US 12,247,881 B2
Apparatus and method for measuring far-field luminous intensity and color characteristics of light sources
Michael Piscitelli, Pineville, NC (US)
Assigned to Sapphire IP, Inc., Pineville, NC (US)
Filed by Sapphire IP, Inc., Pineville, NC (US)
Filed on Feb. 9, 2021, as Appl. No. 17/171,458.
Claims priority of provisional application 63/069,872, filed on Aug. 25, 2020.
Prior Publication US 2022/0065698 A1, Mar. 3, 2022
Int. Cl. G01J 3/50 (2006.01); G01J 1/44 (2006.01); G02B 5/10 (2006.01)
CPC G01J 3/505 (2013.01) [G01J 1/44 (2013.01); G02B 5/10 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An apparatus for measuring far-field luminous intensity and color characteristics of a light source, the apparatus comprising:
a frame, wherein the frame internally comprises:
a horizontal lamp test location within the frame for receiving a lamp for testing, wherein the lamp is positioned at the lamp test location within the frame for reflecting a light beam from the lamp at a predetermined angle;
a parabolic mirror positioned in a fixed light receiving position relative to the lamp test location and positioned in a fixed light transmitting position for reflecting the light beam from the lamp at a predetermined angle relative to the light receiving position;
a measurement screen positioned in a location relative to the parabolic mirror to receive the parabolically-condensed light image reflected from the parabolic mirror at the predetermined angle;
a camera positioned to capture a light image reflected from the measurement screen, the camera configured to convert the reflected light image on the measurement screen to a digital signal and output the digital signal; and
a light detector configured for receiving and processing the digital signal corresponding to the reflected light image and calibrated for measuring luminous intensity according to an algorithm programmed by a computer.