infrapunaalueelta

Infrapuna-alueelta is a Finnish term meaning from the infrared region of the electromagnetic spectrum. It is used to describe data, signals or phenomena that originate in infrared wavelengths, typically from about 700 nanometers to about one millimeter.

The infrared region is commonly subdivided into near-infrared (approximately 0.7–2.5 μm), mid-infrared (2.5–25 μm), and far-infrared (25–1000 μm). These subregions cover thermal emission from objects at ordinary temperatures and many molecular vibrational transitions, making infrared measurements valuable in both physical and chemical contexts.

Applications and usage. Infrared-origin information is central in astronomy for studying cool stars and dust, in remote sensing and earth observation, in thermal imaging and surveillance, and in chemical spectroscopy. Infrared radiation enables detection of heat signatures and analysis of material composition through characteristic absorption and emission features.

Detection and instrumentation. Infrared observations and measurements rely on specialized detectors such as mercury cadmium telluride (HgCdTe) and indium antimonide (InSb) photodetectors, bolometers, and other thermal sensors. Because water vapor and carbon dioxide absorb infrared radiation, many infrared observations require high-altitude, airborne, or space-based platforms, or observations during atmospheric windows with reduced absorption.

Etymology and usage in Finnish. The term infrapuna combines the prefix infra- (below) with puna (red), reflecting the historical association of infrared light with wavelengths just beyond visible red. alueelta denotes “from the region,” so infrapuna-alueelta literally means from the infrared region. The phrase is used in scientific and technical Finnish to indicate measurements, data, or phenomena attributable to infrared wavelengths.