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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.
  • Laser Transient Absorption Spectroscopy
    The customer's setup is a scientific application in which transient signals from a Laser Absorption Spectroscope are transferred to a computer. The laser power is modified in steps and the process is repeated. The measurement sensitivity is limited by noise generated by the current digitizer.
  • Rubidium Absorption Spectroscopy
    Ultra-high resolution laser spectroscopy of the rubidium. atom at 780 nm has numerous applications in sensing,. metrology, and aerospace. Despite these opportunities,. commercial product development has been hindered by. unstable sources of supply of precision, reliable. semiconductor lasers
  • 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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