Multi-channel light sensor

• US 10,502,617 B2
• Filed: 05/15/2017
• Issued: 12/10/2019
• Est. Priority Date: 05/16/2016
• Status: Active Grant

• Current Assignee: Zumtobel Lighting Inc. (Zumtobel Group AG)
• Original Assignee: Zumtobel Lighting Inc. (Zumtobel Group AG)
• Inventors: Jonsson, Karl
• Primary Examiner(s): Lee, John R
• Application Number:
  US15/595,293
• Publication Number:
  US 20170328765A1
• Time in Patent Office: 939 Days
• CPC Class Codes: G01J 1/029 Multi-channel photometry
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G01J 1/4228 arrangements with two or more detectors, e.g. for sensitivity compensation
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The present invention provides a multi-channel light sensor comprising a fragmented lens and a camera sensor; wherein the fragmented lens comprises lens elements; and wherein each lens element comprises an own optical axis and is adapted to direct light from a spatial area onto the camera sensor such that the light intensities of different spatial areas are spatially resolved on the camera sensor. Furthermore, a system is provided, which comprises at least one such multi-channel light sensor, at least one lighting device, and a light management device; wherein the light management device is adapted to receive the light intensities of the different spatial areas from the multi-channel light sensor; and wherein the light management device is adapted to control the at least one lighting device on the basis of the light intensities of the different spatial areas.

Claims

1. Multi-channel light sensor (2) adapted to detect a plurality of different light intensities comprising

a) a fragmented lens (3), and

b) a camera sensor (5) adapted to detect visible light;

c) wherein the fragmented lens (3) comprises lens elements (4); and

d) wherein each lens element (4) is adapted to direct visible light from a spatial area onto the camera sensor (5) such that the light intensities of different spatial areas are spatially resolved on the camera sensor (5),

wherein the lens elements each have a different optical axis, so that they direct the light from different spatial areas to different corresponding areas of the camera sensor,

wherein the fragmented lens (3) is a Fresnel lens, and wherein the lens elements (4) correspond to different sections of the Fresnel lens.

2. Multi-channel light sensor (2) according to claim 1, wherein the camera sensor (5) comprises an array of photodiodes and/or an array of photoresistors.

3. Multi-channel light sensor (2) according to claim 1, wherein the camera sensor (5) corresponds to a black and white camera sensor.

4. Multi-channel light sensor (2) according to claim 1, wherein the camera sensor (5) corresponds to a color image sensor, such that the camera sensor (5) is adapted to detect spectral information of the light of the different spatial areas.

5. Multi-channel light sensor (2) according to claim 1, wherein the multi-channel light sensor (2) comprises a controller (6) that is adapted to store the light intensities of the different spatial areas and/or to communicate the light intensities of the different spatial areas to a networked system.

6. System (1) comprising

a) at least one multi-channel light sensor (2) according to claim 1,

b) at least one lighting device (8), and

c) a light management device (7);

d) wherein the light management device (7) is adapted to receive the light intensities of the different spatial areas from the at least one multi-channel light sensor (2); and

e) wherein the light management device (7) is adapted to control the at least one lighting device (8) on the basis of the light intensities of the different spatial areas.

7. System (1) according to claim 6, wherein the light management device (7) is adapted to use an algorithm to interpret the light intensities received from the at least one multi-channel light sensor (2).

8. System (1) according to claim 6, wherein the light management device (7) is adapted to control the at least one lighting device (8) by comparing the light intensities of the different spatial areas received from the at least one multi-channel light sensor (2).

9. System (1) according to claim 6, wherein the light management device (7) is adapted to control the at least one lighting device (8) on the basis of spectral information of the light of the different spatial areas received from the at least one multi-channel light sensor (2).

10. System (1) according to claim 6, wherein the light management device (7) is adapted to determine the environment around the at least one multi-channel light sensor (2) by comparing the light intensities of the different spatial areas received from the at least one multi-channel light sensor (2).

11. System (1) according to claim 6, wherein the light management device (7) is adapted to determine the environment around the at least one multi-channel light sensor (2) by comparing the light intensities of neighboring spatial areas received from the at least one multi-channel light sensor (2).

12. System (1) according to claim 6, wherein the light management device (7) is adapted to determine contextual information about the environment around the at least one multi-channel light sensor (2) on the basis of spectral information of the light of the different spatial areas received from the at least one multi-channel light sensor (2).

13. System (1) according to claim 6,

a) wherein the system comprises a plurality of lighting devices (8);

and

b) wherein the light management device (7) is adapted to identify one of the plurality of lighting devices (8) and/or to determine the correlation between at least two lighting devices (8) of the plurality of lighting devices (8) on the basis of the light intensities of the different spatial areas received from the at least one multi-channel light sensor (2).

14. System (1) according to claim 13, wherein the light management device (7) is adapted to identify one of the plurality of lighting devices (8) and/or to determine the correlation between at least two lighting devices (8) of the plurality of lighting devices (8) by controlling the lighting devices (8) to flash and sampling the light intensities of the different spatial areas received from the at least one multi-channel light sensor (2).

15. System (1) according to claim 7, wherein the algorithm is a Visual Light Communication (VLC) algorithm.