9-13 July 2012
Africa/Johannesburg timezone
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Process Optimization Utilizing Adaptive Algorithms in a Closed Loop Feedback System

Presented by Mr. Attie HENDRIKS on 11 Jul 2012 from 16:50 to 17:10
Type: Oral Presentation
Session: Photonics
Track: Track C - Photonics

Abstract

We present molecular fragment optimization from parent molecules through the use of a combined optical and electronic closed loop feedback system. Shaped pulses are sent through a time-of-flight setup causing pre-ionization followed by fragmentation of parent molecules. Signal strengths for different fragments are evaluated and success in producing different fragments is determined by some target function. By now using an adaptive algorithm new pulse shapes are determined and pulses changed using an acousto-optic programmable dispersive filter to optimize fragment species or ratios between fragments. In this work we will compare different learning algorithms leading to process optimization as well as show some techniques of speeding up conversion to an optimal solution. We will show that in some cases optimization of a target function will not necessary be caused by a transform limited pulse, but can be some non-trivial solution. This implies the process is not directly correlated to the pulse energy density, but rather some other criteria. Future experiments will also be discussed which can lead to bond forming between different species as well as experimental processes occurring without the use of pre-ionization.

Award

Yes

Level

PhD

Supervisor

Dr A. du Plessis,anton2@sun.ac.za University of Stellenbosch

Paper

no

Place

Location: IT 4-5


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