# US 12,764,840 B2 · Method for detecting and processing photometric parameters of lighting devices, and corresponding computer program product and controller > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,764,840 B2 - Document ID: US12764840B2 - Status: Granted - Kind: B2 - Application number: 18/857,256 - Filed: 2023-03-27 - Published: 2025-08-28 - Granted: 2026-10-13 - Earliest claimed: 2022-04-21 - Assignees: Clay Paky S.p.A. - Applicants: Clay Paky S.r.l. - Inventors: Alberto Alfier; Xiaolong Li; Andrea Morra; Massimiliano Pesenti; Massimo Callegari - Web page: https://patentgrep.com/patent/US12764840B2 ## CPC - H05B 45/22: using optical feedback - G01J 1/4257: {applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam (monitoring arrangements for lasers in general H01S3/0014)} - G01J 1/44: Electric circuits {(for command of an exposure part G03B7/02)} - G01J 2001/4247: {for testing lamps or other light sources} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract Photometric calibration data for lighting devices that include a plurality of electrically powered light radiation sources are obtained by positioning a photometric sensor configured to be impinged upon by light radiation emitted by a lighting device. There is detected, via the sensor and with the device deactivated, a background lighting level signal. There are then detected, via the sensor and with the device activated, light-emission signals, which are processed on the basis of the background-lighting level signal to obtain clean emission signals. The photometric calibration data are produced starting from said clean emission signals and can be used both for (re)calibrating the emission parameters of the same lighting device with respect to which the sensor has been positioned and for modifying the light emission parameters of one or more cloned lighting devices other than the lighting device with respect to which the sensor has been positioned. ## Claims ### Claim 1 A method for producing photometric calibration data for a lighting device comprising a plurality of electrically powered light-radiation sources having respective light emission parameters, the method comprising: positioning a photometric sensor configured to be impinged upon by light radiation emitted by said lighting device; detecting, via the photometric sensor and with said lighting device de-activated, a background lighting level signal; detecting, via the photometric sensor with said lighting device activated, light-emission signals; processing said light-emission signals based on said background lighting level signal, and obtaining clean emission signals as a result; producing said photometric calibration data based on said clean emission signals; detecting, via the photometric sensor with said lighting device activated, at least one preliminary light-emission signal; processing said at least one preliminary light-emission signal based on said background lighting level signal, and obtaining at least one preliminary clean emission signal as a result; and calculating, based on said at least one preliminary clean light emission signal and said background lighting level signal, at least one signal-to-noise ratio selected among global signal-to-noise ratios over a visible light spectrum and signal-to-noise ratios over respective emission spectra of the plurality of electrically powered light radiation sources included in said lighting device with respect to which the photometric sensor has been positioned to be impinged upon by light radiation. ### Claim 2 (depends on 1) The method of claim 1, further comprising, in response to all the signal-to-noise ratios calculated reaching respective acceptability thresholds, proceeding with detecting, via the photometric sensor with said plurality of electrically powered light radiation sources selectively activated, respective light emission signals. ### Claim 3 (depends on 1) The method of claim 1, further comprising, in response to at least one of the signal-to-noise ratios calculated failing to reach a respective acceptability threshold, increasing an intensity of light radiation impinging on the photometric sensor with respect to said background lighting level. ### Claim 4 (depends on 1) The method of claim 1, further comprising obtaining said at least one preliminary clean emission signal by subtracting said background lighting level signal from said at least one preliminary emission signal. ### Claim 5 (depends on 1) The method of claim 1, further comprising calculating said at least one signal-to-noise ratio selected from global signal-to-noise ratios over the visible light spectrum and signal-to-noise ratios over respective emission spectra of the plurality of electrically powered light radiation sources and converting said at least one clean preliminary signal and said background lighting level signal into quantitative colorimetric values, including illuminance values. ### Claim 6 (depends on 1) The method of claim 1, further comprising, in a calibration data measuring phase: activating for a warm-up interval the plurality of electrically powered light radiation sources included in said lighting device with respect to which the photometric sensor has been positioned to be impinged upon by light radiation, detecting, via the photometric sensor with said plurality of electrically powered light radiation sources selectively activated, at an end of said warm-up interval, respective light emission signals, processing said respective light emission signals based on said background lighting level signal, and obtaining respective clean emission signals as a result, and producing said photometric calibration data based on said respective clean emission signals. ### Claim 7 (depends on 6) The method of claim 6, further comprising obtaining said respective clean emission signals by subtracting said background lighting level signal from said respective light emission signals. ### Claim 8 (depends on 6) The method of claim 6, further comprising obtaining said respective clean emission signals by converting said respective light emission signals and said background lighting level signal into quantitative colorimetric values, including illuminance values. ### Claim 9 (depends on 6) The method of claim 6 further comprising, in response to detecting that said photometric sensor has reached a saturation threshold, reducing an intensity of the light radiation impinging on the photometric sensor. ### Claim 10 (depends on 1) A computer program product comprising software code that can be executed in a processor device using the method according to claim 1, coupled to the lighting device comprising the plurality of electrically powered light radiation sources having respective light emission parameters and the photometric sensor positioned with respect to the lighting device to be impinged upon by light radiation emitted by said lighting device, wherein, when the product is executed on said processor device, the processor device performs said operations of detecting the background lighting level signal, detecting light emission signals, processing said light emission signals based on said background lighting level signal, and producing said photometric calibration data based on said clean emission signals. ### Claim 11 (depends on 10) A processor device configured to execute the computer program product according to claim 10 with the processor device coupled to the lighting device comprising the plurality of electrically powered light radiation sources having respective light emission parameters and the photometric sensor positioned with respect to the lighting device to be impinged upon by light radiation emitted by said lighting device. ### Claim 12 (depends on 10, 11) The processor device of claim 11, wherein the processor device is configured to be remotely uploaded with the computer program product according to claim 10.