Near | 合法醫療器材資訊網

NEARINFRARED:...Betweenabout0.7to1.1micronswecanusethesameobservingmethodsasareuseforvisiblelightobservations,exceptforobservationbyeye ...

Infrared is usually divided into 3 spectral regions: near, mid and far-infrared. The boundaries between the near, mid and far-infrared regions are not agreed upon and can vary. The main factor that determines which wavelengths[1] are included in each of these three infrared regions is the type of detector technology used for gathering infrared light[2].

Near-infrared observations have been made from ground based observatories since the 1960s. They are done in much the same way as visible light observations for wavelengths less than 1 micron, but require special infrared detectors beyond 1 micron. Mid and far-infrared observations can only be made by observatories which can get above our atmosphere. These observations require the use of special cooled detectors[3] containing crystals like germanium whose electrical resistance is ve...