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A New Diffuse Optics Emitter for High Visual Diffuse Transmission Density Measurement

1
Div. of Optics, National Institute of Metrology, Beijing 100029, China
2
Photonics and Sensors Group, Department of Engineering, University of Cambridge, Cambridge cb3 0fa, UK
3
School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, China
4
State Grid Beijing Electric Power Company Training Center, Beijing 100041, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(14), 2774; https://doi.org/10.3390/app9142774
Received: 6 June 2019 / Revised: 24 June 2019 / Accepted: 6 July 2019 / Published: 10 July 2019
(This article belongs to the Section Optics and Lasers)
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PDF [2142 KB, uploaded 10 July 2019]
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Abstract

In visual diffuse transmission density measurement, it is hard to measure optical density (OD) up to 6.0 because the signal to noise is more than 10E-06. Thus, there are only two methods to find the measurement. One is using a highly sensitive detector with low background noise, and the other is improving the incident light flux with a wide spectrum, including visual scope. A new diffuse optics emitter was designed to realize OD measurements up to 6.0. It uses 235 optical fibers on a hemisphere to collect and feed in the incident flux, then emits this flux by a diffuse opal. Thus, an incident light with a high diffuse coefficient and high incident flux was realized for high OD measurement. This emitter has been used in the new national reference of National Institute of Metrology, China (NIM) for diffuse transmission optical density. According to the measurement result in this reference, the OD can be measured up to 6.6. View Full-Text
Keywords: visual diffuse transmission density; diffuse optics emitter; high diffuse coefficient; national reference densitometer visual diffuse transmission density; diffuse optics emitter; high diffuse coefficient; national reference densitometer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, Z.; Li, Y.; Jiang, Y.; Li, J.; Liu, R.; Zhang, S.; Zhang, Q.; Chen, R. A New Diffuse Optics Emitter for High Visual Diffuse Transmission Density Measurement. Appl. Sci. 2019, 9, 2774.

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