NASA GSFC PACE Ocean Color Instrument (OCI) were reported in the SPIE conference last year. In this paper, we present new BRDF and THR results of the two black diffuse materials following additional UV exposure and solar wind tests. The BRDF measurements for five samples of each two black diffuse material were made at incident angles of 0° and 45° and at the wavelengths of 360 nm, 600 nm, and 1600 using the Table-top Goniometer (TTG) located in the Diffuser Calibration Laboratory (DCL) at NASA GSFC. The THR of the samples, 15 mm in diameter, was measured using a commercial UV-VIS-NIR spectrophotometer from 200 nm to 2500 nm. The spectral THR results of the two black diffuse materials exposed to UV and solar wind show an approximate 10 % higher reflectivity than the unexposed samples. The spectral profiles of the THR of the exposed and unexposed samples are relatively similar. The BRDF results at the incident angle of 45° show different trends in the forward and backward scattering regions, while those at normal incident angle are consistent with the THR results. We will also present the details of the samples’ surface features and the comparison of the 0°/45° BRDF and THR results, demonstrate the significance of background subtraction in the THR measurements for small, low reflectance samples, and discuss validation of BRDF scale, measurement repeatability, and major contributions of uncertainty.

Conference Presentation

Citation Download Citation

Jinan Zeng, James Butler, Xiaoxiong Xiong, William Cook, and Nathan Kelley "The effect of UV and solar wind exposure on the reflectance of two black diffuse materials", Proc. SPIE 11501, Earth Observing Systems XXV, 115010W (20 August 2020); https://doi.org/10.1117/12.2569293

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available