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  • Trace HCl Measurements in Coal-fired Power Plant Emissions Using Cavity Enhanced Laser Absorption Spectroscopy
    New EPA regulations are requiring hydrogen chloride (HCI) emissions to be monitored in concentrations below 1 ppm for power plants and 3 ppm for cement plants. The properties of HCI, its reaction to other elements and sensitivity to temperature make meeting the measurement requirements challenging.
  • AQ6375 Optical Spectrum Analyzer for Long Wavelength Band
    dioxide). In order to small concentrations of these gas molecules with high sensitivity, laser absorption spectroscopy technology is gaining attention and is under active development.
  • MICRO: Critical Materials
    processing techniques. Dual-cell near-infrared absorption spectroscopy using a tunable diode laser over a narrow spectral bandwidth is another method for detecting trace spectroscopic levels of moisture in ammonia. This article describes the design and operation of a novel IR spectroscopic instrument
  • MICRO: Ultraure Gases - McAndrew (Feb 2000)
    by the manufacturing community and are compatible with reactive process gases and atmospheres. This article describes tunable diode laser absorption spectroscopy (TDLAS), a technique developed by Air Liquide (Paris, France/Chicago) for measuring moisture in process gases. This technique meets
  • Photodiode Characteristics and Applications (.pdf)
    Silicon photodiodes are semiconductor devices responsive to high-energy particles and photons. Photodiodes operate by absorption of photons or charged particles and generate a flow of current in an external circuit, proportional to the incident power. Photodiodes can be used to detect the presence

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