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Infrared vs Ultraviolet | Difference between IR and UV

This page compares Infrared (IR) vs Ultraviolet (UV) and mentions difference between IR and UV based on frequency, wavelength, range, advantages and disadvantages.

IR (Infrared)

• Wavelength : 760 nm to 1 mm
• Communication distance : Short and medium ranges in LiFi and OCC
• Advantages: It is not visible for human eye
• Disadvantages: It is not always safe for human. LOS communication and very limited low data rate NLOS communication using reflection of infrared waves.
• Applications : LiFi, OCC (Optical Camera Communication), FSO (Free Space Optical) communication, LiDAR

Following table mentions sub bands of IR (Infrared) with its frequency and wavelength values.


IR Sub Bands Frequency Wavelength
Far Infrared (FIR) 0.3 to 20 THz 1 to 0.015 mm
Long Wavelength Infrared (LWIR) 20 to 37.5 THz 0.015 to 0.008 mm
Mid Wavelength Infrared (MWIR) 37 to 100 THz 0.008 mm to 0.003 mm
Short Wavelength Infrared (SWIR) 100 to 214.3 THz 3000000 to 1400 nm
Near Infrared (NIR) 214.3 to 394.7 THz 1400 to 760 nm

Ultraviolet (UV)

• Wavelength : 10 to 400 nm
• Communication distance : Short and medium ranges in LiFi
• Advantages : High data rate NLOS communication is possible, Not visible for human eye.
• Disadvantages : Not safe for human
• Applications : LiFi, FSO

Following table mentions sub bands of UV (Ultraviolet) with its frequency and wavelength values.


UV sub bands Frequency Wavelength
Ultraviolet A (UVA) 750 to 952.4 THz 400 to 315 nm
Ultraviolet B (UVB) 952.4 to 1071 THz 315 to 280 nm
Ultraviolet C (UVC) 1.071 to 3 PHz 280 to 100 nm
Near Ultraviolet (NUV) 0.750 to 1 PHz 400 to 300 nm
Middle Ultraviolet 1 to 1.5 PHz 300 to 200 nm
Far Ultraviolet 1.5 to 2.459 PHz 200 to 122 nm
Hydrogen Lyman-alpha 2.459 to 2.479 PHz 122 to 121 nm
Extreme ultra violet (EUV) 2.479 to 30 PHz 121 to 10 nm
Vacuum ultraviolet 1.5 to 30 PHz 200 to 10 nm


Ultrasonic sensor and Infrared sensor related links

Ultrasonic vs Infrared
Infrared sensor basics and working operation
Advantages and disadvantages of Infrared Sensor
Ultrasonic sensor basics and working operation
Advantages and disadvantages of Ultrasonic sensor


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