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Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with waves that are just longer than those of red light (the longest waves in the visible spectrum ), so IR is invisible to the human eye.
A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
The term was first introduced by Harald Haas during a 2011 TEDGlobal talk in Edinburgh. [1] Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible light, ultraviolet, and infrared spectrums. In its present state, only LED lamps can be used for the transmission of data in visible light. [2]
Thermogram of a traditional building in the background and a "passive house" in the foregroundInfrared thermography (IRT), thermal video or thermal imaging, is a process where a thermal camera captures and creates an image of an object by using infrared radiation emitted from the object in a process, which are examples of infrared imaging science.
Bengali is typically thought to have around 100,000 separate words, of which 16,000 (16%) are considered to be তদ্ভব tôdbhôbô, or Tadbhava (inherited Indo-Aryan vocabulary), 40,000 (40%) are তৎসম tôtśômô or Tatsama (words directly borrowed from Sanskrit), and borrowings from দেশী deśi, or "indigenous" words, which are at around 16,000 (16%) of the Bengali ...
In infrared photography, the photographic film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Film is usually sensitive to ...
Infrared heating uses infrared lamps, commonly called heat lamps, to transmit infrared radiation to the body that is being heated. When a body with a large surface area needs to be heated, an array of infrared lamps is often used. The lamp commonly contains an incandescent bulb that produces infrared radiation.
[2] [3] Though, it joined later compared to top Wikipedias, it ranks 5th in terms of article depth among 318 active wikipedias by language. [4] As of June 2020, the Bengali Wikipedia is the only online free encyclopedia written in the Bengali language. It is also one of the largest Bengali content related sites on the internet.