High speed camera @ ALPS

Spatial and temporal analysis of emission in pulsed RF glow discharge with iCCD camera


Plasma engineering needs fast and efficient spectroscopic analysis methods. At ALPS, an iCCD camera, provided with optical bandpass filters, is used for spatial and temporal characterization of plasma compostition.


The goal of the project is to put in place a set-up to characterize the aspect and composition of the plasma at ignition and extinction. In order to ensure this, pulsed radiofrequency glow discharges are synchronized with image acquisition.


First step of the project was to determine the parameters and the modes of the iCCD camera (4 Picos analog video camera, Standford Computers Optics). An intern user manual has been written to make easier the standard image acquisition. Next, the iCCD camera has been intergrated to a set-up which allows the synchronisation of a pulsed GD with the picture acquisition. To do that, an external trigger is generated by a function generator and transmitted both to the camera and the plasma generator.


As a first test and proof of operation, an emission of a LED, driven by a sinusoidal voltage, was recorded with varying temporal resolution. Equivalent time windows of consequitive cycles are integrated on chip and / or software to improve and test the signal to noise ratio.





Finally, to be able to follow the plasma ignition and extinction, a Labview application is currently being developed to automate and optimise the use of the camera in this experience.