Accurate characterisation of optical diffuse transmission – primary facility and extension to translucent samples

IF 2.1 3区工程技术 Q2 INSTRUMENTS & INSTRUMENTATION

Metrologia Pub Date : 2024-07-10 DOI:10.1088/1681-7575/ad615c

J. Fu, T. Quast, S. Teichert, M. Pastuschek, Alfred Schirmacher, P. Santafé Gabarda, Kai-Olaf Hauer, Alejandro Ferrero

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Abstract

To perform accurate, high-quality and traceable measurement of optical diffuse transmission, which is quantified using the bidirectional transmittance distribution function (BTDF), a new primary facility has been developed at the Physikalisch-Technische Bundesanstalt (PTB), the German metrology institute. This newly developed reference facility will complement the available calibration services and research facilities at PTB for regular reflectance and transmittance and diffuse reflectance. The performance of the new BTDF setup has been investigated in an internal comparison, where consistency of the results was achieved. A thorough uncertainty analysis results in a minimum combined standard (k = 1) uncertainty of about 0.8 %. Research on the accurate characterisation of the BTDF of samples with non-negligible lateral scattering is being carried out on this new setup. Some first results have shown that the measured BTDF value depends on the applied irradiation area size. An empirical model has been found to describe the diffuse transmission of such translucent samples with different scattering parameters.

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光学漫反射透射的精确表征--主要设备并扩展至半透明样品

为了对使用双向透射分布函数（BTDF）量化的光学漫反射进行精确、高质量和可溯源的测量，德国计量研究院物理技术联邦局（PTB）开发了一种新的初级设施。这一新开发的参考设施将补充 PTB 现有的常规反射率、透射率和漫反射率校准服务和研究设施。新的 BTDF 设置的性能已在内部比较中进行了调查，结果一致。通过全面的不确定性分析，综合标准（k = 1）的最小不确定性约为 0.8%。目前正在利用这套新设备对具有不可忽略的横向散射的样品的 BTDF 精确特性进行研究。一些初步结果表明，测得的 BTDF 值取决于应用辐照区域的大小。我们已经找到了一个经验模型来描述这种具有不同散射参数的半透明样品的漫射透射率。

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来源期刊

Metrologia 工程技术-物理：应用

CiteScore

2.80

自引率

25.00%

发文量

137

审稿时长

12 months

期刊介绍： Published 6 times per year, Metrologia covers the fundamentals of measurements, particularly those dealing with the seven base units of the International System of Units (metre, kilogram, second, ampere, kelvin, candela, mole) or proposals to replace them. The journal also publishes papers that contribute to the solution of difficult measurement problems and improve the accuracy of derived units and constants that are of fundamental importance to physics. In addition to regular papers, the journal publishes review articles, issues devoted to single topics of timely interest and occasional conference proceedings. Letters to the Editor and Short Communications (generally three pages or less) are also considered.