一种用于高漫透射视觉密度测量的新型漫射光发射器

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

在漫透射视觉密度的测量中,当光学密度值超出6时,由于信号非常微弱(信号强度低于10^-6),其精确测量成为难点。本文提出一种新型漫射光发射器,用于实现高光学密度(大于6)的精确测量。在内壁漫反射半球结构上使用235根光纤导入光束,光线会聚后再次经乳白玻璃实现漫透射,因此保证了人射光同时具有高的光通量和漫射系数。该漫射光发射器已用于中国计量科学研究院新漫透射视觉密度国家基准装置,测量结果显示光学密度可达6.6。

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 10^-6.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.