Far Infrared Vs. Infrared

Infrared light is a range of wavelengths that lies between visible light and microwave on the electromagnetic spectrum.

Types

Although an entire range of wavelengths is considered to be infrared, the wavelengths generally are categorized by two types: "near infrared" or "far infrared" based on the actual size of the wavelength.

Identification

According to NASA, far Infrared waves are longer and are approximately the size of a pin head, while near infrared waves are much shorter in length and microscopic in size.

Significance

Far Infrared light wavelengths are powerful enough that the temperature sensitive nerve endings on human skin can detect their presence. Near Infrared wavelengths are not thermal and cannot be detected without special camera equipment, according to NASA.

Applications

Both types of infrared wavelengths have practical uses. Saunas and hot tubs have heating elements that use far infrared wavelengths because of the wavelengths' thermal properties. Televisions, on the other hand, use near infrared waves in the remote control.

Expert Insight

NASA describes the primary source of far infrared radiation as thermal radiation or heat; therefore, everything that has a temperature radiates infrared, even objects that are cold, such as a block of ice.

References

• NASA
• Spas and Tubs.com