Lähiinfrapunavalolla

LÄHIinfrapunavalolla, often abbreviated as NIR or LÄHI-IR, refers to electromagnetic radiation within the near-infrared spectrum. This region of the spectrum falls between visible light and the mid-infrared range, typically spanning wavelengths from 700 nanometers to 2500 nanometers. NIR light is invisible to the human eye but can be detected by specialized sensors and cameras.

Its properties make it useful in a variety of applications. NIR light can penetrate certain materials, such as plastics and some fabrics, to varying degrees, allowing for analysis of their composition without direct contact. This characteristic is utilized in spectroscopy for identifying and quantifying chemical substances based on their unique absorption patterns in the NIR region. Industries employing NIR spectroscopy include food analysis, pharmaceuticals, and materials science.

In addition to analytical uses, NIR light also finds application in thermal imaging, though typically at longer infrared wavelengths. However, the energy associated with NIR photons can also induce vibrational transitions in molecules, which is the principle behind NIR spectroscopy. The development of efficient NIR light sources, such as LEDs and lasers, has further expanded its practical utility. Its non-ionizing nature also contributes to its safety in many consumer and industrial applications.