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
Track: Track F - Applied Physics
Board #: F.33
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.
Makaiko L. Chithambo. M.Chithambo@ru.ac.za / Rhodes University, PO BOX 94,Grahamstown 6140, South Africa