Lähisinfrapuna

Lähisinfrapuna, often abbreviated as NIR, refers to a specific portion of the electromagnetic spectrum, typically spanning wavelengths from about 700 nanometers (nm) to 2500 nm. It lies just beyond the visible red light and before the mid-infrared region. While invisible to the human eye, NIR radiation has various applications due to its unique properties of interaction with matter.

NIR spectroscopy is a common analytical technique that utilizes the absorption and scattering of NIR light to identify and quantify substances. Different molecules absorb NIR light at characteristic wavelengths, allowing for their detection. This non-destructive method is widely employed in industries such as agriculture for analyzing grain moisture content, food processing for quality control, and pharmaceuticals for ingredient verification.

In medicine, NIR is used for imaging and therapeutic purposes. Photobiomodulation, for instance, employs NIR light to promote tissue healing and reduce inflammation. Near-infrared spectroscopy can also be used for non-invasive monitoring of blood oxygenation and other physiological parameters.

Beyond analysis and medicine, NIR plays a role in technology. It is used in certain types of sensors, optical communication systems, and even in some printing technologies. The penetration depth of NIR light into materials can vary significantly depending on the material's composition, making it a versatile tool for probing internal structures or composition without direct contact.