OSA Opto develops high performance UVC LED module
Parabolic array of reflectors boosts maximum optical power density in water disinfection LED module
As part of the activities within the consortium Advanced UV for Life in the field of water disinfection, OSA Opto Light has developed a high performance UVC LED radiation source, emitting 4W optical power at an emission wavelength between 275 and 280 nm.
It worked in close collaboration on the project with CiS Forschungsinstitut für Mikrosensorik, Fraunhofer IOSB, Branch Advanced System Technology, and Xylem Services.
The LED module has a unique aluminium parabolic array of reflectors emitting the light at an angle of about 15°; new anti-reflection coating on the front window with a transmission value of about 97 percent for a wavelength of 270-280 nm; and a new heat sink with a 40 percent lower thermal resistance compared to the old design, allowing low operation temperatures at power losses up to 400W.
The source also has integrated electronic control unit with computer software that enable good monitoring of the operation state of the system, overheating protection, and a safety shutdown, according to the company
The distribution of the irradiance at a distance of 1, 10, and 30 cm from the front window can be seen in the figure above. The usage of the parabolic reflector arrays means that a distance of 25 cm, it is possible to achieve a maximum optical power density of about 30 mW/cm², which is 50 percent from the initial maximum optical power density. (For comparison one can see according to the blue curve in the figure the Lambertian radiation of an LED module without lens or parabolic reflectors.)