- Title
- A light-emitting-diode pulsing system for measurement of time-resolved luminescence
- Creator
- Uriri, Solomon Akpore
- ThesisAdvisor
- Chithambo, Makaiko L
- Date
- 2015
- Type
- Thesis
- Type
- Masters
- Type
- MSc
- Identifier
- vital:20976
- Identifier
- http://hdl.handle.net/10962/5788
- Description
- A new light-emitting-diode based pulsing system for measurement of time-resolved luminescence has been developed. The light-emitting-diodes are pulsed at various pulse-widths by a 555-timer operated as a monostable multivibrator. The light-emitting-diodes are arranged in a dural holder connected in parallel in sets of four, each containing four diodes in series. The output pulse from the 555-timer is fed into an 2N7000 MOSFET to produce a pulse-current of 500 mA to drive the set of 16 light-emitting-diodes. This size of current is sufficient to drive the diodes with each driven at a pulse-current of 90 mA with a possible maximum of 110 mA per diode. A multichannel scaler is used to trigger the pulsing system and to record data at selectable dwell times. The system is capable of generating pulse-widths in the range of microseconds upwards.
- Format
- 104 leaves, pdf
- Publisher
- Rhodes University, Faculty of Science, Physics and Electronics
- Language
- English
- Rights
- Uriri, Solomon Akpore
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RU Department of Physics and Electronics
| Thumbnail | File | Description | Size | Format | |||
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| View Details | SOURCE1 | 12 MB | Adobe Acrobat PDF | View Details |