Investigation of Uniform Illumination of Near-Field Targets Using a Conic Light-Emitting Diode Array

Qilu, 黄启禄 Huang; Fengtie, 吴逢铁 Wu

doi:10.3788/aos20103010.3039

Cited by 4 publications

(3 citation statements)

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“…Therefore, the author chooses the LED array as the reflected light source of the detection device. In a narrow space, multiple LED lamp beads are often arranged in an array to obtain sufficient illumination brightness and illumination uniformity [8][9]. In view of the structural requirements of fast detection device of lube oil wear debris, an LED array consists of eight 0805 SMD LED lamp beads, which evenly arranged in a loop, was selected as the reflective light source of the device, as shown in Figure 2(a), while the illuminance distribution of the LED array, which is on a parallel plane to the array, is shown in Figure 2 Based on the device structure, the effective radii l of the 8-LED array reflective light source is taken as 13mm, 14mm, and 16mm [10], respectively, and the illuminance distribution curve of the light-receiving surface is shown in Figure 3.…”

Section: Analysis Of Led Array Structurementioning

confidence: 99%

Illumination analysis and optimization for a fast detection device of lube oil wear debris

Hong

Fan

Feng

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

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With the development of large-scale wear debris, the demand for condition monitoring of mechanical devices increases accordingly. The fast detection device of lube oil wear debris is intended for the mechanical equipment lubricated with grease, collecting information on the abrasive particles in the equipment lubricating grease, and consequently monitor the status of the equipment. The rapid detection device needs a fitting lighting environment to collect the abrasive particle information; therefore, it is necessary to research into the lighting system of the fast detection device.

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Section: Analysis Of Led Array Structurementioning

confidence: 99%

Illumination analysis and optimization for a fast detection device of lube oil wear debris

Hong

Fan

Feng

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

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“…) According to the physical significance of the illumination distribution and the law of Spyro, the first and the second derivative of Eq.4 must be zero [10].…”

Section: Optimization Of Led Lights Spacementioning

confidence: 99%

Design of LED Light Source for Uniform Illumination in Large Area

Sun

Zhang

2013

AMM

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Based on the observation of the data measured, the illumination distribution of single LED is set to follow Gaussian function, and with this hypothesis, two forms of light array are analyzed on their illumination distribution. The law of Spyro is used to optimize space between LED in array. Comparison and analysis of the two kinds of array arrangement are given for getting the uniform illumination. The general design method and the calculation example of LED array to produce uniform illumination are also given in this paper. Keywords: Plane light source, Gauss function fitting, LED light source, Uniform illumination

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“…The perceived illumination uniformity depends on the factors such as the distance from the observed surface to the target field, the optical models of the light sources, background luminance, and reflectance, pattern and color of target. Typically, a single LED is optically modeled on realistic numerical models or on measurementbased models [7][8][9][10] . Among them, Moreno proposed approximate Lambertian models to achieve uniform irraduance distribution efficiently [11,12] .…”

mentioning

confidence: 99%

A precise model of LED lighting and its application in uniform illumination system

Huang

2011

Optoelectron. Lett.

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Tianjin University of Technology and Springer-Verlag Berlin Heidelberg 2011 C Optical models directly effect the irradiance distribution of observed surface. Traditionally, approximate Lambertian models are widely used in designing the light-emitting diodes (LED) arrays in spite of their errors compared with the experimental data. But now a novel LED optical model for uniform illumination system has been proposed, in which the curvefitting technique is used to reduce the inherited errors and modify those previous models. The points from the curve of the LED light intensity are adopted, and a spline curve is designed for fitting, which obtains the revised mode. To verify its feasibility, we apply the new model in a 4 4 array design. The results show that compared with the approximate Lambertian, the light intensity distribution produced by the fitting model is more uniform and intense, as is expected.Light-emitting diodes (LEDs) lighting, with merits of saving energy, longer life and environment protection, has a wide application foreground. As an important technique innovation for lighting LEDs will replace the traditional incandescent, fluorescent and gas discharge lamps, and become dominant in lighting market in the foreseeable future. LEDs have many favorable characteristics, including small volume, lower power consumption, instant power-on capacity, and absence of mercury or any other form of toxic substance [1][2][3] . For the improvements in the luminous flux, LEDs are used in new applications, such as indoor plant cultivation [4] , displays [5] and biomedicine [6] . However, though the luminous flux of every modern high-power LED is up to 150 lm, several LEDs cannot produce a practical power without permutation and combination. Therefore, the arrangement of the LED must be designed reasonably, otherwise it will cause glare and wasted energy. The perceived illumination uniformity depends on the factors such as the distance from the observed surface to the target field, the optical models of the light sources, background luminance, and reflectance, pattern and color of target. Typically, a single LED is optically modeled on realistic numerical models or on measurementbased models [7][8][9][10] . Among them, Moreno proposed approximate Lambertian models to achieve uniform irraduance distribution efficiently [11,12] . Using these models, we are able to obtain parameters, which provide the maximum LED density and the minimum LED-to-detector distance for different LED arrays, which produce satisfactory uniformity.However, it is doubtful that the irradiance distribution of the model used in approximate Lambertian is consistent with the actual LED or not. And we did find certain deviations by comparing the irradiance distributions of approximate Lambertian model and actual LED. In this paper, we propose a new model, which uses curve fitting method to amend the LED luminescent model. The model is not only useful in LED lighting design, but also helpful in package design. The optical simulation of LED arrays by rele...

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Investigation of Uniform Illumination of Near-Field Targets Using a Conic Light-Emitting Diode Array

Cited by 4 publications

References 0 publications

Illumination analysis and optimization for a fast detection device of lube oil wear debris

Illumination analysis and optimization for a fast detection device of lube oil wear debris

Design of LED Light Source for Uniform Illumination in Large Area

A precise model of LED lighting and its application in uniform illumination system

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