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Electronic Imaging & Signal Processing



PROXIVISION announces the new XSB Photocathode -- available for missile threat detection and tracking. The XSB technique features advantages like quick response time, straightforwardness, less background and less false alarm rates, cost effectiveness, longer life time and better suitability for the detection of ground to air missiles.

The PROXIVISION XSB eXtended Solar Blind Photocathode operates in a wavelength range below 300nm. The XSB Photocathode sets the worldwide benchmark for many civilian and military applications such as biological agent and chemical detection, atmosphere and ozone monitoring, UV astronomy, detection of corona discharge, semiconductor wafer inspection and monitoring of engine/flames in the presence of a hot background.

Another increasing application of the image tube with XSB photocathode is the high speed wafer inspection in the ULSI manufacturing for the detection of defects or particles in ten nanometers range in the wafer pattern process due to the fact that the light scattering is proportional to ~1/λ4 (λ=wavelength). The utilization of the image tube with XSB photocathode combined with 248 nm KrF Laser or 266nm YAG laser should be most cost-effective solution.

PROXIVISION has more than 20 years experience in the development and manufacturing of solar blind image intensifiers. By utilization of new technologies, solely developed by PROXIVISION, the novel CsTe-based XSB Solar Blind Photocathode has been successfully commercialized for our XSB Image Intensifiers with quantum efficiency (QE) up to 30% at the wavelength of 280nm, and to 35% at the wavelength of 260nm, more than two times higher than the traditional standard solar blind image intensifiers.

Another key parameter for a high performance solar blind photocathode, is its ability to suppress the visible light signal when operated in daylight or other visible light 2/2 background environment. An optimized ratio of S(280nm)/S(520nm means less requirements for an additional blocking filter which can significantly reduce the useful UV signal. The XSB Image Intensifier provides a S(280nm)/S(550nm) suppression ratio more than 5 orders.

PROXIVISION will showcase the Solar Blind Photocathode at the SPIE Defense, Security & Sensing Expo in Baltimore, Md., May 5-9.