Performance metrics for integrated lighting systems

Jannson, Tomasz; Arık, E.; Bennahmias, M.; Nathan, Nanda; Wang, Sam C.; Lee, Kang; Yu, Kegen; Poliakov, Evgeni Y.

doi:10.1117/12.663349

Cited by 7 publications

(1 citation statement)

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“…In subjective units (Lumens instead of Watts), brightness, B, is called luminance [9] , in Lm/m 2 Str., or in Cd/m 2 = 1 nt. It is very useful to introduce so-called generalized Lambertian sources [7,8,10,11] that satisfy the relation in the form of a generalized Lambert law:…”

Section: Brightnessmentioning

confidence: 99%

System-on-chip-centric unattended embedded sensors in homeland security and defense applications

et al. 2009

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System-on-chip (SoC) single-die electronic integrated circuit (IC) integration has recently been attracting a great deal of attention, due to its high modularity, universality, and relatively low fabrication cost. The SoC also has low power consumption and it is naturally suited to being a base for integration of embedded sensors. Such sensors can run unattended, and can be either commercial off-the-shelf (COTS) electronic, COTS microelectromechanical systems (MEMS), or optical-COTS or produced in house (i.e., at Physical Optics Corporation, POC). In the version with the simplest electronic packaging, they can be integrated with low-power wireless RF that can communicate with a central processing unit (CPU) integrated in-house and installed on the specific platform of interest. Such a platform can be a human body (for e-clothing), unmanned aerial vehicle (UAV), unmanned ground vehicle (UGV), or many others. In this paper we discuss SoC-centric embedded unattended sensors in Homeland Security and military applications, including specific application scenarios (or CONOPS). In one specific example, we analyze an embedded polarization optical sensor produced in house, including generalized Lambertian lightemitting diode (LED) sources and secondary nonimaging optics (NIO).

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Section: Brightnessmentioning

confidence: 99%

System-on-chip-centric unattended embedded sensors in homeland security and defense applications

et al. 2009

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Investigative photometry experiments on planar extended-light sources

Campione,

Pietropaolo,

Bussetti

2024

Eur. J. Phys.

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The inverse-square decay law of illuminance of a point light source with distance is a common notion of basic optics theory, which is readily demonstrated to be a direct consequence of the propagation of spherical wave fronts with centre at the light source. It is far less common to address the experimental verification of this law and, even less, to study the illuminance decay with distance of extended light sources, which represent somehow an unknown topic. We propose a scientific experiment where the light sensor of a smartphone is used to collect illuminance data as a function of the source-to-sensor distance and orientation. Through this procedure, students can realize the limit of validity of the inverse-square law and determine the luminance flux of the chosen point-like light source (e.g. the white LED flashlight of a smartphone). More interestingly, when dealing with extended sources (e.g. the LCD of a laptop displaying a white image) subtle characteristics of the decay trend emerge, particularly for distances lower that the source size. A detailed analysis of these characteristics is presented though a process allowing student engagement in a real scientific investigation, envisaging steps of data acquisition through experimental measurements, model construction on the basis of the observed patterns, and finally model testing. We provide a guided formulation for the general modelling of planar emitters, starting from the theoretical treatment of Lambertian sources. In this way, students are able to quantify the luminous emission also for extended sources and their deviation from a Lambertian behaviour.

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