7-11 July 2014
Africa/Johannesburg timezone
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The design of a light-emitting-diode pulsing system for measurement of time-resolved luminescence

Presented by Mr. Solomon A. URIRI on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track F - Applied Physics
Board #: F.33

Abstract

A new light-emitting-diode (LED) pulsing system for measurement of time-resolved luminescence will be presented. The system has been designed for use with a set of blue light-emitting diodes as the stimulation light source. The LEDs are pulsed at various pulse width by signals from a 555-timer wired as a monostable multivibrator. The output pulse from the 555-timer is fed into an N7000 MOSFET to produce a pulse current of 500 mA to drive a set of 16 LEDs. This amount of current is sufficient to drive four sets of 4 LEDs with each LED driven at a maximum pulse current of 110 mA. A multichannel scaler (Ortec MCS-plus<sup>TM</sup>) is used to trigger the pulsing system and to record data at selectable dwell times. The system is designed for use on wide band gap insulators.

Award

Yes

Level

MSc

Supervisor

Makaiko L. Chithambo. M.Chithambo@ru.ac.za / Rhodes University, PO BOX 94,Grahamstown 6140, South Africa

Paper

yes

Place

Room: D Ring ground level


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