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Infrared radiation lies between visible light and microwaves, typically spanning about 780 nm to 1 mm.
Infrared (IR) is electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. It is commonly defined as starting just beyond the red edge of the visible spectrum (about 780 nm) and extending to roughly 1 mm (300 GHz), though there is no single universally accepted boundary. As part of the electromagnetic spectrum, IR occupies the region between visible light and microwaves, and it carries energy and momentum like other electromagnetic radiation. IR is closely related to thermal phenomena and molecular energy transitions. Almost all black-body radiation from objects near room temperature falls in the IR band, and IR emission/absorption occurs when molecules change rotational-vibrational motion, making IR useful for studying molecular energy states. The IR band is also subdivided differently depending on standards and applications (e.g., near-, short-, mid-, and long-wavelength IR; or CIE/ISO schemes), reflecting that different sensors and scientific uses operate over different wavelength ranges.
Infrared radiation lies between visible light and microwaves, typically spanning about 780 nm to 1 mm.
IR is strongly associated with thermal emission from objects near room temperature and with molecular rotational-vibrational transitions.
The infrared band has multiple subdivision schemes (e.g., near/mid/long IR or CIE/ISO divisions) because boundaries vary by definition and by sensor/application needs.
Electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves, typically defined as about 780 nm to 1 mm.
The full range of electromagnetic radiation organized by wavelength or frequency, with infrared positioned between visible light and microwaves.
Thermal radiation emitted by an object across wavelengths, with near-room-temperature emission concentrated largely in the infrared.
Changes in a molecule’s rotational and vibrational energy states that can be excited or probed by infrared radiation.
A relationship stating that the peak wavelength of thermal radiation shifts inversely with absolute temperature, affecting where emission occurs within the IR band.
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