Light source, which is formed as a lyman - radiator for the transmission of a spectrum in the ultraviolet

摘要

1,036,190. Discharge lamps. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE. Nov. 18, 1964 [Nov. 25, 1963], No. 46921/64. Heading H1D. In an ultra-violet source for a spectrograph, the discharge between the main electrodes is initiated by a spark passing across the surface of a solid dielectric material which separates two auxiliary electrodes, a first capacitor being discharged across the auxiliary electrodes to produce the discharge of a second capacitor across the main electrodes. Metal vessel 1 acts as the earthed main electrode, and is joined by the alumina, silica or P.T.F.E. tube 4 to the anode 3, which is surrounded by the coaxial extension 12 of the vessel 1. Vessel 1 has an evacuation port 2 and an aperture 14 for correction of the spectrograph 13, and houses the auxiliary electrodes 5 and 6 which are spaced apart by a silica, alumina, or mica strip 7. Contamination resulting from vaporization of the material of tube 4 is reduced by protecting anode 3 with a tantalum cap 5, and aperture 14 by aluminium discs 16. A rotary switch successively and repetitively makes connections (Fig. 2, not shown) to charge up a first and then a second capacitor bank from a 30 kv. source, and then to discharge the second bank across electrodes 5 and 6 to produce a sliding spark across the surface of dielectric 7 which initiates the discharge of the first bank across electr o des 1 and 3. In a modified supply arrangement, the controlled repetitive discharge across electrodes 5 and 6 is produced by a pulse generator and thyratron.