In this research, the portable leaf area meter is designed by combining microcontroller with light source LED and light sensor.

本研究利用微控制器作为控制单元，结合LED光源和传感器设计研制了一种便携式叶面积仪。

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Dr. Grokhovsky said the search was hampered by officials of Russia's Emergency Situations Ministry, which sealed off the area around an 8-meter-wide hole in the ice of Lake Chebarkul, near Chelyabinsk, where a chunk of the meteor was believed to have fallen.

WSJ: Russia Meteor Was Largest in More Than a Century

Light meter readings from volunteers have confirmed that the area already has some of the darkest skies in England.

BBC: Dark sky protection bid for Northumberland