A Far Field Measurement System Design for Light Emitting Devices

Abstract:

The key point of the proposed LED (light emitting device) optical field measurement system is to place the packaged or unpackaged LED on a stepping motor without any translation parts. Thus the mechanical aging effect and the maintenance problems of the traditional rotary part are avoided. Besides, the measurement sensors are fixed along a quarter arc of a circle with the LED at the center, so they can take both spectrum and energy output measurements along various aspect angles. The system has thirteen photo detector modules forming a 90° arch with a diameter of 63.2cm. Each module comprises eight photo-detectors, and each detector covers 0.9°. A stepping motor, placed at the center of the circle, rotates a LED under test through 360°with a step size of 1.8°. A powerful micro-controller (C8051-F020) is employed to control the 3-dimensional far field measurement flow for the data acquisition that bridges the photo-detector array modules and a personal computer. The communication between the personal computer and the data acquisition sub-system is through a RS232 interface. A fast, reliable, user-friendly measurement system has been achieved.

• Periodical: Advanced Materials Research (Volumes 765-767)
• Pages: 2144-2147
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.765-767.2144
• Online since: September 2013
• Authors: Jium Ming Lin, Cheng Hung Lin
• Keywords: Far Field Measurement System, Goniometry, Light Beam Diagnostics, Photo Diode Detector, Spectrometer

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