Infrared radiation

Infrared radiation (IR radiation for short) refers to electromagnetic waves in the visible spectral range between red light and the longer wavelength of microwave radiation (also called terahertz radiation). Infrared radiation (IR) thus has wavelengths λ between (780 nm) and 1 mm, which corresponds to a frequency range from 300 GHz to 400 THz.

Prism

Infrared radiation was discovered in 1800 by Friedrich Wilhelm Herschel while attempting to measure the temperature of different colors of sunlight. He first separated sunlight by passing it through a prism and then placed a thermometer in the individual color areas. He noted that the highest temperature reading actually came from the area beyond the red end of the visible spectrum. From this observed temperature increase, he concluded that the solar spectrum continues on beyond the visible red end.

Classification of the infrared spectral range into bands is not clearly defined. The technical applications of NDIR gas analysis, flame spectroscopy and pyrometry often use the subdivision of NIR, SWIR, MWIR, LWIR and FIR. The CIE (International Commission on Illumination) and DIN 5031-7 propose a division into bands IR-A, IR-B and IR-C.

Description

German
Abbreviation

English
Abbreviation

Abbreviation according
to CIE or DIN

Waverlength
[µm]

linie

Near-infrared

NIR

NIR

IR-A

(0.78 … 1.4)

linie

Near-infrared

NIR

SWIR

IR-B

(1.4 … 3.0)

linie

Midwave-infrared

MIR

MWIR

IR-C

(3 … 8)

linie

Midwave-infrared

MWIR

LWIR

IR-C

(8 … 15 (50))

linie

Far-infrared

FIR

FIR

IR-C

(15 (50) … 1,000)

linie

Electromagnetic Spectrum

Spektralbereich

 

 

Pyroelectric detectors by InfraTec are particularly good in metrology, especially in the mid-infrared range, but can also be used for laser applications in UV (eg. 193 nm) and in the range of extreme infrared radiation (Terahertz).

The fundamental frequencies of the absorption bands for many gases can be found in the mid-infrared range of (2.5 to 13) µm. By determining the characteristic radiation absorption by thermal sensors (pyroelectric detectors and thermopile), gases such as CO2, CO, NOX, ozone and hydrocarbons (alkanes, halogenated aromatic, refrigerant) can be identified and quantified. Use of attenuated total reflection (ATR – attenuated total reflection) enables measurement of gases in liquid media. By detecting typical gas emissions in the MIR, which result in a fire, flames can be detected very safely and reliably over long distances (Flame Detector, Tripel IR, IR3).

Contact

Headquarters:

InfraTec GmbH
Infrarotsensorik und Messtechnik
Dresden, GERMANY
workPhone:+49 351 871-8625

Branch offices:

InfraTec infrared LLC
Plano, TX 75024
workPhone:+1 877 797 6748

www.InfraTec-infrared.com

InfraTec infrared Ltd
Chesterfield, UK
workPhone:+44 1246 267562

InfraTec Representative for PR of China
c/o German Industry & Commerce
Greater China
Shanghai, PR of China

workPhone:+8621 68758536 ext 1633

InfraTec-TUEV-Seal