Infrared Heat – History

Infrared radiation is a part of the electromagnetic spectrum, which adjoins the spectrum of visible light. IR wavelength ranges from 780 nm (nanometers) up to 1 mm (millimeters). The short-wave region of the IR-A radiation is at 780 to 1400 nm, the IR-B radiation 1400-3000 nm and the long wavelength area of the IR-C radiation above 3000 nm.

Conventional or Infrared Heating?

Infrared Spectrum Discovery

Sir William Herschel What is today known as Infrared Spectrum (a.k.a. radiation), was discovered around 1800 by astronomer Sir William Herschel as Thermal Radiation.
He directed sunlight through a glass prism to create a spectrum (the rainbow created when light is divided into its colors) and then measured the temperature of each color. Herschel used three thermometers with blackened bulbs (to better absorb heat) and, for each color of the spectrum, placed one bulb in a visible color while the other two were placed beyond the spectrum as control samples. As he measured the individual temperatures of the violet, blue, green, yellow, orange, and red light, he noticed that all of the colors had temperatures higher than the controls. Moreover, he found that the temperatures of the colors increased from the violet to the red part of the spectrum. After noticing this pattern Herschel decided to measure the temperature just beyond the red portion of the spectrum in a region where no sunlight was visible. To his surprise, he found that this region had the highest temperature of all.
Herschel performed additional experiments on what he called “calorific rays” (derived from the Latin word for heat) beyond the red portion of the spectrum. He found that they were reflected, refracted, absorbed and transmitted in a manner similar to visible light. What Herschel had discovered was a form of light (or radiation) beyond red light, now known as infrared radiation. The prefix infra means “below”. Herschel’s experiment was important because it marked the first time that someone demonstrated that there were types of light that we cannot see with our eyes.

Planck’s Law – pioneering result of modern physics and quantum theory

Max Plank

​Max Planck described in his well-known formula the spectral specific charisma of a so-called “Black body” as a function of a wavelength.
At a temperature of 300 Kelvin (which corresponds to about 26°C or 79F) lies the radiation maximum at almost exactly 10 microns
(10,000 nm) – exactly the area that happens to be the wavelength of eco2heat infrared heaters! For this reason, eco2heat infrared heaters are the most efficient and require far less power to heat the same surface area than infrared heaters from other manufacturers!

Heat Signature

Infrarotkamera ​Each “warm” body (body temperature above absolute zero point of approximately -273°C or -459F) emits infrared radiation. The warmer a body is, the more energy in the form of infrared radiation it emits, and the shorter the wavelength of such radiation. A human body’s heat signature can be detected and recortded with an IR camera.

Ceramic stove tops also emit IR

Infrarot Herdplatte While a low intensity infrared radiation in IR-C spectrum is perceived as pleasant, IR radiation with high intensity can be harmful to health, if a person is staying too long and too close to the radiation source. A clear sign of a high intensity short wavelengths is that you can still see the red light portion of IR spectrum. It indicates a high-energy short-wave infrared radiation.​

Beware of a bright Infrared Radiation!

Infrarotstrahler Be especially aware of the so-called Bright Infrared Lamps that are still being used. Those generate a significant proportion of short-wave IR-A radiation with high intensity. Most of them utilize bimetallic heating elements that achieve surface temperatures up to 1,000°C or 1,832F!
The intensity of such radiation reaches 100-300 watts per sq.m and is way too hot when a subject is positioned closely, while the heat is being lost with a distance. The German Federal Office for Radiation Protection warns specifically against shortwave infrared-A radiation, as it penetrates and is harmful to the front part of the eye.

Visible or ….

sichtbar oder... ​Basically, whenever a heat spectrum(light) is visible, you should not stay near it for too long and too close. At the same time, the so-called Dark IR radiators in the C-wavelength range can even be beneficial to your health. An approximate wavelength value equals to the one that a human body produces.Thisvalue is about 9,700 nm and thus precisely the area in which the eco2heat infrared heaters operate!

…invisible?

unsichtbare Infrarotstrahlung ​Long-wave infrared radiation in the IR-C spectrum is not visible to the human eye, but can be made visible using photography. So, picture on the left shows not a snowy winter landscape, but an infrared image, where the bright areas are warmer than the darker areas of the image​.