Near infrared
Near Infrared (NIR)
Near Infrared (NIR) (pronunciation: /nɪər ˈɪnfrəˌred/) is a region of the electromagnetic spectrum that lies just beyond the visible light range, with wavelengths ranging from about 700 nanometers (nm) to about 2500 nm.
Etymology
The term "Near Infrared" is derived from the English words "near" and "infrared". "Near" signifies proximity, while "infrared" refers to a type of light that is below the red part of the visible spectrum.
Definition
Near Infrared is a type of infrared radiation that is closest in wavelength to visible light and is often used in scientific and medical applications such as spectroscopy, thermal imaging, and photodynamic therapy.
Related Terms
- Infrared: A type of electromagnetic radiation with longer wavelengths than those of visible light.
- Spectroscopy: The study of the interaction between matter and electromagnetic radiation.
- Thermal Imaging: A method of improving visibility of objects in a dark environment by detecting the objects' infrared radiation and creating an image based on that information.
- Photodynamic Therapy: A form of phototherapy using nontoxic light-sensitive compounds that are exposed selectively to light, whereupon they become toxic to targeted malignant and other diseased cells.
Applications
Near Infrared technology is used in a variety of applications, including medical imaging, agriculture, and astronomy. In the medical field, it is used in pulse oximetry to measure oxygen saturation in the blood, and in optical coherence tomography to produce detailed images of the body's tissues.
See Also
External links
- Medical encyclopedia article on Near infrared
- Wikipedia's article - Near infrared
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