Ultraviolet diffusive illumination

• US 10,245,338 B2
• Filed: 12/21/2016
• Issued: 04/02/2019
• 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:
  US15/387,583
• Publication Number:
  US 20170095585A1
• Time in Patent Office: 832 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. A system comprising:

an illuminator including;

a reflective cavity comprising a plurality of surfaces, wherein at least one of the plurality of surfaces is formed of a first material configured to reflect at least 70% of ultraviolet radiation, wherein the first material is patterned to include a plurality of diffusive elements, and wherein at least one 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;

a plurality of ultraviolet radiation sources located within the reflective cavity; and

a set of optical elements located within the reflective cavity and configured to distribute the ultraviolet radiation within the cavity before the ultraviolet radiation exits the reflective cavity through the second material, wherein each optical element is located a distance away from an ultraviolet radiation source, and wherein the distance is approximately equal to a diameter of the corresponding ultraviolet radiation source and is configured to increase uniformity of the ultraviolet radiation exiting the reflective cavity;

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.

2. The system of claim 1, wherein the first material is configured to diffusively reflect the ultraviolet radiation.

3. The system of claim 1, wherein the plurality of ultraviolet radiation sources are mounted on a mounting mesh located within the reflective cavity.

4. The system of claim 3, wherein the mounting mesh is configured to reflect at least 70% of the ultraviolet radiation into the reflective cavity.

5. The system of claim 4, wherein the mounting mesh diffusively reflects the radiation.

6. The system of claim 3, wherein the mounting mesh is configured to transmit at least 70% of the ultraviolet radiation into the reflective cavity.

7. The system of claim 1, wherein the second material comprises fluoropolymer.

8. The system of claim 1, wherein the second material includes patterning forming a plurality of openings.

9. The system of claim 8, wherein the plurality of openings have a pattern configured to improve a uniformity of an intensity of the ultraviolet radiation.

10. A system comprising:

an enclosure configured to contain an object for disinfection;

an illuminator located within the enclosure, the illuminator comprising

a reflective cavity comprising a plurality of surfaces, wherein at least one of the plurality of surfaces is formed of a first material configured to diffusively reflect at least 70% of ultraviolet radiation, wherein the first material is patterned to include a plurality of diffusive elements, and wherein at least one 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;

at least one ultraviolet radiation source configured to generate the ultraviolet radiation directed into the reflective cavity; and

a set of optical elements located within the reflective cavity and configured to distribute the ultraviolet radiation within the cavity before the ultraviolet radiation exits the reflective cavity through the second material, wherein each optical element is located a distance away from an ultraviolet radiation source, and wherein the distance is approximately equal to of a diameter of the corresponding ultraviolet radiation source and is configured to increase uniformity of the ultraviolet radiation exiting the reflective cavity;

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

a computer system for operating the at least one ultraviolet radiation source based on the fluorescence data.

11. The system of claim 10, wherein the set of optical elements includes a mesh located within the reflective cavity.

12. The system of claim 10, wherein the sensor includes a fluorescent optical camera.

13. The system of claim 10, wherein the fluorescence data includes data regarding a location of biological activity on the surface.

14. The system of claim 10, wherein the at least one ultraviolet radiation source includes a plurality of ultraviolet radiation sources independently operable by the computer system.

15. The system of claim 10, wherein the feedback component further includes a sensor configured to acquire operating data for the at least one ultraviolet radiation source.

16. An illuminator comprising:

at least one ultraviolet radiation source configured to generate ultraviolet radiation;

a reflective cavity comprising a plurality of surfaces, wherein the ultraviolet radiation is directed within the reflective cavity, wherein at least one of the plurality of surfaces is formed of a first material configured to diffusively reflect at least 70% of the ultraviolet radiation, and the diffusively reflected ultraviolet radiation is less than approximately 10% different from a diffusive Lambertian reflectivity for an angle of reflectance, wherein the first material is patterned to include a plurality of diffusive elements, and wherein at least one 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;

a set of optical elements located within the reflective cavity and configured to distribute the ultraviolet radiation within the reflective cavity before the ultraviolet radiation exits the reflective cavity through the second material, wherein each optical element is located a distance away from an ultraviolet radiation source configured to increase uniformity of the ultraviolet radiation exiting the reflective cavity, and wherein the distance is approximately equal to a diameter of the corresponding ultraviolet radiation source and is configured to increase uniformity of the ultraviolet radiation exiting the reflective cavity;

a feedback component including a sensor configured to acquire operating data for the at least one ultraviolet radiation source; and

a computer system for operating the at least one ultraviolet radiation source based on the operating data.

17. The illuminator of claim 16, wherein the feedback component further includes a sensor configured to acquire fluorescence data corresponding to fluorescent visible radiation emitted from a surface radiated by the illuminator, and wherein the computer system adjusts operating the at least one ultraviolet radiation source based on the fluorescence data.

18. The illuminator of claim 16, wherein the at least one ultraviolet radiation source includes a plurality of ultraviolet radiation sources independently operable by the computer system.

19. The illuminator of claim 16, wherein the second material includes patterning forming a plurality of openings having a pattern configured to improve a uniformity of an intensity of the ultraviolet radiation.

20. The illuminator of claim 16, further comprising a partially transparent, partially reflective mesh located within the reflective cavity configured to diffusively reflect the ultraviolet radiation.