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- W2014043774 abstract "Although mid infrared research into sources and detectors has made considerable progress in recent years, requirements for gas sensing purposes for source power and the detectivity of diode detectors - particularly in combination - remain to be convincingly demonstrated in an industrial context. Published results are often confusing in that they apply to a variety of pulse lengths and duty cycles. We suggest a standardized approach in terms of an averaged cw power output. Parameters such as radiance, drive current and electrical power are also important. We discuss the relative merits of lasers and LEDs, i.e. use of line or band absorption on gas sensing. We report recent advances in the use of immersion optics leading to detectors with D*~5x10<SUP>9</SUP> cmHz<SUP>1/2</SUP>W<SUP>-1</SUP> at 5.4micrometers , LEDs with outputs improved by a factor of 5 and an LED/Diode/White cell gas sensing demonstration giving 2ppm sensitivity for NO<SUB>2</SUB> with an electrical power requirement of only 0.25mW. Further consideration includes sensitivity of gas sensing, path length and volume, time constant and temperature stability. Latest results are assessed on the basis of the above and combined with some market indications." @default.
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- W2014043774 date "2002-05-24" @default.
- W2014043774 modified "2023-09-26" @default.
- W2014043774 title "Recent developments in the applications of mid-infrared lasers, LEDs, and other solid state sources to gas detection" @default.
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- W2014043774 doi "https://doi.org/10.1117/12.467944" @default.
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