Abstract
Continuing advances in photonic technology provide opportunities for low-cost, rugged diode-laser-based sensors for a variety of environmental and process applications. Tunable single-mode diode lasers are available for a range of wavelengths between about 630 nm and 1.55 μm. Used in conjunction with sensitive detection strategies, these lasers can probe vibrational or electronic transitions in a number of molecules relevant to many environmental or process flows, including O2, H2O, NO2, and CO2. The ability to record fully resolved transitions in absorption permits measurement of a broad range of parameters including density, velocity, and temperature. The measurements can often be made simultaneously and combined to deduce mass-flow or process-efficiency parameters.
© 1995 Optical Society of America
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