LED Array Design with Image Based Planar Verification

Aparna Murthy

Goal of this work is to design an illumination array that ensures uniformity of light field. The array design is simulated using a non-sequential ray trace tool. This tool provides illumination measurements using charts of intensity variation that is quantified in a hemispherical or a spherical volume. The sphere acts as a receiver surface to compute the spread of light field and to determine the corresponding radiometric value. The spherical radius of this receiver can be varied to obtain collection efficiency at certain distances. Prototype of the array is optimized considering the electro-optical and physical constraints of the light emitting diodes. A planar uniformity is verified from captured images. The illumination of chess board pattern provides a statistically measure for comparison. The intensity gradients are extracted using edge processing operators. The binary map of edges provides a numerical value of intensity transitions for a given arrangement of sources. Using near infrared sources organic samples is imaged to make inferences under low light conditions.

Select Volume / Issues:

• Volume 6,Issue 5, Sept. 2015

Year:

2015

Type of Publication:

Article

Keywords:

Cylindrical coordinates; Diffusive; Edge Statistics; Radiometry

Journal:

IJECCE

Volume:

6

Number:

5

Pages:

565-571

Month:

September