UV light source having combined ionization and formation of excimers

Patent metadata

Field	Value
Publication number	US-9718705-B2
Application number	US-201314436884-A
Country	US
Kind code	B2
Filing date	Oct 18, 2013
Priority date	Oct 19, 2012
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The invention relates to a device for producing UV light. Said device provides light from light sources that operate in accordance with different physical principles. The device comprises a chamber having several gas-filled plasma chambers ( 11, 12 ), wherein the chamber has at least one area ( 37, 39 ) transparent to UV light and/or VUV light. A first group ( 11 ) of plasma chambers is filled with an ionizable gas containing mercury and a second group ( 12 ) of plasma chambers is filled with a gas that forms excimers when suitably excited.

First claim

What is claimed is:

1. A device for producing UV light and/or vacuum UV light, the device comprising:
a UV-transparent chamber comprising at least one area transparent for UV light and/or vacuum UV light;
a first group of plasma chambers filled with a mercury-containing ionizable gas;
a second group of plasma chambers filled with a gas that forms excimers upon suitable excitation;
wherein a plasma chamber of the second group and a plasma chamber of the first group are directly joined by a common wall, wherein said plasma chamber of the second group is positioned with a wall opposite the common wall next to the at least one area transparent for UV light and/or vacuum UV light;
wherein said plasma chamber of the second group forms a thermal insulation for said plasma chamber of the first group.

2. The device according to claim 1 , wherein the plasma chambers of the first group emit a first UV light at a wavelength of 254 nm and the plasma chambers of the second group emit a second UV light at a wavelength of less than 250 nm.

3. The device according to claim 2 , wherein the second UV light has a wave length of less than 220 nm.

4. The device according to claim 1 , wherein the plasma chambers of the second group are configured to be excited by a dielectric barrier discharge (DBD); capacitive discharge; inductive coupling (ICP); and/or microwaves.

5. The device according to claim 1 , wherein the UV-transparent chamber comprises at least one plate that is transparent for UV light and/or vacuum UV light, wherein a thermal insulation that is transparent for UV light and/or vacuum UV light is arranged between the plasma chambers of the first group and the at least one plate.

6. The device according to claim 5 , wherein the plasma chambers of the first group include plasma chambers arranged in a first row parallel to the at least one plate.

7. The device according to claim 6 , wherein the plasma chambers of the first group include plasma chambers arranged in a second row parallel to a second one of the at least one plate.

8. The device according to claim 1 , wherein the plasma chambers of the first group are filled with mercury vapor and noble gases.

9. The device according to claim 1 , wherein the plasma chambers of the second group are filled with halogens or noble gases or mixtures thereof or chemical compounds thereof.

10. The device according to claim 1 , wherein the plasma chambers of the first group include at least one plasma chamber filled with a mercury-containing gas and wherein the plasma chambers of the second group include at least one excimer radiator.

11. The device according to claim 1 , wherein a pressure between 10 −2 mbar and 10 bar exists in the plasma chambers of the first group and in the plasma chambers of the second group.

12. The device according to claim 1 , wherein the plasma chambers of the first group and the plasma chambers of the second group are arranged within the UV-transparent chamber.

13. The device according to claim 1 , wherein the plasma chambers of the first group are configured to be excited by electrodes with a frequency of excitation in a range between approximately 50 Hz up to 10 5 kHz; by inductive coupling (ICP); and/or by microwaves.

14. The device according to claim 13 , wherein the microwaves are injected as a surface-sustained wave into the plasma chambers of the first group.

15. The device according to claim 13 , further comprising at least one magnetron configured to generate the microwaves and wherein the at least one magnetron is arranged outside or inside the UV-transparent chamber.

16. The device according to claim 13 , wherein the UV-transparent chamber comprises at least one opening and the microwaves pass through the at least one opening into the UV-transparent chamber.

17. The device according to claim 13 , wherein the UV-transparent chamber comprises at least one opening and the microwaves generated by the at least one magnetron are injected through the at least one opening into the UV-transparent chamber.

18. The device according to claim 13 , wherein, outside of the UV-transparent chamber, electrodes for inductive coupling (ICP); a dielectric barrier discharge (DBD); and/or a capacitive discharge are provided.

19. The device according to claim 18 , wherein the microwaves are injected as a surface-sustained wave into the plasma chambers of the second group.

20. The device according to claim 18 , further comprising at least one magnetron configured to generate the microwaves and wherein the at least one magnetron is arranged outside or inside the UV-transparent chamber.

21. The device according to claim 18 , wherein the UV-transparent chamber comprises at least one opening through which the microwaves pass into the UV-transparent chamber.

22. The device according to claim 21 , wherein the UV-transparent chamber comprises at least one opening and through the at least one opening the microwaves generated by the at least one magnetron are injected into the UV-transparent chamber.

23. The device according to claim 18 , wherein, outside of the UV-transparent chamber, electrodes for inductive coupling (ICP); a dielectric barrier discharge (DBD); and/or a capacitive discharge are provided.

Assignees

• Fraunhofer Ges Forschung
• Sico Tech Gmbh

Inventors

• Elkin Bentsian
• Lohner Alexander
• Egner Siegfried

Classifications

• H01J61/94

  Paths producing light of different wavelengths, e.g. for simulating daylight · CPC title

• C02F2201/3221

  Lamps suspended above a water surface or pipe · CPC title

• C02F2303/04

  Disinfection · CPC title

• H01J61/16

  having helium, argon, neon, krypton, or xenon as the principle constituent · CPC title

• C02F2201/3228

  Units having reflectors, e.g. coatings, baffles, plates, mirrors · CPC title