Ánh sáng hồng ngoại
Ánh sáng hồng ngoại (tia hồng ngoại) là ánh sáng
không thể trông thấy được bằng mắt thường, mang bước sóng khoảng trong khoảng
0.86μm tới 0.98μm. Tia hồng ngoại với véc tơ vận tốc tức thời truyền bằng véc
tơ vận tốc tức thời ánh sáng.
Tia hồng ngoại với thể truyền đi được phổ quát kênh
dấu hiệu. Nó được ứng dụng rộng rãi trong công nghiệp. Lượng thông báo với thể
đạt 3 mega bit /s. Lượng thông tin được truyền đi mang ánh sáng hồng ngoại lớn
gấp nhiều lần so với song điện từ mà người ta vẫn dùng.
Tia hồng ngoại dễ bị tiếp thụ, khả năng xuyên thấu
kém. Trong điều khiển trong khoảng xa bằng tia hồng ngoại, chùm tia hồng ngoại
phát đi hẹp, sở hữu hướng, vì vậy khi thu phải đúng hướng.
Sóng hồng ngoại có những đặc tính quan trọng giống
như ánh sáng ( sự quy tụ qua thấu kính, tiêu cự …). Ánh sáng thường và ánh sáng
hồng ngoại khác nhau rất rõ trong sự xuyên suốt qua vật chất.
mang các vật chất ta thấy nó dưới 1 màu xám đục
nhưng với ánh sáng hồng ngoại nó phát triển thành xuyên suốt. Vì nguyên liệu
bán dẫn “trong suốt” đối có ánh sáng hồng ngoại, tia hồng ngoại không bị yếu đi
lúc nó vượt qua các lớp bán dẫn để đi ra ngoài.
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