Using a photometer that's more than three feet in diameter, Kepler is now continuously observing some 100,000 stars located between 600 and 3,000 light-years away.
利用一个直径超过3英尺的光度计，开普勒现正在不断观察位于600光年至3000光年远的约10万颗恒星。
The light from stimulating source to the pigment sample and the emitting light from the pigment sample to the photometer are transmitted by optical fibres.
从激发源到样品的激发光，以及从样品到光度计的发射光均由光纤进行传导。
Interplanting leaf area index, the daily changes of light transmittance and light intensity in the middle part of the canopy are observed with the LAI-2000 type and photometer.
采用LAI-2000冠层仪和照度计进行行间叶面积指数、株间透光率及树冠中部光照强度日变化进行测定；
Interplanting leaf area index, the daily changes of light transmittance and light intensity in the middle part of the canopy are observed with the LAI-2000 type and photometer.
采用LAI-2000冠层仪和照度计进行行间叶面积指数、株间透光率及树冠中部光照强度日变化进行测定；
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