当我们开始筹备“2015世界计量日”活动，并考虑以“计量与光”作为今年的主题时，我想到这个主题与以往世界计量日的主题密切相关：
　　我们的日常生活离不开光（2013年主题：计量与生活）;
　　工作场所和街道照明为我们的健康和安全保驾护航（分别为2006年主题：计量与节约能源和2012年主题：计量与安全）;
　　随着世界各国和区域经济的快速发展，需要更多的光，也需要更多的电，这将对全球能源供给构成挑战（2014年主题：计量应对能源挑战）。
　　我们生活在一个充满光明的世界里。每天，看太阳升起，阳光为生命提供能量；每天，我们拨动开关，让灯光照亮世界。
　　然而，《华盛顿邮报》最近刊登的文章中提出了一个严峻的问题：“全球电气化增长率跟不上人口增长率”。一份来自于国际能源署和世界银行报告中也提到：“据数据分析，到2030年世界上仍将有12%的人口用不上电。
　　这需要通过增加经费或者一种新的途径来解决。为了解决这个问题，联合国也在努力，在应对气候变化的同时，提出避免全球气温上升超过2℃。要完成这两个目标，世界各国必须提高能源利用率并鼓励生产和使用清洁能源。这将需要：
　　◆通过大量的测量知晓并提高电器的能效；
　　◆提高清洁能源的产量和使用量；
　　◆额外制定一些节能领域的国际标准；
　　众所周知，光具有波粒二象性：既可表现为波也可表现为粒子，或者同时具备两者特性。作为计量工作者，我们既可以测量光，也可以利用光来进行测量，这同样显而易见。
　　光在真空中的速度，通常表示为c。在许多物理学领域中，c是一个非常重要的物理常数，其数值精确定义为299792458米/秒。国际单位制“米”的定义就来源于光速。此外，距离、速度、温度、食物和环境中的化学成分及污染物、常见的法检分析，都可以用不同形式的光来进行测量。
　　源于上述这些最初的想法，我将继续思考我们每天都能享受到的光的现象和奇迹。法制计量组织很高兴与联合国教科文组织一起，加入到“世界光学年”的活动中，在“世界计量日”来临之际，祝愿大家拥有一个快乐、光明的未来，这是无以计量的！

　　2015年世界计量日英文原版：

　　As we begin our preparations for World Metrology Day, 2015 and as we consider this year’s theme, Measurements and Light, I think about how this current theme is very closely  related to those of previous World Metrology Days:
　　light is important in everyday life (the theme for 2013);
　　workplace and street lighting benefit both our health and our safety (the themes for 2006 and 2012 respectively); and
　　with the increasing economic growth in many areas of our planet, the demand for more light and therefore more electricity certainly creates a global energy challenge (the theme for 2014).
　　We live in a highly visual world. Each day we see the sun rising, providing the essential requirements for life itself. Each day a large percentage of the worldis able to simply flip a switch and turn on an electric light.
　　However, a recent article in the Washington Post identified a significant challenge: “The rate of growth in global electrification is slower than the rate of growth of the population”. A report from the IEA and the World Bank states: “With regard to universal access, business as usual would leave 12 percent … of the world’s population in 2030 without electricity…".
　　Without a significant increase in spending or a new direction to solve the problem, this will not change. To compound this issue the UN is also trying to address climate change at the same time – and prevent global temperatures from rising by more than 2 °C. To satisfy both goals, nations around the world would need to improve their energy efficiency and bolster the amount of clean energy they produce and use. This will require  more measurements to understand and improve the efficiency of electrical appliances,
an increase in the amount of clean energy produced and consumed, and  additional international standards that apply directly to this area.
　　Light can behave either as a wave or a particle, or sometimes as both. This is quite remarkable. Also, as metrologists, we think of light as something that is measured, but we also use it to make measurements, again quite remarkable.
　　The speed of light in vacuum, commonly denoted c, is a universal physical constant which is important in many areas of physics. Its defined value is exactly 299 792 458 m/s, as the SI metre is defined from this constant. Distance, speed, temperature, the composition and contaminants in our food and environment,common measurements to legal metrology, can all be measured using various forms of light.
　　It is with these initial thoughts that I continue to consider with great wonder the phenomenon which we enjoy every day as light. The legal metrology community is pleased to join with UNESCO in marking the International Year of Light and I wish you immeasurable happiness and a very bright future.

感谢苏州市计量测试研究所提供翻译支持

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