Ultraviolet diffusive illumination

• US 10,456,486 B2
• Filed: 12/22/2017
• Issued: 10/29/2019
• Est. Priority Date: 09/06/2013
• Status: Active Grant

• Current Assignee: Sensor Electronic Technology Incorporated (Seoul Semiconductor Co., Ltd.)
• Original Assignee: Sensor Electronic Technology Incorporated (Seoul Semiconductor Co., Ltd.)
• Inventors: Smetona, Saulius, Dobrinsky, Alexander, Bilenko, Yuri, Shur, Michael
• Primary Examiner(s): Smith, David E
• Application Number:
  US15/852,988
• Publication Number:
  US 20180133351A1
• Time in Patent Office: 676 Days
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: A61L 2202/14 Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 47/115 by determining the presence or movement of objects or living beings
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A solution for generating ultraviolet diffusive radiation is provided. A diffusive ultraviolet radiation illuminator includes at least one ultraviolet radiation source located within a reflective cavity that includes a plurality of surfaces. At least one of the plurality of surfaces can be configured to diffusively reflect at least 70% of the ultraviolet radiation and at least one of the plurality of surfaces can be configured to transmit at least 30% of the ultraviolet radiation and reflect at least 10% of the ultraviolet radiation.

Claims

1. An illuminator comprising:

a reflective cavity comprising a plurality of surfaces, wherein at least one surface of the plurality of surfaces is formed of a first material configured to reflect at least 70% of ultraviolet radiation, and at least one surface of the plurality of surfaces is formed of a second material configured to transmit at least 30% of the ultraviolet radiation through the second material and out of the reflective cavity and reflect at least 10% of the ultraviolet radiation, wherein the at least one surface formed of the second material includes non-uniform random nano-patterning;

a set of ultraviolet radiation sources, wherein at least one ultraviolet radiation source is located adjacent to a side surface of the reflective cavity and configured to generate ultraviolet radiation; and

at least one parabolic mirror located adjacent to the side surface of the reflective cavity and the at least one ultraviolet radiation source.

2. The illuminator of claim 1, wherein the at least one ultraviolet radiation source generates ultraviolet radiation that is directed towards the at least one surface that is configured to diffusively reflect at least 70% of the ultraviolet radiation.

3. The illuminator of claim 2, wherein the at least one surface that is configured to diffusively reflect at least 70% of the ultraviolet radiation includes a plurality of diffusive elements.

4. The illuminator of claim 1, wherein the at least one ultraviolet radiation source includes an array of ultraviolet light emitting diodes.

5. The illuminator of claim 4, where a peak wavelength for at least one ultraviolet light emitting diode is between 270 nanometers and 280 nanometers.

6. The illuminator of claim 5, wherein a peak wavelength for at least one ultraviolet light emitting diode is between 285 nanometers and 300 nanometers.

7. The illuminator of claim 1, further comprising a wave guiding structure adjacent to the at least one ultraviolet radiation source.

8. The illuminator of claim 1, wherein the first material is a fluoropolymer.

9. The illuminator of claim 1, wherein the second material is a fluoropolymer.

10. The illuminator of claim 1, wherein the at least one surface formed of the second material includes a set of transmission and reflection characteristics that are a function of lateral position along the at least one surface formed of the second material.

11. The illuminator of claim 10, wherein the non-uniform random nano-patterning of the at least one surface formed of the second material includes a plurality of voids with a pattern that is selected such that the ultraviolet radiation transmitted through the second material is uniform over an item a target distance away from the at least one surface formed of the second material.

12. The illuminator of claim 1, wherein at least one of the plurality of surfaces includes a plurality of diffusive elements.

13. The illuminator of claim 1, further comprising a partially transparent, partially reflective mesh located within the reflective cavity configured to diffusively reflect the ultraviolet radiation, wherein at least one ultraviolet radiation source in the set of ultraviolet radiation sources is located on the partially transparent, partially reflective mesh.

14. The illuminator of claim 1, wherein at least one surface of the plurality of surfaces is formed of a polymer film including at least two layers with different index of refractions.

15. The illuminator of claim 1, wherein the at least one surface comprising the first material includes a reflective coating.

16. A system comprising:

an illuminator including;

a reflective cavity comprising a plurality of surfaces, wherein at least one surface of the plurality of surfaces is formed of a first material configured to reflect at least 70% of ultraviolet radiation, and at least one surface of the plurality of surfaces is formed of a second material configured to transmit at least 30% of the ultraviolet radiation through the second material and out of the reflective cavity and reflect at least 10% of the ultraviolet radiation, wherein the at least one surface formed of the second material includes non-uniform random nano-patterning;

a set of ultraviolet radiation sources, wherein at least one ultraviolet radiation source is located adjacent to a side surface of the reflective cavity and configured to generate ultraviolet radiation; and

at least one parabolic mirror located adjacent to the side surface of the reflective cavity and the at least one ultraviolet radiation source;

a feedback component including a sensor configured to acquire fluorescence data corresponding to fluorescent visible radiation emitted from a surface radiated by the illuminator; and

a computer system for operating the plurality of ultraviolet radiation sources based on the fluorescence data.

17. The system of claim 16, wherein the sensor includes a fluorescent optical camera.

18. A system comprising:

an illuminator including;

a reflective cavity comprising a plurality of surfaces, wherein at least one surface of the plurality of surfaces is formed of a first material configured to reflect at least 70% of ultraviolet radiation, and at least one surface of the plurality of surfaces is formed of a second material configured to transmit at least 30% of the ultraviolet radiation through the second material and out of the reflective cavity and reflect at least 10% of the ultraviolet radiation, wherein the at least one surface formed of the second material includes non-uniform random nano-patterning;

a set of ultraviolet radiation sources, wherein at least one ultraviolet radiation source is located adjacent to a side surface of the reflective cavity and configured to generate ultraviolet radiation; and

at least one parabolic mirror located adjacent to the side surface of the reflective cavity and the at least one ultraviolet radiation source; and

a computer system for operating the plurality of ultraviolet radiation sources, the computer system including an external interface component configured to receive a user input to adjust a set of parameters for the ultraviolet radiation.

19. The system of claim 18, wherein the set of parameters for the ultraviolet radiation includes an intensity, a duration, and a spectral peak wavelength for the ultraviolet radiation.

20. The system of claim 18, further comprising a partially transparent, partially reflective mesh located within the reflective cavity configured to diffusively reflect the ultraviolet radiation, wherein at least one ultraviolet radiation source in the set of ultraviolet radiation sources is located on the partially transparent, partially reflective mesh.