Ultraviolet radiation source

Details Ultraviolet radiation source Ultraviolet radiation source

H - Electricity

05

B

313/112, 315/25,

H05B 41/36 (2006.01) A61L 2/10 (2006.01) H01J 61/10 (2006.01) H01J 61/12 (2006.01) H01J 61/30 (2006.01) H01J 61/56 (2006.01)

Patent

CA 1064569

ABSTRACT OF THE DISCLOSURE Apparatus for generating ultraviolet radiation of high spectral radiance whereby the radiation is produced in a discharge tube filled with mercury/argon and having a thermoemissive cathode and a discharge space by means of a wall-stabilized direct-current gas discharge at a mercury pressure pHg of between 5 x 10-3 and 5 x 10-1 Torr and a current density j of the discharge current I of between 1 and 25 A/cm2. The discharge tube incorporates a pressure-equalizing space connecting the cathode space to the anode space whereby the sum of the volumes of the cathode space, anode space and pressure-equalizing space is greater than the volume of the discharge space. The pressure of the argon is maintained between 0.01 and 10 Torr. A first control element is provided which regulates the current density j of the discharge current I to a constant value jO between 1 and 25 A/cm2. A second control element is provided which regulates the pressure pHg of the mercury to such a value that the yield ? of the line of wavelength 2537 .ANG., i.e. the ratio of the spectral radiation power for the wavelength .lambda.=2537 .ANG. to the electrical power stored in the discharge, is at least 80% of the maximum yield?max for the chosen current density jO.

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