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 the 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.

红外线 （英語： infrared，简称IR）是 波长 介乎 微波 与 可见光 之间的 电磁波，其波長在760 纳米 （nm）至1 毫米 （mm）之間， [1] 是波長比紅光長的非可見光，對應頻率約是在430 THz 到300 GHz 的範圍內 [2]。 室溫下物體所發出的 熱輻射 多都在此波段。 红外线於1800年由 威廉·赫歇爾 首次提出。 地球 吸收及發射紅外線 輻射 對 氣候 具影響，現今紅外線亦應用於不同科技領域。 红外线是在1800年由天文學家 威廉·赫歇爾 發現，他通过将 温度计 放置于 太阳光谱 的红 …

紅外線（英語： infrared ，簡稱IR）是波長介乎微波與可見光之間的電磁波，其波長在760納米（nm）至1毫米（mm）之間， [1] 是波長比紅光長的非可見光，對應頻率約是在430 THz到300 GHz的範圍內 [2] 。

红外线（infrared ray）又称红外辐射，介于可见光和微波之间、波长范围为0.76-1000微米的红外波段的电磁波。 它是频率比红光低的不可见光。 红外线的英文名是Infrared，其中的infra-意为意为“低于，在…下”。

Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm). Infrared waves are longer than visible light waves but shorter than radio waves.

Nanometer in Infrared Context. Nanometer (nm) is a unit of length in the metric system, equivalent to one billionth of a meter (1 nm = 10-9 meters). In the context of infrared (IR) radiation, it is used to specify the wavelength of the light.

Optical radiation with wavelengths shorter than 400 nm is called ultraviolet (UV) radiation and is further subdivided in UV-A, UV-B and UV-C ranges. Similarly, infrared (IR) radiation covers the wavelength range above 800 nm and is subdivided in IR-A, IR-B and IR-C ranges

Infrared radiation (IR), also known as thermal radiation, is that band in the electromagnetic radiation spectrum with wavelengths above red visible light between 780 nm and 1 mm. IR is categorized as IR-A (780 nm-1.4 µm), IR-B (1.4-3 µm) and IR …

2019年12月12日 · The infrared range covers 700-1000 nm (wavelength), or 14,286-12,800 cm-1 (wavenumber), and ultraviolet radiation has wavenumbers above these, approximately, 25,000 – 50,000 cm-1, or 100 to 400 nm (wavelength). An infrared spectrometer detects photons that are transmitted or absorbed when a sample is excited with infrared light.

近红外光（Near Infrared，NIR）是介于 可见光 （VIS） [2] 和 中红外光 （MIR）之间的 电磁波 ，按ASTM（美国试验和材料检测协会）定义是指波长在780～2526nm范围内的电磁波，习惯上又将近红外区划分为近红外短波（780~1100nm）和近红外长波（1100~2526nm）两个区域。