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公开(公告)号：USRE49479E1
公开(公告)日：2023-03-28
申请号：US16033917
申请日：2018-07-12
摘要： An illumination device and method is provided herein for calibrating individual LEDs and photodetector(s) included within the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over time as the LEDs age. Specifically, a calibration method is provided herein for characterizing each emission LED and each photodetector separately. The wavelength and intensity of the illumination produced by each emission LED is accurately characterized over a plurality of different drive currents and ambient temperatures, and at least a subset of the wavelength and intensity measurement values are stored with a storage medium of the illumination device for each emission LED. The responsivity of the photodetector is accurately characterized over emitter wavelength and photodetector junction temperature, and results of said characterization are stored with the storage medium.
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公开(公告)号：US20220167479A1
公开(公告)日：2022-05-26
申请号：US17669976
申请日：2022-02-11
发明人： Horace C. Ho , Jason E. Lewis , David J. Knapp
IPC分类号： H05B47/10 , G01J3/46 , G01J3/50 , G01J1/02 , G01J3/02 , H05B45/22 , H05B45/24 , H05B47/24 , H05B47/21 , H05B45/12 , G01J1/32 , G01J1/42 , G01R31/44
摘要： An illumination device and method are provided herein for calibrating individual LEDs in the illumination device to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.
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公开(公告)号：US11252805B2
公开(公告)日：2022-02-15
申请号：US16819497
申请日：2020-03-16
发明人： Horace C. Ho , Jason E. Lewis , David J. Knapp
IPC分类号： H05B47/10 , G01J1/32 , G01J3/46 , G01J3/50 , G01J1/02 , G01J3/02 , H05B45/22 , H05B45/24 , H05B47/24 , H05B47/21 , H05B45/12 , G01J1/42 , G01R31/44 , G01J1/44 , H05B47/105 , H05B45/18
摘要： An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.
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