Patent ID: 9474138
Filing Date: 2016-10-18
CPC Classification: G01J,G01M,H05B,Y02B

Claim Text:
1. A method of detecting a failed luminaire and/or light sensor in a lighting system comprising M luminaires and N light sensors, wherein the elements D sl of an N×M transfer matrix D expresses how each luminaire l affect a light sensor s with respect to sensed light intensity, wherein s=1, 2, . . . , N, and l=1, 2, . . . , M, and wherein each luminaire is controllable with respect to intensity of light emitted by the luminaire and each light sensor is adapted to sense intensity of light, the method comprising the steps of: setting the intensity of light emitted by the respective luminaires in the lighting system to a first intensity setting according to the respective elements of a first intensity vector I determining a first sensor intensity vector E setting the intensity of light emitted by the respective luminaires to at least a second intensity setting according to the respective elements of a second intensity vector I determining a second sensor intensity vector E determining fault detection vectors from a difference between E(1) and D·I E(2) and D·I identifying a failed luminaire and/or light sensor on basis of a difference between corresponding elements of the respective fault detection vectors.