IR radiation up to 1050 nm. Slightly more than half of the total energy from ir sensor pdf download Sun was eventually found to arrive on Earth in the
IR radiation up to 1050 nm. Slightly more than half of the total energy from ir sensor pdf download Sun was eventually found to arrive on Earth in the form of infrared. Infrared radiation is used in industrial, scientific, and medical applications.
Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus. Thermal-infrared imaging is used extensively for military and civilian purposes. Sunlight, at an effective temperature of 5,780 kelvins, is composed of near thermal-spectrum radiation that is slightly more than half infrared. Nearly all the infrared radiation in sunlight is near infrared, shorter than 4 micrometers.
On the surface of Earth, at far lower temperatures than the surface of the Sun, almost all thermal radiation consists of infrared in mid-infrared region, much longer than in sunlight. Of these natural thermal radiation processes only lightning and natural fires are hot enough to produce much visible energy, and fires produce far more infrared than visible-light energy. In general, objects emit infrared radiation across a spectrum of wavelengths, but sometimes only a limited region of the spectrum is of interest because sensors usually collect radiation only within a specific bandwidth. Therefore, the infrared band is often subdivided into smaller sections. Water absorption increases significantly at 1450 nm.