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Geiger photodiode array for compact, lightweight laser-induced breakdown spectroscopy instrumentation.

Richard A Myers1, Arieh M Karger, David W Hahn

  • 1Radiation Monitoring Devices, Inc., 44 Hunt Street, Watertown, Massachusetts 02472-4699, USA. rmyers@rmdinc.com

Applied Optics
|November 5, 2003
PubMed
Summary

A novel spectrometer using Geiger photodiodes improves laser-induced breakdown spectroscopy (LIBS). This compact detector offers high sensitivity for standoff analysis, detecting single photons without complex electronics.

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Area of Science:

  • Spectroscopy
  • Photonics
  • Instrumentation Engineering

Background:

  • Laser-induced breakdown spectroscopy (LIBS) is a powerful analytical technique.
  • Traditional LIBS instrumentation can be complex and require specialized components.
  • Enhancing detector performance is crucial for improving LIBS capabilities, particularly for standoff applications.

Purpose of the Study:

  • To develop and evaluate a unique spectrometer utilizing an array of Geiger photodiodes.
  • To assess the performance enhancements offered by this new detector technology for LIBS instrumentation.
  • To determine the suitability of these detectors for standoff LIBS analysis.

Main Methods:

  • Development of a spectrometer based on an array of Geiger photodiodes.

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  • Characterization of detector performance, including dark-count rates and spectral response.
  • Integration and testing of the detector within a LIBS system for performance evaluation.

    • Main Results:

    • The Geiger photodiode array spectrometer enhances LIBS instrumentation performance.
    • Detectors are compact, silicon-based, and enable single-photon detection at room temperature.
    • Low dark-count rates (<500 Hz) and broad spectral response (UV to near-IR) were achieved.
    • Elimination of postamplification electronics and complex gating circuitry was demonstrated.

    Conclusions:

    • The developed Geiger photodiode array spectrometer offers significant advantages for LIBS.
    • Its high sensitivity and compact design make it ideal for standoff analysis.
    • This technology represents a promising advancement for LIBS spectrum analyzers.