Tegnieke vir die verbetering van die akkuraattieid van frekwensiemetings op protonpresessieseine
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie/South African Journal of Science and Technology
| Field | Value | |
| Title | Tegnieke vir die verbetering van die akkuraattieid van frekwensiemetings op protonpresessieseine Techniques for improving the accuracy of frequency measurements on proton precession signals | |
| Creator | Office, Editorial | |
| Description | Hierdie projek het eerstens ten doel die ondersoek van die rol van weegfaktore by die kleinste-kwadraatfout-metode, soos aangewend vir die bepaling van die frekwensie van ’n proton- presessiesein. Tweedens is ’n demodulasieproses ingevoer om ’n eenvoudiger en goedkoper meetbaan te verkry wat 'n beter akkuraatheid lewer met relatief minder kompleksiteit. A statistical data processing technique has been implemented by which a significant improvement in accuracy can be achieved when measuring the frequency of noisy sinusoidal signals with an exponential amplitude decay as is the case with free proton precession signals (originating from a proton magnetometer sensor), where the highest accuracy is desired for the shortest observation time. A least square error curve fit method was used and weighing factors were introduced to compensate for the exponential decay of the signal into the noise floor. Additionally, a hardware demodulation process was implemented, enabling a higher quantizing accuracy to be achieved using the same frequency counter clock. Both techniques were realised with appropriate hardware and software and the results confirm the improvement in accuracy. | |
| Publisher | AOSIS | |
| Date | 1996-07-11 | |
| Identifier | 10.4102/satnt.v15i4.652 | |
| Source | Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 15, No 4 (1996); 174-177 Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 15, No 4 (1996); 174-177 2222-4173 0254-3486 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://journals.satnt.aosis.co.za/index.php/satnt/article/view/652/1183
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