Infrared light module uniformity rotational test module
Example embodiments described herein involve a system for testing a light-emitting module. The light-emitting module may include a mounting platform configured to hold a light-emitting module for a camera. The mounting platform may also be configured to rotate. The system may further include a housing holding a plurality of photodiodes arranged in an array over at least a 90 degree arc of a hemisphere. The system may also include a controller configured to control the photodiodes and the rotation of the mounting platform.
1. A method for testing a light-emitting module comprising:
emitting light from a light-emitting module while rotating the light-emitting module around an axis, wherein the light-emitting module is in a housing configured to block external light;
sensing, with a plurality of photodiodes in the housing, a plurality of directional light intensities of the light emitted from the light-emitting module; and
outputting a light distribution map based on the directional light intensities.
2. The method of claim 1 , further comprising positioning the light-emitting module in the housing, wherein the light-emitting module is a light-emitting module for a camera.
3. The method of claim 2 , wherein positioning the light-emitting module in the housing comprises positioning the light-emitting module at a center of an arc on which the photodiodes are arranged.
4. The method of claim 3 , wherein the axis intersects the arc on which the photodiodes are arranged.
5. The method of claim 3 , wherein the photodiodes are positioned in an array on the arc within the housing.
6. The method of claim 1 , wherein the light-emitting module faces the plurality 6 , of photodiodes.
7. The method of claim 1 , wherein rotating the light-emitting module around the axis comprises rotating the light-emitting module through an angular range around the axis, wherein the angular range is between 0 degrees and 360 degrees.
8. The method of claim 7 , wherein the light-emitting module rotates at predefined increments.
9. The method of claim 1 , wherein as the light-emitting module rotates around the axis, the plurality of photodiodes sense the directional light intensities simultaneously at predefined positions during a plurality of rotations of the light-emitting module.
10. The method of claim 1 , wherein outputting the light distribution map based on the directional light intensities comprises compiling the plurality of directional light intensities into a light pattern.
11. The method of claim 10 , wherein the light distribution map covers at least a portion of a three-dimensional hemisphere.
12. The method of claim 1 , wherein the housing is configured to block external light from reaching the light-emitting module.
13. A method for calibrating a light-emitting module tester comprising:
emitting light from a control light source while rotating the control light source around an axis, wherein the control light source is in a housing configured to block external light;
sensing, with a plurality of photodiodes in the housing, a plurality of directional light intensities of the control light source; and
outputting a light distribution map based on the directional light intensities.
14. The method of claim 13 , further comprising positioning the control light source in the housing.
15. The method of claim 13 , wherein the housing is configured to block external light from reaching the control light source.
16. The method of claim 13 , wherein the plurality of photodiodes are in an array on an arc within the housing.
17. The method of claim 13 , wherein the control light source faces the plurality of photodiodes.
18. The method of claim 13 , wherein the plurality of photodiodes include a plurality of bandpass filters configured to reduce a range of light intensity that the plurality of photodiodes sense.
19. The method of claim 13 , further comprising comparing an intensity of the control light source to the plurality of directional light intensities sensed with the photodiodes.
20. The method of claim 19 , further comprising determining there is an error in photodiode operation based on a difference in the comparison of the intensity of the control light source to the plurality of directional light intensities sensed with the photodiodes.