Electron microscopy
 
X-ray Acquisition Processing
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        


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X-ray acquisition processing is performed in three parts, including detector, electronic processor and multichannel analyzer display:
          i) An X-ray photon with a specific energy arrives the EDS detector;
          ii) A charge pulse is generated in the detector crystal. The charge pulse is proportional to the X-ray energy.
          iii) The generated charge pulse is converted to a voltage pulse.
          iv) The voltage pulse is passed to a pulse processor. The pulse processor removes noise from the signal, discriminates the energies of the incoming X-rays and discriminates between X-rays that arrive in the detector almost simultaneously.
          v) The voltage signal is amplified through a field effect transistor and isolated from other pulses, then identified electronically as resulting from an X-ray of specific energy.
          vi) A digital signal is stored in a channel assigned to that specific energy in the multi-channel analyzer.
          vii) A spectrum is generated in parallel with the full range of X-ray energies detected simultaneously.


 

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