On overcoming photodetector saturation due to background illumination while maintaining high sensitivity by means of a tailored CMOS pixel

Belmonte, Pablo Nunes Agra; Chaves, Lucas Martins; Torres, Frank Sill; Monteiro, Davies William de Lima

doi:10.23919/glc.2018.8319099

Cited by 2 publications

(1 citation statement)

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“…On the other hand, integrating a light sensor inside an LED lamp is a challenge, as the high flux level of LED can easily saturate nearby photo sensors. Several topologies have been suggested to overcome this problem [7][8][9], but anyway they still require to optically shield the sensor from the LEDs, and this is not practical in compact lamps. Moreover, having a light sensor inside the lamp is not sufficient to achieve luminance control, as the control system is now distributed among all the lamps, and communication is thus needed to guarantee stability of the control scheme.…”

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confidence: 99%

Integrated Light Sensing and Communication for LED Lighting

Roch

Martina

2018

Designs

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Solid state lighting is nowadays widely diffused both in residential and office or industrial environment. Ambient light sensing to modulate lamp power is typical too, but sensors inside a lamp are a challenge, due to the high flux of these sources, which easily saturates nearby light detectors. Usually, separate sensing devices must be introduced in the system, thus increasing complexity and cost. In this work, a methodology will be presented, to allow integration of a light sensing device inside a lamp, using low cost circuitry to mitigate interactions between high power light-emitting diode (LED) sources and sensing photodiodes. Moreover, the same circuit allows visual light communication among sources.

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confidence: 99%