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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

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Published on: August 1, 2017

Programmable smart electron emission controller for hot filament.

Eli Flaxer1

  • 1AFEKA-Tel-Aviv Academic College of Engineering, Tel-Aviv, Israel. flaxer@afeka.ac.il

The Review of Scientific Instruments
|March 3, 2011
PubMed
Summary
This summary is machine-generated.

A new digital circuit with a smart algorithm controls filament emission current in electron ionization sources. This system ensures fast response for stable ionization while protecting the filament from damage.

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Area of Science:

  • Analytical Chemistry
  • Instrumentation Science

Background:

  • Electron ionization sources rely on thermionic emission for electron generation.
  • Filament emission current is critical for controlling the ionization rate in these sources.
  • Maintaining stable emission current is essential, but filament protection from transients is also vital.

Purpose of the Study:

  • To develop a digital control circuit for regulating filament emission current in electron ionization sources.
  • To implement a control algorithm that balances fast response with filament protection.

Main Methods:

  • Development of a digital circuit utilizing a digital signal processing controller.
  • Implementation of a smart algorithm with adaptive response characteristics (fast for small signals, slow for large signals).
  • Integration of protective measures to prevent filament damage from current transients and overheating.

Main Results:

  • The developed digital circuit effectively regulates filament emission current.
  • The smart algorithm provides a fast response to maintain current stability.
  • Protective measures successfully prevent filament damage from excessive current and overheating.

Conclusions:

  • A novel digital control system enhances electron ionization source performance.
  • The adaptive algorithm ensures both stable ionization and filament longevity.
  • This approach offers a robust solution for managing critical parameters in electron ionization sources.